CN112484861B - Infrared temperature measurement method, device, equipment and storage medium - Google Patents
Infrared temperature measurement method, device, equipment and storage medium Download PDFInfo
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Abstract
The application discloses an infrared temperature measurement method, an infrared temperature measurement device, equipment and a storage medium, wherein the method comprises the following steps: acquiring the temperature actually tested by an infrared imaging system on a target; according to the environment variable and the normalized spectral response function of the infrared imaging system, atmospheric attenuation correction is carried out on the obtained temperature to obtain first temperature data; establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of the target, and acquiring a target proportion correction function; and 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 the method, the complexity of a traditional single-waveband calibration temperature measurement scheme can be solved, meanwhile, the temperature measurement accuracy of a medium-distance target and a long-distance target is improved, a high-temperature target can be monitored in time, and preventive temperature measurement inspection functions such as forest fire prevention and fire early warning are realized.
Description
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
The infrared imaging temperature measurement technology is widely applied to the fields of infrared detection, infrared remote sensing, military target measurement, industrial monitoring, forest fire prevention and the like. Because the infrared temperature measurement principle is complex, a large number of factors (including lens parameters, environment variables, distance coefficients, target emissivity, drift of infrared detector output and the like) influencing the temperature measurement accuracy exist, and therefore, a better temperature measurement application scheme and algorithm are difficult to have all the time in the field of remote temperature measurement.
At present, for an infrared imaging system, a traditional single-band calibration temperature measurement scheme is generally used, but the temperature measurement performance within 100m can only be ensured; and in combination with Planck's radiation law, a two-band thermometry method can be adopted, but a two-band lens needs to be equipped, and the application field is concentrated on high altitude measurement of more than 10km, so that the cost is high, and the application is less in civil products. In addition, the calibration coefficient or the univariate empirical formula is used for correcting the remote attenuation, the application applicability to different environmental temperatures and different lenses is low, the calibration is complex, and no good application scheme exists for the wide-field/remote temperature measurement requirements of forest fire prevention, fire early warning and the like.
Therefore, how to solve the problems of complexity of the temperature measurement scheme and improvement of the accuracy of the temperature measurement in the middle and long distances is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides an infrared temperature measurement method, apparatus, device and storage medium, which can solve the complexity of the traditional single-band calibration temperature measurement scheme and improve the accuracy of temperature measurement of the medium-distance and long-distance targets. The specific scheme is as follows:
an infrared temperature measurement method comprises the following steps:
acquiring the temperature actually tested by an infrared imaging system on a target;
according to the environment variable and the normalized spectral response function of the infrared imaging system, performing atmospheric attenuation correction on the obtained temperature to obtain first temperature data;
establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of the target, and acquiring a target proportion correction function;
and 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.
Preferably, in the infrared temperature measurement method provided in the embodiment of the present invention, according to an environmental variable and a normalized spectral response function of the infrared imaging system, atmospheric attenuation correction is performed on the acquired temperature to obtain first temperature data, and the method specifically includes:
acquiring spectral transmittance and scattering functions of different atmospheric components to infrared radiation to obtain an 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;
and according to the corrected atmospheric attenuation coefficient, performing atmospheric attenuation correction on the obtained temperature to obtain first temperature data.
Preferably, in the infrared temperature measurement method provided in the embodiment of the present invention, the obtained atmospheric attenuation coefficient is corrected by using the following formula:
C1＝3.7415×108W·μm4/m2
C2＝1.43879×104μm·K
wherein, taureThe corrected atmospheric attenuation coefficient;
is CO2Absorption rates for infrared radiation of different wavebands;
is H2The absorptivity of O to infrared radiation of different wave bands; tau isAeroAs a function of the scattering of infrared radiation by the aerosol; λ is the response wavelength of the infrared imaging system; [ lambda ]1,λ2]Is the response band of the infrared imaging system; x is the externally inputted target distance, CO2Content, relative humidity, ambient temperature, visibility; SRFsysIs a normalized spectral response function of the infrared imaging system; SRFDeteIs a normalized spectral response function of the detector; transmitanceLensIs a normalized transmittance function of the infrared lens to infrared radiation of different wave bands; mbλInfrared spectrum radiation emittance of an ideal black body; t is the temperature value used for normalizing the radiance.
Preferably, in the infrared temperature measurement method provided in the embodiment of the present invention, the following formula is adopted to obtain the first temperature data:
wherein, Tout1Is the first temperature data; e is the target emissivity; t ismFor said temperature obtained; t isenvIs ambient temperature; n is determined by boltzmann's theorem of the response band.
Preferably, in the infrared temperature measurement method provided in the embodiment of the present invention, establishing a functional relationship between the output energy of the central point of the infrared imaging system and the imaging radius of the target, and obtaining the target proportion correction function specifically includes:
aligning the optical axis of the infrared imaging system to round black bodies with the same temperature and different radiuses, so that the black bodies are imaged in the center of a picture, and acquiring the output energy of the central point of the infrared imaging system;
taking the radius of the pixel occupied by the black body in the infrared imaging system as an independent variable, and establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of a target;
normalizing the established function relation to obtain a target proportion correction function, and pre-storing the obtained target proportion correction function in a processor of the infrared imaging system.
Preferably, in the above infrared temperature measurement method provided in the embodiment of the present invention, before performing target imaging proportion correction on the first temperature data according to the obtained target proportion function and the imaging radius of the target, the method further includes:
selecting any point in the target imaging, and carrying out differential operation along the row and column directions of the point to obtain the approximate length and width of the point connected domain;
and according to the obtained approximate length and width of the connected domain, obtaining the radius of an equal-area circle corresponding to the connected domain, and taking the radius of the equal-area circle as the imaging radius of the target.
Preferably, in the infrared temperature measurement method provided in the embodiment of the present invention, the following formula is adopted to obtain the second temperature data:
θ(r)＝E(r)/E(rmax)＝a*r^b+1
wherein, Tout2Is the second temperature data; height and width are respectively the approximate length and width of the obtained connected domain; r' is the radius of the circle of equal area; theta is the target proportion correction function, E (r) is the output energy of the central 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) Outputting the black body to the central point when the black body occupies the full screen; a and b are formed by theta, E (r) and E (r)max) And (6) determining.
The embodiment of the invention also provides an infrared temperature measuring device, which comprises:
the test temperature acquisition module is used for acquiring the temperature actually tested by the infrared imaging system on the target;
the atmospheric attenuation correction module is used for performing atmospheric attenuation correction on the acquired temperature according to an environment variable and a normalized spectral response function of the infrared imaging system to obtain first temperature data;
the correction function acquisition module is used for establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of the target and acquiring a target proportion correction function;
and the imaging proportion correction module is used for carrying out target imaging proportion correction on the first temperature data according to the obtained target proportion function and the imaging radius of the target to obtain second temperature data.
The embodiment of the invention also provides infrared temperature measurement equipment which comprises a processor and a memory, wherein the processor executes the computer program stored in the memory to realize the infrared temperature measurement method provided by the embodiment of the invention.
The embodiment of the present invention further provides a computer-readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the above infrared temperature measurement method provided in the embodiment of the present invention.
According to the technical scheme, the infrared temperature measurement method provided by the invention comprises the following steps: acquiring the temperature actually tested by an infrared imaging system on a target; according to the environment variable and the normalized spectral response function of the infrared imaging system, atmospheric attenuation correction is carried out on the obtained temperature to obtain first temperature data; establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of the target, and acquiring a target proportion correction function; and 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.
According to the infrared temperature measurement method provided by the invention, a bivariate (atmospheric attenuation and target size) correction mode is introduced, the random attenuation condition is corrected by combining with the actual environment, the temperature measurement reliability, accuracy and universality of a medium-distance target (such as 500 m-2 km +) in different environments are improved, a non-calibration scheme is used for correcting the temperature drift problem of the infrared detector, the workload is greatly reduced on the premise of meeting the precision requirement, the complexity of the traditional single-waveband calibration temperature measurement scheme is solved, meanwhile, the high-temperature target can be timely monitored, and the preventive temperature measurement inspection functions of forest fire prevention, fire early warning and the like are realized. In addition, the invention also provides a corresponding device, equipment and a computer readable storage medium aiming at the infrared temperature measurement method, so that the method has higher practicability, and the device, the equipment and the computer readable storage medium have corresponding advantages.
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In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flowchart of an infrared temperature measurement method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a point spread function provided by an embodiment of the present invention;
fig. 3 is a flowchart of obtaining a target proportion correction function according to an embodiment of the present invention;
FIG. 4 is a flowchart for obtaining an imaging radius of a target according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an infrared temperature measuring device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an infrared temperature measurement method, as shown in figure 1, comprising the following steps:
s101, acquiring the temperature actually tested by an infrared imaging system on a target;
in practical application, the temperature actually tested by the infrared imaging system on a target is realized through a basic temperature measurement algorithm;
s102, according to the environment variable and the normalized spectral response function of the infrared imaging system, performing atmospheric attenuation correction on the acquired temperature to obtain first temperature data;
it should be noted that, when the conventional atmospheric attenuation correction scheme is applied, only the influence of the external environment is usually considered, and the influence of the spectral response function of the imaging system on the atmospheric attenuation correction scheme is ignored, so that the atmospheric attenuation coefficient is further corrected by referring to the attenuation condition of the atmospheric window at the low sea level in the long-wavelength infrared region and introducing the spectral response function of the optical system, so that the atmospheric attenuation coefficient is closer to the practical application;
s103, establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of the target, and acquiring a target proportion correction function;
it can be understood that, since the point spread function PSF exists in the optical lens for the point light source radiation, that is, the square distribution of the output radiation generated by the point light source after passing through the optical imaging system, the demonstration diagram is shown in fig. 2. Due to the linear nature of the optical imaging system, an image at a point can be considered to be the sum of the PSFs at each point within the image. For infrared imaging systems, in addition to the attenuation of the input radiation as the target distance increases, the output radiation of the imaging system is the result of the convolution of the input radiation with the PSF:
the input radiation is acquired, and deconvolution operation can be carried out or a correction matrix is constructed for accurate correction and the like. The point spread function is complex to obtain, and a convolution kernel required by accurate correction is too large, so that engineering application is not facilitated. Therefore, the temperature is corrected simply and quickly by adopting a target imaging ratio correction mode;
and S104, performing target imaging ratio correction on the first temperature data according to the obtained target ratio function and the imaging radius of the target to obtain second temperature data.
In the infrared temperature measurement method provided by the embodiment of the invention, a bivariate (atmospheric attenuation and target size) correction mode is introduced, the random attenuation condition is corrected by combining with the actual environment, the temperature measurement reliability, accuracy and universality of a medium-distance target (such as 500 m-2 km +) in different environments are improved, a non-calibration scheme is used for correcting the temperature drift problem of an infrared detector, the workload is greatly reduced on the premise of meeting the precision requirement, the complexity of the traditional single-waveband calibration temperature measurement scheme is solved, meanwhile, the high-temperature target can be monitored in time, and the preventive temperature measurement inspection functions of forest fire prevention, fire early warning and the like are realized.
Further, in a specific implementation, in the infrared temperature measurement method provided in the embodiment of the present invention, the step S102 performs atmospheric attenuation correction on the acquired temperature according to the environmental variable and the normalized spectral response function of the infrared imaging system to obtain the first temperature data, which may specifically include the following steps:
acquiring spectral transmittance and scattering functions of different atmospheric components to infrared radiation to obtain an atmospheric attenuation coefficient of an infrared imaging system;
in practical applications, CO is mainly considered for long-range long-wavelength infrared radiation with altitude near the horizontal plane (less than 1km)2/H2O absorption of radiation, and scattering of infrared radiation by aerosol impurities. In an embodiment, the spectral transmittance of different atmospheric components to infrared radiation and the scattering function can be obtained by using a table lookup method to obtain the response band [ lambda ] of the imaging system1,λ2]The atmospheric attenuation coefficient τ (x) of (a):
wherein the content of the first and second substances,
is CO2The absorptivity of infrared radiation of different wave bands can be obtained by looking up a table, and 400ppm data can be used;
is H2The absorptivity of O to infrared radiation of different wave bands can be obtained by looking up a table; tau isAeroAs a function of the scattering of infrared radiation by the aerosol; lambda is the response wavelength of the infrared imaging system; [ lambda ]1,λ2]The response waveband of the infrared imaging system is determined by the design of the infrared imaging system and can be obtained by testing of a spectral response testing system; x is the externally inputted target distance, CO2Content, relative humidity, ambient temperature, visibility;
correcting the obtained atmospheric attenuation coefficient according to the normalized spectral response function of the infrared imaging system;
it should be noted that the response band λ of the infrared imaging system can be first confirmed by the following formula1,λ2]Corresponding normalized spectral response function:
C1＝3.7415×108W·μm4/m2
C2＝1.43879×104μm·K
wherein, SRFsysIs a normalized spectral response function of the infrared imaging system; SRFDeteThe function is a normalized spectral response function of the detector, reflects the response condition of the infrared detector to different wave bands, is determined by the design of the detector and can be obtained through spectral test; transmitanceLensThe normalized transmittance function of the infrared lens for infrared radiation of different wave bands is determined by lens materials and optical design and can be obtained through testing; mbλInfrared spectrum radiation emittance of an ideal black body; t is a temperature value used for normalizing the radiometric degree, and a median value of a testing range of an imaging system is used for approximately representing a temperature measuring range, wherein if the target temperature measuring range is 0-150 ℃, T is 75 ℃;
the resulting atmospheric attenuation coefficient can then be corrected using the following equation:
wherein, taureThe corrected atmospheric attenuation coefficient;
step three, according to the corrected atmospheric attenuation coefficient, atmospheric attenuation correction is carried out on the obtained temperature, and first temperature data are obtained;
specifically, the infrared radiation received by the infrared imaging system mainly comprises three parts: the energy emitted by the target, the energy reflected by the target, and the energy of the atmospheric environment, according to the underlying infrared physics, may be obtained by using the following formula:
wherein, Tout1Is first temperature data; e is the target emissivity; t is a unit ofmIs the temperature obtained; t isenvIs ambient temperature; n is determined by boltzmann's theorem of the response band; eaimEnergy emitted for the target; erefEnergy reflected for the target; eenvIs the energy of the atmospheric environment.
In a specific implementation, in the infrared temperature measurement method provided in the embodiment of the present invention, the step S103 establishes a functional relationship between the output energy of the central point of the infrared imaging system and the imaging radius of the target, and obtains the target proportion correction function, which may specifically include the following steps:
firstly, aligning the optical axis of an infrared imaging system to round black bodies with the same temperature and different radiuses, imaging the black bodies in the center of a picture, and acquiring output energy E of the center point of the infrared imaging system; in practical application, the infrared imaging system and the black body need to be separated by a certain distance l, wherein the distance l is the minimum imaging distance of the infrared imaging system, namely the minimum distance of the black body with clear edge;
then, taking the radius of a pixel occupied by the black body in the infrared imaging system as an independent variable, and establishing a functional relation between the output energy E of the central point of the infrared imaging system and the imaging radius of the target; specifically, the function relationship is E ═ f (r);
and finally, normalizing the established function relation to obtain a target proportion correction function, and pre-storing the obtained target proportion correction function in a 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 output energy of the central 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) Outputting the black body to the central point when the full screen is occupied; a and b are formed by theta, E (r) and E (r)max) And (6) determining. When the imaging radius of the object is r',the target proportion correction function is θ (r ') ═ a × r' ^ b + 1.
Specifically, as shown in fig. 3, according to the temperature measurement results of black bodies with different radii, the radii of pixels occupied by the black bodies with different radii in the imaging system are used as independent variables ([ r1, r2, r3, r4]), and the temperature measurement results of the center points of the black bodies with different radii in the infrared imaging system are normalized to be used as dependent variables ([ t1, t2, t3, t4]/t 5); and obtaining a target proportion correction function theta (r) ═ a × r ^ b +1, fitting the target proportion correction function theta (r) ═ a × r ^ b +1, and finally storing a fitting formula of the target proportion correction function in the imaging system processor.
In specific implementation, before performing step S104 to perform target imaging proportion correction on the first temperature data according to the obtained target proportion function and the imaging radius of the target, the method according to the embodiment of the present invention may further include: firstly, selecting any point (such as forest fire point, and selecting a point with the temperature exceeding 350 ℃) in target imaging, and carrying out differential operation along the row and column directions of the point to obtain the approximate length and width of a connected domain of the point; then, according to the obtained approximate length and width of the connected domain, the radius of the circle with the equal area corresponding to the connected domain is obtained, and the radius of the circle with the equal area is used as the imaging radius of the target.
Specifically, a temperature imaging matrix dataT is set, the height of an imaging image is H, the width of the imaging image is W, and as shown in FIG. 4, coordinates [ i0, j0] of any point in a temperature measurement target in the imaging are selected; and (3) differentiating the point [ i0, j0] in the horizontal direction and the vertical direction (namely the row and column directions) to obtain the number of pixels occupied by the temperature measurement object in the horizontal direction and the vertical direction, namely obtaining the approximate length and width of a connected domain containing the temperature measurement object:
first, differential operation is performed on the row direction of the target point (matlab code is as follows):
Row_dif＝diff(dataT(i0,:))；
Col_dif＝diff(dataT(:,j0))；
wherein Row _ dif is Row differential data; col _ dif is column difference data;
secondly, obtaining the coordinate between the maximum and minimum values in the row/column differential data, namely the edge with the maximum change in the row and column directions of the target point, wherein 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)；
wherein, height and width are the approximate length and width of the obtained connected domain respectively.
Then, according to the height and width of the obtained connected domain, the radius of the circle with the same area corresponding to the connected domain is obtained
In specific implementation, in the infrared temperature measurement method provided in the embodiment of the present invention, the following formula is adopted to obtain the second temperature data:
wherein, Tout2Second temperature data.
Through practical tests, the temperature measurement precision of the invention for targets with different temperatures and different sizes can reach +/-10 ℃ within 1 kilometer, and the invention is far superior to the result without the correction scheme.
Based on the same inventive concept, the embodiment of the invention also provides an infrared temperature measuring device, and as the principle of solving the problems of the infrared temperature measuring device is similar to that of the infrared temperature measuring method, the implementation of the infrared temperature measuring device can refer to the implementation of the infrared temperature measuring method, and repeated parts are not repeated.
In specific implementation, as shown in fig. 5, the infrared temperature measuring device provided in the embodiment of the present invention specifically includes:
the test temperature acquisition module 11 is used for acquiring the temperature actually tested by the infrared imaging system on the target;
the atmospheric attenuation correction module 12 is configured to perform atmospheric attenuation correction on the acquired temperature according to the environmental variable and the normalized spectral response function of the infrared imaging system to obtain first temperature data;
the correction function acquisition module 13 is configured to establish a functional relationship between the output energy of the central point of the infrared imaging system and the imaging radius of the target, and acquire a target proportion correction function;
and the imaging proportion correction module 14 is configured to perform target imaging proportion correction on the first temperature data according to the obtained target proportion function and the imaging radius of the target, so as to obtain second temperature data.
In the infrared temperature measuring device provided by the embodiment of the invention, the complexity of the traditional single-band calibration temperature measuring scheme can be solved through the interaction of the four modules, meanwhile, the temperature measuring accuracy of a medium-distance target and a long-distance target is improved, the high-temperature target can be monitored in time, and the preventive temperature measuring and checking functions of forest fire prevention, fire early warning and the like are realized.
For more specific working processes of the modules, reference may be made to corresponding contents disclosed in the foregoing embodiments, and details are not repeated here.
Correspondingly, the embodiment of the invention also discloses infrared temperature measurement equipment, which comprises a processor and a memory; the processor executes the computer program stored in the memory to implement the infrared temperature measurement method disclosed in the foregoing embodiments.
For more specific processes of the above method, reference may be made to corresponding contents disclosed in the foregoing embodiments, and details are not repeated here.
Further, the present invention also discloses a computer readable storage medium for storing a computer program; the computer program, when executed by a processor, implements the infrared thermometry method disclosed above.
For more specific processes of the above method, reference may be made to corresponding contents disclosed in the foregoing embodiments, and details are not repeated here.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. The device, the equipment and the storage medium disclosed by the embodiment correspond to the method disclosed by the embodiment, so that the description is relatively simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The embodiment of the invention provides an infrared temperature measurement method, which comprises the following steps: acquiring the temperature actually tested by an infrared imaging system on a target; according to the environment variable and the normalized spectral response function of the infrared imaging system, atmospheric attenuation correction is carried out on the obtained temperature to obtain first temperature data; establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of the target, and acquiring a target proportion correction function; and 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. According to the infrared temperature measurement method, a bivariate (atmospheric attenuation and target size) correction mode is introduced, the random attenuation condition is corrected by combining with the actual environment, the temperature measurement reliability, the accuracy and the universality of a medium-distance target (such as 500 m-2 km +) in different environments are improved, the temperature drift problem of the infrared detector is corrected by using a non-calibration scheme, the workload is greatly reduced on the premise of meeting the precision requirement, the complexity of the traditional single-waveband calibration temperature measurement scheme is solved, meanwhile, the high-temperature target can be timely monitored, and the preventive temperature measurement inspection functions of forest fire prevention, fire early warning and the like are realized. In addition, the invention also provides a corresponding device, equipment and a computer readable storage medium aiming at the infrared temperature measurement method, so that the method has higher practicability, and the device, the equipment and the computer readable storage medium have corresponding advantages.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The method, the device, the equipment and the storage medium for infrared temperature measurement provided by the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. An infrared temperature measurement method is characterized by comprising the following steps:
acquiring the temperature actually tested by an infrared imaging system on a target;
according to the environment variable and the normalized spectral response function of the infrared imaging system, performing atmospheric attenuation correction on the obtained temperature to obtain first temperature data;
aligning the optical axis of the infrared imaging system to round black bodies with the same temperature and different radiuses, so that the black bodies are imaged in the center of a picture, and acquiring the output energy of the central point of the infrared imaging system;
taking the radius of the pixel occupied by the black body in the infrared imaging system as an independent variable, and establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of a target;
normalizing the established function relation to obtain a target proportion correction function, and pre-storing the obtained target proportion correction function in a processor of the infrared imaging system;
selecting any point in the target imaging, and carrying out differential operation along the row and column directions of the point to obtain the approximate length and width of the point connected domain;
obtaining the radius of an equal-area circle corresponding to the connected domain according to the obtained approximate length and width of the connected domain, and taking the radius of the equal-area circle as the imaging radius of a target;
according to the obtained target proportion correction function and the imaging radius of the target, performing target imaging proportion correction on the first temperature data, and obtaining second temperature data by adopting the following formula:
θ(r)＝E(r)/E(rmax)＝a*r^b+1
wherein, Tout2Is the second temperature data; t isout1Is the first temperature data; height and width are respectively acquisitionThe approximate length and width of the connected domain of (a); r' is the radius of the circle of equal area; theta is the target proportion correction function, E (r) is the output energy of the central 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) Outputting the black body to the central point when the black body occupies the full screen; a and b are formed by theta, E (r) and E (r)max) And (6) determining.
2. The infrared temperature measurement method according to claim 1, wherein performing atmospheric attenuation correction on the obtained temperature according to an environmental variable and a normalized spectral response function of the infrared imaging system to obtain first temperature data, specifically comprising:
acquiring spectral transmittance and scattering functions of different atmospheric components to infrared radiation to obtain an 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;
and according to the corrected atmospheric attenuation coefficient, performing atmospheric attenuation correction on the obtained temperature to obtain first temperature data.
3. The infrared temperature measurement method according to claim 2, wherein the obtained atmospheric attenuation coefficient is corrected by using the following formula:
C1＝3.7415×108W·μm4/m2
C2＝1.43879×104μm·K
wherein, taureThe corrected atmospheric attenuation coefficient;
is CO2Absorption rates for infrared radiation of different wavebands;
is H2The absorptivity of O to infrared radiation of different wave bands; tau isAeroAs a function of the scattering of infrared radiation by the aerosol; λ is the response wavelength of the infrared imaging system; [ lambda ]1,λ2]Is the response band of the infrared imaging system;
x in (1) is target distance and CO input from outside2Content (c);
x in (1) is target distance, relative humidity and ambient temperature input from outside; tau isAeroX in (λ, x) is an externally input target distance and visibility; SRFsysIs a normalized spectral response function of the infrared imaging system; SRFDeteIs a normalized spectral response function of the detector; transmitanceLensIs a normalized transmittance function of the infrared lens to infrared radiation of different wave bands; mbλInfrared spectrum radiation emittance of an ideal black body; t is the temperature value used for normalizing the radiance.
4. The infrared temperature measurement method according to claim 3, wherein the first temperature data is obtained by using the following formula:
wherein e is the target emissivity; t is a unit ofmFor said temperature obtained; t isenvIs ambient temperature; n is determined by boltzmann's theorem of the response band.
5. An infrared temperature measuring device, comprising:
the test temperature acquisition module is used for acquiring the temperature actually tested by the infrared imaging system on the target;
the atmospheric attenuation correction module is used for performing atmospheric attenuation correction on the acquired temperature according to an environment variable and a normalized spectral response function of the infrared imaging system to obtain first temperature data;
the correction function acquisition module is used for aligning the optical axis of the infrared imaging system to round black bodies with the same temperature and different radiuses, so that the black bodies are imaged in the center of a picture, and the output energy of the central point of the infrared imaging system is acquired; taking the radius of the pixel occupied by the black body in the infrared imaging system as an independent variable, and establishing a functional relation between the output energy of the central point of the infrared imaging system and the imaging radius of a target; normalizing the established function relation to obtain a target proportion correction function, and pre-storing the obtained target proportion correction function in a processor of the infrared imaging system;
the imaging proportion correcting module is used for selecting any point in target imaging, carrying out differential operation along the row and column directions of the point and obtaining the approximate length and width of the point connected domain; obtaining the radius of an equal-area circle corresponding to the connected domain according to the obtained approximate length and width of the connected domain, and taking the radius of the equal-area circle as the imaging radius of a target; according to the obtained target proportion correction function and the imaging radius of the target, performing target imaging proportion correction on the first temperature data, and obtaining second temperature data by adopting the following formula:
θ(r)＝E(r)/E(rmax)＝a*r^b+1
wherein, Tout2Is the second temperature data; t isout1Is the first temperature data; height and width are the approximate length and width of the obtained connected domain respectively; r' is the radius of the circle of equal area; theta is the target proportion correction function, E (r) is the output energy of the central 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) Outputting the black body to the central point when the black body occupies the full screen; a and b are formed by theta, E (r) and E (r)max) And (6) determining.
6. An infrared thermometry apparatus comprising a processor and a memory, wherein the processor, when executing a computer program stored in the memory, implements the infrared thermometry method of any one of claims 1 through 4.
7. A computer-readable storage medium for storing a computer program, wherein the computer program, when executed by a processor, implements the infrared thermometry method of any one of claims 1-4.
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