JP6915808B2 - Multi-point simultaneous measurement system - Google Patents

Description

In the present invention, measurement sensors such as vibration sensors, load sensors, displacement sensors, etc. are arranged at a plurality of locations within a few meters to 2 km of structures such as bridges, mechanical devices, structures, roads, trains, and tunnels, and the same measurement is performed. By simultaneously measuring with a sensor and obtaining multipoint data of the structure at the same time, it is possible to accurately measure and inspect the vibration, load, crack, and deformation displacement of the structure, and the structure deteriorates, durability deteriorates, breaks, and breaks. It relates to a multi-point simultaneous measurement system for accurately measuring the fear of. In particular, it is a multi-point simultaneous measurement system using wireless / optical or ultrasonic waves that can obtain accurate measurement data synchronized at the same time from measurement sensors at a plurality of positions.

In the conventional wireless sensor device system for measuring the vibration phenomenon of a mechanical device or structure, a mode analysis method is used to measure the rigidity of the mechanical device or structure, but this method is used for a plurality of objects. This can be achieved by installing multiple wired vibration sensors and measuring at the same time. However, when the wired sensor device is attached, there are problems that the wiring becomes an obstacle and the place where the sensor is attached is limited, or the sensor cannot be attached.
If the vibration sensor data is transmitted by analog radio, the wireless vibration sensor is effective for attaching the vibration sensor to any location, but the measurement accuracy deteriorates because the analog radio signal is easily affected by noise. There is a problem. When digital wireless communication is used, it is not easily affected by noise, but even if a simultaneous measurement start signal is transmitted by digital communication, the processing time of the digital processing circuit of the received radio wave in each measuring device is short. Since there are variations, it is not possible to accurately set the measurement start time of each measuring device to the same time, a time lag occurs, and there is a problem that the measured value data of each measuring device at the same time cannot be acquired.
In order to solve this problem, an invention has been made in which time synchronization is performed by a signal from GPS capable of accurate time measurement, but this method cannot be used in a place where GPS radio waves do not reach.

As this type of measurement system, the invention of "synchronous recording system and synchronous recording method" described in Patent Document 1 is known. However, in the present invention, there is also an invention in which vibration is applied to an object for synchronization and synchronization is performed by measuring the waveform of the applied vibration, but for synchronizing with the vibration waveform of the object to be measured. There is a drawback that the vibration waveform needs to be separated, which makes data processing difficult.
Further, "time synchronization method, vibration sensor, vibration detection device, program and recording medium" described in Patent Document 2 (Japanese Patent Application No. 2015-225780) is also known.
Since GPS information is used in the present invention, there is a problem that it cannot be adopted for measurement at a position where GPS reception is difficult.

Japanese Unexamined Patent Publication No. 2010-281771 JP-A-2017-96651

The problem to be solved by the present invention is to solve the conventional problems, and to solve the conventional problems, and to solve the problems of the same time of a plurality of measuring devices arranged so as to have different measurement positions in a place where GPS is not used or GPS information cannot be used. The purpose is to provide a multi-point simultaneous measurement system that can acquire digital measurement values.

