CN114993999A - System and method for measuring average transmittance of infrared lens spectrum - Google Patents
System and method for measuring average transmittance of infrared lens spectrum Download PDFInfo
- Publication number
- CN114993999A CN114993999A CN202210757158.8A CN202210757158A CN114993999A CN 114993999 A CN114993999 A CN 114993999A CN 202210757158 A CN202210757158 A CN 202210757158A CN 114993999 A CN114993999 A CN 114993999A
- Authority
- CN
- China
- Prior art keywords
- infrared
- black body
- temperature
- temperature difference
- infrared imaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002834 transmittance Methods 0.000 title claims abstract description 64
- 238000001228 spectrum Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000003331 infrared imaging Methods 0.000 claims abstract description 131
- 230000004044 response Effects 0.000 claims abstract description 65
- 230000005855 radiation Effects 0.000 claims abstract description 55
- 238000005259 measurement Methods 0.000 claims abstract description 23
- 238000003384 imaging method Methods 0.000 claims abstract description 16
- 230000003595 spectral effect Effects 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000012935 Averaging Methods 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 8
- 238000000691 measurement method Methods 0.000 claims 1
- 238000011156 evaluation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004590 computer program Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/59—Transmissivity
Abstract
The invention relates to the technical field of infrared measurement, in particular to a system and a method for measuring the average transmittance of an infrared lens spectrum, wherein the system comprises a temperature difference black body, an infrared imaging system and a digital image acquisition computer; the temperature differential blackbody is used for providing infrared radiation; the infrared imaging system is used for acquiring the infrared radiation of the temperature difference black body, converting the infrared radiation into a digital image signal and outputting the digital image signal to the digital image acquisition computer; the infrared imaging system comprises an infrared imaging component and an infrared lens to be detected; the digital image acquisition computer is used for acquiring digital image signals and calculating the spectral average transmittance of the infrared lens based on the gray response average value of a plurality of frames of digital images. The invention can carry out spectrum average transmittance quantitative measurement on the infrared lens for various infrared thermal radiation imaging.
Description
Technical Field
The invention relates to the technical field of infrared measurement, in particular to a system and a method for measuring the average transmittance of an infrared lens spectrum.
Background
The transmittance parameter of the infrared lens reflects the energy collection capability of the infrared lens, wherein the average spectrum transmittance of the infrared lens is one of the most important indexes for evaluating the performance of the infrared lens, and directly influences the detection performance of an infrared imaging system. However, the shape and volume of the infrared lens are different, and direct measurement is often difficult. Currently, the method for determining the average transmittance of the infrared lens spectrum is generally an indirect evaluation method: and measuring the transmittance of each lens forming the infrared lens, and comprehensively evaluating the spectrum average transmittance of the infrared lens by combining the energy absorption condition of each lens material. The method is difficult to accurately reflect the characteristics of the complete infrared lens, and the prior art lacks a technical means for testing the average transmittance of the spectrum of the whole infrared lens.
Therefore, in view of the above disadvantages, it is desirable to provide a measurement system and method capable of measuring the average transmittance of the spectrum of the complete infrared lens.
Disclosure of Invention
Technical problem to be solved
The invention aims to solve the technical problem that the spectral average transmittance of a complete infrared lens is difficult to directly measure.
(II) technical scheme
In order to solve the above technical problem, the present invention provides a system for measuring an average transmittance of an infrared lens spectrum, comprising:
the temperature difference black body, the infrared imaging system and the digital image acquisition computer;
the temperature differential black body is used for providing infrared radiation;
the infrared imaging system is used for acquiring the infrared radiation of the temperature difference black body, converting the infrared radiation into a digital image signal and outputting the digital image signal to the digital image acquisition computer; the infrared imaging system comprises an infrared imaging component and an infrared lens to be detected;
the digital image acquisition computer is used for acquiring digital image signals and calculating the spectral average transmittance of the infrared lens based on the gray response average value of a plurality of frames of digital images;
the expression formula for calculating the spectral average transmittance of the infrared lens is as follows:
g (0) represents the gray response average value of a multi-frame digital image obtained by the infrared imaging component and the temperature difference black body without an infrared lens, wherein the difference temperature of the temperature difference black body is 0 ℃, g (delta T) represents the gray scale response average value of multi-frame digital images obtained by that the differential temperature of the temperature differential black body is delta T ℃ and no infrared lens is arranged between the infrared imaging component and the temperature differential black body, G' (0) represents the gray scale response average value of multi-frame digital images obtained by that the differential temperature of the temperature differential black body is 0 ℃ and an infrared lens is arranged between the infrared imaging component and the temperature differential black body, g' (delta T) represents the gray response average value of a multi-frame digital image obtained by arranging an infrared lens between the infrared imaging component and the temperature differential black body, wherein the differential temperature of the temperature differential black body is delta T DEG C; and the delta T is more than or equal to 1 and does not exceed the linear response interval of the infrared imaging system.
