CN111272289A - Real-time calibration device for thermal infrared imager - Google Patents
Real-time calibration device for thermal infrared imager Download PDFInfo
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- CN111272289A CN111272289A CN202010126404.0A CN202010126404A CN111272289A CN 111272289 A CN111272289 A CN 111272289A CN 202010126404 A CN202010126404 A CN 202010126404A CN 111272289 A CN111272289 A CN 111272289A
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- 230000000007 visual effect Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 7
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- 230000005457 Black-body radiation Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 238000005259 measurement Methods 0.000 description 9
- 238000009529 body temperature measurement Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000001931 thermography Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0887—Integrating cavities mimicking black bodies, wherein the heat propagation between the black body and the measuring element does not occur within a solid; Use of bodies placed inside the fluid stream for measurement of the temperature of gases; Use of the reemission from a surface, e.g. reflective surface; Emissivity enhancement by multiple reflections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
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Abstract
The invention relates to a real-time calibration device for a thermal infrared imager, which comprises the thermal infrared imager, a temperature sensor, a calibration panel, a sensor data line and an embedded module, wherein the embedded module is used for storing a calibration data; an embedded module is fixedly arranged on one side of the thermal infrared imager, which is far away from the temperature sensor, the embedded module and the temperature sensor are respectively supported and arranged in a working environment through a bracket, the temperature sensor is arranged at an interval between the thermal infrared imager and the temperature sensor and is positioned in the visual range of the thermal infrared imager, a calibration panel is arranged on one side of the temperature sensor, which faces the thermal infrared imager, in a close fit manner, and the temperature sensor is connected with the embedded module through a sensor data line; by adopting the temperature sensor with high emissivity to replace a blackbody radiation source for the calibration of the conventional thermal infrared imager, the system complexity is reduced, the system cost and the system accumulated error are reduced, the actual calibration effect reaches the mainstream blackbody calibration level, and the online real-time dynamic calibration can be realized by replacing a blackbody in a working environment.
Description
Technical Field
The invention relates to the field of thermal infrared imager temperature measurement, in particular to a real-time calibration device for a thermal infrared imager.
Background
The infrared thermal imaging temperature measurement technology is one of the high and new technologies which are rapidly developed at present, and has the excellent characteristic in the aspect of measuring the surface temperature of an object in real time without contact. When the thermal infrared imager measures temperature, the measurement precision is influenced by parameters such as the emissivity of the surface of a measured object, the measurement distance, the ambient temperature, the service life and the like; in order to realize the accurate measurement of the temperature by the thermal infrared imager, the thermal infrared imager needs to be calibrated. The current thermal infrared imager calibration method is to calibrate a certain number of black bodies with known temperature under a set environmental condition.
The integrity of the black body as a parameter basis does not change much, but the development of the thermal infrared imager is fast, so that the calibration of the thermal infrared imager requires the black body to be raised from a single form to be distributed in an array, and the requirement on the sensitivity is correspondingly improved by several orders of magnitude. The black body is a reference source for calibrating an infrared system, the spectral energy of the black body can be obtained through calculation, and the black body is a standard source for calibrating an infrared point type thermometer, a linear scanning thermometer and a thermal imager in industry, laboratories, scientific research and national defense. However, in an actual application scenario, in order to accurately measure the temperature, particularly under the condition of a large outdoor environment temperature variation range, the thermal infrared imager needs to be calibrated on line in real time, and currently, a portable black body is commonly used as a calibration heat source, so that the method has the defect that the cost is too high and synchronous on-line calibration with the thermal infrared imager cannot be realized.
According to the thermal radiation theory and the temperature measurement principle of the thermal infrared imager, based on the Stefan-Boltzmann law, the black body is a standard heat source with the emissivity of 1, and the thermal infrared imager can be calibrated by replacing the black body with a material with high emissivity. Thus, implementing a thermal infrared imager by replacing a standard black body with a material of fixed distance and known emissivity would likely reduce the cost of the thermal infrared imager. Meanwhile, the online synchronous calibration of the thermal infrared imager can be accurately and effectively realized by measuring the ambient temperature and the temperature of the calibration surface in real time.
Disclosure of Invention
In order to solve the defects and shortcomings in the prior art, the thermal infrared imager is calibrated on line by taking the surface temperature of a temperature sensor with known emissivity as a calibration surface and utilizing the surface temperature of the temperature sensor measured by the thermal infrared imager, the temperature obtained by the sensor, the emissivity of the calibration surface and the detection distance according to the thermal radiation theory and the temperature measurement principle of the thermal infrared imager and based on the Steven-Boltzmann law, and the specific invention contents are as follows:
a real-time calibrating device for thermal infrared imager characterized in that: the device comprises a thermal infrared imager, a temperature sensor, a calibration panel, a sensor data line and an embedded module; the infrared thermal imager is characterized in that an embedded module is fixedly arranged on one side, away from the temperature sensor, of the infrared thermal imager, the embedded module and the temperature sensor are respectively arranged in a working environment through support supports, the infrared thermal imager and the temperature sensor are arranged at intervals, the temperature sensor is located in the visual range of the infrared thermal imager, a calibration panel is arranged on one side, facing the infrared thermal imager, of the temperature sensor in a clinging mode, and the temperature sensor is connected with the embedded module through a sensor data line.
Further, the thermal infrared imager is any one of an infrared point type thermometer, a linear scanning thermometer and a thermal imager.
Furthermore, the surface of the calibration panel for measuring the emissivity at the initial stage is coated with a high-emissivity coating or a high-emissivity heat conduction flat plate.
Further, in the calibration process of the specified position in the working environment, the distance between the thermal infrared imager and the temperature sensor is relatively fixed.
Further, the distance between the thermal infrared imager and the temperature sensor can be adjusted to realize the calibration process of different positions in the working environment.
Furthermore, the embedded module and the temperature sensor can be connected in a wireless mode.
Further, the calibration panel is integrated with a temperature sensor.
Compared with the prior art, the invention has the following beneficial effects:
1) according to the invention, the temperature sensor with high emissivity is adopted to replace a blackbody radiation source for calibration of a conventional thermal infrared imager, so that the system complexity is reduced, the system cost and the system accumulated error are reduced, the actual calibration effect reaches the mainstream commercial blackbody calibration level, and online real-time dynamic calibration can be realized by replacing a blackbody in a working environment.
2) According to the invention, the temperature sensor is used as a calibration material of the thermal infrared imager, and environmental temperature data are collected at the same time, so that the temperature sensor is used as a reference temperature for calibrating the thermal infrared imager and is also used as the environmental temperature of the thermal infrared imager to realize the calibration of the thermal infrared imager, and the calibration precision of the thermal infrared imager is further improved.
3) According to the invention, the thermal infrared imager and the temperature sensor are used for synchronous measurement and calibration, so that the on-line calibration of the thermal infrared imager can be realized, the influence of parameters such as environment temperature, gas concentration, startup working time and service life of the thermal infrared imager in the measurement process is reduced, and the precision of the system, especially the measurement precision under severe environment conditions, is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 1-thermal infrared imager, 2-temperature sensor, 3-calibration panel, 4-sensor data line and 5-embedded module.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and will therefore make the scope of the invention more clearly and clearly defined.
As shown in fig. 1, the thermal infrared imager 1 in this embodiment includes an FLIR Neutrino thermal imaging chip with a resolution of 640 × 512, and the data of the thermal infrared imager 1 is read by the Arm embedded module 5; the temperature sensor adopts a WZPT type contact PT100 temperature sensor, the measurement precision is plus or minus (0.15+0.002| t |), a flat plate material subjected to aluminum oxide blackening treatment is adopted as a calibration panel, and the emissivity of the calibration panel is initially measured to be 0.95; the temperature sensor 2 is directly in close contact with the calibration surface to measure the temperature of the calibration surface, the temperature sensor 2 is directly connected with the embedded module 5 through the sensor data line 4, and the embedded module 5 reads the measurement result of the temperature sensor 2 through the sensor data line 4.
Specifically, the thermal infrared imager 1 and the embedded module 5 form an infrared thermal imaging system, the temperature sensor 2 is mounted on a support, the emissivity of the calibration panel 3 and the distance value between the thermal infrared imager 1 and the temperature sensor 2 are input into the embedded module 5, the thermal infrared imager 1 directly collects a temperature value T1 on the calibration panel 3 close to the temperature sensor 2, meanwhile, the embedded module 5 obtains a temperature value T2 of the calibration panel 3 collected by the temperature sensor 2 through transmission of a sensor data line 4, the temperature value is used as an ambient temperature value T3 (namely, T3 is T2), a calibration model in the embedded module 5 is brought into and calculates a calibration value in real time according to parameters such as the emissivity, the measurement distance, the calibration panel temperatures T1 and T2 collected by the thermal infrared imager 1 and the temperature sensor 2, and the ambient temperature T3, so as to realize online real-time dynamic calibration of the thermal infrared imager, i.e. based on stevens-bauzmann law, the radiation flux R set in the calibration model in the embedded module 5 is a functional model with respect to emissivity e, measured distance d, calibration panel temperatures T1, T2, and ambient temperature T3.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. A real-time calibrating device for thermal infrared imager characterized in that: the device comprises a thermal infrared imager (1), a temperature sensor (2), a calibration panel (3), a sensor data line (4) and an embedded module (5); wherein, the fixed embedded module (5) that is provided with in one side that keeps away from temperature sensor (2) of thermal infrared imager (1), embedded module (5) and temperature sensor (2) set up in operational environment through the support respectively, thermal infrared imager (1) and temperature sensor (2) interval set up and temperature sensor (2) are located the visual within range of thermal infrared imager (1), it is provided with calibration panel (3) to hug closely in one side of temperature sensor (2) towards thermal infrared imager (1), temperature sensor (2) are connected with embedded module through sensor data line (4).
2. The real-time calibration device for thermal infrared imagers according to claim 1, characterized in that: the thermal infrared imager (1) is any one of an infrared point type thermometer, a linear scanning thermometer or a thermal imager.
3. The real-time calibration device for thermal infrared imagers according to claim 1, characterized in that: the calibration panel (3) is a surface coating with high emissivity or a heat conduction flat plate with high emissivity, and the surface coating with high emissivity is used for measuring the emissivity in the initial stage.
4. The real-time calibration device for thermal infrared imagers according to claim 1, characterized in that: in the calibration process of the specified position in the working environment, the distance between the thermal infrared imager (1) and the temperature sensor (2) is relatively fixed.
5. The real-time calibration device for thermal infrared imagers according to claim 1, characterized in that: the distance between the thermal infrared imager (1) and the temperature sensor (2) can be adjusted to realize the calibration process of different positions in the working environment.
6. The real-time calibration device for thermal infrared imagers according to claim 1, characterized in that: the embedded module (5) and the temperature sensor (2) can be connected in a wireless mode.
7. The real-time calibration device for thermal infrared imagers according to claim 1, characterized in that: the calibration panel (3) and the temperature sensor (2) are integrated into a whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010126404.0A CN111272289A (en) | 2020-02-27 | 2020-02-27 | Real-time calibration device for thermal infrared imager |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010126404.0A CN111272289A (en) | 2020-02-27 | 2020-02-27 | Real-time calibration device for thermal infrared imager |
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| CN111272289A true CN111272289A (en) | 2020-06-12 |
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| CN202010126404.0A Pending CN111272289A (en) | 2020-02-27 | 2020-02-27 | Real-time calibration device for thermal infrared imager |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112393808A (en) * | 2020-11-23 | 2021-02-23 | 江苏镭博智能科技有限公司 | Temperature compensation method and system for thermal camera |
| CN112504463A (en) * | 2020-10-29 | 2021-03-16 | 北京全路通信信号研究设计院集团有限公司 | Temperature measurement system and temperature measurement method thereof |
| CN113008381A (en) * | 2021-03-15 | 2021-06-22 | 东莞先导先进科技有限公司 | Thermal infrared imager device and real-time temperature calibration method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101183026A (en) * | 2007-11-16 | 2008-05-21 | 中华人民共和国中山出入境检验检疫局 | Infrared temperature measurement online self-calibrating equipment and method thereof |
| US9046416B2 (en) * | 2010-06-01 | 2015-06-02 | Eads Deutschland Gmbh | Device for the radiometric calibration of infra-red measuring devices |
| CN105716723A (en) * | 2016-04-05 | 2016-06-29 | 中国计量学院 | Device and method for improving temperature measuring precision of industrial site thermal imager |
| CN108254084A (en) * | 2018-01-18 | 2018-07-06 | 武汉格物优信科技有限公司 | Scaling method and calibration system in a kind of thermal infrared imager production |
-
2020
- 2020-02-27 CN CN202010126404.0A patent/CN111272289A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101183026A (en) * | 2007-11-16 | 2008-05-21 | 中华人民共和国中山出入境检验检疫局 | Infrared temperature measurement online self-calibrating equipment and method thereof |
| US9046416B2 (en) * | 2010-06-01 | 2015-06-02 | Eads Deutschland Gmbh | Device for the radiometric calibration of infra-red measuring devices |
| CN105716723A (en) * | 2016-04-05 | 2016-06-29 | 中国计量学院 | Device and method for improving temperature measuring precision of industrial site thermal imager |
| CN108254084A (en) * | 2018-01-18 | 2018-07-06 | 武汉格物优信科技有限公司 | Scaling method and calibration system in a kind of thermal infrared imager production |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112504463A (en) * | 2020-10-29 | 2021-03-16 | 北京全路通信信号研究设计院集团有限公司 | Temperature measurement system and temperature measurement method thereof |
| CN112393808A (en) * | 2020-11-23 | 2021-02-23 | 江苏镭博智能科技有限公司 | Temperature compensation method and system for thermal camera |
| WO2022104816A1 (en) * | 2020-11-23 | 2022-05-27 | 江苏镭博智能科技有限公司 | Temperature compensation method and system for thermal camera |
| CN113008381A (en) * | 2021-03-15 | 2021-06-22 | 东莞先导先进科技有限公司 | Thermal infrared imager device and real-time temperature calibration method thereof |
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