CN114235157A - Thermal infrared imager with TOF sensor - Google Patents
Thermal infrared imager with TOF sensor Download PDFInfo
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- CN114235157A CN114235157A CN202111459441.4A CN202111459441A CN114235157A CN 114235157 A CN114235157 A CN 114235157A CN 202111459441 A CN202111459441 A CN 202111459441A CN 114235157 A CN114235157 A CN 114235157A
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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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
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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Abstract
The invention discloses an infrared thermal imager with a TOF sensor, which relates to the technical field of infrared thermal imagers and comprises a TOF depth camera, an infrared lens, an infrared imager body and an infrared imager display and control screen, wherein one end of the infrared imager body is provided with the infrared lens for infrared temperature detection, the TOF depth camera for TOF depth ranging is arranged above the infrared lens, one side of the infrared imager body is movably provided with the infrared imager display and control screen, and the TOF depth camera, the infrared lens and the infrared imager display and control screen are electrically connected with a controller in the infrared imager body, the distance calibration involved is a full pixel point, rather than an entire object, with greater accuracy.
Description
Technical Field
The invention relates to the technical field of thermal infrared imagers, in particular to a thermal infrared imager with a TOF sensor.
Background
At present, an infrared thermal imager is widely applied to monitoring the running state of power system equipment, the temperature distribution characteristics of the surface of the equipment are quantitatively drawn by detecting the infrared radiation of the surface of the power equipment so as to judge whether the running state of the equipment is normal, a worker can carry out charged temperature detection on the running power equipment at a safe distance by virtue of the infrared thermal imager, then an infrared spectrum and a special temperature value are displayed on an instrument interface to assist the worker in carrying out defect judgment, the detection is non-contact, the imaging is intuitive, and the electromagnetic interference resistance characteristic enables the infrared thermal imager to be an indispensable tool for monitoring the state of the power equipment, in the infrared imaging technology, an important parameter and an important distance are provided, because the infrared radiation values detected by the infrared thermal imager at different positions are different, but the detection of the temperature of a radiation source has consistency, therefore, the distance is vital to the accurate inversion of the temperature of the radiation source, at present, infrared imaging appearance and the distance of detection target are artificial settlement, through parameter setting interface, set up fixed distance parameter, for example 15m, then shoot, but in the actual detection, because the position of measurement personnel has certain randomness, the actual detection distance is difficult to accomplish and is set for the distance unanimity, practical test shows that, the detection display result that the distance is different corresponding also differs greatly, use the example that No. 2 transformer 35kV sleeve pipe C of a certain transformer substation is generated heat because of the screw is not hard up, set up the detection distance and be 5m, on-the-spot data collection as follows: the temperature measured and displayed at the position of 2m is 80 ℃, the temperature displayed by an infrared thermal imager at the position of 4m is 55 ℃, the temperature displayed by an infrared thermal imager at the position of 6m is 44 ℃, the temperature displayed by an infrared thermal imager at the position of 10m is 37 ℃, and the temperature displayed by an infrared thermal imager at the position of 15m is 36 ℃, so that the temperature detection method has the advantages that the error of the set detection distance has great influence on the accurate reduction of the temperature of a detection object, the accuracy of the temperature is very important in the judgment of the defect of the equipment, and the accurate setting of the detection distance has important significance on the defect diagnosis of the power equipment.
The common solution is to measure the temperature variation of the same heat source (i.e. power equipment) along with the distance at different distances to obtain a group of correction coefficient data of the temperature variation along with the distance, and then compare the correction coefficient data with the same reference to find out the abnormal temperature position.
Disclosure of Invention
The invention provides a thermal infrared imager with a TOF sensor, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a thermal infrared imager with TOF sensor, includes TOF degree of depth camera, infrared lens, infrared imager fuselage and infrared imager demonstration and controls the screen, the one end of infrared imager fuselage is provided with the infrared lens that is used for infrared temperature to detect, infrared lens's top is provided with the TOF degree of depth camera that is used for TOF degree of depth range finding, one side activity of infrared imager fuselage is provided with infrared imager demonstration and controls the screen, TOF degree of depth camera, infrared lens and infrared imager demonstration and control the screen and all carry out electric connection with the inside controller of infrared imager fuselage.
Furthermore, one side of the infrared imager body is provided with an infrared imager display and control screen through two movable parts of the movable shaft, and the included angle range between the infrared imager body and the infrared imager display and control screen is zero degree to ninety degrees.
Furthermore, a TOF depth sensor is arranged in the TOF depth camera, and a distance depth map of a measurement target is obtained by the TOF depth sensor, so that all pixel points in a shooting range have respective corresponding distance attributes.
Furthermore, the infrared lens and the distance detection part have completely consistent view fields, the infrared imaging part substitutes the distance attribute of each pixel point, and the temperature value of each pixel is obtained by adopting a calculation formula of radiation conversion temperature.
Further, the common method for temperature conversion of the thermal imager is as follows:
in the formula (I), the compound is shown in the specification,T ob represents the observed temperature; parameter(s)dRepresenting the distance from the measured object to the lens;T atm represents the atmospheric temperature;T o represents the ambient temperature;ωrepresents the ambient relative humidity;ε ob representing the ambient band emissivity.
Further, TOF depth ranging is carried out by using a TOF depth sensor to obtain a distance depth map, the distance depth map is used for providing data reference for the infrared lens, depth ranging parameters are substituted into a radiation conversion formula, radiation values are converted into temperature parameters, and finally temperature is identified on a display screen through pseudo color coding to obtain an infrared temperature chromatogram.
Further, the entire temperature imaging process involves three graphs: the system comprises visible light, a distance depth map and an infrared map, wherein distance parameters provided by the distance depth map correct infrared temperature conversion results, and the whole process is synchronously carried out in real time.
Compared with the prior art, the invention provides the thermal infrared imager with the TOF sensor, which has the following beneficial effects:
1. the thermal infrared imager with the TOF sensor provides accurate pixel distance parameters and ensures the accuracy of temperature identification in a test range.
2. This thermal infrared imager with TOF sensor, automatic generation apart from the depth map, remove the manual parameter of setting from, improve work efficiency.
3. According to the thermal infrared imager with the TOF sensor, the related distance is calibrated to be a full-pixel point instead of an integral object, and the precision is higher.
4. The thermal infrared imager with the TOF sensor can automatically generate a distance and depth map and provide support for filtering of a background in an intelligent spectrum analysis method.
Drawings
FIG. 1 is a schematic view of a thermal infrared imager with a TOF sensor according to the present invention;
FIG. 2 is a flow chart of the thermal infrared imager with TOF sensor according to the present invention;
FIG. 3 is a visual representation of TOF depth ranging results of the present invention;
FIG. 4 is a graph of the temperature imaging effect of the thermal infrared imager with the TOF sensor of the present invention.
In the figure: 1. a TOF depth camera; 2. an infrared lens; 3. an infrared imager body; 4. and the infrared imager displays and controls the screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-4, the invention discloses a thermal infrared imager with a TOF sensor, which comprises a TOF depth camera 1, an infrared lens 2, an infrared imager body 3 and an infrared imager display and control screen 4, wherein one end of the infrared imager body 3 is provided with the infrared lens 2 for infrared temperature detection, the TOF depth camera 1 for TOF depth ranging is arranged above the infrared lens 2, one side of the infrared imager body 3 is movably provided with the infrared imager display and control screen 4, the TOF depth camera 1, the infrared lens 2 and the infrared imager display and control screen 4 are all electrically connected with a controller in the infrared imager body 3, the thermal infrared imager with the TOF sensor is additionally provided with a TOF depth sensor of Flight on the basis of the original infrared imager temperature detection, the distance depth map of the shot object is obtained on the spot in real time, the radiation value of each pixel point is correctly converted into corresponding temperature, so that the detection personnel can obtain accurate and consistent temperature values when shooting at different distances within a specified range, and the interference of the detection distance to temperature detection is avoided.
The thermal infrared imager with the TOF sensor provides accurate pixel distance parameters, ensures the accuracy of temperature identification in a test range, automatically generates a distance depth map, removes manual parameter setting from, improves the working efficiency, calibrates the related distance to be full pixel points instead of an integral object, has higher precision, automatically generates the distance depth map, and can provide support for filtering the background in an intelligent atlas analysis method.
Specifically, one side of infrared imager fuselage 3 has infrared imager to show and control screen 4 through loose axle activity two, the contained angle scope between infrared imager fuselage 3 and the infrared imager demonstration and control screen 4 is zero degree to ninety degrees.
Specifically, a TOF depth sensor is arranged in the TOF depth camera 1, and a distance depth map of a measurement target is obtained by the TOF depth sensor, so that all pixel points in a shooting range have respective corresponding distance attributes.
Specifically, the infrared lens 2 and the distance detection part have completely consistent view fields, the infrared imaging part substitutes the distance attribute of each pixel point, the calculation formula of radiation conversion temperature is adopted, the temperature value of each pixel is obtained, and the accuracy and reliability of infrared imaging temperature detection are finally realized.
The overall working process of the thermal infrared imager with distance and depth sensing is shown in figure 2,
a first part: TOF depth ranging; TOF is short for Time of flight, named Time of flight. The principle of TOF ranging is to obtain the target object distance by detecting the time of flight (round trip) of a light pulse by continuously sending a light pulse to the target and then receiving the light returning from the object with a sensor. Different from the traditional laser ranging, TOF safety is high, cost is low, measurement is accurate and fast, and finally depth information of the whole image can be obtained, and an APD-TOF depth sensor (APD-avalanche photodiode) developed at present in the release already achieves a 3D remote imaging effect that the ranging precision is 10 cm in a range of 10-100 m, and meets the error standard of electric power infrared temperature measurement. The TOF depth range results are visualized as shown in fig. 3, which is a three-dimensional matrix with distance parameters.
