Atlas collaborative detection system and method based on free-form surface

Abstract

The invention relates to a large-view-field compact-structure spectrum collaborative detection system and method based on a free-form surface. The system comprises front optics, a view field diaphragm, relay optics, an imaging detector, a spectrum acquisition module and a spectrum detector, the front optical system is composed of three reflectors and is used for reflecting light of an object view field and converging and imaging, and the converged light forms first incident light; the field diaphragm is a plane mirror with a hole in the middle, a reflecting surface reflects part of light in the first incident light and forms first field light, and the hole part penetrates through the rest of light in the first incident light and forms second field light; the relay optics is used for transmitting first field-of-view light and reducing imaging; the imaging detector is used for receiving the image which is optically reduced by the relay; the spectrum acquisition module is used for splitting the second view field light to form interference; and the spectrum detector is used for receiving the intensity of the interference light output by the spectrum acquisition module. The front optical system folds an optical path through the free-form surface reflector, so that the field of view of the detection system can be widened, and the compactness of the structure of the detection system can be ensured.

Description

Technical Field

[0001] The present invention relates to the field of photoelectric detection technology, and in particular to a free-form surface-based spectrum collaborative detection system and method with a large field of view and compact structure. Background Art

[0002] The traditional photoelectric detection system is based on optical imaging, and the type of the target is identified according to the morphological features of the target imaged on the detector. As the technical indicators of the detection system are further improved, such as having a longer detection and identification distance, the detection system needs to have a larger aperture, which makes the system very large and bulky, and it is difficult to meet the demand for light load minimization. The detection system based on the coordination of optical imaging and spectral recognition is an effective way to achieve longer-distance detection and identification of traditional photoelectric detection systems. The patent with the authorization announcement number CN105182436B discloses a device and method for coordinated detection of moving targets with all-optical band spectra. The patent with the application publication number CN105676305A discloses a common aperture multi-field of view spectra coordinated detection system and method. The patent with the authorization announcement number CN108152863B discloses a spectrum coordinated detection system and search method capable of large field of view search. The patent with the authorization announcement number CN108415097B discloses a spectrum coordinated detection system and method for multi-band infrared imaging. The above patents disclose the method and system for collaborative detection of graphs. They use rotationally symmetrical front optics to collect the instantaneous scene of the object, and then achieve a large field of view by scanning the rotating mechanism. This method and system limits the instantaneous field of view of the detection system and is difficult to meet the application requirements of long-distance multi-target detection and recognition.

[0003] Compared with spherical and aspherical surfaces, free-form surfaces provide more design freedom for optical system design, and therefore have stronger aberration correction capabilities, which are particularly suitable for the design of compact photoelectric detection systems with large fields of view. In recent years, with the continuous development of advanced manufacturing technology, free-form surfaces have many successful applications in the fields of imaging and lighting, and also provide many possibilities for the use of free-form surfaces in the spectrum collaborative detection system. In summary, it is of great significance to apply free-form surfaces to the design and manufacture of spectrum collaborative detection systems. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a free-surface-based spectrum collaborative detection system and method.

[0005] The present invention is implemented as follows: a free-form surface-based spectrum collaborative detection system, the system comprising:

[0006] The front optics is composed of three reflectors, which are used to reflect the light of the object field and converge it to form an image, and the converged light forms the first incident light;

[0007] A field stop, which is a plane reflector with an opening in the middle, wherein the reflective surface reflects part of the first incident light to form a first field light, and the opening portion transmits the rest of the first incident light to form a second field light;

[0008] Relay optics, which is used to transmit the first field of view light and reduce the image;

[0009] An imaging detector, the imaging detector being used to receive the image reduced by relay optics;

[0010] A spectrum acquisition module, the spectrum acquisition module is used to split the second field of view light to form interference;

[0011] A spectrum detector, which is used to receive the intensity of the interference light output by the spectrum acquisition module;

[0012] The front optics consists of a first reflector, a second reflector and a third reflector along the direction of light transmission, and the reflective surfaces of the first reflector and the third reflector are both free-form surfaces; the geometric centers of the first reflector, the second reflector and the third reflector are not coaxial, but the surface centers of their reflective surfaces are coaxial, and the first reflector and the third reflector are close to each other and can be processed on the same substrate.