The configuration of the present invention that solves this problem is
1) The measurement value of the measurement sensor is sampled at a fixed time interval of the built-in clock or the data sampling clock of a predetermined frequency, the measurement value of the measurement sensor is converted into a digital value, and the measurement value is associated with the clock number of the data sampling clock. Digitally modulates the original information of the clock numbers of a plurality of measuring devices using a computer stored in the memory as the original information and arranging the measuring sensors at different positions, the measured values of each measuring device, and the corresponding data sampling clock. The modified clock number value is obtained by subtracting the predetermined clock number value from the value of the data sampling clock of the original information so that the clock numbers at the start of measurement of each measuring device match when received and input by radio waves. An analyzer that uses a computer that has a modification program that associates the value with the modified clock number and stores it as authentic information, and an analog that simultaneously transmits a measurement start signal to each measurement device using analog-modulated radio waves. Consists of a modulated radio transmitter
Each measuring device and analysis device is assigned an ID number of the measuring device ID and the measurement number ID so that the measuring device and the measurement number can be separated by a digital method, and the digital value of the measured value of the original information and the corresponding clock. It is equipped with a digitally modulated radio transmitter, a digitally modulated radio receiver, a digital demodulator and a digital modulator for transmitting and receiving numbers and necessary control signals and data by radio waves, and the measuring device is an analog that receives the analog modulated radio waves. The modulated radio wave receiver, the analog demodulator that extracts the measurement start signal from the tuning signal of the analog modulated radio wave receiver, and the measurement start signal output by the analog demodulator of the corresponding sampling clock at the measurement start time of the measuring device. It is equipped with measurement software that stores the digital value of the clock number and the measurement value of the subsequent measurement sensor and the clock number of the sampling clock as original information in the memory.
The analysis device has a GPS device or a built-in clock and can generate accurate time data, and digitally modulated radio waves from each measuring device the clock number of the data sampling clock stored therein and the original information of the corresponding measured value. When it is received by, the multi-point simultaneous measurement system that executes the above-mentioned modification program that performs the following processing and calculates the measured value at the same time in each measuring device.
Note: The data of the measurement sensor with the same measurement device ID and the same measurement number ID received by the digitally modulated radio waves from each measurement device, and the data of the original information of the measurement value associated with the clock number of the data sampling clock is analyzed by the analysis device. Stored as original information data in the main memory
Next, the clock number of the corresponding data sampling clock at the measurement start time of each measuring device is set as the start clock number from the original information data of the main memory, and then the start is started from the clock number of each data sampling clock of the original information of each measuring device. The clock number value is subtracted to obtain the modified clock number value, and the measured value corresponding to the clock number of the data sampling clock of the original information data of the main memory is associated with the modified clock number and stored in the main memory as genuine information. Correction program that calculates the corresponding measurement value of the same correction clock number in the memory as the authentic measurement value of each measuring device at the same time 2) The measurement value of the measurement sensor is fixed to the built-in clock or the data sampling clock of the predetermined frequency The measurement sensor is stored at a different position using a computer that samples at the time interval of the above, converts the measurement value of the measurement sensor into a digital value, associates it with the clock number of the data sampling clock, and stores it in the memory as original information. When the original information of the arranged multiple measuring devices, the measured value of each measuring device and the clock number of the corresponding data sampling clock is received and input by digitally modulated radio waves, the clock numbers at the start of measurement of each measuring device match. It has a correction program in which the value of the predetermined clock number is subtracted from the value of the clock number of the data sampling clock of the original information, and the measured value is associated with the corrected correction clock number and stored as genuine information. It consists of an analyzer using a computer and a floodlight or illuminator that simultaneously projects an optical signal indicating a measurement start signal to each measurement device.
Each measuring device and analysis device is assigned an ID number of the measuring device ID and the measuring number ID so that the measuring device and the measuring number can be separated from each other, and the digital value of the measured value of the original information and the corresponding clock are digitally used. It is equipped with a digitally modulated radio wave transmitter, a digitally modulated radio wave receiver, a digital demodulator and a digital modulator for transmitting and receiving a number and necessary control signals and data by radio waves, and the measuring device is the said from the floodlight or the illuminator. A receiver that outputs a measurement start signal when an optical signal is received, and a digital value of the clock number of the corresponding sampling clock at the start of measurement of the measuring device and the measurement value of the subsequent measurement sensor with the measurement start signal output by the receiver. And the measurement start software that stores the clock number of the sampling clock as the original information in the memory.
The analysis device has a GPS device or a built-in clock and can generate accurate time data, and digitally modulated radio waves from each measuring device the clock number of the data sampling clock stored therein and the original information of the corresponding measured value. When it is received by, the multi-point simultaneous measurement system that executes the above-mentioned modification program that performs the following processing and calculates the measured value at the same time in each measuring device.
Note: The data of the measurement sensor with the same measurement device ID and the same measurement number ID received by the digitally modulated radio waves from each measurement device, and the data of the original information of the measurement value associated with the clock number of the data sampling clock is analyzed by the analysis device. Stored as original information data in the main memory
Next, the clock number of the corresponding data sampling clock at the measurement start time of each measuring device is used as the start clock number from the original information data of the main memory, and then the start clock number value is subtracted from each clock number of the original information of the measuring device. The modified clock number value is used, and the measured value corresponding to the data sampling clock clock number of the original information data of the main memory is associated with the modified clock number and stored in the main memory as genuine information, and the same modification of the main memory is performed. Modification program that calculates the measured value corresponding to the clock number as the authentic measured value of each measuring device at the same time 3) Samples the measured value of the measurement sensor at a fixed time interval of the built-in clock or the data sampling clock of the predetermined frequency. A plurality of measuring devices using a computer that converts the measured value of the measuring sensor into a digital value, associates it with the clock number of the data sampling clock, and stores it as original information, and arranges the measuring sensor at different positions. When the original information of the measured value of each measuring device and the clock number of the corresponding data sampling clock is received and input by the digitally modulated radio wave, the measured value of the received original information of each measuring device and its data sampling clock The clock number of the original information is associated with the measuring device ID and the measuring number ID and written as the original information in the main memory, and the clock number of the original information is super-due to the distance difference between each ultrasonic receiver and the ultrasonic transmitter. Considering the difference in sound transmission time as the number of clocks, the corresponding clock number of the measured value is corrected so that the clock number of each measuring device at the start of measurement of ultrasonic transmission is the same, and the corrected clock indicating the same time. From an analyzer using a computer that has a modification program that associates with the measured value as a number and stores it as authentic information in the main memory, and an ultrasonic transmitter that simultaneously transmits the ultrasonic waves of the measurement start signal to each measuring device. Naru,
Each measuring device and analysis device is assigned an ID number of the measuring device ID and the measuring number ID so that the measuring device and the measuring number can be separated from each other, and the digital value of the measured value of the original information and its corresponding data sampling are performed by a digital method. It is equipped with a digitally modulated radio wave transmitter, a digitally modulated radio wave receiver, a digital demodulator and a digital modulator for transmitting and receiving the clock number of the clock and necessary control signals and data by radio waves, and the measuring device further transmits the ultrasonic signal. An ultrasonic receiver that outputs a measurement start signal when it is received, and a digital measurement start signal output by the same ultrasonic receiver that corresponds to the sampling clock clock number at the start of measurement of the measuring device and the measurement value of the subsequent measurement sensor. Equipped with measurement start software that stores the value and the clock number of the sampling clock as original information in the memory.
The analyzer has a GPS device or a built-in clock and can generate accurate time data, and the arrival time of ultrasonic reception depending on the distance between the ultrasonic transmitter at a predetermined position and the ultrasonic receiver of each measuring device. The time of When the original information of the clock number and the corresponding measured value is received by the digitally modulated radio wave, the above-mentioned modification program that performs the following processing is executed to calculate the measured value at the same time in each measuring device at the same time. Measurement system
Note: The data of the measurement sensor with the same measurement device ID and the same measurement number ID received by the digitally modulated radio waves from each measurement device, and the data of the original information of the measurement value associated with the clock number of the data sampling clock is analyzed by the analysis device. Stored as original information data in the main memory
Next, the start clock number of the corresponding data sampling clock number at the measurement start time of each measuring device is obtained from the original information data of the main memory, and then the start clock number value is obtained from each data sampling clock number of the original information of each measuring device. Is subtracted, and the correction clock number calculated by further adding the number of position correction clocks is obtained, and the measurement value corresponding to the clock number of the data of the original information stored in the measuring device ID is associated with the correction clock number value. The correction program 4) sends a measurement start signal by storing it as genuine information in the main memory and calculating the corresponding measurement value of the same correction clock number in the main memory as the genuine measurement value of each measuring device at the same time. The multi-point simultaneous measurement system described in 1) above, in which an analog-modulated radio transmitter is incorporated as an accessory device that can be controlled from the analysis device. The multipoint simultaneous measurement system described in 2) above, which was incorporated as an accessory device that can be opened and closed by wire or wirelessly, 6) Each measuring device was arranged so as to be within a range of 3 km, 1) above. Or 2) The multipoint simultaneous measurement system described 7) An ultrasonic transmitter is installed near each measuring device, and the ultrasonic transmitter enables ON / OFF of its operation by analog wireless or wired operation. ) Multi-point simultaneous measurement system 8) The multi-point simultaneous measurement system described in 3) above, in which each measuring device is arranged so as to be within a range of 10 m. It is in the multipoint simultaneous measurement system according to any one of 1) to 8) above, which is a vibration sensor for measuring the vibration of the above.

