WO2022110283A1 - Infrared temperature measurement method, apparatus, device, and storage medium - Google Patents

Abstract

Provided are an infrared temperature measurement method, apparatus, device, and storage medium: acquiring a temperature actually measured by an infrared imaging system in respect of a target; according to environment variables and a normalized spectral response function of the infrared imaging system, performing atmospheric attenuation correction on the acquired temperature to obtain first temperature data; establishing a functional relationship between an output energy at the center of the infrared imaging system and the imaging radius of the target to obtain a target proportion correction function; according to the obtained target proportion function and the imaging radius of the target, performing target imaging proportion correction on the first temperature data to obtain second temperature data. By means of the method, it is possible to resolve the complexity of a conventional single-band calibrated temperature measurement solution, while also improving the accuracy of temperature measurement of medium- and long-range targets, and to achieve timely monitoring of high-temperature targets and perform forest fire prevention, fire warning, and other preventive temperature measurement and testing functions.

Description

An infrared temperature measurement method, device, equipment and storage medium

This application claims the priority of the Chinese patent application filed on November 24, 2020 with the application number 202011328314.6 and the invention titled "An infrared temperature measurement method, device, equipment and storage medium", the entire contents of which are approved by Reference is incorporated in this application.

technical field

The invention relates to the technical field of infrared temperature measurement, in particular to an infrared temperature measurement method, device, equipment and storage medium.

Background technique

Infrared imaging temperature measurement technology has a wide range of applications in infrared detection, infrared remote sensing, military target measurement, industrial monitoring, forest fire prevention and other fields. Due to the complex principle of infrared temperature measurement, there are a large number of factors that affect the accuracy of temperature measurement (including lens parameters, environmental variables, distance coefficients, target emissivity, output drift of the infrared detector itself, etc.), especially in the field of long-distance temperature measurement. , it has been difficult to have a better temperature measurement application scheme and algorithm.

At present, for infrared imaging systems, the traditional single-band calibration temperature measurement scheme is generally used, but the temperature measurement performance within 100m can only be guaranteed; and combined with Planck's radiation law, a dual-band temperature measurement method can also be used, but it needs to be equipped with Dual-band lens, and the application field is concentrated in the high-altitude measurement above 10km, the cost is high, and it is rarely used in civilian products. In addition, the "calibration coefficient" or single-variable empirical formula is used to correct the long-distance attenuation, which has low applicability for applications under different ambient temperatures and different lenses, and the calibration is complicated. For forest fire prevention, fire warning, etc., wide field/distance There has been no better application solution for distance temperature measurement requirements.

Therefore, how to solve the problems of the complexity of the temperature measurement solution and the improvement of the accuracy of temperature measurement for medium and long distances is a technical problem to be solved urgently by those skilled in the art.

SUMMARY OF THE INVENTION

In view of the above problems, the present invention is proposed to provide an infrared temperature measurement method, device, device and storage medium that overcome the above problems or at least partially solve the above problems.

An infrared temperature measurement method, comprising:

Obtain the temperature actually tested by the infrared imaging system on the target;

Perform atmospheric attenuation correction on the acquired temperature according to the environmental variables and the normalized spectral response function of the infrared imaging system to obtain first temperature data;

establishing a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtaining a target proportion correction function;

According to the acquired target ratio function and the imaging radius of the target, the target imaging ratio correction is performed on the first temperature data to obtain second temperature data.

Preferably, in the above-mentioned infrared temperature measurement method provided by the embodiment of the present invention, the obtained temperature is subjected to atmospheric attenuation correction according to environmental variables and the normalized spectral response function of the infrared imaging system to obtain the first temperature data , including:

Obtain the spectral transmittance and scattering function of different atmospheric components to infrared radiation, and obtain the atmospheric attenuation coefficient of the infrared imaging system;

Correcting the obtained atmospheric attenuation coefficient according to the normalized spectral response function of the infrared imaging system;

Perform atmospheric attenuation correction on the acquired temperature according to the corrected atmospheric attenuation coefficient to obtain first temperature data.