[0013] Furthermore, the reflection surfaces of the first reflector and the third reflector are both composed of a fifth-order xy polynomial containing an even-order term of x, and the expression equation of the xy polynomial free-form surface is:

[0014]

[0015] Furthermore, the reflecting surface of the second reflector is a 10th-order even-order aspheric surface, and the surface expression equation is:

[0016]

[0017] Furthermore, the working wavelength band of the front optics is 2.5 to 16.0 μm.

[0018] Furthermore, the field diaphragm is composed of a thin metal parallel plate, and the surface of the field diaphragm facing the incident light is coated with a reflective film; the middle of the field diaphragm has an opening, and the shape and size of the hole are set according to the index requirements of the detection system.

[0019] Furthermore, the front optics, field aperture, relay optics and imaging detector constitute an imaging channel, and the operating band of the channel is 7.7-9.5 μm.

[0020] Furthermore, the relay optics is composed of a plurality of positive lenses and negative lenses having different material combinations.

[0021] Furthermore, the surface of the relay optical lens is spherical.

[0022] Furthermore, the spectrum acquisition module is composed of a Michelson interferometer, a collimating reflector and a converging reflector.

[0023] Furthermore, the spectrum acquisition module and the spectrum detector form a spectrum acquisition channel, and the operating band of the channel is 2.5 to 16.0 μm.

[0024] Furthermore, the detection system has a light aperture of 100 mm, wherein the field of view of the imaging channel is 2.75°×2.20°, and the field of view of the spectrum acquisition channel is 0.2°×0.2°.

[0025] The present invention also provides a free-form surface-based spectrum collaborative detection method, comprising the following steps:

[0026] Step 1: light collection, the three-reflector system consisting of a first reflector, a second reflector and a third reflector is used to reflect the object field light through the front optics, and converges it into a first incident light, wherein the reflection surfaces of the first reflector and the third reflector are free-form surfaces, and the first reflector and the third reflector are processed on the same substrate;

[0027] Step 2: Field separation, separating the first incident light by a field aperture, reflecting part of the light to form the first field light, and transmitting part of the light to form the second field light;

[0028] Step 3: Imaging processing, using relay optics to reduce the first field of view light and project it onto the imaging detector;

[0029] Step 4: Spectral spectrometry: Spectral spectrometry and interference processing are performed on the light of the second field of view through the spectrum acquisition module, and the intensity of the interference light is recorded using a spectrum detector.

[0030] Furthermore, in the light collecting step:

[0031] The working band of the front optics is 2.5~16.0μm;

[0032] The surface centers of the first reflector, the second reflector and the third reflector are coaxial, but the geometric centers are not coaxial, so as to reduce the difficulty of optical assembly and adjustment;

[0033] The field diaphragm is a thin metal parallel plate coated with a reflective film, and the shape and size of the middle opening are set according to the requirements of the detection system.

[0034] Further, in the spectral splitting step:

[0035] The spectrum acquisition module consists of a Michelson interferometer, a collimating reflector, and a converging reflector. The Michelson interferometer is used to generate an interference pattern during the spectroscopic process.

[0036] After the second field of view light passes through the spectrum acquisition module, it is recorded as interference light intensity data of a wide spectrum and output to the spectrum detector;

[0037] The working band of the spectrum detector is 2.5~16.0μm, and it is used to receive and record the intensity of interference light.

[0038] Further, the method further comprises the following steps:

[0039] Step 5: Field of view adjustment: by adjusting the opening size and position of the field of view diaphragm, the field of view of the imaging channel and the spectral acquisition channel can be separated. The field of view of the imaging channel is 2.75°×2.20°, and the field of view of the spectral acquisition channel is 0.2°×0.2°.

[0040] Step 6: Data analysis and output: synchronously process the data acquired by the imaging detector and the spectral detector, and combine the image information and spectral information to generate collaborative detection results.