In the present invention, since a digital wireless transmission / reception circuit is provided between the analysis device and each measurement device, the digital measurement value of the sensor, the data sampling clock number, the data sampling frequency information, the measurement start preparation signal, and the measurement start preparation signal are provided. Information to be transmitted such as measurement device ID, measurement number ID, measurement time, measurement device setting initial value, and measurement software can be transmitted and received digitally by radio waves, and various information can be transmitted accurately with less noise. Moreover, since both devices are equipped with a computer having a CPU and a memory, it is possible to digitally transmit necessary data information, process computer software, and store the data in the memory.
In addition, in the inventions of claims 1 and 2, the simultaneous transmission of the measurement start signal (command) to each measuring device is performed by analog wireless communication or optical communication. Therefore, since the propagation speed of light and electromagnetic waves is extremely fast, if each measuring device is arranged so as to be within a range of several kilometers, it can be said that signals arrive at each measuring device at the same time. Moreover, in the electronic circuit of the analog wireless receiver or receiver, there is almost no time difference between the time when each measuring device receives and receives the signal and the time when the measurement start signal (command) is output to the device circuit. It can be said that the measurement start signal from the analog modulated radio wave transmitter or the floodlight / illuminator that simultaneously transmits by light is output to each measuring device at the same time. For each data sampling clock, the clock number and the measurement digital value of the measurement sensor are associated with the clock number and stored in the memory as original information.
Then, the measurement digital value stored in the memory of each measurement device and the original information of the clock number are measured by the analysis device by digital wireless communication, transmitted and received, and the measurement device ID / measurement is stored in the main memory of the analysis device. It is sorted by number ID and stored as original information in the main memory.

Next, when the software of the modification program of the analyzer is activated, the first clock number at the start of measurement in each measuring device is set as the start clock number, and the start clock number is subtracted from the clock number of the original information stored in the main memory. The correction clock number of an integer starting from zero is calculated, and the measurement digital value corresponding to the clock number of the original information is associated with the above correction clock number and stored in the main memory as genuine information.
The first correction clock number of each measuring device may be a specific numerical value instead of a zero value, but it is preferable to set the measurement start time point to zero because it is easy to understand.

The data sampling clock of each measuring device has the same clock frequency at a predetermined frequency, and the clock frequency can be generated with high accuracy at present. In addition, if the measurement time is at the second / minute level, the time interval of one clock is It can be said that it is an accurate time interval, and when the measurement start signal of each measuring device operates at the same time and the correction clock number is also started from zero, the same correction clock number indicates the time from the start of measurement, and the corresponding The measured (digital) value of the main memory becomes the measured value of each measuring device at the same time. By multiplying the modified clock number by the time interval of one clock, it can be immediately converted to the elapsed time t.

In this way, the same modified clock value (which can be converted into time / time) of each measuring device having the same measurement number ID in the main memory of the analysis device becomes the measured value of each measuring device at the same time.
In this way, it is possible to obtain the measured values of the measurement sensors of a plurality of measuring devices at the same time, which enables accurate inspection and analysis of the structure of the object to be measured.

When a measurement start signal (command) is transmitted by ultrasonic waves of 20 KHz or higher, the propagation speed of the ultrasonic waves is much slower than that of electromagnetic waves and light, so the signal is received by the ultrasonic receiver of each measuring device. Since the time to be set varies considerably depending on the arrangement position, the arrival time from the position of the ultrasonic transmitter to the reception by the ultrasonic receiver of each measuring device is measured in advance using the built-in clock or GPS time, or during that time. Calculate from the distance of, and further calculate the number of correction clocks to be added to correct the sound velocity at the time of measurement by temperature T to make it the same time, and from the clock number (number value) of the sampling clock of the original information at the start of measurement The number of clocks is subtracted, the number of correction clocks is further added, and the correction clock number is associated with the new correction clock number, which is stored in the main memory as genuine information. Make sure that the same modified clock number in the main memory is the measured value at the same time.

When the measurement start signal is transmitted by a medium of radio waves or light, the error of the arrival time of the measurement start signal depending on the position in the measuring device within a range of 2 to 3 km is negligible in normal measurement. When the measurement start signal is transmitted by the ultrasonic medium, the error of the arrival time depending on the position can be reduced by correcting the error of the arrival time depending on the position by the number of position correction clocks in addition to the number of start clocks if the measurement start signal is within 10 m.

