CN107436200B - Thermocouple sensor-based temperature measurement access ground test method - Google Patents
Thermocouple sensor-based temperature measurement access ground test method Download PDFInfo
- Publication number
- CN107436200B CN107436200B CN201710637382.2A CN201710637382A CN107436200B CN 107436200 B CN107436200 B CN 107436200B CN 201710637382 A CN201710637382 A CN 201710637382A CN 107436200 B CN107436200 B CN 107436200B
- Authority
- CN
- China
- Prior art keywords
- temperature
- sensor
- thermocouple
- hot end
- measurement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
Abstract
The invention provides a thermocouple sensor-based ground test method for a temperature measurement access, wherein the temperature measurement access adopts a hot end of a thermocouple sensor to measure the temperature of a part to be tested and displays the temperature through ground test equipment, and the method comprises the following steps: (1) connecting the temperature measuring passage; (2) placing the special heating device at the hot end testing part of the thermocouple temperature sensor, and keeping the temperature of the heating device constant at a preset temperature T; (3) and continuously monitoring the temperature of the measured part for a certain time, and judging whether the difference between the temperature measurement value Tr and the preset value T is within a preset range, if so, judging that the temperature measurement channel is normal, otherwise, judging that the temperature measurement channel is abnormal. The method solves the technical problem that the channel between the sensor and the converter cannot be tested due to no voltage output of the thermocouple temperature sensor when the measurement system on the aircraft performs ground test.
Description
Technical Field
The method is a method for quickly testing a temperature measurement channel on the ground based on a temperature excitation mode, is particularly suitable for testing the measurement channel of the sensor based on the thermocouple principle of the irregular surface on an aircraft, and belongs to the technical field of measurement.
Background
Thermocouples are generally made up of two chemically dissimilar metal wires welded together at one end and placed in the medium being measured, called the hot end. The end associated with the measurement device is called the cold end. The electric heat output by the thermocouple is a function of the temperature difference between the hot end and the cold end. When the material of the thermocouple is uniform, the magnitude of the thermoelectric potential of the thermocouple is irrelevant to the geometric dimensions of the hot end and the cold end, and is only relevant to the composition of the material of the thermocouple and the temperature difference between the hot end and the cold end. In order to make the output potential a single function of the measured temperature, T is generally taken as the measured temperature end, T0As a stationary cold end (reference temperature end). Generally requires T0Keeping constant, this is usually solved by cold end compensation. The thermocouple is schematically shown in FIG. 1.
Thermocouple temperature sensors based on the principle of thermocouple thermometry are used in a large number of applications in measurement systems. When the measuring system is used for ground test, because the environmental temperature change is small, the temperatures of the hot end and the cold end almost have no temperature difference, namely no electromotive force is output, and the temperature of the measuring system is compensated by the temperature. Because the thermocouple temperature sensor has no electromotive force output and is also the output expression of open circuit or short circuit fault of the sensor, the condition that whether the sensor works normally or not can not be verified during system test is easily caused.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method overcomes the defects of the prior art, provides a thermocouple sensor-based temperature measurement access ground test method, and solves the technical problem that the access between a sensor and a converter cannot be tested due to no voltage output of the thermocouple temperature sensor during the test of a measurement system on an aircraft.
The technical solution of the invention is as follows: a temperature measurement access ground test method based on a thermocouple sensor is disclosed, the temperature measurement access adopts a hot end of the thermocouple sensor to measure the temperature of a measured part and displays the temperature through ground test equipment, and the method comprises the following steps:
(1) connecting the temperature measuring passage;
(2) placing the heating device at the hot end testing part of the thermocouple temperature sensor, and keeping the temperature of the heating device constant to be a preset temperature T, so that the special heating device is in good contact with the hot end structure and the heat is transferred sufficiently;
(3) continuously monitoring the temperature of the measured part for a certain time, and judging whether the temperature measurement value Tr meets the following conditions:
|T-Tr|<P×Tf；
in the formula, Tf is the temperature measurement range of the thermocouple sensor in the temperature measurement channel, and P is the temperature measurement precision of the temperature channel; if the temperature measurement channel is normal, judging that the temperature measurement channel is normal, otherwise, judging that the temperature measurement channel of the measurement and control system is abnormal.