Preferably, in the above-mentioned infrared temperature measurement method provided in the embodiment of the present invention, the following formula is used to correct the obtained atmospheric attenuation coefficient:

C ₁ =3.7415×10 ⁸ W·μm ⁴ /m ²

C ₂ =1.43879×10 ⁴ μm·K

where τ _re is the modified atmospheric attenuation coefficient;

is the absorption rate of CO ₂ to infrared radiation in different bands;

is the absorption rate of H ₂ O to infrared radiation in different bands; τ _Aero is the scattering function of aerosol to infrared radiation; λ is the response wavelength of the infrared imaging system; [λ ₁ ,λ ₂ ] is the infrared imaging system Response band; x is the external input target distance, CO ₂ content, relative humidity, ambient temperature, visibility; SRF _sys is the normalized spectral response function of the infrared imaging system; SRF _Dete is the normalized spectral response of the detector function; Transmittance _Lens is the normalized transmittance function of the infrared lens to infrared radiation in different bands; M _bλ is the infrared spectral radiation emittance of an ideal black body; T is the temperature value used for normalizing the radiance.

Preferably, in the above-mentioned infrared temperature measurement method provided in the embodiment of the present invention, the following formula is used to obtain the first temperature data:

Wherein, T _out1 is the first temperature data; e is the target emissivity; T _m is the acquired temperature; T _env is the ambient temperature; n is determined by Boltzmann's theorem of the response band.

Preferably, in the above-mentioned infrared temperature measurement method provided by the embodiment of the present invention, a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target is established, and the target proportion correction function is obtained, which specifically includes:

Align the optical axis of the infrared imaging system with a circular black body of the same temperature and different radii, so that the black body is imaged in the center of the screen, and obtain the output energy of the center point of the infrared imaging system;

Using the radius of the pixel occupied by the black body in the infrared imaging system as an independent variable, establish a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target;

The established functional relationship is normalized to obtain a target proportion correction function, and the obtained target proportion correction function is pre-stored in the processor of the infrared imaging system.

Preferably, in the above-mentioned infrared temperature measurement method provided by the embodiment of the present invention, before performing the target imaging ratio correction on the first temperature data according to the acquired target ratio function and the target imaging radius, the method further includes: :

Select any point in the target image, perform the difference operation along the row and column directions of the point, and obtain the approximate length and width of the connected domain of the point;

According to the obtained approximate length and width of the connected domain, the radius of the equal-area circle corresponding to the connected domain is obtained, and the radius of the equal-area circle is used as the imaging radius of the target.

Preferably, in the above-mentioned infrared temperature measurement method provided in the embodiment of the present invention, the following formula is used to obtain the second temperature data:

θ(r)=E(r)/E(r _max )=a*r^b+1

Wherein, T _out2 is the second temperature data; height and width are the obtained approximate length and width of the connected domain, respectively; r' is the radius of the equal-area circle; θ is the target ratio correction function, E(r) is the output energy of the center point of the infrared imaging system when the radius of the pixel occupied by the black body in the infrared imaging system is r; E(r _max ) is the center when the black body occupies the full screen Point output; a and b are determined by θ, E(r) and E(r _max ).

The embodiment of the present invention also provides an infrared temperature measurement device, comprising:

The test temperature acquisition module is used to acquire the temperature actually tested by the infrared imaging system on the target;

an atmospheric attenuation correction module, configured to perform atmospheric attenuation correction on the acquired temperature according to environmental variables and the normalized spectral response function of the infrared imaging system to obtain first temperature data;

A correction function acquisition module, configured to establish a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and to acquire a target proportion correction function;

The imaging ratio correction module is configured to perform target imaging ratio correction on the first temperature data according to the acquired target ratio function and the imaging radius of the target to obtain second temperature data.

An embodiment of the present invention further provides an infrared temperature measurement device, including a processor and a memory, wherein the processor implements the above infrared temperature measurement method provided by the embodiment of the present invention when the processor executes the computer program stored in the memory.

Embodiments of the present invention further provide a computer-readable storage medium for storing a computer program, wherein when the computer program is executed by a processor, the above-mentioned infrared temperature measurement method provided by the embodiments of the present invention is implemented.

It can be seen from the above technical solutions that an infrared temperature measurement method provided by the present invention includes: obtaining the temperature actually measured by the infrared imaging system on the target; The obtained temperature is corrected by atmospheric attenuation to obtain the first temperature data; the functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target is established, and the target proportion correction function is obtained; according to the obtained target proportion function and the target The imaging radius is determined, and the target imaging ratio is corrected for the first temperature data to obtain the second temperature data.