Optionally, the system for measuring average transmittance of infrared lens spectrum further includes:
the constant temperature box is used for preserving heat; the temperature difference black body and the infrared imaging system are arranged inside the constant temperature box.
Optionally, when the infrared imaging system collects the infrared radiation of the temperature differential black body, the effective radiation surface of the temperature differential black body is full of the imaging view field of the infrared imaging system.
Optionally, when the infrared imaging system collects the infrared radiation of the temperature difference black body, the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared imaging system is 10 mm-20 mm.
The invention also provides a method for measuring the average transmittance of the infrared lens spectrum, which is realized by adopting the system for measuring the average transmittance of the infrared lens spectrum, and comprises the following steps:
enabling no infrared lens to be arranged between the infrared imaging assembly and the temperature difference black body, respectively obtaining corresponding K frame digital images when the difference temperature of the temperature difference black body is 0 ℃ and delta T ℃, and respectively carrying out averaging calculation to obtain corresponding gray response average values G (0) and G (delta T); k is a positive integer greater than 1;
arranging an infrared lens to be detected between the infrared imaging component and the temperature difference black body, respectively acquiring corresponding K frame digital images when the difference temperature of the temperature difference black body is 0 ℃ and delta T ℃, and respectively carrying out averaging calculation to obtain corresponding gray scale response average values G '(0) and G' (delta T);
based on the obtained gray-scale response average values G (0), G (Δ T), G '(0), and G' (Δ T), the spectral average transmittance of the infrared lens is calculated.
Optionally, when the system for measuring an average transmittance of an infrared lens spectrum further includes a thermostat, the making of no infrared lens between the infrared imaging assembly and the temperature differential black body respectively obtains K frames of digital images corresponding to differential temperatures of the temperature differential black body being 0 ℃ and Δ T ℃, and respectively performs averaging calculation to obtain corresponding gray scale response average values G (0) and G (Δ T), including:
placing the temperature difference black body and the infrared imaging system without an infrared lens in the incubator, and stabilizing the infrared imaging assembly and the temperature difference black body at a first temperature;
setting the differential temperature of the temperature differential black body to be 0 ℃, acquiring a K frame digital image by using the digital image acquisition computer, and calculating a gray response average value G (0);
setting the differential temperature of the temperature differential black body to be delta T ℃, and acquiring a K frame digital image by using the digital image acquisition computer and calculating a gray response average value G (delta T).
Optionally, the setting of the infrared lens to be measured between the infrared imaging component and the temperature difference black body, separately obtaining corresponding K-frame digital images when the difference temperature of the temperature difference black body is 0 ℃ and Δ T ℃, and separately performing averaging calculation to obtain corresponding gray response average values G '(0) and G' (Δ T), includes:
assembling an infrared lens to be detected in the infrared imaging system and arranging the infrared lens to be detected at the front end of the infrared imaging component;
placing the temperature differential black body and the infrared imaging system provided with the infrared lens in the incubator, and stabilizing the infrared lens, the infrared imaging assembly and the temperature differential black body at a second temperature; the second temperature is equal to the first temperature;
setting the differential temperature of the temperature differential black body to be 0 ℃, acquiring a K frame digital image by using the digital image acquisition computer, and calculating a gray response average value G' (0);
setting the differential temperature of the temperature differential black body to be delta T ℃, and acquiring K frames of digital images by using the digital image acquisition computer and calculating a gray response average value G' (delta T).
Optionally, the placing the temperature differential black body and the infrared imaging system without an infrared lens in the incubator includes:
the infrared imaging assembly is close to the temperature difference black body, the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared imaging assembly is 10-20 mm, and the effective radiation surface of the temperature difference black body is full of the imaging view field of the infrared imaging assembly.
Optionally, the placing the temperature differential black body and the infrared imaging system equipped with an infrared lens in the incubator includes:
and enabling the infrared lens to be close to the temperature difference black body, wherein the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared lens is 10-20 mm, and the effective radiation surface of the temperature difference black body is full of the imaging view field of the infrared lens.