[0041] In combination with the above technical solutions and the technical problems solved, the advantages and positive effects of the technical solutions to be protected by the present invention are as follows:

[0042] Compared with the existing spectrum cooperative detection system based on rotationally symmetric front optics, the spectrum cooperative detection system based on free-form surfaces provided by the present invention can achieve a larger instantaneous field of view and ensure the compactness of the structure, and has obvious advantages in the detection and identification of multiple targets in a large field of view. At the same time, in the front optics of the spectrum cooperative detection system based on free-form surfaces, the positions of the first reflector and the third reflector along the Z-axis direction are very close and approximately continuous, which is very suitable for processing on the same substrate, thereby facilitating the processing and assembly of the detection system.

[0043] The technical solution of the present invention aims to solve the problems of narrow instantaneous field of view and low collaborative detection efficiency in the spectrum collaborative detection system in the prior art. Through innovative free-form surface optical design and light separation method, the detection performance is significantly improved, thereby solving the technical bottleneck that traditional technology is difficult to take into account both large-field-of-view high-resolution detection imaging and high-precision spectral acquisition.

[0044] The present invention realizes efficient separation of light through the innovatively designed field aperture, so that image and spectral information can be acquired synchronously in the same system. In the prior art, independent image detection and spectral detection devices are often used, and the system structure is complex and cannot collaborate in real time. The present invention designs the field aperture as a plane reflector with a hole in the middle. Through the clever separation of reflection and transmission, it not only ensures the utilization rate of light energy, but also realizes the integrated operation of spectrum detection, solving the problem of low efficiency of multi-device collaboration in traditional systems.

[0045] Through the optimization of the above technical solutions, the present invention has brought significant technological progress in industrial applications. The system can complete the simultaneous detection of high-resolution images and high-precision spectra in real time in complex environments, effectively reducing the complexity and cost of equipment, while significantly improving the detection efficiency and accuracy. Its application in remote sensing detection, industrial detection, scientific research and other fields can meet the demand for multifunctional, high-performance spectrum detection systems, and provide advanced technical support for industry development. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 A schematic diagram of the optical path of a free-form surface-based spectrum collaborative detection system provided in an embodiment of the present invention;

[0047] Figure 2 A schematic diagram of the optical path structure and coordinate system of the front optics provided in an embodiment of the present invention;

[0048] Figure 3 A schematic diagram of the structure and optical path of a field stop provided in an embodiment of the present invention;

[0049] Figure 4 A schematic diagram of the structure and optical path of the relay optics provided in an embodiment of the present invention;

[0050] Figure 5 Modulation transfer function (MTF) curves of the imaging channel under different fields of view provided by the embodiment of the present invention;

[0051] Figure 6 A schematic diagram of the structure and optical path of a spectrum acquisition module provided in an embodiment of the present invention;

[0052] In the figure: 01, front optics; 02, field aperture; 03, relay optics; 04, imaging detector; 05, spectrum acquisition module; 06, spectrum detector; 011, object light; 012, first reflector; 013, second reflector; 014, third reflector; 015, first incident light; 021, first field light; 022, second field light; 051, collimating mirror; 052, beam splitter; 053, compensation mirror; 054, stationary mirror; 055, uniformly moving mirror; 056, converging mirror; 057, coherent light. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] like Figure 1 As shown, the present invention provides a free-form surface-based spectrum collaborative detection system, the system comprising:

[0055] Pre-optics 01, which is composed of three reflectors, is used to reflect the light of the object field and converge it to form an image, and the converged light forms a first incident light;

[0056] The field stop 02 is a plane reflector with an opening in the middle, wherein the reflective surface reflects part of the first incident light to form a first field light, and the opening part transmits the rest of the first incident light to form a second field light;

[0057] Relay optics 03, which is used to transmit the first field of view light and reduce the image;

[0058] An imaging detector 04, which is used to receive the image reduced by relay optics;

[0059] A spectrum acquisition module 05, which is used to split the second field of view light to form interference;

[0060] A spectrum detector 06, which is used to receive the intensity of the interference light output by the spectrum acquisition module;

[0061] The front optical system 01 is composed of a first reflector, a second reflector and a third reflector along the direction of light transmission, and the reflective surfaces of the first reflector and the third reflector are both free-form surfaces; the geometric centers of the first reflector, the second reflector and the third reflector are not coaxial, but the surface centers of their reflective surfaces are coaxial, and the first reflector and the third reflector are close to each other and can be processed on the same substrate.