The contact area of the heating device and the part to be measured is more than 10 times of the heated area, so that the heat transfer is sufficient.
The period of time in the step (3) is more than or equal to 600 s.
The difference between the preset temperature T and the test environment temperature is not more than 3% of the full range of the temperature sensor, or not less than 5 times of the measurement resolution of the system.
The heating device comprises a heating body (1), a temperature sensor (2), a liquid storage bag (3), an overheating switch (4) and a controller (5), wherein heated liquid is stored in the liquid storage bag in a sealed mode, the heating body has an electric heating function and is located inside the liquid storage bag and used for heating the liquid, the temperature sensor is used for measuring the temperature of the liquid in the liquid storage bag in real time and sending the temperature to the controller, the controller is used for setting the temperature and controlling a power supply, the temperature sent by the temperature sensor is compared with a preset temperature, and when the temperature exceeds a preset overheating threshold, the overheating switch is controlled to automatically disconnect the power supply; and when the temperature is lower than a preset heating threshold, controlling to turn on the power supply.
The temperature measuring channel comprises a thermocouple temperature sensor, a temperature converter, an encoder and ground testing equipment, wherein the thermocouple temperature sensor is used for measuring temperature environment parameters, the temperature difference between the hot end and the cold end of the thermocouple is converted into potential difference which is sent to the temperature converter, the temperature converter detects and amplifies the temperature potential difference between the hot end and the cold end of the thermocouple temperature sensor to obtain the hot end and cold end voltage difference, the temperature of the thermocouple temperature sensor is compensated to obtain the cold end voltage corresponding to the absolute temperature of the cold end, then the hot end and cold end voltage difference is added to obtain the voltage value corresponding to the absolute temperature of the hot end, the voltage value is converted into the voltage in the standard voltage range through conditioning conversion and is output to the encoder, then the encoder and other physical parameters form measuring parameters, the measuring parameters are sent to the ground testing equipment, and the ground testing equipment analyzes the measuring, and obtaining the absolute temperature of the measured part.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adjusts the temperature of the hot end of the thermocouple through the heating device to give out an excitation signal of the temperature sensor, thereby realizing the test of the temperature sensor at normal temperature.
(2) The heating device is made of flexible materials, so that the measurement of temperature sensors at different structures is facilitated;
(3) the method and the device judge whether the temperature sensor is normal or not, simultaneously consider the temperature measurement range of the thermocouple sensor and the temperature measurement precision of the temperature access, and are reasonable and efficient.
Drawings
FIG. 1 is a schematic view of a thermocouple;
FIG. 2 is a schematic diagram of a temperature measurement path test of a measurement system according to an embodiment of the present invention;
FIG. 3 is a schematic view of a temperature sensor assembly according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a high-precision amplifying circuit of a temperature measuring path according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cold end compensation circuit for a temperature measurement path according to an embodiment of the present invention;
FIG. 6 is a schematic block diagram of a temperature measurement path editor according to an embodiment of the present invention;
FIG. 7 is a schematic view of a warming apparatus according to an embodiment of the present invention;
FIG. 8(a) is a graph of temperature sensor test results prior to temperature excitation, in accordance with an embodiment of the present invention;
FIG. 8(b) is a graph showing the temperature sensor test results after temperature excitation according to the embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific examples.
The following description is provided in terms of a measurement system temperature measurement path on an aircraft. The temperature measurement path is schematically shown in fig. 2. The temperature measuring channel consists of a thermocouple temperature sensor, a temperature converter, an acquisition and editing device and ground testing equipment. Wherein:
(1) thermocouple temperature sensor
The thermocouple temperature sensor completes measurement of temperature environment parameters, converts physical parameters into electric signals, and mainly comprises a thermocouple wire, an output interface and the like. The temperature sensor is reliably contacted with the part of the structure to be measured, and can directly sense the temperature parameter of the part. The temperature sensor is mounted as shown in fig. 3.