FIG. 1 is an explanatory diagram showing a basic configuration of the present invention, a measurement start signal, and an analog value state of the measured value. FIG. 2 is an explanatory diagram showing an arrangement of each measuring device, an analysis device, and an analog radio wave transmitter according to the first embodiment of the present invention. FIG. 3 is a circuit block diagram of the measuring device of the first embodiment. FIG. 4 is a circuit block diagram of the analysis device of the first embodiment. FIG. 5 is an explanatory diagram showing a memory structure of the memory in the measuring device of the first embodiment. FIG. 6 is an explanatory diagram showing the structure of the main memory of the analysis device of the first embodiment. FIG. 7 is a flowchart of the measurement software of the measuring device computer according to the first embodiment. FIG. 8 is a flowchart showing a procedure for measuring the computer of the analysis device, measuring radio wave transmission / reception, transmitting / receiving radio waves, and correcting the clock number of the data sampling clock in the first embodiment. FIG. 9 is an explanatory diagram of the device of the second embodiment that transmits a measurement start signal using light. FIG. 10 is an explanatory diagram of a circuit block of the measuring device of the second embodiment. FIG. 11 is an explanatory diagram of the device of the third embodiment for transmitting a measurement start signal using ultrasonic waves. FIG. 12 is an explanatory diagram of a circuit block of the measuring device of the third embodiment. FIG. 13 is an explanatory diagram showing a pulse waveform of an M-sequence signal used as a measurement start signal for modulating an analog radio wave.

In the invention in which the measurement start signal is transmitted by an analog modulated radio wave or an optical medium, the arrangement range in which each of the plurality of measuring devices is installed in the present invention is the distance of the arrangement position as compared with the propagation speed (light / radio wave speed) of these media. If the range L of is within several km, the difference in arrival time is usually negligible. Specifically, L << (c / f) is established. Here, c = speed of light and f = clock frequency are shown. When the data sampling clock frequency f is high, the distance of the arrangement range is shortened. When the time change of the measured value is large, the data sampling clock frequency f is set higher.

Further, it is preferable that each measuring device has the same electric circuit because the delay due to the circuit of the device can be the same. Further, the measurement start signal may be an M-sequence signal shown in FIG. 11 instead of a single pulse.

Since it takes several seconds to a dozen seconds for each measuring device to become stable in advance so that it can operate immediately after receiving the measurement start signal, it is activated and stable before sending the measurement start signal to each measuring device. In order to enter the state (standby state), it is preferable to transmit the operation preparation signal and the initial setting value or the measurement setting value first by a digital signal so that the computer software / electronic circuit can operate immediately at the set value. This also serves as an energy-saving measure for each device during non-measurement hours.

When ultrasonic waves are used as a medium for the measurement start signal of the measuring device, the arrival time difference due to the difference in the distance between the ultrasonic transmitter and each measuring device is measured in advance, and the number of correction clocks of the data sampling clock is calculated in advance. Calculate it. Since the delay changes depending on the atmospheric temperature of the measurement site as needed, it is preferable to enable the analyzer to calculate the exact number of correction clocks in consideration of the measurement temperature.

The method of using light as a transmission medium for the measurement start signal is to allow the same light source (plane floodlight (illuminator)) or a floodlight that emits light toward the receiver to emit light at the same time, and the receivers reach at the same time. Arrange as you can.

(Example 1)
Example 1 shown in FIGS. 1 to 8 is an example in which a measurement start signal is transmitted by an analog modulated radio wave, the object to be measured is a large bridge, an example of a device for measuring the vibration, and the measurement sensor is a vibration sensor. Vibration sensors (measuring devices) are attached to 4 and 5 points of the bridge structure in the 2km range of 2 groups on the left and right of the large bridge, and the frequency of the data sampling clock is 1KHz. An analog modulated radio wave transmitter that emits modulated radio waves is attached so that analog modulated radio waves can be transmitted by operating the analyzer.

(Explanation of code)
G ₁ is the multi-point simultaneous measurement system of Example 1 of the present invention, BR is a large bridge to be measured to which a measurement sensor (measurement device) is attached, K ₁₁ , K ₁₂ , K ₁₃ , K ₁₄ , K ₁₅ , K. ₁₆ , K ₁₇ , K ₁₈ , and K ₁₉ are measuring devices of the same circuit installed on the same large bridge, KCOM is the _{computer used for each measuring device K 1i} (i = 1 to 9 or less), and the CPU is the same computer. centralized processing units of KCOM, KINT the same computer KCOM interface, KDS is digital modulation radio transmitter of each measuring device _{K 1i,} KDR is digital modulation radio receiver of the measuring device _{K 1i,} KDH digital modulation radio transmitter KDS The digital modulator in the previous stage, KDI is the digital signal input unit to the digital radio wave modulator KDH, KDRF is the digital demodulator of the digital radio wave modulation receiver KDR, KDRO is the digital signal output unit from the digital demodulator KDRF, and KAR is each. analog modulation radio receiver of the measuring device _{K 1i,} KARF the analog radio demodulator, KARO analog signal output section, ANT is a radio transmitting and receiving antenna.

SES is a measurement sensor that uses a vibration sensor that measures the vibration of bridge members, AD is an A / D converter that converts analog measurement data of the measurement sensor SES into digital measurement data, and SAC is data sampling that generates a data sampling clock. It is a clock generation circuit, and its clock frequency can be set by the computer KCOM. KCC is a clock counter that counts the number of clocks output by the data sampling clock generation circuit SAC, and outputs the number of clocks of the original information. KSW is normally open clock switch that determines whether to apply the output clock of the data sampling clock generating circuit SAC in the A / D converter AD and the clock counter KCC, KME the memory of the measuring device _{K 1i,} KMEK the same memory Basic software that stores basic software (OS, measurement software, radio communication procedure, etc.) in KME Memory unit, KMED is the clock output by the clock counter KCC with the clock number of the digital measurement value and the original information of the data sampling clock. Number (clock number value), measurement device ID, measurement number ID, GPS time data when the measurement start signal of analog modulated radio waves is transmitted from the analysis device, measurement location BR, atmospheric temperature at the location where the measurement device is installed, etc. It is a data memory unit to store.