[0062] The free-form surface-based spectrum collaborative detection system provided by the present invention utilizes the collaborative work of front optics, field aperture, relay optics, imaging detector, spectrum acquisition module and spectrum detector to achieve the synchronous acquisition of the image and spectrum information of the target object through light reflection, light splitting and imaging. The system adopts the ingenious design of multiple free-form surface reflectors and field apertures to improve the optical performance and detection field of view, ensuring the efficiency and reliability of multi-functional collaboration.

[0063] First, the object light 011 is reflected by the three reflectors of the front optical system 01 and then converged to form a first incident light 015. Among them, the reflection surfaces of the first reflector 012 and the third reflector 014 are free-form surfaces, which can effectively correct imaging distortion and improve the image quality of the optical system. Although the geometric centers of the first reflector and the third reflector are not coaxial, the surface centers of their reflection surfaces maintain a coaxial design, and the close arrangement enables them to be processed on the same substrate, which optimizes the structural stability and accuracy of the optical assembly.

[0064] Subsequently, the first incident light 015 passes through the field aperture 02 to achieve light separation. The field aperture is a plane reflector with a hole in the middle. Its reflective surface reflects part of the light to form the first field light 021, while the hole allows the remaining light to pass through to form the second field light 022. Through this light separation method, the system can simultaneously extract the image information and spectral information of the target, ensuring the coordinated implementation of multi-task detection.

[0065] Next, the first field of view light 021 is transmitted and reduced to an image by the relay optics 03. The relay optics optimizes the light transmission efficiency and image resolution, and focuses the reflected light with higher precision onto the imaging detector 04. The imaging detector converts the received image information into an electrical signal for subsequent digital processing and analysis.

[0066] The second field of view light 022 is received by the spectrum acquisition module 05 and is subjected to spectroscopic processing. The spectrum acquisition module is composed of a collimating reflector 051, a beam splitter 052, a compensating mirror 053, a stationary reflector 054, a uniformly moving reflector 055, and a converging reflector 056. Inside the module, the second field of view light is collimated by the collimating reflector and then amplitude separated by the beam splitter, and then an interference effect is generated by the compensating mirror and the uniformly moving reflector. The converging reflector converges the coherent light 057 and outputs it, providing a stable spectrum information input for the spectrum detector 06.

[0067] The spectrum detector 06 accurately measures the intensity of the interference light output by the spectrum acquisition module and converts the result into spectrum data. Through the dynamic change of the intensity of the interference light, the spectrum detector can reflect the subtle spectrum characteristics of the light on the object side. By combining the spectrum data with the image information output by the imaging detector, the system can simultaneously obtain the spatial distribution characteristics and spectral components of the object, providing a full range of detection results.

[0068] The present invention realizes the coordinated detection function of image and spectral information through the full process design of precise reflection, separation, transmission and interference of light in space. The free-form surface reflector design of the front optics greatly improves the optical performance, the separation effect of the field aperture ensures the synchronization of image and spectral tasks, and the combination of the spectrum acquisition module and the detector further expands the function and application scope of the detection system.

[0069] The reflection surfaces of the first reflector and the third reflector are both composed of a fifth-order xy polynomial containing an even-order term of x, and the expression equation of the xy polynomial free-form surface is:

[0070]

[0071] The reflecting surface of the second reflector is a 10th-order even-order aspheric surface, and the surface expression equation is:

[0072]

[0073] The working wavelength band of the front optics is 2.5-16.0 μm.

[0074] The field diaphragm 02 is composed of a thin metal parallel plate, and the surface of the field diaphragm facing the incident light is coated with a reflective film; the field diaphragm has a hole in the middle, and the shape and size of the hole are set according to the index requirements of the detection system.