A second part: and (3) infrared temperature detection: the working principle is that the optical system receives the infrared radiation of the detected target, the infrared radiation energy distribution pattern is reflected on each photosensitive element of the infrared detector array on the focal plane through spectral filtering, the detector converts the infrared radiation into electric signals, and the electric signals are sent to a microcomputer for video image processing through a complex signal conditioning circuit; and substituting the depth ranging parameters into a radiation conversion formula, converting the radiation value into temperature parameters, and finally identifying the temperature on a display screen by colors through pseudo color coding to obtain the infrared temperature chromatogram. A common temperature conversion method of a thermal infrared imager is shown as a formula (1):
in the formula (I), the compound is shown in the specification,T ob represents the observed temperature; parameter(s)dRepresenting the distance from the measured object to the lens;T atm represents the atmospheric temperature;T o represents the ambient temperature;ωrepresents the ambient relative humidity;ε ob emissivity for representing ambient wave band。
The whole temperature imaging effect of the novel infrared thermal imager is shown in fig. 4, and the whole process relates to three graphs: the system comprises visible light, a distance depth map and an infrared map, wherein distance parameters provided by the distance depth map correct infrared temperature conversion results, the whole process is synchronously carried out in real time, and the temperature measurement efficiency and accuracy are guaranteed.
In summary, the thermal infrared imager with the TOF sensor provides full-pixel distance parameters through depth ranging, and provides distance information of each pixel point for a temperature conversion stage; the distance parameter is not needed to be manually calibrated, so that the temperature measurement efficiency is ensured; the method involves that the distance calibration is a full pixel point, not a whole object, so the temperature measurement accuracy is higher.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a thermal infrared imager with TOF sensor, includes TOF degree of depth camera (1), infrared lens (2), infrared imager fuselage (3) and infrared imager demonstration and control screen (4), its characterized in that: the one end of infrared imaging appearance fuselage (3) is provided with infrared camera lens (2) that are used for infrared temperature to detect, the top of infrared camera lens (2) is provided with TOF degree of depth camera (1) that is used for TOF degree of depth range finding, one side activity of infrared imaging appearance fuselage (3) is provided with infrared imaging appearance demonstration and controls screen (4), TOF degree of depth camera (1), infrared camera lens (2) and infrared imaging appearance demonstration and control screen (4) and all carry out electric connection with the inside controller of infrared imaging appearance fuselage (3).
2. The thermal infrared imager with TOF sensor of claim 1, wherein: one side of infrared imager fuselage (3) has infrared imager to show and control screen (4) through loose axle activity two, the contained angle scope between infrared imager fuselage (3) and the infrared imager demonstration and control screen (4) is zero degree to ninety degrees.
3. The thermal infrared imager with TOF sensor of claim 1, wherein: the TOF depth camera (1) is internally provided with a TOF depth sensor, and a distance depth map of a measurement target is obtained by using the TOF depth sensor, so that all pixel points in a shooting range have respective corresponding distance attributes.
4. The thermal infrared imager with TOF sensor of claim 3, wherein: the infrared lens (2) and the distance detection part have completely consistent view fields, the infrared imaging part substitutes the distance attribute of each pixel point, and the temperature value of each pixel is obtained by adopting a calculation formula of radiation conversion temperature.
5. The thermal infrared imager with TOF sensor of claim 4, wherein: the common method for temperature conversion of the external thermal imager is as follows:
in the formula (I), the compound is shown in the specification,T ob represents the observed temperature; parameter(s)dRepresenting the distance from the measured object to the lens;T atm represents the atmospheric temperature;T o represents the ambient temperature;ωrepresents the ambient relative humidity;ε ob representing the ambient band emissivity.
6. The thermal infrared imager with TOF sensor of claim 5, wherein: TOF depth ranging is carried out by using a TOF depth sensor to obtain a distance depth map, the distance depth map is used for providing data reference for the infrared lens (2), depth ranging parameters are substituted into a radiation conversion formula, radiation values are converted into temperature parameters, and finally temperature is identified on a display screen through pseudo color coding to obtain an infrared temperature chromatogram map.
7. The thermal infrared imager with TOF sensor of claim 1, wherein: the whole temperature imaging process involves three graphs: the system comprises visible light, a distance depth map and an infrared map, wherein distance parameters provided by the distance depth map correct infrared temperature conversion results, and the whole process is synchronously carried out in real time.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115406934A (en) * | 2022-08-26 | 2022-11-29 | 山东大学 | Tunnel water leakage detection method, system and device with adjustable infrared thermal imager parameters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115406934A (en) * | 2022-08-26 | 2022-11-29 | 山东大学 | Tunnel water leakage detection method, system and device with adjustable infrared thermal imager parameters |
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