CN112229523A - Infrared thermal imaging temperature measurement method and device - Google Patents
Infrared thermal imaging temperature measurement method and device Download PDFInfo
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- 238000001931 thermography Methods 0.000 title claims abstract description 89
- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005457 Black-body radiation Effects 0.000 claims abstract description 27
- 238000011088 calibration curve Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000036760 body temperature Effects 0.000 abstract description 2
- 230000005855 radiation Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 208000035473 Communicable disease Diseases 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006806 disease prevention Effects 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
- G01J5/0022—Radiation pyrometry, e.g. infrared or optical thermometry for sensing the radiation of moving bodies
- G01J5/0025—Living bodies
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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
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
-
- 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
- G01J5/52—Radiation pyrometry, e.g. infrared or optical thermometry using comparison with reference sources, e.g. disappearing-filament pyrometer
- G01J5/53—Reference sources, e.g. standard lamps; Black bodies
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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 an infrared thermal imaging temperature measurement method and device, and belongs to the technical field of infrared temperature measurement. The infrared thermal imaging temperature measuring device provided by the invention comprises an infrared thermal imaging camera, a reference body, a temperature sensor, a temperature measuring instrument and a data processor. The infrared thermal imaging temperature measuring device uses the reference body, the temperature sensor and the temperature measuring instrument to replace a black body radiation source in the existing infrared thermal imaging temperature measuring device, the temperature of the reference body is measured by using the high-precision temperature sensor and the temperature measuring instrument, the actual temperature of the surface of the reference body is transmitted to the data processor, the infrared thermal imaging temperature measuring device is corrected in real time, and the human body temperature measuring precision of +/-0.1 ℃ can be realized. The infrared thermal imaging temperature measuring device provided by the invention does not need to use a black body radiation source with high price, greatly reduces the cost of the infrared thermal imaging temperature measuring device, and effectively solves a series of practical problems of high cost, large volume, complex use and maintenance and the like of the conventional infrared thermal imaging temperature measuring method and device.
Description
Technical Field
The invention relates to an infrared thermal imaging temperature measurement method and device, and belongs to the technical field of infrared temperature measurement.
Background
The infrared thermal imaging temperature measurement system can be used for rapidly identifying people with the surface temperature exceeding a certain specific temperature in the stream of people due to the characteristics of long distance, non-contact, multiple targets, high precision and the like, and plays an important role in the prevention and control of epidemic infectious diseases.
In all objects in nature with a temperature higher than absolute zero (-273.15 ℃), electromagnetic waves including infrared bands are radiated to the surrounding space ceaselessly due to the thermal motion of molecules, and the radiation energy density is in direct proportion to the 4 th power of the temperature of the object. Small temperature changes cause significant radiant energy changes and thus the sensitivity of measuring the temperature of an object using infrared radiation is high.
The infrared thermal imaging camera can receive the thermal radiation of the measured object under the condition of not contacting the measured object and convert the surface temperature of the north object. Because the heat radiation actually entering the infrared thermal imaging camera not only has the self radiation of a target, but also reflects the heat radiation and atmospheric radiation of the environment, the method for directly using the infrared thermal imaging camera to measure the temperature is influenced by a plurality of factors, and the temperature measurement precision is only +/-1 ℃.
In order to better eliminate the influence of environment and atmospheric radiation on the measurement accuracy, an external blackbody radiation source is added to an existing infrared thermal imaging temperature measurement system in the visual field range of an infrared thermal imaging camera to serve as a reference temperature point of an infrared thermal imager, and the measurement temperature is corrected in real time, and the system can improve the measurement accuracy of the human body temperature to +/-0.3 ℃ as shown in figure 1, so that the temperature screening requirement of epidemic infectious disease prevention and control is met.
The blackbody radiation source is a standard temperature transfer device specially used for calibrating and testing the performance of an infrared temperature measuring instrument. The blackbody radiation source consists of a constant temperature cavity, a heating and cooling element, a temperature measuring sensor, a PID temperature controller and the like. The actual temperature of the blackbody radiation source is obtained through the temperature measuring sensor, the signal is transmitted to the PID temperature controller, the PID temperature controller can amplify and convert the temperature signal, the temperature signal is analyzed and compared through the internal microcomputer to generate a control signal, the signal is converted, the power circuit and the heating and cooling element are controlled to heat or cool the constant-temperature cavity, the adjustment of the working temperature of the blackbody radiation source is completed, and the accuracy of +/-0.01 ℃ and the stability of +/-0.01 ℃/30 minutes are achieved. Therefore, the cost of the blackbody radiation source is higher than that of the infrared thermal imaging camera, so that the cost of the existing infrared thermal imaging temperature measurement system is high.
Disclosure of Invention
The invention aims to provide an infrared thermal imaging temperature measurement method and device, which improve the existing infrared thermal imaging temperature measurement device, do not need to use a black body radiation source, and use a reference body, a temperature sensor and a temperature measurement instrument to replace the black body radiation source in the existing infrared thermal imaging temperature measurement device so as to reduce the temperature measurement cost.
The invention provides an infrared thermal imaging temperature measurement method, which comprises the following steps:
(1) calibrating the infrared thermal imaging camera by using a standard black body radiation source, namely when the black body radiation source is measured at different temperatures, acquiring the gray values of video images corresponding to the different temperatures from the black body radiation source by using the infrared thermal imaging camera, establishing a relation curve of the temperature of the black body radiation source and the gray values of the video images to obtain a temperature-gray scale calibration curve of the infrared thermal imaging camera, and storing the temperature-gray scale calibration curve into a data processor;
(2) the infrared thermal imaging camera respectively obtains the video images of the measured object and the reference object, and outputs the gray value G of the measured object corresponding to the video images of the measured object and the reference objectmAnd a reference volume gray value GcAnd the gray value G of the measured object is measuredmAnd a reference volume gray value GcSending to a data processor;
(3) the temperature sensor measures the temperature T of the reference bodycAnd measuring the temperature T of the reference bodycSending to a data processor;
(4) the data processor reads the gray value G of the measured object from the infrared thermal imaging cameramAnd a reference volume gray value GcAnd calculating the gray difference delta G between the gray value of the measured object and the gray value of the reference object, wherein delta G is Gm-Gc；
(5) Converting the gray level difference delta G in the step (4) into a temperature difference delta T by the data processor according to the temperature-gray level calibration curve of the infrared thermal imaging camera in the step (1);
(6) the data processor measures the temperature T from a reference body measured by the temperature sensorcAnd (5) calculating the temperature difference delta T to obtain the actual temperature value T of the surface of the measured objectm，Tm＝Tc+ΔT。
The invention provides an infrared thermal imaging temperature measuring device, which comprises:
the infrared thermal imaging camera is used for converting infrared rays emitted by the measured object, the reference object and the surrounding environment background into video images of the measured object and the reference object and transmitting the video images of the measured object and the reference object to the data processor through the network interface;
reference body: the infrared thermal imaging temperature measuring device is used for providing reference temperature of a measured object for the infrared thermal imaging temperature measuring device;
a temperature sensor: the temperature measuring device is used for converting the temperature of the reference body into an analog electric signal and transmitting the analog temperature signal to the temperature measuring instrument through a lead;
a temperature measuring instrument: the temperature sensor is used for converting the analog signal output by the temperature sensor into a digital signal and transmitting the digital signal to the data processor through the RS485 interface;
a data processor: the system is used for calculating, processing and displaying the measurement data of the infrared thermal imaging camera, extracting the gray value of a measured object and the gray value of a reference object from a video image output by the infrared thermal imaging camera, and calculating the gray difference between the measured object and the reference object; then obtaining the temperature difference between the surface of the measured object and the surface of the reference object according to the gray-temperature conversion curve; and finally, adding the temperature difference and a reference body temperature measurement value output by the temperature measuring instrument, calculating to obtain an actual temperature measurement value of the surface of the measured object, and displaying the actual temperature measurement value on the measured object in the video image.
The infrared thermal imaging temperature measurement method and the device provided by the invention have the advantages that:
according to the infrared thermal imaging temperature measurement method and device, the reference body, the temperature sensor and the temperature measurement instrument are used for replacing a black body radiation source in the existing infrared thermal imaging temperature measurement device, the black body radiation source is not needed, the temperature of the reference body is measured by the high-precision temperature sensor and the temperature measurement instrument, the actual temperature of the surface of the reference body is transmitted to a computer in the infrared thermal imaging temperature measurement device, the infrared thermal imaging temperature measurement device is corrected in real time, and the human body temperature measurement precision of +/-0.1 ℃ can be realized. Because the infrared thermal imaging temperature measuring device does not need to use a constant-temperature black body radiation source, the cost of the infrared thermal imaging temperature measuring device is greatly reduced, and a series of practical problems of high cost, large volume, complex use and maintenance and the like of the conventional infrared thermal imaging temperature measuring method and device are effectively solved.
Drawings
Fig. 1 is a schematic structural diagram of a conventional infrared thermal imaging temperature measuring device.
FIG. 2 is a block diagram of a flow chart of an infrared thermal imaging temperature measurement method according to the present invention.
Fig. 3 is a schematic structural diagram of an infrared thermal imaging temperature measuring device provided by the invention.
Detailed Description
The flow chart of the infrared thermal imaging temperature measurement method provided by the invention is shown in figure 2, and the method comprises the following steps:
(1) calibrating the infrared thermal imaging camera by using a standard black body radiation source, namely when the black body radiation source is measured at different temperatures, acquiring the gray values of video images corresponding to the different temperatures from the black body radiation source by using the infrared thermal imaging camera, establishing a relation curve of the temperature of the black body radiation source and the gray values of the video images to obtain a temperature-gray scale calibration curve of the infrared thermal imaging camera, and storing the temperature-gray scale calibration curve into a data processor;
(2) the infrared thermal imaging camera respectively obtains the video images of the measured object and the reference object, and outputs the gray value G of the measured object corresponding to the video images of the measured object and the reference objectmAnd a reference volume gray value GcAnd the gray value G of the measured object is measuredmAnd a reference volume gray value GcSending to a data processor;
(3) the temperature sensor measures the temperature T of the reference bodycAnd measuring the temperature T of the reference bodycIs sent to a data placeArranging a processor;
(4) the data processor reads the gray value G of the measured object from the infrared thermal imaging cameramAnd a reference volume gray value GcAnd calculating the gray difference delta G between the gray value of the measured object and the gray value of the reference object, wherein delta G is Gm-Gc；
(5) Converting the gray level difference delta G in the step (4) into a temperature difference delta T by the data processor according to the temperature-gray level calibration curve of the infrared thermal imaging camera in the step (1);
(6) the data processor measures the temperature T from a reference body measured by the temperature sensorcAnd (5) calculating the temperature difference delta T to obtain the actual temperature value T of the surface of the measured objectm，Tm＝Tc+ΔT。
The structure of the infrared thermal imaging temperature measuring device provided by the invention is shown in figure 3, and the infrared thermal imaging temperature measuring device comprises:
the infrared thermal imaging camera is used for converting infrared rays emitted by the measured object, the reference object and the surrounding environment background into video images of the measured object and the reference object and transmitting the video images of the measured object and the reference object to the data processor through the network interface;
reference body: the infrared thermal imaging temperature measuring device is used for providing reference temperature of a measured object for the infrared thermal imaging temperature measuring device;
a temperature sensor: the temperature measuring device is used for converting the temperature of the reference body into an analog electric signal and transmitting the analog temperature signal to the temperature measuring instrument through a lead;
a temperature measuring instrument: the temperature sensor is used for converting the analog signal output by the temperature sensor into a digital signal and transmitting the digital signal to the data processor through the RS485 interface;
a data processor: the system is used for calculating, processing and displaying the measurement data of the infrared thermal imaging camera, extracting the gray value of a measured object and the gray value of a reference object from a video image output by the infrared thermal imaging camera, and calculating the gray difference between the measured object and the reference object; then obtaining the temperature difference between the surface of the measured object and the surface of the reference object according to the gray-temperature conversion curve; and finally, adding the temperature difference and a reference body temperature measurement value output by the temperature measuring instrument, calculating to obtain an actual temperature measurement value of the surface of the measured object, and displaying the actual temperature measurement value on the measured object in the video image.
The infrared thermal imaging temperature measuring device shown in fig. 2 comprises an infrared thermal imaging camera, a reference body, a temperature sensor, a temperature measuring instrument and a data processor. The infrared thermal imaging camera is connected with the computer through a 10M/100M self-adaptive network port, the temperature sensor is inserted into the temperature measuring hole of the reference body and is connected with the temperature measuring instrument through a lead, and the temperature measuring instrument is connected with the data processor through an RS485 interface.
The working principle of the infrared thermal imaging temperature measuring device is as follows:
the infrared thermal imaging camera converts infrared rays emitted by a measured object, a reference object and a surrounding environment background into a visible light video image and then transmits the visible light video image to the data processor, the data processor respectively reads the gray value of the measured object and the gray value of the reference object from the video image and calculates the gray difference between the measured object and the reference object; the data processor compares the gray scale difference with a gray scale-temperature conversion curve stored in the data processor, and converts the gray scale difference between the measured object and the reference object into a temperature difference; and finally, adding the temperature difference and the reference body temperature measurement value output by the temperature measuring instrument to calculate the actual temperature measurement value of the surface of the measured object, and displaying the actual temperature measurement value on the measured object in the video image.
In one embodiment of the infrared thermal imaging temperature measuring device, a vanadium oxide non-refrigeration type detector is adopted by an infrared thermal imaging camera, and the infrared thermal imaging camera is connected with a data processor through a 10M/100M self-adaptive network port; the reference body material adopts a red copper plate with the thickness of 100mm multiplied by 100mm, uniform pits are formed on the outer surface of the reference body material by rough emery shot blasting, so that the reference body material has diffuse reflection performance, oil stain is removed after baking and high-emissivity matt black paint is sprayed after oxidation blackening treatment, and the effective emissivity of a target surface is improved; the temperature sensor adopts a platinum resistance temperature sensor; the temperature measuring instrument adopts an AI-500 type intelligent measuring and alarming instrument of Xiamen electronic automation science and technology Limited company and is connected with the data processor through an RS485 interface. The data processor used a Fuji-Kang 15-inch industrial tablet computer.
In summary, the infrared thermal imaging temperature measurement device provided by the invention uses the reference body, the temperature sensor and the temperature measurement instrument to replace a black body radiation source in the existing infrared thermal imaging temperature measurement device, measures the temperature of the reference body by using the high-precision temperature sensor and the temperature measurement instrument, transmits the actual temperature of the surface of the reference body to the data processor in the infrared thermal imaging temperature measurement device, corrects the infrared thermal imaging temperature measurement device in real time, and can realize the human body temperature measurement precision of +/-0.1 ℃. Because the infrared thermal imaging temperature measuring device does not need to use a constant-temperature black body radiation source, the cost of the infrared thermal imaging temperature measuring device is greatly reduced, and a series of practical problems of high cost, large volume, complex use and maintenance and the like of the conventional infrared thermal imaging temperature measuring method and device are effectively solved.
Claims (2)
1. An infrared thermal imaging temperature measurement method is characterized by comprising the following steps:
(1) calibrating the infrared thermal imaging camera by using a standard black body radiation source, namely when the black body radiation source is measured at different temperatures, acquiring the gray values of video images corresponding to the different temperatures from the black body radiation source by using the infrared thermal imaging camera, establishing a relation curve of the temperature of the black body radiation source and the gray values of the video images to obtain a temperature-gray scale calibration curve of the infrared thermal imaging camera, and storing the temperature-gray scale calibration curve into a data processor;
(2) the infrared thermal imaging camera respectively obtains the video images of the measured object and the reference object, and outputs the gray value G of the measured object corresponding to the video images of the measured object and the reference objectmAnd a reference volume gray value GcAnd the gray value G of the measured object is measuredmAnd a reference volume gray value GcSending to a data processor;
(3) the temperature sensor measures the temperature T of the reference bodycAnd measuring the temperature T of the reference bodycSending to a data processor;
(4) the data processor reads the gray value G of the measured object from the infrared thermal imaging cameramAnd a reference volume gray value GcAnd calculating the gray difference delta G between the gray value of the measured object and the gray value of the reference object, wherein delta G is Gm-Gc；
(5) Converting the gray level difference delta G in the step (4) into a temperature difference delta T by the data processor according to the temperature-gray level calibration curve of the infrared thermal imaging camera in the step (1);
(6) the data processor measures the temperature T from a reference body measured by the temperature sensorcAnd (5) calculating the temperature difference delta T to obtain the actual temperature value T of the surface of the measured objectm，Tm＝Tc+ΔT。
2. The utility model provides an infrared thermal imaging temperature measuring device which characterized in that this temperature measuring device includes:
the infrared thermal imaging camera is used for converting infrared rays emitted by the measured object, the reference object and the surrounding environment background into video images of the measured object and the reference object and transmitting the video images of the measured object and the reference object to the data processor through the network interface;
reference body: the infrared thermal imaging temperature measuring device is used for providing reference temperature of a measured object for the infrared thermal imaging temperature measuring device;
a temperature sensor: the temperature measuring device is used for converting the temperature of the reference body into an analog electric signal and transmitting the analog temperature signal to the temperature measuring instrument through a lead;
a temperature measuring instrument: the temperature sensor is used for converting the analog signal output by the temperature sensor into a digital signal and transmitting the digital signal to the data processor through the RS485 interface;
a data processor: the system is used for calculating, processing and displaying the measurement data of the infrared thermal imaging camera, extracting the gray value of a measured object and the gray value of a reference object from a video image output by the infrared thermal imaging camera, and calculating the gray difference between the measured object and the reference object; then obtaining the temperature difference between the surface of the measured object and the surface of the reference object according to the gray-temperature conversion curve; and finally, adding the temperature difference and a reference body temperature measurement value output by the temperature measuring instrument, calculating to obtain an actual temperature measurement value of the surface of the measured object, and displaying the actual temperature measurement value on the measured object in the video image.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049109A (en) * | 2021-03-12 | 2021-06-29 | 红相股份有限公司 | Infrared temperature measurement method based on reference blackbody and computer readable storage medium |
| CN114018324A (en) * | 2021-11-02 | 2022-02-08 | 清华大学 | Multi-parameter synchronous measurement method and device, electronic equipment and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113049109A (en) * | 2021-03-12 | 2021-06-29 | 红相股份有限公司 | Infrared temperature measurement method based on reference blackbody and computer readable storage medium |
| CN114018324A (en) * | 2021-11-02 | 2022-02-08 | 清华大学 | Multi-parameter synchronous measurement method and device, electronic equipment and storage medium |
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