[0075] The front optics 01, the field aperture 02, the relay optics 03 and the imaging detector 04 constitute an imaging channel, and the working band of the channel is 7.7-9.5 μm.

[0076] The relay optics 03 is composed of a plurality of positive lenses and negative lenses having different material combinations.

[0077] The surface shape of the lens of the relay optics 03 is spherical.

[0078] The spectrum acquisition module 05 is composed of a Michelson interferometer, a collimating mirror and a converging mirror.

[0079] The spectrum acquisition module 05 and the spectrum detector 06 form a spectrum acquisition channel, and the operating band of the channel is 2.5-16.0 μm.

[0080] The detection system has a light aperture of 100 mm, wherein the field of view of the imaging channel is 2.75°×2.20°, and the field of view of the spectrum acquisition channel is 0.2°×0.2°.

[0081] The optical path of the free-form surface-based spectrum collaborative detection system when working is as follows: the object light 011 is incident on the front optical system 01, and is successively reflected by the first reflector 012, the second reflector 013 and the third reflector 014 in the front optical system 01, and converges to form an image, and the converged light forms a first incident light 015; the first incident light 015 is incident on the field aperture 02, and the first incident light 015 is reflected by the reflective surface in the field aperture 02 to form a first field light 021, and at the same time, the first incident light 015 passes through the opening in the field aperture 02 to form the first field light 021. Two field-of-view light rays 022; the first field-of-view light 021 is transmitted by the relay optics 03, and is imaged on the image detector 04 after being reduced; the second field-of-view light 022 enters the spectrum acquisition module 05, and is reflected by the collimating reflector 051 in the spectrum acquisition module 05, and the reflected light enters the interferometer composed of a beam splitter 052, a compensation mirror 053, a stationary reflector 054, and a uniformly moving reflector 055, and outputs coherent light 057; the coherent light 057 is reflected by the converging reflector 056 in the spectrum acquisition module 05, and converges into the spectrum detector 06. The first reflector 012 and the third reflector 014 in the front optics 01 are both free-form surface reflectors, and the reflected light paths in the first reflector 012, the second reflector 013 and the third reflector 014 overlap with each other, thereby making full use of the space, so that the structure of the free-form surface-based spectrum collaborative detection system is compact, and light with a larger field of view can be received by the imaging detector 04; the first reflector 012 and the third reflector 014 are very close and approximately continuous in position along the Z-axis direction, and can be processed on the same substrate.

[0082] like Figure 2 The figure shows the optical path structure and surface coordinate system of the front optical system 01 of the free-form surface-based spectrum collaborative detection system. The first three-dimensional rectangular coordinate system (x1, y1, z1) is defined in space. The horizontal z1 axis is negative to the left and positive to the right. The y1 axis is Figure 2In the plane shown, the value perpendicular to the z1 axis is positive upward and negative downward, the x1 axis is perpendicular to the y1z1 plane, and the value perpendicular to the y1z1 plane is positive inward and negative outward. In space, relative to the first three-dimensional rectangular coordinate system (x1, y1, z1), the space where the first reflector 012 is located defines the second three-dimensional rectangular coordinate system (x2, y2, z2), the space where the second reflector 013 is located defines the third three-dimensional rectangular coordinate system (x3, y3, z3), and the space where the third reflector 014 is located defines the fourth three-dimensional rectangular coordinate system (x4, y4, z4). The free-form surface of the first reflector 012 is expressed in the second three-dimensional rectangular coordinate system (x2, y2, z2), the even-order aspheric surface of the second reflector 013 is expressed in the third three-dimensional rectangular coordinate system (x3, y3, z3), and the free-form surface of the third reflector 014 is expressed in the fourth three-dimensional rectangular coordinate system (x4, y4, z4).

[0083] The origin of the second three-dimensional rectangular coordinate system (x2, y2, z2) is at the position (0, -100mm, 206.55mm) of the first three-dimensional direct coordinate system (x1, y1, z1), and the positive direction of the z2 axis is parallel to the positive direction of the z1 axis of the first three-dimensional rectangular coordinate system (x1, y1, z1).

[0084] The origin of the third three-dimensional rectangular coordinate system (x3, y3, z3) is at the position (0, -100mm, 8.63mm) of the first three-dimensional rectangular coordinate system (x1, y1, z1), and the positive direction of the z3 axis is rotated 4.56° counterclockwise relative to the positive direction of the z1 axis of the first three-dimensional rectangular coordinate system (x1, y1, z1).

[0085] The origin of the fourth three-dimensional rectangular coordinate system (x4, y4, z4) and the origin of the second three-dimensional rectangular coordinate system (x2, y2, z2) are at the same position, and the positive direction of the z4 axis is parallel to the positive direction of the z2 axis of the second three-dimensional rectangular coordinate system (x2, y2, z2).

[0086] The first reflector 012 and the third reflector 014 of the system are respectively fifth-order xy polynomials in the second three-dimensional rectangular coordinate system (x2, y2, z2) and the fourth three-dimensional rectangular coordinate system (x4, y4, z4), and their general expressions are:

[0087]

[0088] Wherein, z is the vector height represented by the length unit mm, and Ci is the coefficient of the i-th term in the polynomial. Since the front optics 01 in the free-form surface-based spectrum collaborative detection system is symmetrical about the yz plane, the even terms of x are retained. In this embodiment, the values ​​of the coefficients Ci in the free-form surface xy polynomial of the first reflector 012 and the third reflector 014 are respectively referred to in Table 1. It can be understood that the values ​​of the coefficients Ci are not limited to those described in Table 1, and those skilled in the art can adjust them according to actual needs.

[0089] Table 1 Values ​​of coefficients of the free-form surface xy polynomials of the first reflecting mirror 012 and the third reflecting mirror 014.

[0090]

[0091]

[0092] The second reflector 013 in the front optical system 01 is a 10th-order even-order aspheric surface in the third three-dimensional rectangular coordinate system (x3, y3, z3), and its general expression is:

[0093]

[0094] Among them, z is the vector height represented by the length unit mm, c is the curvature of the base surface of the even-order aspheric surface, k is the quadratic surface coefficient of the base surface of the even-order aspheric surface, and A, B, C, and D are the coefficients of the higher-order terms of the even-order aspheric surface. In this embodiment, the values ​​of the coefficients of the even-order aspheric surface of the second reflector 013 in the front optical system 01 are respectively referred to in Table 2. It can be understood that the values ​​of the coefficients c, k, A, B, C, and D are not limited to those described in Table 2, and those skilled in the art can adjust them according to actual needs.

[0095] Table 2 Values ​​of the even-order aspheric coefficients of the second reflecting mirror 013.

[0096] Coefficient name Second reflector 013 c -154.57 k 0.92 A -0.00001 B 0.00000 C 0.00000 D 0.00000

[0097] like Figure 3 FIG. 1 is a schematic diagram of the structure and optical path of a field of view stop 02 of a free-form surface-based spectrum collaborative detection system. The field of view stop 02 is a parallel flat plate, and a reflective film is coated on the parallel surface facing the first incident light 015, which reflects part of the first incident light 015 to form the first field of view light 021. The central part of the field of view stop 02 has an opening, such as Figure 3 As shown by the circle in , the opening transmits part of the first incident light 015 to form the second field light 022. In this embodiment, the material of the field aperture 02 is metal or compound.

[0098] like Figure 4As shown, it is a schematic diagram of the structure and optical path of the relay optics 03 provided in an embodiment of the present invention. The vertical axis magnification of the relay optics 03 is -0.667. The relay optics 03 is composed of 5 glass lenses, and the glass materials are AMTIR1, GERM, ZNS, GERM, and AMTIR1 from left to right. It can be understood that the order of the 5 glass lenses in the relay optics 03 is not limited to the above, and those skilled in the art can adjust it according to actual needs.

[0099] like Figure 5 As shown in the figure, the MTF curves of the imaging channel composed of the front optics 01, the field aperture 02, the relay optics 03 and the imaging detector 04 under different fields of view. It can be seen from the figure that the MTF curve of each field of view is not less than 0.2, indicating that the imaging channel in the free-form surface-based spectrum collaborative detection system has a very high imaging quality, which is conducive to the detection of long-distance multi-targets.

[0100] like Figure 6 As shown, the structure and optical path schematic diagram of the spectrum acquisition module 05. In the spectrum acquisition module 05, a Michelson interferometer is composed of a beam splitter 052, a compensation mirror 053, a stationary reflector 054, and a uniformly moving reflector 055. The interferometer divides the second field of view light 022 into two coherent lights 057 through the beam splitter 052, and the two coherent lights are converged by the converging reflector 056. In this embodiment, the collimating reflector 051 is an off-axis parabolic reflector with a focal length of 90 mm, made of metal, and the converging reflector 056 is also an off-axis parabolic reflector with a focal length of 90 mm; the beam splitter 052 is a parallel plate made of glass, and a reflective film is coated on the side of the parallel plate facing the second field of view light 022, and the compensation mirror 053 is a parallel plate of the same material and size; the stationary reflector 054 and the uniformly moving reflector 055 are both corner reflectors, made of metal. It is understandable that the material and focal length of the collimating reflector 051, the material and shape of the stationary reflector 054 and the uniformly moving reflector 055 are not limited to those described above, and those skilled in the art may adjust them according to the function and spatial layout requirements of the spectrum acquisition module.

[0101] The spectrum acquisition channel of the free-form surface-based spectrum cooperative detection system operates at 2.5 to 16.0 μm.

[0102] The imaging detector 04 of the free-form surface-based atlas collaborative detection system is an infrared detector with a pixel scale of 640×512 and a pixel size of 15μm×15μm.

[0103] The spectrum detector 06 of the free-form surface-based spectrum collaborative detection system is a single-pixel infrared detector.

[0104] The free-form surface-based spectrum collaborative detection system provided by the embodiment of the present invention has the following advantages: Compared with the existing spectrum collaborative detection system based on rotationally symmetric front optics, the free-form surface-based spectrum collaborative detection system provided by the present invention can obtain a larger field of view, so that a larger range of object scenes can be detected and identified by the system, while ensuring the compactness of the system structure. The first reflector and the third reflector are very close and approximately continuous in position along the Z-axis direction, which is very suitable for processing on the same substrate, thereby facilitating the processing and adjustment of the front optics.

[0105] It should be noted that the embodiments of the present invention can be implemented by hardware, software, or a combination of software and hardware. The hardware part can be implemented using dedicated logic; the software part can be stored in a memory and executed by an appropriate instruction execution system, such as a microprocessor or dedicated design hardware. It can be understood by a person of ordinary skill in the art that the above-mentioned devices and methods can be implemented using computer executable instructions and / or contained in a processor control code, such as a carrier medium such as a disk, CD or DVD-ROM, a programmable memory such as a read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. Such code is provided on the carrier medium. The device and its modules of the present invention can be implemented by hardware circuits such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, etc., or programmable hardware devices such as field programmable gate arrays, programmable logic devices, etc., can also be implemented by software executed by various types of processors, and can also be implemented by a combination of the above-mentioned hardware circuits and software, such as firmware.

[0106] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with the technical field within the technical scope disclosed by the present invention and within the spirit and principle of the present invention should be covered by the protection scope of the present invention.

Claims

1. A free-form surface-based collaborative detection system, characterized in that: The system includes: The front optics is composed of a first reflector, a second reflector and a third reflector along the light transmission direction, wherein the reflective surfaces of the first reflector and the third reflector are free-form surfaces, the geometric centers of the first reflector, the second reflector and the third reflector are not coaxial, but the surface centers of their reflective surfaces are coaxial, the first reflector and the third reflector are close to each other and processed on the same substrate, and are used to reflect the light of the object field and converge the light to form an image, and the converged light forms the first incident light; The field stop is a plane reflector with an opening in the middle, wherein the reflective surface reflects part of the first incident light to form the first field light, and the opening part transmits the rest of the first incident light to form the second field light; Relay optics, used for transmitting the light of the first field of view and reducing it to form an image; An imaging detector for receiving the image reduced by relay optics; A spectrum acquisition module, used for splitting the light of the second field of view to form interference; The spectrum detector is used to receive the intensity of the interference light output by the spectrum acquisition module.

2. The free-form surface-based spectrum collaborative detection system according to claim 1, characterized in that: The working wavelength band of the front optics is 2.5 to 16.0 μm; The field diaphragm is composed of a thin metal parallel plate, and the surface thereof facing the incident light is coated with a reflective film; the shape and size of the middle opening of the field diaphragm are set according to the index requirements of the detection system.

3. The free-form surface-based spectrum collaborative detection system according to claim 1, characterized in that: The relay optics is composed of a plurality of positive lenses and negative lenses, which are made of different materials and have spherical surfaces. The relay optics, the front optics and the imaging detector together form an imaging channel, and the working band of the imaging channel is 7.7-9.5 μm.

4. The free-form surface-based spectrum collaborative detection system according to claim 1, characterized in that: The spectrum acquisition module is composed of a Michelson interferometer, a collimating reflector and a converging reflector; The spectrum acquisition module and the spectrum detector together constitute a spectrum acquisition channel, and the operating band of the channel is 2.5 to 16.0 μm; The detection system has a light aperture of 100 mm, wherein the field of view of the imaging channel is 2.75°×2.20°, and the field of view of the spectrum acquisition channel is 0.2°×0.2°.

5. The free-form surface-based spectrum collaborative detection system according to claim 1, characterized in that: The reflection surfaces of the first reflector and the third reflector are both composed of a fifth-order xy polynomial containing an even-order term of x, and the expression equation of the xy polynomial free-form surface is:

6. The free-form surface-based spectrum collaborative detection system according to claim 1, characterized in that: The reflecting surface of the second reflector is a 10th-order even-order aspheric surface, and the surface expression equation is:

7. A free-form surface-based collaborative detection method, characterized in that: The following steps are involved: Step 1: light collection, the three-reflector system consisting of a first reflector, a second reflector and a third reflector is used to reflect the object field light through the front optics, and converges it into a first incident light, wherein the reflection surfaces of the first reflector and the third reflector are free-form surfaces, and the first reflector and the third reflector are processed on the same substrate; Step 2: Field separation, separating the first incident light by a field aperture, reflecting part of the light to form the first field light, and transmitting part of the light to form the second field light; Step 3: Imaging processing, using relay optics to reduce the first field of view light and project it onto the imaging detector; Step 4: Spectral spectrometry: Spectral spectrometry and interference processing are performed on the light of the second field of view through the spectrum acquisition module, and the intensity of the interference light is recorded using a spectrum detector.

8. The free-form surface-based spectrum collaborative detection method according to claim 7, characterized in that: In the light collecting step: The working band of the front optics is 2.5~16.0μm; The surface centers of the first reflector, the second reflector and the third reflector are coaxial, but the geometric centers are not coaxial, so as to reduce the difficulty of optical assembly and adjustment; The field diaphragm is a thin metal parallel plate coated with a reflective film, and the shape and size of the middle opening are set according to the requirements of the detection system.

9. The free-form surface-based spectrum collaborative detection method according to claim 7, characterized in that: In the spectral splitting step: The spectrum acquisition module consists of a Michelson interferometer, a collimating reflector, and a converging reflector. The Michelson interferometer is used to generate an interference pattern during the spectroscopic process. After the second field of view light passes through the spectrum acquisition module, it is recorded as interference light intensity data of a wide spectrum and output to the spectrum detector; The working band of the spectrum detector is 2.5~16.0μm, and it is used to receive and record the intensity of interference light.

10. The free-form surface-based spectrum collaborative detection method according to claim 7, characterized in that: The following steps are also included: Step 5: Field of view adjustment: by adjusting the opening size and position of the field of view diaphragm, the field of view of the imaging channel and the spectral acquisition channel can be separated. The field of view of the imaging channel is 2.75°×2.20°, and the field of view of the spectral acquisition channel is 0.2°×0.2°. Step 6: Data analysis and output: synchronously process the data acquired by the imaging detector and the spectral detector, and combine the image information and spectral information to generate collaborative detection results.

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