The above-mentioned infrared temperature measurement method provided by the present invention introduces a two-variable (atmospheric attenuation and target size) correction method, and corrects the attenuation with distance in combination with the actual environment. The reliability, accuracy and universality of temperature measurement, and the non-calibration scheme is used to correct the temperature drift problem of the infrared detector. On the premise of meeting the accuracy requirements, the workload is greatly reduced, and the traditional single-band calibration is solved. Due to the complexity of the temperature measurement scheme, it can also monitor the high temperature target in time, and realize preventive temperature measurement and inspection functions such as forest fire prevention and fire warning. In addition, the present invention also provides a corresponding device, device and computer-readable storage medium for the infrared temperature measurement method, which further makes the above method more practical, and the device, device and computer-readable storage medium have corresponding advantages.

The above description is only an overview of the technical solutions of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand , the following specific embodiments of the present invention are given.

Description of drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

1 shows a flowchart of an infrared temperature measurement method provided by an embodiment of the present invention;

FIG. 2 shows a schematic diagram of a point spread function provided by an embodiment of the present invention;

3 shows a flowchart of obtaining a target proportion correction function provided by an embodiment of the present invention;

FIG. 4 shows a flowchart of acquiring the imaging radius of a target provided by an embodiment of the present invention;

FIG. 5 shows a schematic structural diagram of an infrared temperature measuring device provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The present invention provides an infrared temperature measurement method, as shown in Figure 1, comprising the following steps:

S101. Obtain the temperature actually tested by the infrared imaging system on the target;

In practical applications, the temperature actually measured by the infrared imaging system on the target is realized through the basic temperature measurement algorithm;

S102, performing atmospheric attenuation correction on the acquired temperature according to the environmental variables and the normalized spectral response function of the infrared imaging system to obtain first temperature data;

It should be noted that the traditional atmospheric attenuation correction scheme usually only considers the influence of the external environment, while ignoring the influence of the spectral response function of the imaging system on it. Therefore, the present invention refers to the attenuation of long-wave infrared in the low sea level atmospheric window, And import the spectral response function of the optical system to further correct the atmospheric attenuation coefficient to make it closer to practical applications;

S103, establishing a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtaining a target proportion correction function;

It can be understood that since the optical lens has a point spread function PSF for the point light source radiation, that is, the square distribution of the radiation generated by the point light source after passing through the optical imaging system, its demonstration diagram is shown in Figure 2. Due to the linear nature of the optical imaging system, the image of a certain point can be considered as the sum of the PSFs of each point in the image. For the infrared imaging system, except that the input radiation decays with the increase of the target distance, the output radiation of the imaging system is the result of the convolution of the input radiation and the PSF:

Deconvolution operations can be performed to obtain the input radiation or a correction matrix can be constructed for precise correction, etc. Because the acquisition of the point spread function is more complicated, and the convolution kernel required for accurate correction is too large, it is not conducive to engineering applications. Therefore, the present invention adopts the method of correcting the proportion of target imaging to realize the correction of temperature, which is simple and fast;

S104. According to the obtained target ratio function and the imaging radius of the target, perform target imaging ratio correction on the first temperature data to obtain second temperature data.

In the above-mentioned infrared temperature measurement method provided by the embodiment of the present invention, a two-variable (atmospheric attenuation and target size) correction method is introduced, and the attenuation with distance is corrected in combination with the actual environment, which improves the performance of medium and long-distance targets (such as 500m～2km+) temperature measurement reliability, accuracy and universality, and the non-calibration scheme is used to correct the temperature drift problem of infrared detectors. On the premise of meeting the accuracy requirements, the workload is greatly reduced, and the The complexity of the traditional single-band calibration temperature measurement scheme, at the same time, it can monitor the high temperature target in time, and realize the preventive temperature measurement and inspection functions such as forest fire prevention and fire warning.

Further, in the specific implementation, in the above-mentioned infrared temperature measurement method provided by the embodiment of the present invention, step S102 performs atmospheric attenuation correction on the acquired temperature according to the environmental variables and the normalized spectral response function of the infrared imaging system to obtain the first temperature. A temperature data, which may specifically include the following steps:

Step 1: Obtain the spectral transmittance and scattering function of different atmospheric components to infrared radiation, and obtain the atmospheric attenuation coefficient of the infrared imaging system;

In practical applications, the absorption of CO ₂ /H ₂ O and the scattering of infrared radiation by aerosol impurities are mainly considered for long-distance long-wave infrared radiation at altitudes near the horizontal plane (less than 1 km). In the embodiment, the spectral transmittance and scattering function of different atmospheric components to infrared radiation can be obtained by using the look-up table method, and the approximate atmospheric attenuation coefficient τ(x) of the response band [λ ₁ , λ ₂ ] of the imaging system can be obtained. Combined formula:

in,

is the absorption rate of CO ₂ to infrared radiation in different bands, which can be obtained by looking up the table, and 400ppm data can be used;

is the absorption rate of H ₂ O to infrared radiation in different bands, which can be obtained by looking up the table; τ _Aero is the scattering function of aerosol to infrared radiation; λ is the response wavelength of the infrared imaging system; [λ ₁ ,λ ₂ ] is the infrared imaging The response band of the system is determined by the design of the infrared imaging system and can be obtained by testing the spectral response test system; x is the external input target distance, CO ₂ content, relative humidity, ambient temperature, and visibility;

Step 2, correcting the obtained atmospheric attenuation coefficient according to the normalized spectral response function of the infrared imaging system;

It should be noted that the normalized spectral response function corresponding to the response band [λ ₁ ,λ ₂ ] of the infrared imaging system can be confirmed by the following formula:

C ₁ =3.7415×10 ⁸ W·μm ⁴ /m ²

C ₂ =1.43879×10 ⁴ μm·K

Among them, SRF _sys is the normalized spectral response function of the infrared imaging system; SRF _Dete is the normalized spectral response function of the detector, which reflects the response of the infrared detector to different bands, which is determined by the detector design and can be Obtained by spectral test; Transmittance _Lens is the normalized transmittance function of infrared lens to infrared radiation in different bands, which is determined by lens material and optical design, and can be obtained by testing; M _bλ is the infrared spectral radiation emittance of an ideal black body; T For the temperature value used to normalize the radiance, the median value of the imaging system test range is used to approximate the temperature measurement range, for example, the target temperature measurement range is 0-150°C, T=75°C;

The resulting atmospheric attenuation coefficient can then be corrected using the following formula:

where τ _re is the modified atmospheric attenuation coefficient;

Step 3: Perform atmospheric attenuation correction on the acquired temperature according to the corrected atmospheric attenuation coefficient to obtain first temperature data;

Specifically, the infrared radiation received by the infrared imaging system mainly includes three parts: the energy emitted by the target, the energy reflected by the target, and the energy of the atmospheric environment. According to basic infrared physics, the following formula can be used to obtain the first temperature data:

Among them, T _out1 is the first temperature data; e is the target emissivity; T _m is the acquired temperature; T _env is the ambient temperature; n is determined by the Boltzmann theorem of the response band; E _aim is the energy emitted by the target; E _ref is the energy reflected by the target; E _env is the energy of the atmospheric environment.

During specific implementation, in the above-mentioned infrared temperature measurement method provided by the embodiment of the present invention, step S103 establishes the functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtains the target proportion correction function, which may be specifically Include the following steps:

First, align the optical axis of the infrared imaging system with a circular black body with the same temperature and different radii, so that the black body is imaged in the center of the screen, and obtain the output energy E of the center point of the infrared imaging system; in practical applications, the infrared imaging system and the black body It needs to be separated by a certain distance l, and this distance l is the minimum imaging distance of the infrared imaging system, even if the black body edge is clear and the shortest distance;

Then, taking the radius of the pixel occupied by the black body in the infrared imaging system as the independent variable, the functional relationship between the output energy E of the center point of the infrared imaging system and the imaging radius of the target is established; specifically, the functional relationship is E=f( r);

Finally, the established functional relationship is normalized to obtain the target proportion correction function, and the obtained target proportion correction function is pre-stored in the processor of the infrared imaging system. Specifically, the target proportion correction function corresponding to the black body is θ(r)=E(r)/E(r _max )=a*r^b+1 (recommended fitting expression); E(r) is the black body at The output energy of the center point of the infrared imaging system when the radius of the pixel occupied in the infrared imaging system is r; E(r _max ) is the output of the center point when the black body occupies the full screen; a and b are determined by θ, E(r) and E (r _max ) decides. When the imaging radius of the target is r', the target proportion correction function is θ(r')=a*r'^b+1.

Specifically, as shown in Figure 3, according to the temperature measurement results of black bodies with different radii, the radii of the pixels occupied by black bodies with different radii in the imaging system are used as independent variables ([r1, r2, r3, r4]), and the infrared imaging system Normalize the temperature measurement results of the black body center points with different radii as the dependent variable ([t1, t2, t3, t4]/t5); obtain the target proportion correction function θ(r)=a*r^b+ 1. Fit it, and finally store the fitting formula of the target ratio correction function in the imaging system processor.

In specific implementation, in the above-mentioned infrared temperature measurement method provided by the embodiment of the present invention, before performing step S104 to perform target imaging ratio correction on the first temperature data according to the obtained target ratio function and the imaging radius of the target, further It can include: first, select any point in the target imaging (such as a forest fire point, a point with a temperature exceeding 350°C can be selected), perform a difference operation along the row and column directions of the point, and obtain the approximate length and width of the connected domain of the point; then, according to The approximate length and width of the obtained connected domain are obtained, the radius of the equal-area circle corresponding to the connected domain is obtained, and the radius of the equal-area circle is taken as the imaging radius of the target.

Specifically, set the temperature imaging matrix dataT, the imaging image height is H, and the image width is W, as shown in Figure 4, select the coordinates [i0, j0] of any point in the temperature measurement target in the imaging; for the point [i0, j0 ] The difference between the horizontal and vertical directions (that is, the row and column directions) is obtained to obtain the number of pixels occupied by the temperature measurement target horizontally and vertically, that is, to obtain the approximate length and width of the connected domain containing the temperature measurement target:

The first step is to perform a differential operation on the row direction of the target point (the matlab code is as follows):

Row_dif=diff(dataT(i0,:));

Col_dif=diff(dataT(:,j0));

Among them, Row_dif is row difference data; Col_dif is column difference data;

The second step is to obtain the row/column difference data. The coordinates between the maximum and minimum values are the edges with the largest change in the row and column directions of the target point, and the coordinate difference is the approximate length and width of the connected domain of the target point:

[w1,tmp]=max(Row_dif)

[w2,tmp]=min(Row_dif)

[h1,tmp]=max(Col_dif)

[h2,tmp]=min(Col_dif)

height=abs(w1-w2)

width=abs(h1–h2)

Among them, height and width are the approximate length and width of the obtained connected domain, respectively.

Next, according to the obtained height and width of the connected domain, the radius of the equal-area circle corresponding to the connected domain is obtained

During specific implementation, in the above-mentioned infrared temperature measurement method provided by the embodiment of the present invention, the following formula is used to obtain the second temperature data:

Wherein, T _out2 is the second temperature data.

After actual testing, using the present invention, within 1 km, the temperature measurement accuracy of targets with different temperatures and sizes can reach ±10°C, which is far better than the result without this correction scheme.

Based on the same inventive concept, an embodiment of the present invention also provides an infrared temperature measurement device. Since the principle of solving the problem of the infrared temperature measurement device is similar to that of the aforementioned infrared temperature measurement method, the implementation of the infrared temperature measurement device can refer to the infrared temperature measurement device. The implementation of the temperature measurement method will not be repeated here.

During specific implementation, the infrared temperature measurement device provided by the embodiment of the present invention, as shown in FIG. 5 , specifically includes:

The test temperature acquisition module 11 is used to acquire the temperature actually tested by the infrared imaging system on the target;

The atmospheric attenuation correction module 12 is used for performing atmospheric attenuation correction on the acquired temperature according to the environmental variables and the normalized spectral response function of the infrared imaging system to obtain the first temperature data;

The correction function acquisition module 13 is used to establish a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtain the target proportion correction function;

The imaging ratio correction module 14 is configured to perform target imaging ratio correction on the first temperature data according to the acquired target ratio function and the imaging radius of the target to obtain second temperature data.

In the above-mentioned infrared temperature measurement device provided by the embodiment of the present invention, the interaction of the above-mentioned four modules can solve the complexity of the traditional single-band calibration temperature measurement scheme, and at the same time, the temperature measurement accuracy of medium and long-distance targets can be improved. Realize the timely monitoring of high temperature targets, and realize preventive temperature measurement and inspection functions such as forest fire prevention and fire warning.

For more specific working processes of the above-mentioned modules, reference may be made to the corresponding contents disclosed in the foregoing embodiments, which will not be repeated here.

Correspondingly, the embodiment of the present invention also discloses an infrared temperature measurement device, including a processor and a memory; wherein, the processor implements the infrared temperature measurement method disclosed in the foregoing embodiments when the processor executes the computer program stored in the memory.

For a more specific process of the above method, reference may be made to the corresponding content disclosed in the foregoing embodiments, which will not be repeated here.

Further, the present invention also discloses a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, the infrared temperature measurement method disclosed above is implemented.

For a more specific process of the above method, reference may be made to the corresponding content disclosed in the foregoing embodiments, which will not be repeated here.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments may be referred to each other. For the apparatuses, devices, and storage media disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple, and reference may be made to the descriptions of the methods for related parts.

Professionals may further realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the possibilities of hardware and software. Interchangeability, the above description has generally described the components and steps of each example in terms of function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

The steps of a method or algorithm described in conjunction with the embodiments disclosed herein may be directly implemented in hardware, a software module executed by a processor, or a combination of the two. A software module can be placed in random access memory (RAM), internal memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other in the technical field. in any other known form of storage medium.

An infrared temperature measurement method provided by an embodiment of the present invention includes: acquiring a temperature actually measured by an infrared imaging system on a target; performing atmospheric attenuation correction on the acquired temperature according to environmental variables and a normalized spectral response function of the infrared imaging system , obtain the first temperature data; establish the functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtain the target proportion correction function; according to the obtained target proportion function and the imaging radius of the target, the first The temperature data is subjected to target imaging ratio correction to obtain second temperature data. The above infrared temperature measurement method introduces a two-variable (atmospheric attenuation and target size) correction method, and combines the actual environment to correct the attenuation with distance, which improves the reliability of temperature measurement for medium and long-distance targets (such as 500m ~ 2km+) in different environments In addition, the non-calibration scheme is used to correct the temperature drift problem of infrared detectors. Under the premise of meeting the accuracy requirements, the workload is greatly reduced, and the traditional single-band calibration temperature measurement scheme is solved. At the same time, it can monitor the high temperature target in time, and realize the preventive temperature measurement and inspection functions such as forest fire prevention and fire warning. In addition, the present invention also provides a corresponding device, device and computer-readable storage medium for the infrared temperature measurement method, which further makes the above method more practical, and the device, device and computer-readable storage medium have corresponding advantages.

Finally, it should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply these entities or that there is any such actual relationship or sequence between operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

The infrared temperature measurement method, device, equipment and storage medium provided by the present invention have been introduced in detail above. Specific examples are used in this paper to illustrate the principles and implementations of the present invention. The descriptions of the above examples are only used to help understanding The method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be It is construed as a limitation of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims (10)

1. An infrared temperature measurement method, comprising:

   Obtain the temperature actually tested by the infrared imaging system on the target;

   Perform atmospheric attenuation correction on the acquired temperature according to the environmental variables and the normalized spectral response function of the infrared imaging system to obtain first temperature data;

   establishing a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and obtaining a target proportion correction function;

   According to the acquired target ratio function and the imaging radius of the target, the target imaging ratio correction is performed on the first temperature data to obtain second temperature data.
2. The infrared temperature measurement method according to claim 1, wherein, according to environmental variables and the normalized spectral response function of the infrared imaging system, atmospheric attenuation correction is performed on the acquired temperature to obtain first temperature data, Specifically include:

   Obtain the spectral transmittance and scattering function of different atmospheric components to infrared radiation, and obtain the atmospheric attenuation coefficient of the infrared imaging system;

   Correcting the obtained atmospheric attenuation coefficient according to the normalized spectral response function of the infrared imaging system;

   Perform atmospheric attenuation correction on the acquired temperature according to the corrected atmospheric attenuation coefficient to obtain first temperature data.
3. Infrared temperature measurement method according to claim 2, is characterized in that, adopts following formula to correct the atmospheric attenuation coefficient obtained:

   

   

   

   C ₁ =3.7415×10 ⁸ W·μm ⁴ /m ²

   C ₂ =1.43879×10 ⁴ μm·K

   where τ _re is the modified atmospheric attenuation coefficient;

   

   is the absorption rate of CO ₂ to infrared radiation in different bands;

   

   is the absorption rate of H ₂ O to infrared radiation in different bands; τ _Aero is the scattering function of aerosol to infrared radiation; λ is the response wavelength of the infrared imaging system; [λ ₁ ,λ ₂ ] is the infrared imaging system Response band; x is the external input target distance, CO ₂ content, relative humidity, ambient temperature, visibility; SRF _sys is the normalized spectral response function of the infrared imaging system; SRF _Dete is the normalized spectral response of the detector function; Transmittance _Lens is the normalized transmittance function of the infrared lens to infrared radiation in different bands; M _bλ is the infrared spectral radiation emittance of an ideal black body; T is the temperature value used for normalizing the radiance.
4. Infrared temperature measurement method according to claim 3, is characterized in that, adopts following formula to obtain first temperature data:

   

   Wherein, T _out1 is the first temperature data; e is the target emissivity; T _m is the acquired temperature; T _env is the ambient temperature; n is determined by Boltzmann's theorem of the response band.
5. The infrared temperature measurement method according to claim 4, wherein a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target is established, and the target proportion correction function is obtained, which specifically includes:

   Align the optical axis of the infrared imaging system with a circular black body of the same temperature and different radii, so that the black body is imaged in the center of the screen, and obtain the output energy of the center point of the infrared imaging system;

   Using the radius of the pixel occupied by the black body in the infrared imaging system as an independent variable, establish a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target;

   The established functional relationship is normalized to obtain a target proportion correction function, and the obtained target proportion correction function is pre-stored in the processor of the infrared imaging system.
6. The infrared temperature measurement method according to claim 5, wherein, before performing target imaging ratio correction on the first temperature data according to the acquired target ratio function and the target imaging radius, the method further comprises:

   Select any point in the target image, perform the difference operation along the row and column directions of the point, and obtain the approximate length and width of the connected domain of the point;

   According to the obtained approximate length and width of the connected domain, the radius of the equal-area circle corresponding to the connected domain is obtained, and the radius of the equal-area circle is used as the imaging radius of the target.
7. Infrared temperature measurement method according to claim 6, is characterized in that, adopts following formula to obtain second temperature data:

   

   θ(r)=E(r)/E(r _max )=a*r^b+1

   Wherein, T _out2 is the second temperature data; height and width are the obtained approximate length and width of the connected domain, respectively; r' is the radius of the equal-area circle; θ is the target ratio correction function, E(r) is the output energy of the center point of the infrared imaging system when the radius of the pixel occupied by the black body in the infrared imaging system is r; E(r _max ) is the center when the black body occupies the full screen Point output; a and b are determined by θ, E(r) and E(r _max ).
8. An infrared temperature measuring device, comprising:

   The test temperature acquisition module is used to acquire the temperature actually tested by the infrared imaging system on the target;

   an atmospheric attenuation correction module, configured to perform atmospheric attenuation correction on the acquired temperature according to environmental variables and the normalized spectral response function of the infrared imaging system to obtain first temperature data;

   A correction function acquisition module, configured to establish a functional relationship between the output energy of the center point of the infrared imaging system and the imaging radius of the target, and to acquire a target proportion correction function;

   The imaging ratio correction module is configured to perform target imaging ratio correction on the first temperature data according to the acquired target ratio function and the imaging radius of the target to obtain second temperature data.
9. An infrared temperature measurement device, characterized in that it comprises a processor and a memory, wherein the processor implements the infrared temperature measurement method according to any one of claims 1 to 7 when the processor executes a computer program stored in the memory .
10. A computer-readable storage medium, characterized in that it is used for storing a computer program, wherein when the computer program is executed by a processor, the infrared temperature measurement method according to any one of claims 1 to 7 is implemented.

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