(2) Temperature changer
The temperature converter comprises a high-precision amplifying circuit and a cold end compensation circuit. The high-precision amplifying circuit detects the temperature difference between the hot end and the cold end of the thermocouple temperature sensor to form a hot end and cold end voltage difference, the cold end compensating circuit compensates the temperature of the thermocouple temperature sensor to obtain a cold end voltage corresponding to the absolute temperature of the cold end, then the hot end and cold end voltage difference and the cold end voltage are added to obtain a voltage value corresponding to the absolute temperature of the hot end, and the voltage value is converted into a voltage output mining and editing device in a standard voltage range through conditioning transformation.
The high-precision amplifying circuit is used for amplifying electromotive force output by the temperature sensor, a programmable instrument amplifier AD8556 can be selected, the chip is powered by 5V, programming is carried out through a numerical control input end, and the zero position and the amplification factor of the instrument amplifier are set. As shown in fig. 4, the high-precision amplification circuit includes a programmable instrumentation amplifier AD8556, capacitors C1, C2, and resistors R1 and R2.
The positive end of a power supply of the programmable instrument amplifier AD8556 is connected with +5V for power supply, the negative end of the power supply is connected with a capacitor C2 and the ground, the other end of a capacitor C2 is connected with a 5V signal, a filtering end is grounded through a capacitor C1 and used for low-pass filtering, a clamping end is connected with 5V and grounded through resistors R1 and R2 which are connected in series and used for clamping output voltage to enable the output voltage not to be higher than 5V, and the positive signal input end and the negative signal input end of the clamping end are respectively connected with the hot end and the cold end of.
The output formula of AD8556AR is as follows:
VOUT＝GAIN(VPOS-VNEG)+VDAC
wherein VPOS-VNEG is an input thermocouple signal, VDAC is an adjustable bias voltage (which can be set to be 20 mv-5V), and GAIN is an amplification factor (which can be set to be 70-1280).
According to the formula, if the output range of the thermocouple is-1.2 mV-48.9 mV, the amplification factor is 92 times, and the bias voltage is 0.31V when the output range of the thermocouple is amplified to be within the range of 0.2V-4.8V.
As shown in FIG. 5, the cold end compensation circuit is used for compensating the cold end not at 0 deg.C, and the temperature sensor DS600 used is of semiconductor type with an accuracy of 0.75 deg.C within (-40 to +125) deg.C and an accuracy of 0.5 deg.C within (-20 to +100) deg.C. The output sensitivity of the sensor is 6.45 mV/DEG C, and the output at 0 ℃ is 509 mV. Under full scale, the output voltage range is (251-1315) mV.
The temperature converter finishes the conditioning conversion from a nonstandard electric signal (usually dozens of mV) output by the temperature sensor to a standard electric signal (a voltage signal of 0-5V).
(3) Mining and editing device
And the acquisition and coding device acquires and codes the standard electric signal output by the temperature converter, forms telemetering parameters with other telemetering parameters and sends the telemetering parameters to ground test equipment.
As shown in fig. 6, the codec is generally composed of an analog switch, a/D conversion, encoding, and the like. The analog quantity switch is used for controlling the gating of the multi-channel analog quantity parameters, the A/D conversion is used for carrying out analog/digital conversion on the gated analog quantity parameters, and the coding part is used for finishing the unified coding of the multi-channel parameter data. Taking a 64-path mining and editing device as an example, an input analog signal is connected to four 16-to-1 first-stage analog switches after being subjected to operational amplification, and is connected to a 4-to-1 second-stage analog switch after being gated by the first-stage analog switch, a 0-5V analog signal output by the second-stage analog switch is divided into 0-2.5V through a resistor, and is output to a coding control module after being subjected to operational amplification, and is output after being subjected to unified coding.
(4) Ground test equipment
And receiving the telemetering parameters sent by the mining and editing device, analyzing the telemetering parameters to obtain and display the absolute temperature of the part to be detected where the hot end is located.
Based on the temperature measurement access, the invention provides a temperature measurement access ground test method, which comprises the following steps:
(1) connecting the temperature measuring passage;
(2) placing the special heating device at the hot end testing part of the thermocouple temperature sensor, and keeping the temperature of the heating device constant to be a preset temperature T, so that the special heating device is in good contact with the hot end structure and the heat is transferred fully; the special heating device is generally a flexible heating device, is convenient to contact with a structural good, and the temperature state of the device is different from the test environment temperature, namely: the difference between the preset temperature T and the test environment temperature is not more than 3% of the full range of the temperature sensor, or not less than 5 times of the measurement resolution of the system.
As shown in fig. 7, the temperature sensor 11 is mounted in a through-hole penetrating the interior aircraft surface 12 of the aircraft housing 13 by means of a mounting nut 14, in a position where the structural profile of the aircraft surface is not perfectly regular. Since the sensor is limited by the installation location and structure after being installed on the aircraft, it is inconvenient to adopt a fixed-shape heating device. In order to meet the universality of measurement, the invention provides a special heating device, which comprises: heating member 1, temperature sensor 2, overheat switch 3, reservoir 4, inoxidizing coating 5, seal 6, controller 7, wherein:
the outer coating of reservoir 4 has wear-resisting fiber cloth inoxidizing coating 5, and inside is sealed the storage through seal 6 and is heated and use liquid, and heating member 1, temperature sensor 2 and overheat switch (3) are installed to the inboard, realize reservoir and outside isolated through seal 6. The heating body 1 has an electric heating function and is used for heating liquid, the temperature sensor 2 is used for measuring the temperature of the liquid in the liquid storage bag 4 in real time and sending the temperature to the controller 7, the overheating switch 3 is a safety device, and the power supply is automatically cut off when the temperature is overheated;
the controller 7 is connected with the heating body 1 and the temperature sensor 2 through cables and is used for temperature monitoring and power supply control. The outer side of the controller 7 is provided with a temperature display screen 8, a temperature setting area 9 and a power supply port 10, the controller 7 receives the temperature sent by the temperature sensor 2, displays the temperature on the temperature display screen 8, compares the temperature with the preset temperature of the temperature setting area, and controls the overheating switch 3 to automatically disconnect the power supply when the temperature exceeds the preset overheating threshold of the temperature setting area; when the temperature is lower than the preset heating threshold of the temperature setting area, the power supply is controlled to be turned on, and a power supply signal is output to the heating body and the temperature sensor through the power supply port 10. The liquid temperature rises after the heating body 1 is electrified. After the temperature rises to the set heating threshold, the power supply path is closed, the power supply path is reduced to the preset heating threshold, the power supply is recovered, and the heating body 1 heats to ensure that the temperature of the liquid is constant.
During testing, the liquid storage bag of the special heating device is paved on the surface of the tested part. In order to facilitate sufficient heat transfer, the contact area of the special heating device and the part to be detected is larger than 10 times of the heated area.
(3) Continuously monitoring the temperature of the measured part for a certain time, and judging whether the temperature measurement value Tr meets the following conditions:
|T-Tr|<P×Tf；
in the formula, Tf is the temperature measuring range (unit:. degree. C.) of the thermocouple sensor in the temperature measuring channel, and P is the temperature measuring precision (unit:%) of the temperature measuring channel;
if yes, the temperature measuring channel is judged to be normal, otherwise, the temperature measuring channel is judged to be abnormal. The period of time is greater than or equal to 600 s.
The method comprises the steps of heating a measuring part of a sensor by adopting a special heating device, enabling a hot end and a cold end of the sensor to generate temperature difference, enabling a cold end and a hot end of a thermocouple sensor to generate potential difference, enabling a passage between the sensor and a converter to pass current, and judging whether the temperature of a measuring point in a measuring system rises or falls in ground testing equipment to determine whether the passage is effective or not.
Example (b):
in the ground test process of a certain aircraft measurement system, the method is used for testing a layered temperature measurement device (a temperature measurement device based on the thermocouple principle) arranged on an outer surface structure of an aircraft, a special heating device is used for heating the arc-shaped outer surface, wherein one path of ground test results are shown in fig. 8, fig. 8(a) is a temperature measurement value before temperature excitation, and the temperature value is 17 ℃. The temperature value is the ambient temperature at that time, and whether the measured thermocouple sensor has a short circuit or an open circuit fault cannot be eliminated from the measured value. Fig. 8(b) shows the measured temperature value after temperature excitation, which is 31 ℃. The temperature value is higher than the ambient temperature at that time, and the fault that the measured thermocouple sensor has short circuit or open circuit can be eliminated. This indicates that the temperature response of the channel is normal and the temperature measurement channel is tested in place.
The testing method is applied to a measuring system on a certain aircraft, the channel test of the measuring system in the comprehensive test and the final assembly test of the measuring system of the certain aircraft is completed, the testing purpose is achieved, and the hidden trouble that the fault of the measuring channel is not discovered is avoided.
The invention is not described in detail and is part of the common general knowledge of a person skilled in the art.
Claims (4)
1. A thermocouple sensor-based ground test method for a temperature measurement access is suitable for testing the measurement access of a sensor based on the principle of an irregular surface thermocouple on an aircraft, the temperature of a tested part of the temperature measurement access is measured by a hot end of a thermocouple sensor and is displayed by ground test equipment, and the method is characterized by comprising the following steps of:
(1) connecting the temperature measuring passage; the temperature measuring channel comprises a thermocouple temperature sensor, a temperature converter, an encoder and ground testing equipment, wherein the thermocouple temperature sensor is used for measuring environmental temperature parameters, the temperature difference between the hot end and the cold end of the thermocouple is converted into potential difference which is sent to the temperature converter, the temperature converter detects and amplifies the temperature potential difference between the hot end and the cold end of the thermocouple temperature sensor to obtain the hot end and cold end voltage difference, the temperature of the thermocouple temperature sensor is compensated to obtain the cold end voltage corresponding to the absolute temperature of the cold end, then the hot end and cold end voltage difference is added to obtain the voltage value corresponding to the absolute temperature of the hot end, the voltage value is converted into the voltage in the standard voltage range through conditioning conversion and is output to the encoder, then the encoder and other physical parameters form measuring parameters, the measuring parameters are sent to the ground testing equipment, and the ground testing equipment analyzes the measuring parameters, obtaining the absolute temperature of the measured part;
(2) placing the heating device at the hot end testing part of the thermocouple temperature sensor, and keeping the temperature of the heating device constant to be a preset temperature T, so that the special heating device is in good contact with the hot end structure and the heat is transferred sufficiently;
the special heating device comprises a heating body (1), a temperature sensor (2), a liquid storage bag (3), an overheating switch (4) and a controller (5), wherein heated liquid is stored in the liquid storage bag in a sealed mode, the heating body has an electric heating function and is located inside the liquid storage bag and used for heating the liquid, the temperature sensor is used for measuring the temperature of the liquid in the liquid storage bag in real time and sending the temperature to the controller, the controller is used for temperature setting and power supply control, the temperature sent by the temperature sensor is compared with a preset temperature after the temperature sent by the temperature sensor is received, and when the temperature exceeds a preset overheating threshold, the overheating switch is controlled to automatically cut off the power supply; when the temperature is lower than a preset heating threshold, controlling to start a power supply;
(3) continuously monitoring the temperature of the measured part for a certain time, and judging whether the temperature measurement value Tr meets the following conditions:
|T-Tr|<P×Tf；
in the formula, Tf is the temperature measurement range of the thermocouple sensor in the temperature measurement access, and P is the temperature measurement precision of the temperature measurement access; if yes, the temperature measuring channel is judged to be normal, otherwise, the temperature measuring channel is judged to be abnormal.
2. The thermocouple sensor-based ground testing method for the temperature measuring channel according to claim 1, wherein the contact area of the heating device and the tested part is more than 10 times of the heated area, so that the heat transfer is sufficient.
3. The thermocouple sensor-based temperature measurement access ground test method according to claim 1, wherein: and (4) the certain time in the step (3) is more than or equal to 600 s.
4. The thermocouple sensor-based temperature measurement access ground test method according to claim 1, wherein: the difference between the preset temperature T and the test environment temperature is not more than 3% of the full range of the temperature sensor, or not less than 5 times of the measurement resolution of the system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710637382.2A CN107436200B (en) | 2017-07-31 | 2017-07-31 | Thermocouple sensor-based temperature measurement access ground test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710637382.2A CN107436200B (en) | 2017-07-31 | 2017-07-31 | Thermocouple sensor-based temperature measurement access ground test method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107436200A CN107436200A (en) | 2017-12-05 |
| CN107436200B true CN107436200B (en) | 2020-07-14 |
Family
ID=60460455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710637382.2A Active CN107436200B (en) | 2017-07-31 | 2017-07-31 | Thermocouple sensor-based temperature measurement access ground test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107436200B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111609944A (en) * | 2020-05-22 | 2020-09-01 | 南京高华科技股份有限公司 | High-integration projectile body layering temperature sensor and measurement system |
| CN112179522A (en) * | 2020-09-14 | 2021-01-05 | 中国空气动力研究与发展中心超高速空气动力研究所 | Aircraft surface temperature sensor testing system and testing method |
| US20230215746A1 (en) * | 2021-12-30 | 2023-07-06 | Semes Co., Ltd. | Temperature controller |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1059203A (en) * | 1990-08-17 | 1992-03-04 | 冶金工业部自动化研究院 | Quick temperature measurement thermocouple calibration method and device |
| GB2295253B (en) * | 1994-11-18 | 1999-03-10 | Europ Gas Turbines Ltd | Apparatus and method for the calibration of thermal paint |
| CN100351620C (en) * | 2004-12-07 | 2007-11-28 | 大连理工大学 | Computer inspecting method for installing quality of thermocouple on cast wall |
| US8118484B2 (en) * | 2009-03-31 | 2012-02-21 | Rosemount Inc. | Thermocouple temperature sensor with connection detection circuitry |
| CN102860899A (en) * | 2012-10-10 | 2013-01-09 | 佛山市顺德区美美创新电器有限公司 | Electric heating hand warmer with ceramic electric heating substrate |
-
2017
- 2017-07-31 CN CN201710637382.2A patent/CN107436200B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107436200A (en) | 2017-12-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107436200B (en) | Thermocouple sensor-based temperature measurement access ground test method | |
| US7841771B2 (en) | Self-validating thermocouple | |
| JP5735484B2 (en) | Thermocouple assembly and cold junction compensation using the same | |
| EP2330035B1 (en) | Impending icing probe with thermal isolation pedestal | |
| EP2302344A2 (en) | An apparatus for measuring temperature and method thereof | |
| EP3519786A1 (en) | Heat flux sensor | |
| WO2000079501A1 (en) | Improved error compensation for process temperature transmitter | |
| US5841204A (en) | Temperature control system and method | |
| US20160305898A1 (en) | Arrangement and method for measuring and controlling the heating temperature in a semiconductor gas sensor | |
| US9207129B2 (en) | Process variable transmitter with EMF detection and correction | |
| CN106289537B (en) | Built-in self-test circuit and method for infrared thermopile | |
| US4563098A (en) | Gradient compensated temperature probe and gradient compensation method | |
| CN206321361U (en) | Wolfram rhenium heat electric couple verification system | |
| GB2091882A (en) | Electrical catalytic gas detection systems | |
| KR20100101990A (en) | Thermo couple temperature measurement apparatus | |
| CN109460085B (en) | Multi-loop temperature deviation monitoring operation temperature compensation microcomputer temperature control system | |
| CN114370945B (en) | Heating device, infrared temperature measuring device, calibration method and temperature measuring method | |
| CN214149617U (en) | Multi-channel economical high-precision temperature measuring module for thermocouple signals | |
| JPH07113777A (en) | Atmosphere detecting device | |
| CN113390524B (en) | Thermosensitive sensor and working method thereof | |
| CA2918350A1 (en) | Infrared sensor | |
| CN108287515B (en) | Control circuit and electric water heater | |
| CN212567717U (en) | Intelligent temperature sensor device with RS485 output | |
| Moreira et al. | Sensors characterization and control of measurement systems based on thermoresistive sensors via feedback linearization | |
| CN118565630A (en) | Non-contact temperature monitoring detector for electric cable and detection method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |