CN103823122B - Small-sized impulse electric field magnetic field integrated measurer - Google Patents
Small-sized impulse electric field magnetic field integrated measurer Download PDFInfo
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- CN103823122B CN103823122B CN201410059742.1A CN201410059742A CN103823122B CN 103823122 B CN103823122 B CN 103823122B CN 201410059742 A CN201410059742 A CN 201410059742A CN 103823122 B CN103823122 B CN 103823122B
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Abstract
The invention discloses a kind of small-sized impulse electric field magnetic field integrated measurer, comprise high performance mixed signal processing single chip acquisition system, electric field antenna, high resistant differential amplifier circuit, little ring magnetic field antenna, integrating circuit and hexahedron metal shielding; Electric field signal is by the ADC0 module acquires of single-chip microcomputer; Field signal is by the ADC1 module acquires of single-chip microcomputer; All circuit are all encapsulated in hexahedron metal shielding.Enabled the windows detecting functional realiey pre-trigger of analog-to-digital conversion module ADC0 by ADC0GT and the ADC0LT register arranging singlechip chip, and store data realization to the random overall pulse waveform acquisition arrived in conjunction with DMA circulation.Acquisition system exchanges data by CAN high-speed transmission interface with extraneous.At same observation station, one-shot measurement can measure pulsed electric field waveforms and pulsed magnetic field waveform simultaneously.This installation cost is low, and work efficiency is high, and antijamming capability is strong.
Description
Technical field
The present invention relates to a kind of small-sized impulse electric field magnetic field measuring device, particularly a kind of integrated digital measurement mechanism for synchro measure impulse electric field and pulsed magnetic field in transient pulse interference of electromagnetic field environment.
Background technology
Transient electromagnetic pulse interference is there is, as electric switch action in factory, the action of converting station electric power electron device, natural thunder discharge process etc. in a lot of environment.For assessing these pulse electromagnetic interference damages, needing to measure them, obtaining their time domain specification and frequency domain characteristic, the halfwidth, spectrum distribution etc. of such as peak value of pulse, pulse rise time, pulse.In addition, the measurement of complex large system medium and small space internal electromagnetic pulse is an importance of puzzlement electromagnetic pulse immunity to interference test, and main cause comprises: little space build-in test needs the microminiaturized sensor that volume is little, disturbance is little badly; Complication system test point is many, and sensor requirements cost is low, is convenient to multiple spot and lays; Test macro self should have the ability of opposing environment electromagnetics interference.Impulse electric field, magnetic field transition are mainly become electric signal with pulsed field sensor by traditional measuring method, then transfer to digital collection memory storage with cable.For the electromagnetic interference (EMI) avoiding cable transmission in electromagnetic interference environment to be subject to, the pulse electromagnetic field signal that people adopt optical fiber to carry out transmission measurement to arrive.No matter be cable transmission or optical fiber transmission signal, all inconvenient in multiple spot distributed measurement, need multiple stage digital collection memory storage, and lay cable in a large number, and acquisition and storage device must be put in electromagnetic shielding chamber or shielding cabinet and prevents pulse electromagnetic field from disturbing it.Moreover traditional impulse electric field and pulsed magnetic field measurement sensor separate, can not accomplish that two kinds of physical quantitys are measured at same point Integral synchronous, just can not obtain the impulse electric field of synchronization and the relation of pulsed magnetic field.In once large-scale pulse electromagnetic environment measurement, traditional measurement method often wants at substantial man power and material.
Summary of the invention
For problem and shortage existing in traditional impulse electric field pulsed magnetic field measurement, the object of the invention is to design a kind of small-sized integrated, digitized pulse electromagnetic field measuring device that anti-electromagnetic interference capability is strong, one-shot measurement can the impulse electric field of synchronization gain same point and pulsed magnetic field waveform, saves transmission cable and digital recording memory device.
Object of the present invention can be achieved through the following technical solutions:
A small in-built High Performance SCM acquisition system of hexahedron micro metal shielding case, its outer 1 opposite flank fills 2 dull and stereotyped electric field antenna of circle, and end face fills little ring magnetic field antenna.This on side forms differential configuration to flat field antenna, the electric field signal in this side surface direction is converted to the voltage signal of difference, is input to the differential amplifier circuit of high resistant input in metal shielding, offsets common mode interference by Metallic rod.The output of differential amplifier circuit connects the input end of 16 high speed analog-to-digital conversion ADC0 of high performance mixed signal processing single chip.Little ring magnetic field antenna is made up of a circle toroidal conductor, and wire overcoat metallic shield pipe shields electric field, and metallic shield pipe middle section laterally disconnects a small gap makes inner wire can produce induction to magnetic field.Magnetic field antenna is input to the integrating circuit in betal can by sub-miniature A connector, by magnetic field antenna to magnetic field induction to differentiated voltage signal carry out integration reduction.The output of integrating circuit connects the input end of 16 high speed analog-to-digital conversion ADC1 of high performance mixed signal processing single chip.
The collection of impulse electric field and pulsed magnetic field, storage and transmission are realized by high performance mixed signal processing single chip system.High performance mixed signal processing single chip system comprises 16,2 built-in tunnel high speed analog-to-digital conversion modules A DC0 and ADC1, the power circuit extended out, crystal oscillating circuit, SRAM memory, SD card, reset circuit, high-speed CAN transmit port etc.Circuits System in whole metal shielding is powered by rechargeable lithium battary.Analog-to-digital conversion module ADC0 and ADC1 is acquisition pulse electric field signal and pulsed magnetic field signal respectively, crystal oscillating circuit provides stable clock for Single Chip Microcomputer (SCM) system, the real time data of SRAM memory storage of collected, SD card stores the data (non-real-time data) in the past gathered, reset circuit provides electrification reset for single-chip microcomputer, and the data high-speed of system acquisition outwards transmits by high-speed CAN transmit port.SRAM memory is connected with it by the parallel port of high performance mixed signal processing single chip, SD card is stored and is connected with it by the SPI mouth of high performance mixed signal processing single chip, and high-speed CAN transmit port is connected with it by the CAN mouth of high performance mixed signal processing single chip.
Tested impulse electric field and pulsed magnetic field are the pulse signals of transient state, capture complete transient pulse waveform requirements acquisition system and there is pre-trigger function, namely acquisition system can collection signal reach triggering level before waveform, and pre-trigger function can be realized to positive pulse and negative pulse.The method that the present invention realizes pulse electromagnetic field pre-trigger data acquisition function is as follows:
1, high performance mixed signal process chip analog-to-digital conversion module windows detecting function able to programme and respective interrupt function is enabled;
2, according to the noise level of pulse electromagnetic field and metering circuit thereof, arrange analog-to-digital conversion module upper limit threshold register and lower threshold register, make upper limit threshold slightly larger than positive noise level, lower threshold is slightly less than negative noise level;
3, enable high performance mixed signal process chip analog-to-digital conversion module direct memory access (DMA) function, and be set to circulation continuation write mode;
4, analog to digital conversion is started;
5, when tested field intensity reaches the upper limit/lower limit threshold level, enter interrupt service routine, write down the address that current image data is deposited, the data acquisition length after triggering is set simultaneously;
6, the data length after analog-to-digital conversion module has adopted triggering just stops gathering, according to the rule of storage address during write down triggering and direct memory access circulation store data, reset the pulse electromagnetic field data measured, and dumped in SD card, carry out circle collection again, wait for that pulse electromagnetic field signal triggers next time.
Compared with prior art, its remarkable advantage is in the present invention:
1, pulse electromagnetic field harvester integrated level is high, and emf sensor, modulate circuit, store circuit etc. integrate, and volume is little, cost is low, easy to use.
2, impulse electric field and pulsed magnetic field measurement circuit is integrated with, can synchronization gain impulse electric field and pulsed magnetic field two kinds of waveforms in same point.
3, highly integrated and digitizing, circuit package, in small 6 body metal shieldings, substantially increases the ability of electromagnetism interference with extraneous without any stube cable during measurement, also little to tested electromagnetic disturbance.
4,2 16 high-speed AD converters of the high performance mixed signal processing single chip inside used, accuracy of data acquisition is high, and speed is fast, can reach 1Msps the soonest.
5, integrated use windows detecting function able to programme and DMA function, realize the pre-trigger function of data acquisition, obtain the Full wave shape of impulse electric field and pulsed magnetic field.
6, use the DMA high-speed data processing function of high performance mixed signal process chip, the high-speed data of collection is deposited in SRAM in real time.
7, with the SPI mouth access SD card of high performance mixed signal process chip, the storage of mass data is achieved.
8, exchanges data with the CAN mouth of high performance mixed signal process chip with extraneous, it is not only fast but also reliably compared with conventional serial interface, its not only economy but also practical compared with USB port.
Accompanying drawing explanation
Fig. 1 is small-sized impulse electric field magnetic field of the present invention integrated measurer schematic diagram.
Fig. 2 is the equivalent circuit diagram of electric-field sensor of the present invention and differential amplification importation thereof.
Fig. 3 is the equivalent circuit diagram that magnetic field sensor of the present invention and integration thereof amplify importation; Fig. 4 is the data acquisition system (DAS) schematic diagram being core with C8051F060 single-chip microcomputer of the present invention.
Embodiment
Below in conjunction with accompanying drawing, describe embodiments of the present invention in detail.
As shown in Figure 1, circular dull and stereotyped electric field antenna 1 and the dull and stereotyped electric field antenna 3 of circle form a pair formation differential configuration electric-field sensor, be arranged on two opposite flanks of hexahedral metal shielding 9, electric field signal is converted to the voltage signal of difference, be input to the differential amplifier circuit 2 of the high resistant input in metal shielding 9 by Metallic rod, the output of differential amplifier circuit 2 connects the input end of 16 high speed analog-to-digital conversion ADC0 of C8051F060 single-chip microcomputer 6.
As shown in Figure 1, little ring magnetic field antenna 4 is equipped with hexahedral metal shielding 9 end face.Little ring magnetic field antenna 4 is made up of a circle toroidal conductor, and wire overcoat metallic shield pipe shields electric field, and metallic shield pipe middle section laterally disconnects a small gap makes inner wire can produce induction to magnetic field.Little ring magnetic field antenna 4 is input to the integrating amplification circuit 5 of in betal can 9 by sub-miniature A connector, by little ring magnetic field antenna 4 pairs of magnetic field inductions to differentiated voltage signal carry out integration reduction.The output of integrating amplification circuit 5 connects the input end of 16 high speed analog-to-digital conversion ADC1 of C8051F060 single-chip microcomputer 6.
As shown in Figure 1, C8051F060 single-chip microcomputer 6 exchanges data by high-speed CAN transmit port 8 with extraneous.
As shown in Figure 1, the power supply of whole measurement mechanism is powered by lithium battery 7.
As shown in Figure 2, tested electric field signal
ewhen polarised direction is perpendicular to flat field antenna, the electric charge of antenna induction
qfor:
（1）
In formula (1)
εthe specific inductive capacity of air, gets 8.85 × 10 approx
-12f/m,
afor the total area of two panels electric field antenna.
As shown in Figure 2,
c ifor the equivalent capacity of antenna;
r efor the differential amplifier circuit equivalent inpnt resistance in Fig. 1;
v efor electric field antenna is input to the voltage of differential amplifier circuit.When
r eit is enough large,
v ewith tested electric field
ebe directly proportional, such as formula (2):
（2）
As shown in Figure 3,
efor the voltage of magnetic field antenna induction, with tested magnetic field
bdifferential be directly proportional, have when tested vertical magnetic field is in magnetic field antenna
e=-
sd
b/ d
t;
smagnetic field antenna loop area;
l afor the equivalent inductance of magnetic field antenna;
r pfor the Input matching resistance of integrating amplification circuit in Fig. 15;
r cfor the integrating resistor of integrating amplification circuit in Fig. 15;
c cfor the integrating capacitor of integrating amplification circuit in Fig. 15;
r lfor the input resistance of integrating amplification circuit in Fig. 15, should be high resistant, enough greatly;
v lfor
ethe voltage obtained after being integrated.Suppose that the highest frequency of measured pulse field signal is
ω, when meeting: R
p"
ω L a with
ωr
cc
c" 1 time,
v lwith tested magnetic field
bbe directly proportional, such as formula (3):
（3）
As shown in Figure 4, the collection of impulse electric field and pulsed magnetic field, storage and transmission are realized by the data acquisition system (DAS) being core with C8051F060 single-chip microcomputer.Data acquisition system (DAS) comprises C8051F060 chip 10, reset circuit 11, LED light 12, quartz crystal oscillator circuit 14, SD storage card 15, the SRAM static memory 16 of IDT71V124SA realization, the CAN high-speed transfer driving interface 8 of SN65HVD230 realization, and 3.3V mu balanced circuit 13, whole system is all encapsulated in metal shielding 9.2 16 high speed analog-to-digital conversion modules A DC0 and the ADC1 that C8051F060 chip 10 inside is integrated with, CAN module, and SPI module etc.Analog-to-digital conversion module ADC0 and the ADC1 of C8051F060 chip 10 is connected with 2 in Fig. 1 and 5 respectively, acquisition pulse electric field signal and pulsed magnetic field signal.Reset circuit 11 and C8051F060 chip 10 /RST pin is connected, for single-chip microcomputer provides electrification reset.LED light 12 is connected with the P1.6 of C8051F060 chip 10, and the 1 secondary data trigger collection condition that is used to indicate produces.Quartz crystal oscillator circuit 14 is connected with the XTAL interface of C8051F060 chip 10, and for Single Chip Microcomputer (SCM) system provides stable clock, frequency is 22.1184MHz.SD storage card 15 is connected with the SPI mouth of C8051F060 chip 10, for storing the data (non-real-time data) gathered in the past.SRAM memory 16 is connected, for the real time data of storage of collected with P5, P6 and P7 tri-interfaces of C8051F060 chip 10.High-speed transfer drives interface 8 to be connected with the CAN module of C8051F060 chip 10, the data high-speed of system acquisition outwards can be transmitted, faster than traditional Serial Port Transmission speed reliable, lower than USB port transmission cost simple again again.Whole digital display circuit provides stable power supply by 3.3V mu balanced circuit 13.
Measured pulse electric field and pulsed magnetic field are the pulse signals of transient state, capture complete pulse waveform requirements acquisition system and there is pre-trigger function, namely acquisition system can collection signal reach triggering level before segment waveform, and can to trigger positive pulse and negative pulse.The analog-to-digital conversion module ADC0 of C8051F060 has windows detecting function able to programme, realizes pre-trigger function by the ADC0GT register and ADC0LT register arranging C8051F060.Datacycle is directly deposited in SRAM by its DMA function by the signal that C8051F060 gathers, when the positive pulse signal gathered is greater than ADC0GT register value or negative pulse is less than ADC0LT register value, the AD0WINT interrupt identification of C8051F060 produces, write down current data storage location by interrupt service routine, and continue the pulse waveform after trigger collection.The data of adopting before this trigger position are pre-trigger data, form complete pulse waveform with the one piece of data of subsequent acquisition.Data length after analog-to-digital conversion module has adopted triggering just stops gathering, according to the rule of the address of depositing during write down triggering and direct memory access circulation store data, reset the pulsed field data measured, and dumped in SD card, and then carry out circle collection, wait for that pulsed field signal triggers next time.Realize pulse electromagnetic field pre-trigger data acquisition function method to be described in detail as follows:
1, C8051F060 analog-to-digital conversion module windows detecting function able to programme and respective interrupt function is enabled;
2, according to the noise level of pulse electromagnetic field and metering circuit thereof, arrange ADC0GT and ADC0LT, make ADC0GT slightly larger than positive noise level, ADC0LT is slightly less than negative noise level;
3, enable C8051F060 analog-to-digital conversion module DMA function, and be set to circulation continuation write mode;
4, analog to digital conversion is started;
5, when tested field intensity reaches the upper limit/lower limit threshold level, enter interrupt service routine, write down the address that current image data is deposited, the data acquisition length after triggering is set simultaneously;
6, the data length after analog-to-digital conversion module has adopted triggering just stops gathering, according to the rule of the address of depositing during write down triggering and direct memory access circulation store data, reset the pulse electromagnetic field data measured, and dumped in SD card, carry out circle collection again, wait for that pulse electromagnetic field signal triggers next time.
Because the data space that can access of C8051F060 is 64kBytes, be also 32kWords.For the data of 16,16k impulse electric field data and 16k pulsed magnetic field data can be deposited respectively.Can arrange the image data length before triggering is 2k, integrates data length as 14k after triggering.When C8051F060 has no progeny according in the window trigger condition generation window preset, P1.6 mouth is set to high level, makes LED light 12 bright, simultaneously continuous acquisition 14k impulse electric field data and 14k pulsed magnetic field data again, just stop gathering, and by the data conversion storage in SRAM in SD storage card.When this triggering collection to data dump to SD storage card completely after, P1.6 mouth is set to low level, LED light 12 is gone out, waits for trigger action collection next time.
The above be only one of the present invention preferred embodiment.For those skilled in the art, under the prerequisite not departing from the technology of the present invention principle, can also make some improvement and distortion (as using other microprocessor chips instead), these improve and distortion also should be considered as protection content of the present invention.
Claims (6)
1. an impulse electric field magnetic field integrated measurer, comprises mixed signal processing single chip acquisition system, electric field antenna, high resistant differential amplifier circuit, little ring magnetic field antenna, integrating circuit and hexahedron metal shielding; It is characterized in that, described electric field antenna is 2 pieces of circular plate aerials, be arranged on a pair side of metal shielding, form differential configuration, and be connected with the high resistant differential amplifier circuit in shielding case by Metallic rod, the output on high resistant differential amplification road meets the modulus acquisition module ADC0 of mixed signal processing single chip acquisition system; Described little ring magnetic field antenna is made up of a circle toroidal conductor, wire overcoat metallic shield pipe, metallic shield pipe middle section laterally disconnects a small gap, little ring magnetic field antenna is exported and is connected with the integrating circuit in metal shielding by sub-miniature A connector, and the output of integrating circuit meets the modulus acquisition module ADC1 of mixed signal processing single chip acquisition system; All circuit are all encapsulated in hexahedron metal shielding.
2. impulse electric field magnetic field according to claim 1 integrated measurer, is characterized in that, one-shot measurement can the impulse electric field in the same place of synchronization gain and pulsed magnetic field waveform.
3. impulse electric field magnetic field according to claim 1 integrated measurer, it is characterized in that, described mixed signal processing single chip acquisition system, comprises mixed signal processing single chip chip, reset circuit, LED light, quartz crystal oscillator circuit, SD storage card, SRAM static memory, CAN high-speed transmission interface; Non-real-time data to SRAM static memory, and is deposited in SD storage card by mixed signal processing single chip energy Real-time Collection impulse electric field field signal.
4. impulse electric field magnetic field according to claim 1 integrated measurer, is characterized in that, described mixed signal processing single chip acquisition system, exchanges data by CAN high-speed transmission interface with extraneous.
5. impulse electric field magnetic field according to claim 1 integrated measurer, it is characterized in that, enabled the windows detecting functional realiey data acquisition pre-trigger of analog-to-digital conversion module ADC0 by the upper limit threshold and lower threshold register arranging mixed signal processing single chip, and store data realization to the random overall pulse waveform acquisition arrived in conjunction with direct memory access (DMA) circulation.
6. impulse electric field magnetic field according to claim 5 integrated measurer, is characterized in that, described data acquisition pre-trigger comprises the following steps:
(1) mixed signal processing single chip analog-to-digital conversion module windows detecting function able to programme and respective interrupt function is enabled;
(2) according to the noise level of pulse electromagnetic field and metering circuit thereof, arrange analog-to-digital conversion module upper limit threshold register and lower threshold register, make upper limit threshold slightly larger than positive noise level, lower threshold is slightly less than negative noise level;
(3) enable mixed signal processing single chip analog-to-digital conversion module DMA function, and be set to circulation continuation write mode;
(4) analog to digital conversion is started;
(5) when tested field intensity reaches the upper limit/lower limit threshold level, enter interrupt service routine, write down the address that current image data is deposited, the data acquisition length after triggering is set simultaneously;
(6) data length after analog-to-digital conversion module has adopted triggering just stops gathering, according to the rule of the address of depositing during write down triggering and direct memory access circulation store data, reset the pulse electromagnetic field data measured, and dumped in SD card, and then carry out circle collection, wait for that pulse electromagnetic field signal triggers next time.
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| CN104865547B (en) * | 2015-05-10 | 2017-08-22 | 中国人民解放军理工大学 | Integral form pulsed magnetic field measurement system signal injects scaling method |
| CN106645987A (en) * | 2016-11-30 | 2017-05-10 | 中国电力科学研究院 | System and method for measurement of transient state ground electric field |
| CN106872795A (en) * | 2017-01-20 | 2017-06-20 | 中国电力科学研究院 | A kind of system and method for being measured to transient state space electric field |
| CN109932570B (en) * | 2019-01-23 | 2021-03-02 | 东南大学 | Small electric field probe for testing shielding effectiveness of shielding body |
| CN110568268B (en) * | 2019-08-29 | 2021-11-16 | 赵青 | Electric field intensity test system of electric and magnetic field set based on MEMS technology |
| CN113030799A (en) * | 2021-03-07 | 2021-06-25 | 中国人民解放军陆军工程大学 | Double-ring type differential pulse magnetic field sensor |
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| US4672305A (en) * | 1983-07-22 | 1987-06-09 | Ernco Industries, Inc. | Storm warning method and apparatus |
| CN201548622U (en) * | 2009-08-12 | 2010-08-11 | 中国气象科学研究院 | Broadband interferometer three-dimensional lightning radiation source positioning system |
| CN102175929A (en) * | 2011-01-28 | 2011-09-07 | 中国气象科学研究院 | System for integrally, synchronously and comprehensively observing lightning electromagnetic signals |
| CN102841262A (en) * | 2011-06-21 | 2012-12-26 | 武汉市碧海云天环保科技有限责任公司 | Omni-directional intelligent comprehensive field intensity indicator |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4672305A (en) * | 1983-07-22 | 1987-06-09 | Ernco Industries, Inc. | Storm warning method and apparatus |
| CN201548622U (en) * | 2009-08-12 | 2010-08-11 | 中国气象科学研究院 | Broadband interferometer three-dimensional lightning radiation source positioning system |
| CN102175929A (en) * | 2011-01-28 | 2011-09-07 | 中国气象科学研究院 | System for integrally, synchronously and comprehensively observing lightning electromagnetic signals |
| CN102841262A (en) * | 2011-06-21 | 2012-12-26 | 武汉市碧海云天环保科技有限责任公司 | Omni-directional intelligent comprehensive field intensity indicator |
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