(III) advantageous effects
The technical scheme of the invention has the following advantages: the invention provides a system and a method for measuring the average transmittance of an infrared lens spectrum, which are used for calculating the average transmittance of the infrared lens spectrum based on the gray response average value of a multi-frame digital image obtained by arranging or not arranging the infrared lens between an infrared imaging component and a temperature differential black body, can directly measure the infrared lens with various sizes and shapes, have good universality and are easy to realize, solve the problem that the average transmittance of the infrared lens spectrum is difficult to directly measure completely, and fill the blank in the prior art.
Drawings
Fig. 1 is a schematic structural diagram of an infrared lens spectrum average transmittance measurement system in an embodiment of the present invention, in a case where an infrared lens is not provided;
FIG. 2 is a schematic structural diagram of a system for measuring an average transmittance of a spectrum of an infrared lens according to an embodiment of the present invention when the infrared lens is disposed;
FIG. 3 is a schematic diagram illustrating steps of a method for measuring an average transmittance of an infrared lens spectrum according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating steps of another method for measuring an average transmittance of an infrared lens spectrum according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As mentioned above, the average transmittance of the infrared lens spectrum is one of the most important indicators for evaluating the performance of the infrared lens, and directly affects the detection performance of the infrared imaging system. However, the shape and volume of the infrared lens are different, and direct measurement is often difficult. Currently, the method for determining the average transmittance of the infrared lens spectrum is generally an indirect evaluation method: and measuring the transmittance of each lens forming the infrared lens, and comprehensively evaluating the spectrum average transmittance of the infrared lens by combining the energy absorption condition of each lens material. The indirect evaluation method is difficult to accurately reflect the characteristics of the complete infrared lens, for example, the indirect evaluation method cannot include factors of transmission energy reduction of the lens due to improper assembly, so that the indirect evaluation method often has a good result, but the energy transmittance in actual use cannot reach the evaluation value. The prior art lacks a technical means for testing the average transmittance of the spectrum of the whole infrared lens. In view of the above, the present invention provides a system and a method for measuring an average transmittance of a spectrum for a complete infrared lens.
Specific implementations of the above concepts are described below.
As shown in fig. 1 and fig. 2, an infrared lens spectrum average transmittance measurement system according to an embodiment of the present invention includes: the temperature difference black body, the infrared imaging system and the digital image acquisition computer; wherein the temperature differential blackbody is configured to provide infrared radiation; the infrared imaging system is used for acquiring the infrared radiation of the temperature difference black body, converting the infrared radiation into a digital image signal and outputting the digital image signal to the digital image acquisition computer; the infrared imaging system comprises an infrared imaging component and an infrared lens to be detected; the digital image acquisition computer is used for acquiring digital image signals to obtain digital images, and calculating the spectral average transmittance of the infrared lens based on the gray response average value of a plurality of frames of digital images;
the expression formula for calculating the spectral average transmittance of the infrared lens is as follows:
g (0) represents the gray response average value of a multi-frame digital image obtained by the infrared imaging component and the temperature difference black body without an infrared lens, wherein the difference temperature of the temperature difference black body is 0 ℃, g (delta T) represents the gray scale response average value of multi-frame digital images obtained by that the differential temperature of the temperature differential black body is delta T ℃ and no infrared lens is arranged between the infrared imaging component and the temperature differential black body, G' (0) represents the gray scale response average value of multi-frame digital images obtained by that the differential temperature of the temperature differential black body is 0 ℃ and an infrared lens is arranged between the infrared imaging component and the temperature differential black body, g' (delta T) represents the gray response average value of a multi-frame digital image obtained by arranging an infrared lens between the infrared imaging component and the temperature differential black body, wherein the differential temperature of the temperature differential black body is delta T DEG C; and the delta T is more than or equal to 1 and does not exceed the linear response interval of the infrared imaging system.
It should be noted that, an infrared imaging component, also called an infrared detection component, is used in the prior art (for example, applied in a thermal imager), and functions to converge external radiation onto a target surface of a detector, and output a digital image signal through a photoelectric signal conversion circuit, so as to be collected and calculated by a digital image collecting computer at a rear end. The digital image acquisition computer acquires digital image signals, and the obtained digital image is an original image acquired by the infrared imaging system, namely an original image without a correction coefficient, so that the influence of the correction coefficient on the measurement result of the infrared imaging system is avoided. If the number of blind pixels of the detector in the infrared imaging system is large due to process problems, the blind pixels are preferably filled by using adjacent effective pixels before calculating the gray response average value of a multi-frame digital image, so that the blind pixels are prevented from interfering with the measurement result.
The embodiment of the invention obtains the spectrum average transmittance of the infrared lens in the detection waveband by comparing the response of the infrared imaging system with the infrared lens and the infrared imaging system without the infrared lens at different differential temperatures, can be used for evaluating the performance of the complete infrared lens, is suitable for infrared thermal radiation imaging infrared lenses with various sizes and shapes, is easy to realize, has good universality, solves the problem that the spectrum average transmittance of the complete infrared lens is difficult to directly measure, and fills the blank in the prior art.
Optionally, as shown in fig. 1 and fig. 2, the infrared lens spectrum average transmittance measurement system further includes an incubator for maintaining the temperature; the temperature difference blackbody and the infrared imaging system are arranged inside the constant temperature box.
Through will temperature difference blackbody with infrared imaging system sets up inside the thermostated container, utilize the thermostated container to keep warm, can reduce the interference that external environment changes and cause among the measurement process, ensure that the digital image of surveying can truly reflect infrared radiation that infrared imaging system received.
Optionally, when the infrared imaging system collects the infrared radiation of the temperature difference black body, the effective radiation surface of the temperature difference black body is full of the imaging view field of the infrared imaging system.
In the above embodiment, the effective radiation surface of the temperature differential black body should be large enough to fill the imaging field of view of the infrared imaging system, whether the imaging field of view of the infrared lens or the imaging field of view of the infrared imaging assembly, otherwise it is difficult for the detector to obtain the infrared radiation of the black body with the full field of view, which may cause a large measurement error.
Optionally, when the infrared imaging system collects the infrared radiation of the temperature difference black body, the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared imaging system is 10 mm-20 mm.
Because infrared imaging component itself does not have stronger ability of converging light, in order to ensure that the detector obtains the black body infrared radiation of full field of view, avoids external background radiation to disturb measuring result, infrared imaging system's incident end, no matter be infrared lens's incident end (also be infrared lens's head piece window), still infrared imaging component's incident end (also be infrared imaging component's incident window), should press close to as far as possible the temperature difference black body, but the distance is undersized, infrared lens or infrared imaging component probably collide with the temperature difference black body takes place, therefore infrared imaging system's incident end with the effective radiation face's of temperature difference black body interval can set up to 10mm ~ 20mm, under the circumstances of guaranteeing safety, reduces the incident end that background radiation got into infrared imaging system as far as possible.
As shown in fig. 3, the present invention further provides a method for measuring an average transmittance of an infrared lens spectrum, which is implemented by using the system for measuring an average transmittance of an infrared lens spectrum according to any one of the embodiments described above, and the method includes the following steps:
in step 304, the spectral average transmittance of the infrared lens is calculated based on the obtained gray-scale response average values G (0), G (Δ T), G '(0), and G' (Δ T).
In the above embodiment, for the case that the infrared lens to be measured is not set in the infrared imaging system, the differential temperature is set to 0 ℃, and then G (0) ═ a is set 1 L 1 (0)+a 2 L 0 + b wherein a 1 、a 2 And b is a linear fitting coefficient, L 0 Representing the brightness of the ambient radiation, determined by the background radiation, L 1 (0) The target radiation brightness of the black body with the differential temperature of 0 ℃ is determined by the infrared radiation provided by the temperature differential black body; continuing to set the differential temperature to Δ T ℃, G (Δ T) ═ 0 ═ a 1 L 1 (ΔT)+a 2 L 0 +b，L 1 (delta T) represents the radiation brightness of the black body target with the differential temperature delta T ℃, and the difference of the average gray response values of the infrared imaging system without a lens under the two differential temperatures is G (delta T) -G (0) ═ a 1 (L 1 (ΔT)-L 1 (0) ); for the case of adding an infrared lens, the differential temperature is set to 0 ℃, and G' (0) ═ τ a is provided 1 L 1 (0)+a 2 L 0 + b, continuing to set the differential temperature to Δ T deg.c, then G' (Δ T) ═ τ a 1 L 1 (ΔT)+a 2 L 0 + b, it is possible to obtain an infrared imaging system incorporating an infrared lens with a difference G '(Δ T) -G' (0) ═ a between the mean values of the gray response at two differential temperatures 1 τ(L 1 (ΔT)-L 1 (0) And then the calculation formula of the average transmittance tau of the infrared lens spectrum is as follows:
it should be noted that the differential temperature Δ T should be kept the same for the infrared imaging system without the infrared lens and the infrared imaging system with the lens against the temperature differential black body. The delta T is more than or equal to 1 ℃, so that the influence of the detection precision limit of an infrared imaging system on the measurement result can be reduced.
Optionally, when the infrared lens spectrum average transmittance measurement system further comprises an oven, step 300 comprises:
placing the temperature difference black body and the infrared imaging system without an infrared lens in the incubator, and stabilizing the infrared imaging assembly and the temperature difference black body at a first temperature; the infrared imaging system without the infrared lens can adopt an infrared imaging system with the infrared lens to be detected detached;
adjusting the temperature difference black body in a temperature difference mode, setting the difference temperature to be 0 ℃, acquiring a K frame digital image by using the digital image acquisition computer, and calculating a gray response average value G (0);
setting the differential temperature of the temperature differential black body to be delta T ℃, collecting K frames of digital images by using the digital image collecting computer, and calculating a gray response average value G (delta T).
In the embodiment, the infrared imaging system and the temperature difference black body are placed in the thermostat, so that the interference of the external environment to the measurement process can be reduced.
Alternatively, the expression for calculating the gray response average value G (0) is:
in the formula, G (i, j, 0) represents the gray response of the pixel with the differential temperature of 0 ℃ and the position of (i, j), M, N represents the side length of the digital image respectively, and M multiplied by N is the total number of pixels;
the expression for calculating the gray response average value G (Δ T) is:
in the formula, G (i, j, Δ T) represents the gray-scale response of the pixel at the position (i, j) when the differential temperature is Δ T ℃.
In the above embodiment, the gray response average value is calculated based on the acquired K frames of digital images, and the gray response average value of a single frame of image is calculated first, and then the gray response average value corresponding to a plurality of frames of images is calculated. The gray response average value is calculated by collecting multi-frame digital images, so that the noise fluctuation of the detector can be eliminated, and more real and effective data can be obtained. The digital images of K frames are preferably acquired continuously.
Further, step 302 includes:
assembling an infrared lens to be detected in the infrared imaging system and arranging the infrared lens to be detected at the front end of the infrared imaging component; the front end is close to one side of the temperature difference black body;
placing the temperature differential black body and the infrared imaging system provided with the infrared lens in the incubator, and stabilizing the infrared lens, the infrared imaging assembly and the temperature differential black body at a second temperature; the second temperature is equal to the first temperature;
setting the differential temperature of the temperature differential black body to be 0 ℃, acquiring a K frame digital image by using the digital image acquisition computer, and calculating a gray response average value G' (0);
setting the differential temperature of the temperature differential black body to be delta T ℃, and acquiring a K frame digital image by using the digital image acquisition computer and calculating a gray response average value G' (delta T).
In the above embodiment, the measured ambient temperatures (i.e. the first temperature and the second temperature) of the infrared imaging system without the infrared lens and the infrared imaging system with the infrared lens in the incubator are kept consistent, so as to avoid interference caused by ambient temperature changes.
It should be noted that, in the whole measurement process, the integration time of the acquired digital images of each frame should be the same, and the energy accumulation should not exceed the response range of the detector, otherwise, the obtained digital images are difficult to reflect the real situation of infrared radiation, and the accurate infrared lens spectrum average transmittance cannot be calculated naturally.
Further, the placing the temperature differential black body and the infrared imaging system without an infrared lens in the incubator comprises:
the infrared imaging assembly is close to the temperature difference black body, the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared imaging assembly is 10-20 mm, and the effective radiation surface of the temperature difference black body is full of the imaging view field of the infrared imaging assembly.
Further, the placing the temperature differential black body and the infrared imaging system equipped with an infrared lens in the incubator includes:
and enabling the infrared lens to be close to the temperature difference black body, wherein the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared lens is 10-20 mm, and the effective radiation surface of the temperature difference black body is full of the imaging view field of the infrared lens.
Preferably, for an infrared imaging system comprising the infrared lens, the infrared lens can be positioned at a focal plane position where the actual imaging is clear.
In the above embodiment, the infrared imaging system is close to the temperature differential black body, and the effective radiation surface of the temperature differential black body is made to fill the imaging field of view of the infrared imaging system, so that the incidence of background radiation can be reduced as much as possible, the measurement accuracy of the target radiation brightness of the black body is improved, and the measurement accuracy of the final average transmittance of the infrared lens spectrum is improved.
As shown in fig. 4, the present invention further provides a method for measuring an average transmittance of an infrared lens spectrum, which includes the following steps:
in step 412, the spectral average transmittance of the infrared lens is calculated based on the obtained grayscale response average values G (0), G (Δ T), G '(0), and G' (Δ T).
In particular, in some preferred embodiments of the present invention, there is also provided a computer device, including a memory and a processor, the memory storing a computer program, and the processor implementing the steps of the method in any of the above embodiments when executing the computer program.
In other preferred embodiments of the present invention, a computer-readable storage medium is also provided, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any of the above-mentioned embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the embodiments of the methods described above can be included, and will not be repeated here.
In summary, the present invention discloses a system and a method for measuring an average transmittance of an infrared lens spectrum, which can be used for measuring an average transmittance of an infrared lens spectrum. The infrared imaging system and the temperature difference black body are placed in a thermostat, responses of the infrared imaging system with the infrared lens and the infrared imaging system without the infrared lens at different difference temperatures are compared, and the spectral average transmittance of the infrared lens in a response wave band of the detector is calculated. The invention is easy to realize and can be suitable for different infrared lenses.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An infrared lens spectrum average transmittance measurement system, comprising:
the temperature difference black body, the infrared imaging system and the digital image acquisition computer;
the temperature differential blackbody is used for providing infrared radiation;
the infrared imaging system is used for acquiring the infrared radiation of the temperature difference black body, converting the infrared radiation into a digital image signal and outputting the digital image signal to the digital image acquisition computer; the infrared imaging system comprises an infrared imaging component and an infrared lens to be detected;
the digital image acquisition computer is used for acquiring digital image signals and calculating the spectral average transmittance of the infrared lens based on the gray response average value of a plurality of frames of digital images;
the expression formula for calculating the spectral average transmittance of the infrared lens is as follows:
g (0) represents the gray response average value of a multi-frame digital image obtained by the infrared imaging component and the temperature difference black body without an infrared lens, wherein the difference temperature of the temperature difference black body is 0 ℃, g (delta T) represents the gray scale response average value of multi-frame digital images obtained by that the differential temperature of the temperature differential black body is delta T ℃ and no infrared lens is arranged between the infrared imaging component and the temperature differential black body, G' (0) represents the gray scale response average value of multi-frame digital images obtained by that the differential temperature of the temperature differential black body is 0 ℃ and an infrared lens is arranged between the infrared imaging component and the temperature differential black body, g' (delta T) represents the gray response average value of a multi-frame digital image obtained by arranging an infrared lens between the infrared imaging component and the temperature differential black body, wherein the differential temperature of the temperature differential black body is delta T DEG C; and the delta T is more than or equal to 1 and does not exceed the linear response interval of the infrared imaging system.
2. The system for measuring average transmittance through an infrared lens spectrum according to claim 1, characterized by further comprising:
the constant temperature box is used for preserving heat; the temperature difference blackbody and the infrared imaging system are arranged inside the constant temperature box.
3. The system for measuring average transmittance through an infrared lens spectrum according to claim 1, characterized in that:
when the infrared imaging system collects the infrared radiation of the temperature difference black body, the effective radiation surface of the temperature difference black body is full of the imaging view field of the infrared imaging system.
4. The infrared lens spectrum average transmittance measurement system according to claim 1, characterized in that:
when the infrared imaging system collects the infrared radiation of the temperature difference black body, the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared imaging system is 10-20 mm.
5. An infrared lens spectrum average transmittance measurement method, which is implemented by using the infrared lens spectrum average transmittance measurement system according to any one of claims 1 to 4, and comprises the following steps:
enabling no infrared lens to be arranged between the infrared imaging assembly and the temperature difference black body, respectively obtaining corresponding K frame digital images when the difference temperature of the temperature difference black body is 0 ℃ and delta T ℃, and respectively carrying out averaging calculation to obtain corresponding gray response average values G (0) and G (delta T); k is a positive integer greater than 1;
arranging an infrared lens to be detected between the infrared imaging component and the temperature difference black body, respectively acquiring corresponding K frame digital images when the difference temperature of the temperature difference black body is 0 ℃ and delta T ℃, and respectively carrying out averaging calculation to obtain corresponding gray scale response average values G '(0) and G' (delta T);
the spectral average transmittance of the infrared lens is calculated based on the obtained grayscale response average values G (0), G (Δ T), G '(0), and G' (Δ T).
6. The method of claim 5, wherein:
when the infrared lens spectrum average transmittance measurement system further comprises a thermostat, the step of enabling no infrared lens to be arranged between the infrared imaging assembly and the temperature difference black body, respectively obtaining corresponding K frame digital images when the difference temperature of the temperature difference black body is 0 ℃ and delta T ℃, and respectively carrying out averaging calculation to obtain corresponding gray scale response average values G (0) and G (delta T), comprises the steps of:
placing the temperature difference black body and the infrared imaging system without an infrared lens in the incubator, and stabilizing the infrared imaging assembly and the temperature difference black body at a first temperature;
setting the differential temperature of the temperature differential black body to be 0 ℃, acquiring a K-frame digital image by using the digital image acquisition computer, and calculating a gray response average value G (0);
setting the differential temperature of the temperature differential black body to be delta T ℃, collecting K frames of digital images by using the digital image collecting computer, and calculating a gray response average value G (delta T).
7. The method of claim 6, wherein:
the method comprises the following steps of arranging an infrared lens to be detected between the infrared imaging component and the temperature difference black body, respectively obtaining corresponding K frame digital images when the difference temperature of the temperature difference black body is 0 ℃ and delta T ℃, respectively carrying out averaging calculation to obtain corresponding gray scale response average values G '(0) and G' (delta T), and comprises the following steps:
assembling an infrared lens to be detected in the infrared imaging system and arranging the infrared lens to be detected at the front end of the infrared imaging component;
placing the temperature difference black body and the infrared imaging system assembled with the infrared lens in the incubator, and stabilizing the infrared lens, the infrared imaging assembly and the temperature difference black body at a second temperature; the second temperature is equal to the first temperature;
setting the differential temperature of the temperature differential black body to be 0 ℃, acquiring a K frame digital image by using the digital image acquisition computer, and calculating a gray response average value G' (0);
setting the differential temperature of the temperature differential black body to be delta T ℃, and acquiring K frames of digital images by using the digital image acquisition computer and calculating a gray response average value G' (delta T).
8. The method of claim 6, wherein:
the will the temperature difference blackbody with do not add infrared camera lens infrared imaging system arranges in the thermostated container, include:
the infrared imaging assembly is close to the temperature difference black body, the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared imaging assembly is 10-20 mm, and the effective radiation surface of the temperature difference black body is full of the imaging view field of the infrared imaging assembly.
9. The method of claim 7, wherein:
arranging the temperature difference black body and the infrared imaging system provided with the infrared lens in the incubator, comprising:
and enabling the infrared lens to be close to the temperature difference black body, wherein the distance between the effective radiation surface of the temperature difference black body and the incident end of the infrared lens is 10-20 mm, and the effective radiation surface of the temperature difference black body is full of the imaging view field of the infrared lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210757158.8A CN114993999A (en) | 2022-06-30 | 2022-06-30 | System and method for measuring average transmittance of infrared lens spectrum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210757158.8A CN114993999A (en) | 2022-06-30 | 2022-06-30 | System and method for measuring average transmittance of infrared lens spectrum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114993999A true CN114993999A (en) | 2022-09-02 |
Family
ID=83019410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210757158.8A Pending CN114993999A (en) | 2022-06-30 | 2022-06-30 | System and method for measuring average transmittance of infrared lens spectrum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114993999A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160234489A1 (en) * | 2014-06-23 | 2016-08-11 | Unlimited Optics Corp. | Method for measuring performance parameters and detecting bad pixels of an infrared focal plane array module |
| CN106053026A (en) * | 2016-07-06 | 2016-10-26 | 中国科学院西安光学精密机械研究所 | Optical efficiency testing device and optical efficiency testing method for infrared fiber image-transmitting bundle |
| CN107941348A (en) * | 2017-11-24 | 2018-04-20 | 广东电网有限责任公司电力科学研究院 | A kind of infrared measurement of temperature Calibration Method |
| CN109060731A (en) * | 2018-06-25 | 2018-12-21 | 中国科学院西安光学精密机械研究所 | Infrared optical system spectral transmittance test device and method |
| CN109342025A (en) * | 2018-09-27 | 2019-02-15 | 西北工业大学 | One kind dividing focal plane infrared polarization image camera polarizer transmission test method |
| CN109870240A (en) * | 2019-03-13 | 2019-06-11 | 北京环境特性研究所 | Infrared Targets image real-time quantitative processing system with environment self-adaption |
| CN112050948A (en) * | 2020-08-05 | 2020-12-08 | 沈阳上博智像科技有限公司 | Non-barrier infrared temperature measurement method based on detector temperature drift model |
| CN212110340U (en) * | 2020-06-08 | 2020-12-08 | 无锡物联网创新中心有限公司 | Multichannel infrared sensor test system |
| WO2022110283A1 (en) * | 2020-11-24 | 2022-06-02 | 烟台艾睿光电科技有限公司 | Infrared temperature measurement method, apparatus, device, and storage medium |
-
2022
- 2022-06-30 CN CN202210757158.8A patent/CN114993999A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160234489A1 (en) * | 2014-06-23 | 2016-08-11 | Unlimited Optics Corp. | Method for measuring performance parameters and detecting bad pixels of an infrared focal plane array module |
| CN106053026A (en) * | 2016-07-06 | 2016-10-26 | 中国科学院西安光学精密机械研究所 | Optical efficiency testing device and optical efficiency testing method for infrared fiber image-transmitting bundle |
| CN107941348A (en) * | 2017-11-24 | 2018-04-20 | 广东电网有限责任公司电力科学研究院 | A kind of infrared measurement of temperature Calibration Method |
| CN109060731A (en) * | 2018-06-25 | 2018-12-21 | 中国科学院西安光学精密机械研究所 | Infrared optical system spectral transmittance test device and method |
| CN109342025A (en) * | 2018-09-27 | 2019-02-15 | 西北工业大学 | One kind dividing focal plane infrared polarization image camera polarizer transmission test method |
| CN109870240A (en) * | 2019-03-13 | 2019-06-11 | 北京环境特性研究所 | Infrared Targets image real-time quantitative processing system with environment self-adaption |
| CN212110340U (en) * | 2020-06-08 | 2020-12-08 | 无锡物联网创新中心有限公司 | Multichannel infrared sensor test system |
| CN112050948A (en) * | 2020-08-05 | 2020-12-08 | 沈阳上博智像科技有限公司 | Non-barrier infrared temperature measurement method based on detector temperature drift model |
| WO2022110283A1 (en) * | 2020-11-24 | 2022-06-02 | 烟台艾睿光电科技有限公司 | Infrared temperature measurement method, apparatus, device, and storage medium |
Non-Patent Citations (1)
| Title |
|---|
| 曹西征;郭立红;: "基于图像的飞行器红外辐射特性测量", 光学技术, no. 02, 30 March 2007 (2007-03-30) * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101167260B1 (en) | Radiometry using an uncooled microbolometer detector | |
| US20120239330A1 (en) | Radiometric calibration method for infrared detectors | |
| TWI600324B (en) | Infrared Focal Plane Array Module Performance Parameters Measurement Method and Detection of Dead pixels | |
| CN109655162A (en) | Thermal infrared imager temperature measurement correction system and method | |
| EP0837600A2 (en) | Infrared sensor device with temperature correction function | |
| US9876968B2 (en) | Drift correction method for infrared imaging device | |
| CN111751003B (en) | Thermal imager temperature correction system and method and thermal imager | |
| US20070258001A1 (en) | Method for Producing High Signal to Noise Spectral Measurements in Optical Dectector Arrays | |
| CN110487416B (en) | Rapid testing method for NETD and MRTD of thermal infrared imager | |
| US7364355B2 (en) | Method and apparatus for obtaining a temperature measurement using an InGaAs detector | |
| US8481918B2 (en) | System and method for improving the quality of thermal images | |
| CN111044153B (en) | Nonlinear calibration method and device for infrared spectrum of spectrum correlation system | |
| CN105890873A (en) | Apparatus and method for blind pixel detection of thermal infrared hyperspectral imager | |
| CN115265803A (en) | Method for measuring infrared spectrum radiation characteristics of remote point target | |
| CN111609937B (en) | Thermal infrared imager external field calibration method and device | |
| CN113096041B (en) | Image correction method and device | |
| US20220187131A1 (en) | Method and system of two-point correction based on temperature substitution | |
| Poncelet et al. | A study of IRFPA camera measurement errors: radiometric artefacts | |
| CN111207833B (en) | Temperature measurement method based on image data normalization technology | |
| CN114993999A (en) | System and method for measuring average transmittance of infrared lens spectrum | |
| CN114441043B (en) | Temperature correction method of uncooled infrared thermometer and thermometer | |
| Svensson | An evaluation of image quality metrics aiming to validate long term stability and the performance of NUC methods | |
| CN111595458B (en) | Thermal infrared imager radiometric calibration method and device | |
| CN110608800B (en) | Method, device and system for measuring solar radiation illuminance of atmospheric absorption band | |
| US10677720B2 (en) | Detector, correction method and calibration method of detector, detection apparatus and detection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |