CN113029335B - Flame environment sparse space frequency ray-oriented identification extraction system and method - Google Patents
Flame environment sparse space frequency ray-oriented identification extraction system and method Download PDFInfo
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Abstract
The invention relates to a recognition and extraction system and a recognition and extraction method for sparse space frequency light rays facing a flame environment, wherein the recognition and extraction system comprises a light ray collection module, a light ray detection module and an imaging lens, wherein the light ray collection module is used for attenuating light rays through an optical attenuator and collecting flame radiation light rays with the same space frequency at the same position of an image space focal plane; the light identification module is used for allowing light with specific spatial frequency to reach the sensor array and enabling the sparse spatial frequency information sampled in parallel to be independent in a spectrum domain; the time domain spectrum module is used for distinguishing light rays and acquiring hyperspectral radiation information of the dynamic flame in a time domain. The light is collected through the collecting module and transmitted to the light identification module for identification and extraction, the light after identification and extraction is transmitted to the time domain spectrum module, the time domain spectrum module distinguishes and extracts information on the light transmitted by the light identification module, and sparse space frequency information of flame radiation light and spectrum information carried by the sparse space frequency information can be synchronously acquired in a time domain.
Description
Technical Field
The invention relates to the technical field of light identification and extraction, in particular to a flame environment-oriented sparse space frequency light identification and extraction system.
Background
The light rays are straight lines representing the propagation path and direction of the light, the purpose of sparse representation of the signals is to represent the signals in a given overcomplete dictionary by using as few atoms as possible, and a more concise representation mode of the signals can be obtained, so that information contained in the signals can be obtained more easily, the signals can be processed more conveniently, the spectrum information carried in the existing light signals is easily interfered by other factors in the outputting and identifying processes, the light signals are free of information, and a system and a method for outputting and identifying sparse space frequency light information in a flame-oriented environment are also lacking in the prior art.
Disclosure of Invention
Therefore, the invention provides a flame environment-oriented sparse space frequency ray identification and extraction system and method, which are used for solving the problem that a system and method for outputting and identifying sparse space frequency ray information in a flame environment-oriented environment is lacked in the prior art.
In order to achieve the above object, the present invention provides a system for identifying and extracting sparse space frequency light rays oriented to flame environment, comprising:
the light collecting module comprises a light attenuator, one end of the light attenuator receives light, the other end of the light attenuator is connected with an imaging lens of the light attenuator, the light attenuator is used for avoiding image oversaturation and damage to the system, the imaging lens is used for collecting flame radiation light rays with the same spatial frequency at the same position of an image side focal plane of the imaging lens, and the light collecting module is used for attenuating the light rays through the light attenuator and collecting the flame radiation light rays with the same spatial frequency attenuated by the light attenuator at the same position of the image side focal plane through the imaging lens;
a light identification module comprising an optical filter to allow light of a specific spatial frequency to reach the sensor array and to make the parallel sampled sparse spatial frequency information independent of each other in the spectral domain;
the time domain spectrum module comprises a video hyperspectral sensor and is used for distinguishing wavelength information contained in light rays and acquiring hyperspectral radiation information of dynamic flames in a time domain through a video gray-scale camera;
the light is collected and transmitted to the light identification module through the light collection module for identification and extraction, the identified and extracted light is transmitted to the time domain spectrum module, the time domain spectrum module distinguishes and extracts information of the light transmitted by the light identification module, and the flame sparse space frequency radiation light and the spectrum information carried by the flame sparse space frequency radiation light can be synchronously acquired in the time domain.
Further, the light attenuator in the light collection module is configured as a double-line polarizer, which is configured to avoid image saturation and damage to the system caused by intense flame radiation.
Further, the dual-line polarizer is capable of varying degrees of light attenuation by controlling the angle between the two polarization axes based on the Malus' law.
Further, the imaging lens is configured as an achromatic lens.
Further, the optical filter is a sparse spatial filter arranged at different positions of the Fourier spatial spectrum surface and used for identifying light rays.
Further, filters of different bandpass bands are jointly arranged at different spatial filter positions, so that the sparse spatial frequency information sampled in parallel is mutually independent in a spectrum domain and light rays are extracted.
Further, the video hyperspectral sensor adopts a combination mode of a mask prism structure to distinguish wavelength information contained in light.
Further, the light rays processed by the mask prism structure in the time domain spectrum module are transmitted to a video gray scale camera, and the video gray scale camera acquires hyperspectral radiation information of the dynamic flame in a time domain.
Furthermore, the light collection module, the light identification module and the time domain spectrum module can synchronously acquire flame sparse space frequency radiation light and spectrum information carried by the flame sparse space frequency radiation light in a time domain through cooperative work.
Further, the method for identifying and extracting the sparse space frequency light rays facing the flame environment comprises the following steps:
step one: the light collecting module attenuates light through the light attenuator and transmits the light attenuated by the light attenuator to the achromat;
step two: transmitting the light collected by the achromatic lens to a light identification module, wherein sparse spatial filters are arranged at different positions of a Fourier space spectrum surface in the light identification module to identify and transmit the light, and filters with different band-pass bands are combined at different spatial filter positions to identify and extract the space frequency information according to wavelength characteristics;
step three: the light rays which are identified and extracted by the light ray identification module are transmitted to the time domain spectrum module, the time domain spectrum module distinguishes the light rays by wavelength information through a mask prism structure, and hyperspectral radiation information of dynamic flames is obtained in a time domain by a video gray-scale camera.
Compared with the prior art, the invention has the beneficial effects that by providing the recognition and extraction system for the sparse space frequency light rays facing the flame environment, the light rays are collected and transmitted to the light ray recognition module for recognition and extraction through the light ray collection module, the light rays after recognition and extraction are transmitted to the time domain spectrum module, and the time domain spectrum module distinguishes and extracts information on the light rays transmitted by the light ray recognition module, so that the sparse space frequency radiation light rays of the flame and the spectrum information carried by the sparse space frequency radiation light rays of the flame can be synchronously acquired in a time domain.
In particular, light is attenuated by a light attenuation structure in the light collecting module, the light after light attenuation is transmitted to the imaging lens, the light after being processed by the imaging lens enters the light identification module and is processed by a light filter of an optical axis, the light after being processed by the light filter enters the time domain spectrum module, the light is distinguished by a light splitting structure, and hyperspectral radiation information of dynamic flame is obtained in a time domain under the action of the video gray-scale camera.
Furthermore, the light collection module, the light identification module and the time domain spectrum module can synchronously acquire flame sparse space frequency radiation light and spectrum information carried by the flame sparse space frequency radiation light in a time domain through cooperative work.
In particular, the light recognition module is provided with sparse spatial filters at different positions of a Fourier spatial spectrum surface, the spatial filters can achieve that light with specific spatial frequencies reaches the sensor array, and the band-pass filters can enable sparse spatial frequency information sampled in parallel to be mutually independent in a spectrum domain through the filters with different band-pass bands which are jointly arranged at the positions of the different spatial filters, and the spatial frequency information can be recognized and extracted according to wavelength characteristics.
Drawings
FIG. 1 is a schematic diagram of a system for recognizing and extracting sparse spatial frequency light in a flame-oriented environment according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a tracking process of flame radiation rays according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a first process for spatial frequency matching of flames in the embodiment of the present invention;
FIG. 4 is a schematic diagram of a second process of spatial frequency matching of flames in the embodiment of the present invention;
FIG. 5 is a schematic diagram of a third process of spatial frequency matching of flames in the embodiment of the present invention.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," lower, "" left, "" right, "" inner, "" outer, "and the like are used for convenience of description and are not to be construed as limiting the present invention, as the terms" upper, "" lower, "" left, "" right, "" inner, "" outer, "" etc. refer to or are used for convenience of description only, but are not to indicate or imply that the apparatus or element must have a particular orientation, be constructed and operated in a particular orientation.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, the present invention provides a system for identifying and extracting sparse spatial frequency light rays oriented to flame environment, comprising:
a light collecting module, which comprises a light attenuator 1, wherein one end of the light attenuator 1 receives light, the other end of the light attenuator 1 is connected with an imaging lens 2 thereof, the light attenuator 1 is used for avoiding image oversaturation and damage to the system, the imaging lens 2 is used for collecting flame radiation light rays with the same spatial frequency at the same position of an image space focal plane, the light collecting module is used for attenuating the light rays through the light attenuator 1 and collecting the flame radiation light rays with the same spatial frequency after being attenuated by the light attenuator 1 at the same position of the image space focal plane through the imaging lens 2;
a light identification module comprising an optical filter 3, the optical filter 3 being configured to allow light of a specific spatial frequency to reach the sensor array and to make the parallel sampled sparse spatial frequency information mutually independent in the spectral domain;
the time domain spectrum module comprises a video hyperspectral sensor and is used for distinguishing wavelength information contained in light rays and acquiring hyperspectral radiation information of dynamic flames in a time domain through the video gray scale camera 5.
Specifically, in the embodiment of the invention, in the light collecting module, a double-line polaroid structure is adopted as an optical attenuator to avoid image saturation caused by strong flame radiation and damage to a photoelectric imaging system, and the light attenuation of different degrees is realized by controlling the included angle between two polarization axes based on Malus law; the achromatic lens 21 is used as the main component of the light collection module so that flame radiation rays having the same spatial frequency are collected at the same location of its image-side focal plane, fourier space spectrum plane. For the light identification module, sparse spatial filters are arranged at different positions of the Fourier space spectrum surface, and light rays with specific spatial frequencies are allowed to reach the sensor array; the filters with different band-pass bands are combined at different spatial filter positions, so that the sparse spatial frequency information sampled in parallel is mutually independent in a spectrum domain, and the spatial frequency information can be identified and extracted by wavelength features. The time domain spectrum module is composed of a video hyperspectral sensor, wavelength information contained in light is distinguished by adopting a mask prism structure combination mode, hyperspectral radiation information of dynamic flame is obtained in a time domain by combining a video gray-scale camera, and the sparse space frequency radiation light of the flame and the spectrum information carried by the sparse space frequency radiation light of the flame can be synchronously obtained in the time domain by the cooperative work of the light collecting module, the light identifying module and the time domain spectrum module.
Specifically, in the embodiment of the present invention, light is attenuated by the optical attenuator 1 in the light collecting module, and the light after being subjected to optical attenuation treatment is transmitted to the imaging lens 2, the light after being subjected to the processing of the imaging lens 2 enters the light identifying module and is processed by the optical filter 3 of the optical axis, the light after being subjected to the processing of the optical filter 3 enters the time domain spectrum module, the light is distinguished by the light splitting structure 4, and the hyperspectral radiation information of the dynamic flame is obtained in the time domain under the action of the video gray-scale camera 5.
Specifically, in the embodiment of the present invention, the light attenuator 1 in the light collecting module is configured as a double-line polarizer 11, and by arranging the double-line polarizer 11, image saturation caused by strong flame radiation and damage to the optoelectronic imaging system are avoided, and the double-line polarizer 11 can realize light attenuation of different degrees by controlling the included angle between two polarization axes based on the law of Malus.
Referring to FIGS. 2-5, a tracking and locating process of flame radiation rays is shown, during acquisition and identification of a fireAfter sparse space frequency information of flame radiation rays is obtained, the common emission source positions of the rays with different space frequencies are determined, the common emission source positions are overlapped with the center of a hyperspectral sensor array through an optical axis, an image side principal point of an achromatic lens is taken as an origin of an O-xyz coordinate system, the distance between the image side principal point and an object side principal point is d ', one radiation ray track of the flame is l', and the distance between the image side principal point and the object side principal point is equal to the distance between the image side principal point and the object side principal point of the achromatic lens (x A ,y A ,z A ) With the image-side focal plane point O' (x) o ,y o ,z o ) The position reaching the spectral sensor array is a' (x A' ,y A' ,z A ' s); l is the light passing through the principal achromat point with the same spatial frequency as l', and the intersection point of the light passing through the achromat point and the spectrum sensor array is O "(x) o” ,yo”,z o” ). From fourier optical knowledge, l and l 'are commonly intersected at the point of the image side focal plane O', and the following geometrical relationship exists:
△A00’～△A’0”0’
thus, the expression about the point A can be obtained as
The O ' point coordinates can be determined by the pixel locations in the sensor array, while the equation for the line O ' A ' can be determined from the locations of O ' and A ', with point A on line O ' A ' and satisfying the condition x A =0, and the spatial coordinate position of a can be obtained by combining the above conditions. According to the characteristic that the principal plane of the object and the principal plane of the image are in common and the vertical axis magnification is +l, the intersection point position of l' and the principal plane of the object can be further obtained, and the spatial frequency thereof meets the following relation
θ＝tan -1 (d”/f')，
Based on this, the linear equation of l' and its direction vector can be obtained.
Specifically, in the embodiment of the present invention, the band-pass filtering ranges of the spatial filter channels 1, 2, and 3 are different, and assuming that two different points A, B on the flame boundary pass through the channel 2 with the same spatial frequency, the radiation ray direction equations passing through a and B respectively in the spatial frequency can be solved, and the temperature characteristics corresponding to the radiation ray can be obtained by means of the hyperspectral information in the band of the channel 2 based on the planck radiation law; the radiation ray equation corresponding to the spatial filter channels 1 and 3 and the carried temperature information can be obtained in the same way. In the object space of the optical imaging system, the intersection point of the light rays with the same temperature information is the real position of the flame boundary, and the rest intersection points of the light rays are pseudo intersection points. Based on spectral radiation characteristics in the Planckian radiation law, hyperspectral radiation information of spatially filtered channel light can be restored. To avoid interference with the same temperature conditions at different locations of the flame boundary, 9 channels are provided in this embodiment to increase the accuracy of flame boundary location.
With continued reference to fig. 2-5, the spatial frequency light is again matched according to the directional radiation characteristics of planck's law of radiation. In the demodulation mechanism and method of hyperspectral radiation information in the full line of sight direction of flame, after the flame boundary is positioned, the normal direction of the positioning position boundary and the hyperspectral radiation characteristic in the full line of sight direction need to be further confirmed, and the specific demodulation mechanism and calculation method are as follows. When the radiation ray deviates from the normal direction of the flame boundary, the effective radiation area of the flame is reduced, and the intensity characteristic I of the radiation direction at a specific wavelength x Is that
I x ＝I max cos 2 θ x ，
Wherein I is max For the intensity of light radiation in the direction normal to the flame boundary, θ x Is the angle between the direction of the boundary radiation ray and the normal direction.
Specifically, in the embodiment of the present invention, in order to avoid the matching error of the spatial frequency light, it is necessary to further reject the source point light whose light intensity distribution does not conform to the cosine square law based on the calculation of the intensity characteristic of the radiation direction at the specific wavelength. On the basis, three hyperspectral radiation ray intensities at a certain point of the flame boundary obtained in FIG. 3 are selected, wherein the intensity is respectively I i ，I j And I k The included angles between the two directions of the boundary normal are respectively theta i ，θ j And theta k Then there is the following relationship
By solving I max ，θ i ，θ j And theta k Setting the value of θ i ，θ j And theta k The corresponding spatial frequency ray direction vectors are (x) n1 ,y n1 ,z n1 )，(x n2 ,y n2 ,z n2 ) And (x) n3 ,y n3 ,z n3 ) They are aligned with the normal vector (x n ,y n ,z n ) The following relationship is satisfied
By solving, the normal vector (x n ,y n ,z n ) The hyperspectral radiation characteristics of different sight directions of the flame boundary can be calculated based on the spectral radiation characteristics and the directional radiation characteristics in the Planck radiation law.
Specifically, in the embodiment of the present invention, the optical attenuator 1 may be configured in a different structure, so long as the structure capable of avoiding the image saturation caused by the intense radiation of flame and the damage to the electro-optical imaging system described in the present invention is satisfied.
Specifically, in the embodiment of the present invention, the imaging lens 2 is configured as an achromatic lens 21, and the achromatic lens 21 is used as a main component of the light collecting module, so that flame radiation light rays with the same spatial frequency are collected at the same position of the fourier space spectrum plane of the focal plane of the imaging lens, and light ray collection is achieved.
Specifically, in the embodiment of the present invention, the achromatic lens 21 is a lens arrangement for eliminating chromatic aberration and imaging in the present embodiment, and it is within the scope of the present invention as long as the function of the achromatic lens 21 of the present invention is satisfied.
Specifically, in the embodiment of the present invention, the optical filter 3 in the light identifying module is a sparse spatial filter 31 disposed at different positions of the fourier space spectrum plane, the spatial filter 31 can achieve that light with a specific spatial frequency reaches the sensor array, and the band-pass filters 32 can enable sparse spatial frequency information sampled in parallel to be independent in a spectrum domain through filters with different band-pass bands disposed at the positions of the different spatial filters 31 in a combined manner, so that the spatial frequency information can be identified and extracted by wavelength features.
Specifically, in the embodiment of the present invention, the light passing through the achromatic lens 21 passes through the sparse spatial filter 31, passes through the focal length of the image side of the lens, and makes the light with a specific spatial frequency reach the sensor array, and passes through the bandpass filter 32 disposed on the sparse spatial filter 31, so that the sampled sparse spatial frequency information is independent in the spectral domain, and the spatial frequency information is identified and extracted by taking the wavelength as the characteristic point.
Specifically, in the embodiment of the present invention, the time domain spectrum module is composed of a video hyperspectral sensor, and a combination mode of a mask 41 prism 42 structure is adopted to distinguish wavelength information contained in light, and the hyperspectral radiation information of dynamic flame is obtained in the time domain by combining with the video gray-scale camera 5.
Specifically, in the embodiment of the present invention, the time domain spectrum module distinguishes wavelength information contained in light through the light splitting structure 4, and in this embodiment, the light splitting structure 4 adopts a mask 41 prism 42 structure, and the distinguished wavelength information of the light is used to acquire hyperspectral radiation information of the dynamic flame by using the video gray scale camera 5.
Specifically, in the embodiment of the invention, the light is collected and transmitted to the light identification module for identification and extraction through the light collection module, the identified and extracted light is transmitted to the time domain spectrum module, and the time domain spectrum module distinguishes and extracts information of the light transmitted through the light identification module, so that the flame sparse space frequency radiation light and the spectrum information carried by the flame sparse space frequency radiation light can be synchronously acquired in the time domain.
Specifically, in the embodiment of the present invention, the light collecting module performs optical attenuation on the received light through the optical attenuator 1, in this embodiment, the optical attenuator 1 is set as the bilinear polarizer 11, and transmits the light attenuated by the optical attenuator 1 to the imaging lens 2, in this embodiment, the imaging lens 2 is set as the acromatic lens 21, the light processed by the acromatic lens 21 is transmitted to the optical filter 3, in this embodiment, the optical filter 3 is set as the sparse spatial filter 31 at different positions of the fourier space spectrum plane, and combines filters of different band-pass bands at the positions of the different spatial filters 31, the light passes through the sparse spatial filter 31 to allow the light of a specific spatial frequency to reach the sensor array, and under the effect of the filter of the band-pass band, the sparse spatial frequency information sampled in parallel is mutually independent in the spectral domain, the spatial frequency information can be identified and extracted in terms of wavelength characteristics, the light passing through the filter of the band-pass is transmitted to the spectral structure 4, in this embodiment, the spectral structure 4 is set as the prism structure 41, the prism 41 is combined with the filters of different positions of the fourier space spectrum plane, the spatial frequency information is combined with the filters of the spatial frequency spectrum plane of the optical filter 31, and the spectral mask of the spectral mask 4 is used to obtain the high-level dynamic information of the light of the camera, and the grey scale of the camera is differentiated in the grey scale of the video radiation of the video in the spectral mask 5.
Specifically, in the embodiment of the invention, the light collecting module, the light identifying module and the time domain spectrum module can synchronously acquire the flame sparse space frequency radiation light and the spectrum information carried by the flame sparse space frequency radiation light in the time domain through cooperative work.
Specifically, in the embodiment of the present invention, the present invention further provides a sparse spatial frequency light ray identification and extraction method, including:
step one: the light collecting module attenuates the light through the light attenuator 1 and transmits the light attenuated by the light attenuator 1 to the acromatic lens 21;
step two: the light collected by the achromatic lens 21 is transmitted to a light identification module, a sparse spatial filter 31 is arranged at different positions of a Fourier space spectrum surface in the light identification module for identifying and transmitting the light, and filters with different band-pass bands are combined at the positions of the different spatial filters 31 for identifying and extracting the space frequency information according to wavelength characteristics;
step three: the light rays identified and extracted by the light ray identification module are transmitted to the time domain spectrum module, the time domain spectrum module distinguishes the light rays by wavelength information through a mask 41 prism 42 structure, and hyperspectral radiation information of dynamic flames is obtained in the time domain by the video gray-scale camera 5.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
The foregoing description is only of the preferred embodiments of the invention and is not intended to limit the invention; various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a fire environment sparse space frequency light-oriented discernment extraction system which characterized in that includes:
the light collecting module comprises a light attenuator, one end of the light attenuator receives light, the other end of the light attenuator is connected with an imaging lens, the light attenuator is used for avoiding image oversaturation and damage to the system, the imaging lens is used for collecting flame radiation light rays with the same spatial frequency at the same position of an image side focal plane of the imaging lens, and the light collecting module is used for attenuating the light rays through the light attenuator and collecting the flame radiation light rays with the same spatial frequency after being attenuated by the light attenuator at the same position of the image side focal plane through the imaging lens;
a light identification module comprising an optical filter to allow light of a specific spatial frequency to reach the sensor array and to make the parallel sampled sparse spatial frequency information independent of each other in the spectral domain;
the time domain spectrum module comprises a video hyperspectral sensor and is used for distinguishing wavelength information contained in light rays and acquiring hyperspectral radiation information of dynamic flames in a time domain through a video gray-scale camera;
the light is collected and transmitted to the light identification module through the light collection module for identification and extraction, the identified and extracted light is transmitted to the time domain spectrum module, the time domain spectrum module distinguishes and extracts information of the light transmitted by the light identification module, and the flame sparse space frequency radiation light and the spectrum information carried by the flame sparse space frequency radiation light can be synchronously acquired in the time domain.
2. The flame environment sparse spatial frequency light ray-oriented identification extraction system of claim 1, wherein the light attenuator in the light ray collection module is configured as a double-line polarizer configured to avoid image saturation and destruction of the system by intense flame radiation.
3. The flame environment-oriented sparse spatial frequency light ray identification and extraction system of claim 2, wherein the dual-wire polarizer is capable of varying degrees of light attenuation by controlling the angle between the two polarization axes based on the law of mahalanobis.
4. The flame environment sparse spatial frequency light ray-oriented identification extraction system of claim 1, wherein the imaging lens is configured as an achromat.
5. The flame environment-oriented sparse spatial frequency light ray identification and extraction system of claim 1, wherein the optical filter is a sparse spatial filter arranged at different positions of a fourier spatial spectrum plane for identifying light rays.
6. The flame environment-oriented sparse spatial frequency light ray identification and extraction system according to claim 5, wherein filters of different bandpass bands are jointly arranged at different spatial filter positions, so that the sparse spatial frequency information sampled in parallel is independent of each other in a spectral domain and light rays are extracted.
7. The system for recognizing and extracting light rays with sparse spatial frequency for flame environment according to claim 1, wherein the video hyperspectral sensor adopts a mask prism structure for distinguishing wavelength information contained in the light rays.
8. The recognition extraction system of the sparse spatial frequency light rays facing the flame environment according to claim 7, wherein the light rays processed by the mask prism structure in the time domain spectrum module are transmitted to a video gray scale camera, and the video gray scale camera acquires hyperspectral radiation information of dynamic flames in a time domain.
9. The flame environment-oriented sparse spatial frequency light ray identification and extraction system according to claim 1, wherein the light ray collection module, the light ray identification module and the time domain spectrum module can synchronously acquire flame sparse spatial frequency radiation light rays and spectrum information carried by the flame sparse spatial frequency radiation light rays in a time domain through cooperative work.
10. The method for identifying and extracting the sparse space frequency light rays oriented to the flame environment is characterized by comprising the following steps of:
step one: the light collecting module attenuates light through the light attenuator and transmits the light attenuated by the light attenuator to the achromat;
step two: transmitting the light collected by the achromatic lens to a light identification module, wherein sparse spatial filters are arranged at different positions of a Fourier space spectrum surface in the light identification module to identify and transmit the light, and filters with different band-pass bands are combined at different spatial filter positions to identify and extract the space frequency information according to wavelength characteristics;
step three: the light rays which are identified and extracted by the light ray identification module are transmitted to the time domain spectrum module, the time domain spectrum module distinguishes the light rays by wavelength information through the mask prism structure, and hyperspectral radiation information of dynamic flames is obtained in the time domain by the video gray-scale camera.
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