MK is the analysis device of the first embodiment, MCOM is the computer of the analysis device MK, MCPU is the CPU of the computer MCOM, MINT is the interface of the computer MCOM, MME is the main memory of the computer MCOM of the analysis device MK, and MDS is the digitally modulated radio wave transmitter. , MDR is a digitally modulated radio receiver, MDH is a digital modulator, MDI is a digital signal input to the digital modulator MDH, MDRF is a digital demodulator, MDRO is a digital signal output from the digital demodulator MDRF, and MAS is a measurement. An analog-modulated radio transmitter that transmits a start signal as an analog-modulated radio wave, MASF is an analog modulator of a measurement start signal, and MAB is a measurement start button that generates a measurement start signal. MANT is a radio antenna of the analysis device MK, and MASI is a measurement start signal input unit.

MMEK is a basic software memory unit that stores the OS of the computer MCOM, communication procedure software for analog / digital radio waves, correction programs, etc., and MMED is a data memory unit that stores measurement data. Digital original information measurement value, measurement time t, clock number of the original information, clock number at the start of measurement, correction clock number (correction clock number obtained by subtracting the start clock number at the start of measurement from the clock number of the original information) ), GPS time at the start of measurement, elapsed time t from the start of measurement, t = Δt (clock cycle Δt) * modified clock number, model of measurement sensor, installation location of measurement sensor, atmospheric temperature at start of measurement, etc. I remember.

MDIS is a computer MCOM display, MKB is a computer MCOM input keyboard and mouse, and MHD is a computer MCOM external hard disk.

(Measurement procedure)
_{First, each measuring device K 1i} (i = 1 to 9) is installed in both the left and right ranges within a range of 2 km on the large bridge BR (see FIG. 2).
When the time to be measured is determined, a few minutes before that time, the analysis device MK first measures the measurement preparation command and set value information (clock frequency fHz, measurement time 20 sec, measurement number ID, etc.) from the digital radio wave transmitter MDS. It is transmitted to the device K _1i (i = 1 to 9).
The measuring device K _1i digital radio of the measurement preparation instruction is received by the digital modulation radio receiver KDR, and demodulated by digital demodulator KDRF, the output signal of these information from the digital signal output unit KDRO, computer KCOM, The main power is supplied to the A / D converter AD, the measurement sensor SES, the clock generation circuit SAC, the start circuit, etc., and the device is put into the standby state. At the same time, the memory such as the clock frequency f, the measurement time t, and the GPS measurement preparation start time is written, and the software data is written.

After that, when the measurement start button MAB of the analog radio wave transmitter MAS attached to the analyzer MK is pressed, a single pulse is generated by the measurement start signal input unit MASI, input to the analog modulator MASF, and the analog radio wave transmitter MAS. Transmits analog-modulated radio waves of a specific frequency.

The analog modulation wave is propagated in the light substantially the same speed, is received by the analog modulation radio receiver KAR of each measurement device K _1i, it is demodulated by the analog radio demodulator KARF, measured by the analog signal output section KARO A single pulse of the start signal is output digitally. The output signal of the analog signal output section KARO is applied to the normally open clock switch KSW measuring device K _1i, a clock signal of the clock generating circuit SAC is closed and the clock switch KSW A / D converter AD The analog signal of the measurement sensor SES is input to the A / D converter AD, and the measurement value of the measurement sensor SES is output as a digital value at the timing of clock application, and is input to the computer KCOM via the interface KINT. Will be done. Further, the same clock signal is input to the clock counter KCC, and the number of clock counters is written as the number of clocks (number) as the original information by the computer KCOM via the interface KINT in synchronization with the clock. The state of the memory of the measuring device _{K1i is shown in FIG.}
Thus, it measured digital values for each clock and its number of clocks (number) data memory section KMED the measurement device ID of the measuring device K _1i, are stored in association with the measurement number ID. This memory state is shown in FIG. Each measuring device K _1i of the memory KME measured digital values for each clock and the clock number at that time (number) is stored as the original information, past the 20sec measurement time t, and stops the clock generating circuit SAC.

After the measurement time has elapsed, the digital data of the original information in the memory KME is transmitted from the digital modulation transmitter KDS to the analysis device MK by digital modulation radio waves.
The analyzer MK receives it with the digitally modulated radio wave receiver MDR, the original information is output from the digital demodulator MDRF / digital signal output unit MDRO, processed by the computer MCOM via the interface MINT, and the original information data is stored in the main memory MME. Written as.

Point like measurements of the measuring device K _1i (digital value) and its number of clocks (number) and stored in the main memory MME as original information, the measurement starting point in accordance with software computer MCOM, i.e. the clock switch KSW has been closed Is considered to be the same time in _{each measuring device K1i because} of analog modulation and because the measuring range is as narrow as about 2 km.

The clock switch KSW is closed and the clock counter KCC is activated, and the first clock number (number) C0 is "1" (the initial value is zero).
Therefore, the time when the number of clocks (number) C0 becomes "1" is the measurement start time, which is the same time for _{each measuring device K1i.} That is, the start clock number value CN ₁ is "1".

By subtracting the start clock number value CN 1 _{= 1} of the measurement start signal arrival time from the clock number C0 value of the original information of the correspondence between measured values by modifying software analyzer MK, modified clock numeric C1 (0, 1, 2, 3, ...).
C1 = C0-CN ₁ = C0-1.
This modified clock numerical value C1 is associated with the genuine information of the measured (digital) value of the original information and written to the main memory as the (corresponding) modified clock number (number) C1. Further, the elapsed time tj from the time of the measurement start signal is calculated as tj = Δt * modified clock number C1 and written in the main memory MME in association with the measured value.
The memory state of this modified clock number is shown in FIG.

