CN113008381A - Thermal infrared imager device and real-time temperature calibration method thereof - Google Patents
Thermal infrared imager device and real-time temperature calibration method thereof Download PDFInfo
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- CN113008381A CN113008381A CN202110277945.8A CN202110277945A CN113008381A CN 113008381 A CN113008381 A CN 113008381A CN 202110277945 A CN202110277945 A CN 202110277945A CN 113008381 A CN113008381 A CN 113008381A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000003331 infrared imaging Methods 0.000 claims abstract description 6
- 238000003384 imaging method Methods 0.000 claims description 12
- 238000001931 thermography Methods 0.000 claims description 12
- 230000002093 peripheral effect Effects 0.000 claims description 11
- 239000000126 substance Substances 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 5
- 238000002310 reflectometry Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000005457 Black-body radiation Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003292 glue Substances 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
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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
- G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
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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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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
The invention discloses a thermal infrared imager device which comprises an infrared lens, a lens bracket and an infrared detector chip, wherein the infrared lens is sleeved at the front end of the lens bracket, and a frame body at the rear end of the lens bracket covers the infrared detector chip; the non-light-transmitting area of a diaphragm blade or a lens support in the middle of the infrared lens is coated with a black high-emissivity material, the infrared imaging height of the infrared lens after being shielded by the black high-emissivity material is less than 1/2 of the diagonal length of the infrared detector chip, and the part shielded by the black high-emissivity material is imaged on the dark corner of the infrared detector chip. The thermal infrared imager device is simple in structure, small in size and capable of achieving real-time temperature adjustment, and the real-time temperature correction method is simple and convenient to operate and high in operability and can achieve real-time temperature adjustment of the thermal infrared imager.
Description
Technical Field
The invention relates to the field of infrared detection, in particular to a thermal infrared imager device and a temperature real-time calibration method thereof.
Background
At present, an existing infrared imager is calibrated by adopting an external black body radiation source or a temperature sensor, and the accumulated temperature error is large due to the fact that the calibrated position and frequency are different from those of an actual person or object by space and time; and the real-time calibration can accurately obtain the actual temperature of the tested person or object.
In the prior art, a real-time calibration device of a thermal infrared imager exists, and the device comprises the thermal infrared imager, a temperature sensor, a calibration panel, a sensor data line and an embedded module; 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 closely attached to one side of the temperature sensor, which faces the thermal infrared imager, 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 complexity of the system is reduced, the cost and the error are reduced, and the online real-time dynamic calibration can be realized by replacing a blackbody in a working environment. However, the solution needs to adopt a temperature sensor, a calibration panel, a sensor data line and an embedded module, so that the whole system is still complex, the cost of the system is still high, and the time interval for calibration by adopting the system is long, so that the accumulated temperature error is large.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings in the background technology, provide the thermal infrared imager device which is simple in structure and small in size and can realize real-time temperature adjustment, and provide the real-time temperature calibration method of the thermal infrared imager device which is simple and convenient to operate, strong in operability and capable of realizing real-time temperature adjustment of the thermal infrared imager.
In order to achieve the above purpose, the invention adopts the following technical scheme:
an infrared thermal imager device comprises an infrared lens, a lens support and an infrared detector chip, wherein the infrared lens is sleeved at the front end of the lens support, and a frame body at the rear end of the lens support covers the infrared detector chip; the non-light-transmitting area of a diaphragm blade or a lens support in the middle of the infrared lens is coated with a black high-emissivity material, the infrared imaging height of the infrared lens after being shielded by the black high-emissivity material is less than 1/2 of the diagonal length of the infrared detector chip, and the part shielded by the black high-emissivity material is imaged on the dark corner of the infrared detector chip.
Preferably, the infrared detector chip is arranged on the circuit board, and the lens support is fixed on the circuit board.
Preferably, the device further comprises an amplifying circuit comprising a readout circuit, an image processor and an output connector.
As a general inventive concept, there is also provided a real-time temperature calibration method for a thermal infrared imager device, in which a black high-emissivity substance is coated on a non-light-transmission region of a lens holder or a diaphragm blade in the middle of an infrared lens of the thermal infrared imager, the coated black high-emissivity substance divides an image of an infrared detector chip into a middle region and a peripheral region, the middle region is an infrared visible range, thermal imaging is performed by using the infrared visible range of the middle region, and real-time temperature calibration is performed by using a black high-emissivity material of the peripheral region.
Preferably, the real-time temperature calibration method comprises the following steps:
(a) imaging the visible range of the infrared lens by adopting the middle area of the infrared detector chip;
(b) imaging the black high-reflectivity material on the non-light-transmission area of the diaphragm blade or the lens support by using the peripheral area of the infrared detector chip;
(c) reading out and amplifying the digital signal of the infrared detector chip;
(d) processing the amplified digital signal to obtain an amplified image signal;
(e) and processing the amplified image signals by an image algorithm built in the thermal infrared imager device to realize that the image signals in the middle area of the infrared detector chip are used for infrared temperature measurement, and the image signals in the surrounding area of the infrared detector chip are used for temperature real-time calibration.
Preferably, an infrared image of a standard black body with a specific ambient temperature is given as a temperature image reference during algorithm or image processing, and the image signal of temperature real-time calibration is compared by using the infrared image of the standard black body with the ambient temperature as the temperature image reference to obtain a real-time infrared thermal imaging reference point.
Preferably, the image processor obtains the real-time calibrated temperature by comparing the read real-time acquired infrared thermal imaging picture to be calibrated with the temperature image reference standard.
Preferably, the non-light-passing area of the diaphragm blade or the lens support (2) in the middle of the infrared lens is coated with a high-emissivity material on the side close to the infrared detector chip.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, black high-emissivity materials are coated on the diaphragm blade in the middle of the infrared lens or the non-light-transmission area of the lens support to replace a black body radiation source or a temperature sensor for calibrating the infrared thermometer, the image in the middle is used for infrared temperature measurement, and the image on the periphery is used for real-time temperature calibration, so that the thermal infrared imager device which is compact in structure, ingenious in conception and capable of carrying out real-time temperature calibration is obtained, the complexity of the system is reduced, the hardware cost and the accumulated error of the system are reduced, and the real-time dynamic temperature calibration can be realized by replacing the black body radiation source or the temperature sensor in the actual working environment.
2. The calibration method of the thermal infrared imager device is convenient to use and simple to operate, and can realize temperature measurement imaging and real-time dynamic temperature calibration of the thermal infrared imager.
Drawings
Fig. 1 is an exploded schematic view of a thermal infrared imager device.
FIG. 2 is a schematic diagram of a diaphragm blade coated with black high-reflectivity material in the middle of an infrared lens.
FIG. 3 is a schematic view of a thermal infrared imager device coated with a black high emissivity material.
Fig. 4 is a schematic diagram of imaging and calibration principles of the thermal infrared imager device.
Fig. 5 is an infrared imaging photoelectric diagram of the infrared thermal imager device.
Description of the drawings:
1. an infrared lens; 2. a lens holder; 3. an infrared detection chip; 4. a circuit board; 5. an amplifying circuit including a readout circuit; 6. an image processor; 7. and an output connector.
Detailed Description
The present invention will be further described with reference to the following specific examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
The embodiment provides a thermal infrared imager device, as shown in fig. 1 and 3, which includes an infrared lens 1, a lens holder 2 and an infrared detector chip 3, where the infrared lens 1 is sleeved at the front end of the lens holder 2, a frame body at the rear end of the lens holder 2 covers (covers) the infrared detector chip 3, a black high-emissivity material H is coated on a side, close to the infrared detector chip 3, of a diaphragm blade L in the middle of the infrared lens 1 (as shown in fig. 2), and/or a black high-emissivity material H is coated on a non-light-transmitting area (outside of a square frame area of the lens holder 2) on the side, close to the infrared detector chip 3, of the lens holder 2, the middle of the diaphragm blade L is a light-transmitting diaphragm of the infrared lens 1, and a black high-emissivity material H is coated on a shadow portion (facing the infrared detector side; or the outer area of the square frame, close to the infrared detector chip 3, on the infrared lens support 2 is coated with a black high-emissivity material H. And the imaging height of the infrared lens 1 after being shielded by the black high-emissivity material H is smaller than 1/2 length of the diagonal line of the imaging area of the infrared detector chip 3, and the part shielded by the black high-emissivity material is imaged on the dark corner of the infrared detector chip 3 (the dark corner is the area outside the infrared visible imaging range on the infrared detector chip 3), that is, the black high-emissivity material covers the part outside the infrared thermal image area of the infrared detector chip 3.