In this state of the main memory _{, the same correction clock number (number) C1 is set to the same time in each measuring device K1i} , and the measured value of the corresponding original information is the digital value of each measuring sensor.

In this way, since the digital values of the same time (same correction clock number) of each measurement sensor having different mounting positions of the large bridge BR can be obtained, the measured values of the same time of each position of the large bridge BR can be obtained. Therefore, the vibration analysis of a large bridge can be performed accurately.

As described above, in the present invention, by obtaining the same time data of the measured values of a plurality of measuring sensors located from several km to several tens of meters, the measurement and analysis of vibration, load, crack, etc. of the object to be measured can be accurately performed. can do.
In addition, by saving data for each measurement date, problems such as aging and cracks can be accurately inspected. An example of the above procedure flow is shown in the flowcharts of FIGS. 7 and 8.

(Example 2)
“Light” is used as the transmission medium of the measurement start signal of the second embodiment shown in FIGS. The receiver LR that senses the light of It is applied to the converter AD, clock counter KCC, etc. Instead of the analog modulated radio wave and its transmitter / receiver for the measurement start signal of the first embodiment, the lighting device SL or a plurality of floodlights are turned on / off by wire or analog radio, and the light receiver LR of each measuring device is turned on / off. The measurement open signal is made to arrive at the same time. Others are the same as the circuit device configuration of the first embodiment. FIG. 10 shows an explanatory diagram of the circuit block diagram of the second embodiment.

Then, the storage of the data sampled from the measurement sensor SES in the memory, the transmission / reception of the data to the analysis device, the modification of the memory structure and the clock number are the same as those in the first embodiment, and thus are omitted.

In the second embodiment, it is necessary to devise so that sunlight, car headlamps, and street lamps do not enter the receiver. Therefore, it is suitable for use in a specific place indoors or in a factory.

(Example 3)
Example 3 shown in FIGS. 11 and 12 is an example in which the transmission medium of the measurement start signal and ultrasonic waves are used. Since the propagation speed of ultrasonic waves is much slower than that of radio waves and light, a measuring device and an ultrasonic transmitter are used. Is mainly used when simultaneous arrival of measurement start signals in a narrow range of 10 m or less. In addition, it is not suitable for places with high frequency noise, and is suitable for indoor / factory measurement with relatively low noise. In addition, the measurement clock cycle is long, and it is suitable for long-term measurement.

In this Example 3, since ultrasonic waves are used as the propagation medium of the measurement start signal of the first embodiment, ultrasonic waves of a specific frequency are generated instead of the MAS, KAR, and MASF of the analog radio wave transmitter / receiver of the first embodiment. provided an ultrasonic transmitter SSH to the analyzer MK, also KAR analog radio receiver to each measuring device _{K 1i,} instead KARF, the circuit of KARO, the ultrasonic receiver SSR provided, the ultrasonic receiver in SSR The received signal closes the circuit with the clock switch KSW, and other structures and effects are the same flow and procedure as in the first embodiment, and thus are omitted.

In the third embodiment, each measuring device is also provided with a temperature sensor at the position where the device is installed, and information on the measured temperature Ti is also transmitted to the analysis device MK by digitally modulated radio waves, and the measuring device ID and measurement are performed in the main memory MME. It is stored in association with the number ID.
In each measuring device, when the ultrasonic receiver SSR receives the measurement start signal as in the first embodiment, the measured data value and the clock number are associated with the clock number at this time and stored as the original information in the memory KME. Then, the original information of the memory KME of the measuring device is transmitted to the analysis device MK by digitally modulated radio waves, and when received, it is associated with the measuring device ID and the measuring number ID in the main memory MME and stored.

として（但し、Ｍは空気分子量，Ｋは空気の比熱比，Ｒは気体定数）、温度補正を行った位置補正クロック数を算出し加算して（原情報のクロック数−開始クロック数−温度補正した位置補正クロック数）で調整した修正クロック数を算出し、原情報の計測デジタル値と修正クロック数とを関連付けして主メモリＭＭＥに記憶する。 In the modification program of the analyzer, the clock number (number) of the original information of each measuring device is first subtracted from the start clock number of the clock number at the start of measurement. Further, the number of position correction clocks according to the arrival time difference according to the distance between the ultrasonic receiver SSR and the ultrasonic transmitter SSH of each measuring device, the temperature T of the measured value, and the atmospheric temperature Ti from each measuring device are obtained. Calculated as the absolute temperature T of the average value of

(However, M is the air molecular weight, K is the specific heat ratio of air, R is the gas constant), and the number of position-corrected clocks for which temperature correction has been performed is calculated and added (the number of clocks in the original information-the number of start clocks-temperature correction). The number of correction clocks adjusted by the number of position correction clocks) is calculated, and the measured digital value of the original information is associated with the number of correction clocks and stored in the main memory MME.

The number of modified clocks in the main memory is calculated by calculating the elapsed time t from the start of measurement as t = the number of modified clocks * Δt (clock cycle), and the measured value of the original information in the measuring device ID and the measuring number ID in the main memory. The number of correction clocks is stored in association with each other.
The measurement data at the same time has the same correction clock number (number) of the same measurement number ID in each measurement device.
By performing vibration analysis of the object to be measured using the measurement data at the same time, it is possible to analyze the accurate vibration state, the presence or absence of cracks, and the like.

In addition to the vibration sensor, a load sensor, strain sensor, displacement measurement sensor, or other sensor suitable for the purpose of measurement can be used for measurement.

G ₁ Multi-point simultaneous measurement system of Example 1 G _{2 Multi-point simultaneous measurement system of Example 2 G 3} Multi-point simultaneous measurement system of Example 3 BR Large bridge K ₁₁ , K ₁₂ , K ₁₃ , K ₁₄ , K ₁₅ , K ₁₆ , K ₁₇ , K ₁₈ , K ₁₉ Measuring device with the same structure as in Example 1 KCOM Measuring device computer CPU Computer KCOM CPU
KINT Computer KCOM Interface KDS Digital Modulation Radio Transmitter KDR Digital Modulation Radio Receiver KDH Digital Modulator KDI Digital Signal Input Unit KDRF Digital Demodulator KDRO Digital Signal Output Unit (Digital Signal Extraction Unit)
KAR Analog Modulated Radio Receiver KARF Analog Modulated Radio Demodulator (Analog Demodulator)
KARO analog signal output unit ANT antenna SES measurement sensor AD A / D converter SAC data sampling clock generation circuit KCC clock counter KSW constantly open clock switch KME computer KCOM memory KMEK basic soft memory unit KMED data memory unit MK analyzer MCOM Analytical device MK computer MCPU Computer MCOM CPU
Interface of MINT computer MCOM Main memory of MME computer MCOM MDS digital modulation radio wave transmitter MDR digital modulation radio wave receiver MDH digital modulator MDI digital signal input unit MDRF digital demodulator MDRO digital signal output unit MAS analog modulation radio wave transmitter (digital type) Wireless transmitter)
MASF analog modulator (analog radio modulator)
MASI measurement start signal input part MAB measurement start button MANT radio antenna MMEK basic soft memory part MMED main memory MME data memory part MDIS display MKB keyboard and mouse MHD external HDD
f data sampling frequency CN _G original information of the clock number (the number of clocks)
CN _S correction clock number (the number of correction clock)
t Elapsed time from the start of measurement Δt 1 clock cycle 1 / fsec
SL lighting device LR receiver SSH ultrasonic transmitter SW power switch SSR ultrasonic receiver SSE ultrasonic transmitter

Claims (9)

The measurement value of the measurement sensor is sampled at a fixed time interval of the built-in clock or the data sampling clock of a predetermined frequency, the measurement value of the measurement sensor is converted into a digital value, and the original information is associated with the clock number of the data sampling clock. By digitally modulated radio waves, a computer is used to store the data in the memory, and the measurement sensors are arranged at different positions. When received and input, the modified clock number value obtained by subtracting the predetermined clock number value from the clock number value of the data sampling clock of the original information is used so that the clock numbers at the start of measurement of each measuring device match, and the measured value is used as the measured value. An analyzer using a computer that has a modification program that associates with the modified modified clock number and stores it as authentic information, and an analog-modulated radio wave that simultaneously transmits a measurement start signal to each measuring device using analog-modulated radio waves. Consists of a transmitter
Each measuring device and analysis device is assigned an ID number of the measuring device ID and the measurement number ID so that the measuring device and the measurement number can be separated by a digital method, and the digital value of the measured value of the original information and the corresponding clock. It is equipped with a digitally modulated radio transmitter, a digitally modulated radio receiver, a digital demodulator and a digital modulator for transmitting and receiving numbers and necessary control signals and data by radio waves, and the measuring device is an analog that receives the analog modulated radio waves. The modulated radio wave receiver, the analog demodulator that extracts the measurement start signal from the tuning signal of the analog modulated radio wave receiver, and the measurement start signal output by the analog demodulator of the corresponding sampling clock at the measurement start time of the measuring device. It is equipped with measurement software that stores the digital value of the clock number and the measurement value of the subsequent measurement sensor and the clock number of the sampling clock as original information in the memory.
The analysis device has a GPS device or a built-in clock and can generate accurate time data, and digitally modulated radio waves from each measuring device the clock number of the data sampling clock stored therein and the original information of the corresponding measured value. A multi-point simultaneous measurement system that calculates the measured values at the same time in each measuring device by executing the modification program that performs the following processing when received by.
Note: The data of the measurement sensor with the same measurement device ID and the same measurement number ID received by the digitally modulated radio waves from each measurement device, and the data of the original information of the measurement value associated with the clock number of the data sampling clock is analyzed by the analysis device. Stored as original information data in the main memory
Next, the clock number of the corresponding data sampling clock at the measurement start time of each measuring device is set as the start clock number from the original information data of the main memory, and then the start is started from the clock number of each data sampling clock of the original information of each measuring device. The clock number value is subtracted to obtain the modified clock number value, and the measured value corresponding to the clock number of the data sampling clock of the original information data of the main memory is associated with the modified clock number and stored in the main memory as genuine information. A correction program that calculates the corresponding measurement value of the same correction clock number in the memory as the authentic measurement value of each measurement device at the same time. The measurement value of the measurement sensor is sampled at a fixed time interval of the built-in clock or the data sampling clock of a predetermined frequency, the measurement value of the measurement sensor is converted into a digital value, and the original information is associated with the clock number of the data sampling clock. The original information of the clock number of the data sampling clock corresponding to the measured values of each measuring device and the plurality of measuring devices in which the measuring sensors are arranged at different positions using a computer stored in the memory as a digitally modulated radio wave is used. The measured value is corrected by subtracting the value of the predetermined clock number from the value of the clock number of the data sampling clock of the original information so that the clock numbers at the start of measurement of each measuring device match when received and input. It consists of an analyzer using a computer that has a modification program that associates with the modified clock number and stores it as authentic information, and a floodlight or illuminator that simultaneously projects an optical signal indicating a measurement start signal to each measuring device.
Each measuring device and analysis device is assigned an ID number of the measuring device ID and the measuring number ID so that the measuring device and the measuring number can be separated from each other, and the digital value of the measured value of the original information and the corresponding clock are digitally used. It is equipped with a digitally modulated radio wave transmitter, a digitally modulated radio wave receiver, a digital demodulator and a digital modulator for transmitting and receiving a number and necessary control signals and data by radio waves, and the measuring device is the said from the floodlight or the illuminator. A receiver that outputs a measurement start signal when an optical signal is received, and a digital value of the clock number of the corresponding sampling clock at the start of measurement of the measuring device and the measurement value of the subsequent measurement sensor with the measurement start signal output by the receiver. And the measurement start software that stores the clock number of the sampling clock as the original information in the memory.
The analysis device has a GPS device or a built-in clock and can generate accurate time data, and digitally modulated radio waves from each measuring device the clock number of the data sampling clock stored therein and the original information of the corresponding measured value. A multi-point simultaneous measurement system that calculates the measured values at the same time in each measuring device by executing the modification program that performs the following processing when received by.
Note: The data of the measurement sensor with the same measurement device ID and the same measurement number ID received by the digitally modulated radio waves from each measurement device, and the data of the original information of the measurement value associated with the clock number of the data sampling clock is analyzed by the analysis device. Stored as original information data in the main memory
Next, the clock number of the corresponding data sampling clock at the measurement start time of each measuring device is used as the start clock number from the original information data of the main memory, and then the start clock number value is subtracted from each clock number of the original information of the measuring device. The modified clock number value is used, and the measured value corresponding to the clock number of the data sampling clock of the original information data of the main memory is associated with the modified clock number and stored in the main memory as genuine information, and the same modification of the main memory is performed. A modification program that calculates the measured value corresponding to the clock number as the authentic measured value of each measuring device at the same time. The measurement value of the measurement sensor is sampled at a fixed time interval of the built-in clock or the data sampling clock of a predetermined frequency, the measurement value of the measurement sensor is converted into a digital value, and the original information is associated with the clock number of the data sampling clock. The original information of a plurality of measuring devices in which the measuring sensors are arranged at different positions and the clock numbers of the measured values of each measuring device and the corresponding data sampling clock are received by digitally modulated radio waves. Is input, the measured value of the original information of each received measuring device is associated with the clock number of the data sampling clock, and the measuring device ID and the measurement number ID are associated with each other and written to the main memory as the original information. The clock number of each measuring device at the start of measurement of ultrasonic transmission is the same, considering the clock number of the original information as the number of clocks, considering the difference in the transmission time of ultrasonic waves due to the distance difference between each ultrasonic receiver and the ultrasonic transmitter. An analyzer using a computer having a correction program that corrects the corresponding clock number of the measured value so as to be associated with the measured value as a correction clock number indicating the same time and stores it as authentic information in the main memory. It consists of an ultrasonic transmitter that simultaneously transmits the ultrasonic waves of the measurement start signal to each measuring device.
Each measuring device and analysis device is assigned an ID number of the measuring device ID and the measuring number ID so that the measuring device and the measuring number can be separated from each other, and the digital value of the measured value of the original information and its corresponding data sampling are performed by a digital method. It is equipped with a digitally modulated radio wave transmitter, a digitally modulated radio wave receiver, a digital demodulator and a digital modulator for transmitting and receiving the clock number of the clock and necessary control signals and data by radio waves, and the measuring device further transmits the ultrasonic signal. An ultrasonic receiver that outputs a measurement start signal when it is received, and a digital measurement start signal output by the same ultrasonic receiver that corresponds to the sampling clock clock number at the start of measurement of the measuring device and the measurement value of the subsequent measurement sensor. Equipped with measurement start software that stores the value and the clock number of the sampling clock as original information in the memory.
The analyzer has a GPS device or a built-in clock and can generate accurate time data, and the arrival time of ultrasonic reception depending on the distance between the ultrasonic transmitter at a predetermined position and the ultrasonic receiver of each measuring device. The time of When the original information of the clock number and the corresponding measured value is received by the digitally modulated radio wave, the above-mentioned modification program that performs the following processing is executed to calculate the measured value at the same time in each measuring device at the same time. Measurement system.
Note: The data of the measurement sensor with the same measurement device ID and the same measurement number ID received by the digitally modulated radio waves from each measurement device, and the data of the original information of the measurement value associated with the clock number of the data sampling clock is analyzed by the analysis device. Stored as original information data in the main memory
Next, the start clock number of the corresponding data sampling clock number at the measurement start time of each measuring device is obtained from the original information data of the main memory, and then the start clock number value is obtained from each data sampling clock number of the original information of each measuring device. Is subtracted, and the correction clock number calculated by further adding the number of position correction clocks is obtained, and the measurement value corresponding to the clock number of the data of the original information stored in the measuring device ID is associated with the correction clock number value. A modification program that stores as authenticity information in the main memory and calculates that the corresponding measurement value of the same modification clock number in the main memory is the authentic measurement value of each measuring device at the same time. The multipoint simultaneous measurement system according to claim 1, wherein an analog modulated radio wave transmitter that transmits a measurement start signal is incorporated as an accessory device that can be controlled from an analysis device. The multipoint simultaneous measurement system according to claim 2, wherein the power source of the illuminator or the floodlight that simultaneously floods the light of the measurement start signal is incorporated as an accessory device that can be controlled to open and close by wire or wirelessly with an analysis device. The multipoint simultaneous measurement system according to claim 1 or 2, wherein each measuring device is arranged so as to be within a range of 3 km. The multipoint simultaneous measurement system according to claim 3, wherein an ultrasonic transmitter is installed near each measuring device, and the ultrasonic transmitter enables ON / OFF of its operation by analog wireless or wired. The multipoint simultaneous measurement system according to claim 3, wherein each measuring device is arranged so as to be within a range of 10 m. The multipoint simultaneous measurement system according to any one of claims 1 to 8, wherein the measurement sensor of each measuring device is a vibration sensor that measures the vibration of the structure.

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