The thermal infrared imager further comprises a circuit board 4, the infrared detector chip 3 is arranged on the circuit board 4, and the lens support 2 is adhered to the circuit board 4 through glue.
The thermal infrared imager device also comprises an amplifying circuit 5 comprising a reading circuit, an image processor 6 and an output connector 7, wherein the image processor 6 converts signals read and amplified by the thermal infrared detector chip into image signals representing temperature high and low points which can be output on a display screen; the output connector 7 can be connected with a display screen to output image signals representing different color shades of high and low temperature.
The embodiment also provides a real-time temperature calibration method for the thermal infrared imager device, wherein a black high-emissivity substance is coated on one side, close to the infrared detector chip 3, of a diaphragm blade L in the middle of an infrared lens 1 or a non-light-transmission area (on a square frame of a lens support 2) of the lens support 2 of the thermal infrared imager device, the black high-emissivity substance is coated to divide an image of the infrared detector chip 3 into a middle area and a peripheral area, the middle area is an infrared visible area, thermal imaging is performed by using the infrared visible area of the middle area, and real-time temperature calibration is performed on the thermal infrared imager device by using a black high-emissivity material H of the peripheral area.
The working principle schematic diagram of the real-time temperature calibration method of the thermal infrared imager device is shown in FIG. 4, signals of an infrared detector chip 3 are read and amplified through an amplifying circuit 5 with a reading circuit, then are subjected to image processing through an image processor 6, and then are output to a display through an output connector 7 for displaying; the image processor 6 converts the digital signal of the reading and amplifying circuit into a video signal with different color shades representing the temperature, and comprises the following steps:
(a) imaging the infrared visible range of the infrared lens 1 by adopting the middle area of the infrared detector chip 3;
(b) imaging a black high-reflectivity material H on a non-light-transmission area (namely an area outside a square frame of the lens support 2) or a diaphragm blade L of the lens support 2 by utilizing a peripheral area (edge area) of the infrared detector chip 3;
(c) reading the digital signal of the infrared detector chip 3 through an amplifying circuit 5 containing a reading circuit;
(d) the image processor 6 reads out the digital signal of the amplifying circuit 5 including the readout circuit to process and output an image signal;
(e) an image algorithm built in the thermal infrared imager device processes the amplified image signals, so that the image signals in the middle area of the infrared detector chip 3 are used for infrared temperature measurement, and the image signals in the surrounding area (edge area) of the infrared detector chip 3 are used for temperature real-time calibration.
Preferably, the infrared image of the standard black body with a specific environment temperature is used as a temperature image reference datum in algorithm or image processing, and the image signal of temperature real-time calibration is compared by using the infrared image of the standard black body with the environment temperature as the temperature image reference datum to obtain a real-time infrared thermal imaging reference point.
Preferably, the image processor 6 reads an infrared thermal imaging picture for real-time calibration in a memory card of the thermal infrared imager and compares the infrared thermal imaging picture with the temperature image reference standard to obtain a real-time temperature.
The image area of the infrared detector is divided by the diaphragm blade L of the infrared lens 1 or the square frame of the lens holder 2 into a central area and a peripheral area (the peripheral area means an area other than the central area, that is, an edge area).
In the invention, the height of an image formed by the infrared lens 1 on a detected target is less than 1/2 length of a diagonal line of an imaging area of the infrared detector chip 3, and the dark corner of the image is used for automatic real-time temperature calibration.
An infrared imaging schematic diagram of the thermal infrared imager is shown in fig. 4, infrared light of the environment passes through an infrared lens 1, an image signal is formed on an infrared detector chip 3, a weak image signal of the infrared detector chip is read through a reading circuit, the weak image signal is amplified through a preposed amplifying circuit, and the signal after infrared thermal imaging amplification is converted into an image signal which can represent temperature and has different color depths and can be output on a display screen after the signal is processed by an image processor 3 (image algorithm software reads an infrared thermal imaging picture for real-time calibration in a flash memory card or a memory card of the thermal infrared imager through a set path and compares the infrared thermal imaging picture with a reference standard for temperature image to obtain real-time temperature).
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (8)
1. The thermal infrared imager device is characterized by comprising an infrared lens (1), a lens support (2) and an infrared detector chip (3), wherein the infrared lens (1) is sleeved at the front end of the lens support (2), and a frame body at the rear end of the lens support (2) covers the infrared detector chip (3); the non-light-transmitting area of a diaphragm blade or a lens support (2) in the middle of the infrared lens (1) is coated with a black high-emissivity material, the infrared imaging height of the infrared lens (1) which is shielded by the black high-emissivity material is less than 1/2 of the diagonal length of the infrared detector chip (3), and the part shielded by the black high-emissivity material is imaged on the dark corner of the infrared detector chip (3).
2. The thermal infrared imager device according to claim 1, further comprising a circuit board (4), wherein said infrared detector chip (3) is disposed on said circuit board (4), and said lens holder (2) is fixed on said circuit board (4).
3. The thermal infrared imager device according to claim 2, characterized in that it further comprises an amplification circuit (5) comprising a read-out circuit, an image processor (6) and an output connector (7).
4. The real-time temperature calibration method of the thermal infrared imager device is characterized in that a diaphragm blade in the middle of an infrared lens (1) of the thermal infrared imager or a non-light-transmitting area of a lens support (2) is coated with a black high-emissivity substance, the coated black high-emissivity substance divides an image of an infrared detector chip (3) into a middle area and a peripheral area, the middle area is an infrared visible range, thermal imaging is carried out by utilizing the infrared visible range of the middle area, and real-time temperature calibration is carried out by utilizing a black high-emissivity material of the peripheral area.
5. The method for real-time temperature calibration of a thermal infrared imager device according to claim 4, comprising the steps of:
(a) imaging the visible range of the infrared lens (1) by adopting the middle area of the infrared detector chip (3);
(b) imaging a black high-reflectivity material on a non-light-transmission area of the diaphragm blade or the lens support (2) by using a peripheral area of the infrared detector chip (3);
(c) reading out and amplifying the digital signal of the infrared detector chip (3);
(d) processing the amplified digital signal to obtain an amplified image signal;
(e) an image algorithm built in the thermal infrared imager device processes the amplified image signals, so that the image signals in the middle area of the infrared detector chip (3) are used for infrared temperature measurement, and the image signals in the surrounding area of the infrared detector chip (3) are used for temperature real-time calibration.
6. The method for real-time calibration of temperature of thermal infrared imager device as claimed in claim 5, characterized in that the infrared image of a standard black body with a specific ambient temperature is given as a temperature image reference during the algorithm or image processing, and the image signal of the real-time temperature calibration is compared by using the infrared image of the standard black body with the ambient temperature as the temperature image reference to obtain a real-time infrared thermography reference temperature reference point.
7. The method for real-time calibration of the temperature of a thermal infrared imager device according to claim 6, characterized in that the image processor (6) derives the real-time calibrated temperature by comparing the read real-time acquired thermal infrared imaging picture to be calibrated with the temperature image reference standard.
8. The method for real-time temperature calibration of a thermal infrared imager device according to any of the claims 4-7, characterized in that the non-light-transmitting areas of the diaphragm blades or lens holders (2) in the middle of the infrared lens (1) are coated with a high-emissivity material on the side close to the infrared detector chip (3).
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| CN202110277945.8A CN113008381B (en) | 2021-03-15 | 2021-03-15 | Thermal infrared imager device and real-time temperature calibration method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117853538A (en) * | 2023-04-26 | 2024-04-09 | 无锡英菲感知技术有限公司 | Infrared image calibration method, device, equipment and readable storage medium |
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