Concentric glued curved surface prism light splitting type hyperspectral imaging system and method

Abstract

The invention relates to a concentric glued curved surface prism light splitting type hyperspectral imaging system and method, and the method comprises the steps: receiving light rays through a plano-convex lens, and converging a light beam with a specified aperture in the light rays to obtain a converged light beam; the meniscus lens receives and diverges the convergent beam to obtain a divergent beam; the first curved-surface prism and the second curved-surface prism receive the divergent light beams and respectively generate two monochromatic convergent light rays; two monochromatic convergent light rays are reflected on the surface, far away from the first curved surface prism, of the second curved surface prism, sequentially enter the second curved surface prism, the first curved surface prism, the meniscus lens and the plano-convex lens, and finally converge to an image plane; wherein the convex spherical surface of the plano-convex lens and the inner concave surface of the meniscus lens are mutually glued; the surface, close to the second curved-surface prism, of the first curved-surface prism and the surface, close to the first curved-surface prism, of the second curved-surface prism are mutually glued. And the vertex angles of the two curved prisms are oppositely arranged. The device is simple and compact in structure and convenient to install, adjust and calibrate, and meanwhile light weight is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of spectral imaging, and in particular to a concentric glued curved prism light splitting type hyperspectral imaging system and method. Background Art

[0002] Hyperspectral imaging technology cleverly combines the intuitiveness of optical imaging with the sophistication of spectral analysis. It can not only simultaneously capture the two-dimensional spatial distribution image of the target object, but also deeply analyze the one-dimensional spectral details contained in each pixel, thereby constructing a three-dimensional data cube containing rich information. This innovative technology provides unprecedented insight and accuracy for many cutting-edge fields such as deep space exploration, aerospace remote sensing, environmental monitoring and precision agriculture through the analysis and processing of spectral information.

[0003] As the core of hyperspectral imaging technology, spectroscopic technology directly shapes the basic performance characteristics of its imaging spectrometer. Among many designs, spectroscopic elements with gratings and prisms as the core occupy a dominant position. Although the traditional Offner spectrometer exhibits excellent imaging performance with convex gratings, its high manufacturing cost, complex process difficulty, inefficient use of light energy caused by multi-level diffraction, and the accompanying problems of stray light, spectral stacking and ghost images limit its wide application. In contrast, the prism spectroscopic imaging spectrometer stands out with its advantages of no spectral stacking, wide spectral range and high light flux. With the rapid development of precision optical processing and manufacturing technology, high-precision processing of complex curved prisms and their optical element surfaces has been achieved, which has brought new breakthroughs in spectral imaging technology. Compared with the traditional plane prism system, the dispersive spectral imaging system based on curved prisms can not only be flexibly applied in non-parallel optical paths, but also has compact structure, small dispersion nonlinearity, low spectral distortion, high resolution and excellent aberration correction ability, which effectively reduces the spectral line bending phenomenon and significantly improves the imaging quality and comprehensive performance of the system. Among them, the innovative application of glued curved prisms cleverly combines dispersion and imaging functions, and through the exquisite combination with the Dyson relay structure, it greatly simplifies the complexity of the hyperspectral imaging optical system and promotes the spectrometer system to move towards a more efficient, more compact and higher performance direction.

[0004] In the prior art, a Chinese patent (CN109781257A) discloses a free-form surface prism spectrometer optical system using an off-axis three-mirror structure. The system does not have a common optical path characteristic, which leads to the lack of a clear optical axis as a unified reference benchmark during the assembly and debugging stages. In addition, a large number of complex curved prisms are integrated inside the system, which not only increases the number of components, but also greatly increases the difficulty of installation and calibration, making the entire process complicated and cumbersome. The document "Analytical design of a cemented-curved-prism based integral fieldspectrometer (CIFS) with high numerical aperture and high resolution" (Opt. Express 30, 48075-48090, 2022) discloses an integral field-of-view imaging spectrometer based on cemented curved prism spectroscopy. Although the use of hemispherical lenses achieves high numerical aperture and high spatial resolution imaging effects, and the introduction of cemented curved prisms effectively avoids the generation of complex aberrations while improving spectral resolution, the use of a six-piece structure and reliance on spherical reflectors for optical path turning increases the complexity of the system structure. In addition, two meniscus lenses are required for aberration correction, which fails to achieve compactness and lightweight of the system structure. Summary of the invention

[0005] To this end, the technical problem to be solved by the present invention is to overcome the problems in the prior art such as the large number of components, difficult installation and calibration, complex and non-compact structure, and failure to achieve lightweight, and propose a concentric glued curved prism spectroscopic hyperspectral imaging system and method.

[0006] In the first aspect, in order to solve the above technical problems, the present invention provides a concentric glued curved prism spectroscopic hyperspectral imaging system, comprising: A plano-convex lens is used to receive the emitted light and converge a light beam of a specified aperture in the light beam to obtain a convergent light beam; A meniscus lens, used for receiving and diverging the convergent light beam to obtain a divergent light beam; A first curved prism, used for receiving the divergent light beam and generating a first monochromatic converging light beam; A second curved prism, used for receiving the divergent light beam and generating a second monochromatic converging light beam; The first monochromatic converging light and the second monochromatic converging light are reflected at the surface of the second curved prism away from the first curved prism, and are incident on the second curved prism, the first curved prism, the meniscus lens and the plano-convex lens in sequence, and finally converge to the image plane; The convex spherical surface of the plano-convex lens and the concave surface of the meniscus lens are glued to each other; the surface of the first curved prism close to the second curved prism and the surface of the second curved prism close to the first curved prism are glued to each other; the vertex angle of the first curved prism and the vertex angle of the second curved prism are placed oppositely.

[0007] In one embodiment of the present invention, the inner concave surfaces of the meniscus lens, the first curved prism, and the second curved prism are all opposite to the incident direction of the light.

[0008] In one embodiment of the present invention, the glass materials of the first curved prism and the second curved prism are different, the refractive indexes of the first curved prism and the second curved prism are n4 and n5 respectively, and the value ranges satisfy 1.65≤n4≤1.75 and 1.65≤n5≤1.75; the Abbe numbers of the first curved prism and the second curved prism are v4 and v5 respectively, and the value ranges satisfy 32≤v4≤36 and 34≤v5≤38.

[0009] In one embodiment of the present invention, the object-side numerical aperture of the imaging system is NA, and the value range satisfies 0.10≤NA≤0.14; the tube length of the imaging system is L, and the value range satisfies 260mm≤L≤290mm.

[0010] In one embodiment of the present invention, the aperture stop of the imaging system is arranged on a surface of the second curved prism away from the first curved prism.

[0011] In one embodiment of the present invention, the imaging system comprises an object plane, and the object plane and the image plane are located on the same side in space.

[0012] In one embodiment of the present invention, the surface shapes of the plano-convex lens, the meniscus lens, the first curved prism and the second curved prism are all standard spherical surfaces.

[0013] In a second aspect, in order to solve the above technical problems, the present invention provides a concentric glued curved prism spectroscopic hyperspectral imaging method, comprising: The complex light is emitted to a plano-convex lens, and the plano-convex lens is used to converge a light beam of a specified aperture in the complex light and correct aberration to obtain a convergent light beam; The converging light beam is incident on a meniscus lens glued to the plano-convex lens, and the converging light beam is diverged by the meniscus lens to obtain a diverging light beam; The divergent light beam is incident on a first curved prism and a second curved prism glued to the first curved prism in sequence, and optical path compensation is performed through the oppositely placed vertex angles of the first curved prism and the second curved prism to generate a first monochromatic converging light beam and a second monochromatic converging light beam respectively; The first monochromatic converging light and the second monochromatic converging light are reflected at the surface of the second curved prism away from the first curved prism, and are incident on the second curved prism, the first curved prism, the meniscus lens and the plano-convex lens in sequence, and finally converge to the image plane.

[0014] In a third aspect, in order to solve the above-mentioned technical problem, the present invention provides a spectrometer, including the above-mentioned concentric glued curved prism spectroscopic hyperspectral imaging system.

[0015] In a fourth aspect, in order to solve the above-mentioned technical problem, the present invention provides a remote sensing platform, including the above-mentioned spectrometer.

[0016] The above technical solution of the present invention has the following beneficial effects compared with the prior art: The concentrically glued curved prism light splitting type hyperspectral imaging system and method described in the present invention adopts the surface of the first curved prism close to the second curved prism and the surface of the second curved prism close to the first curved prism to be glued to each other, and the two curved prisms are placed at opposite angles, so that the light can pass through the plano-convex lens, the meniscus lens, the first curved prism and the second curved prism twice, and has the characteristics of a common optical path structure, which improves the aberration correction and dispersion capabilities. Among them, the reverse configuration of the curved prism vertex angle realizes the natural compensation of the optical path, and the reflection design of the second curved prism away from the surface of the first curved prism not only meets the aberration elimination condition of the paraxial optical path, but also efficiently compensates for the aberrations related to the aperture and the field of view, and realizes the effective light splitting of the light beam. This design realizes the high energy utilization rate and light collection ability of the imaging system, and the common optical path design further improves the system's light splitting ability and structural compactness. The present invention adopts a 4-piece structure, and the curved prisms are glued to each other, so that the system is easy to assemble and calibrate, the structure is simple, and the system is lightweight.

[0017] The present invention can effectively improve the system's splitting ability and light energy utilization rate by reasonably selecting the glass materials of the two curved prisms, balance the astigmatism introduced by the loss of symmetry of the curved prism in the meridian direction, effectively improve spectral distortion, and facilitate subsequent spectral calibration and image processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0019] Figure 1 It is a structural schematic diagram of a concentric glued curved prism spectroscopic hyperspectral imaging system in a preferred embodiment of the present invention; Figure 2 A ray tracing point diagram of a concentric glued curved prism spectroscopic hyperspectral imaging system in a preferred embodiment of the present invention; Figure 3 A modulation transfer function curve diagram of a concentric glued curved prism spectroscopic hyperspectral imaging system in a preferred embodiment of the present invention; Figure 4 A spectral distortion curve diagram of a concentric glued curved prism spectroscopic hyperspectral imaging system in a preferred embodiment of the present invention; Figure 5 It is a cross-sectional diagram of the point spread function of a concentric glued curved prism spectroscopic hyperspectral imaging system in a preferred embodiment of the present invention.

[0020] Explanation of the reference numerals in the accompanying drawings in the specification: 1. object plane; 2. plano-convex lens; 3. meniscus lens; 4. first curved prism; 5. second curved prism; 6. image plane. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0022] Embodiment 1

[0023] Reference Figure 1 As shown, a concentric glued curved prism spectroscopic hyperspectral imaging system provided by an embodiment of the present invention comprises: The plano-convex lens 2 is used to receive the emitted light and converge the light beam of a specified aperture in the light to obtain a converged light beam; wherein the light beam of the specified aperture is a light beam with a larger aperture.

[0024] A meniscus lens 3 is used to receive and diverge the convergent light beam to obtain a divergent light beam; A first curved prism 4, used for receiving the divergent light beam and generating a first monochromatic converging light beam; A second curved prism 5 is used to receive the divergent light beam and generate a second monochromatic converging light beam; The first monochromatic converging light and the second monochromatic converging light are reflected at the surface of the second curved prism 5 away from the first curved prism 4, and are incident on the second curved prism 5, the first curved prism 4, the meniscus lens 3 and the plano-convex lens 2 in sequence, and finally converge to the image plane 6; Among them, the convex surface of the plano-convex lens 2 and the concave surface of the meniscus lens 3 are glued to each other; the surface of the first curved prism 4 close to the second curved prism 5 and the surface of the second curved prism 5 close to the first curved prism 4 are glued to each other; the vertex angle of the first curved prism 4 and the vertex angle of the second curved prism 5 are placed oppositely.

[0025] Furthermore, the surface of the first curved prism 4 close to the second curved prism 5 is specifically the surface where the divergent light beam first emits from the first curved prism 4 , and the surface of the second curved prism 5 close to the first curved prism 4 is specifically the surface where the divergent light beam first enters the second curved prism 5 .

[0026] The embodiment of the present invention provides a concentrically glued curved prism spectroscopic hyperspectral imaging system, which uses the surface of the first curved prism 4 close to the second curved prism 5 and the surface of the second curved prism 5 close to the first curved prism 4 to be glued to each other, and the two curved prisms are placed at opposite angles, so that light can pass through the plano-convex lens 2, the meniscus lens 3, the first curved prism 4 and the second curved prism 5 twice, and has the characteristics of a common optical path structure, which improves the aberration correction and dispersion capabilities. Among them, the two curved prisms are placed at opposite angles to achieve a compensated optical path. The surface of the second curved prism 5 away from the first curved prism 4 is used as the reflecting surface of the overall structure, which cleverly meets the paraxial optical path aberration elimination condition, effectively compensates for the aberrations related to the aperture and the field of view, and realizes beam splitting at the same time. This design realizes high energy utilization and light collection capability of the imaging system, and the common optical path design further improves the system's light splitting capability and structural compactness. In addition, the embodiment of the present invention adopts a four-piece structure, and the curved prisms are glued to each other, so that the system installation and calibration are easy, the structure is simple, and the system is lightweight.

[0027] To further illustrate the compactness and lightweight of the imaging system provided in an embodiment of the present invention, a comparison is made with the imaging system provided in the prior art (“Analytical design of a cemented-curved-prism based integral fieldspectrometer (CIFS) with high numerical aperture and high resolution” (Opt. Express 30, 48075-48090, 2022)). The imaging system provided in the prior art adopts a 6-piece structure, and its volume is 9.053 times that of the imaging system provided in this embodiment. At the same time, two meniscus lenses 3 are required for aberration correction, and the compactness and lightweight of the system are not achieved.

[0028] Specifically, the optical elements included in the imaging system provided by the embodiment of the present invention are arranged in a coaxial approximately concentric structure and have the characteristics of concentric folding and common optical path. According to the incident direction of the light, the order of the optical elements is: plano-convex lens 2, meniscus lens 3, first curved prism 4 and second curved prism 5. Among them, the convex spherical surface of the plano-convex lens 2 and the concave surface of the meniscus lens 3 are glued to each other; the concave surfaces of the meniscus lens 3, the first curved prism 4 and the second curved prism 5 are opposite to the incident direction of the light; the aperture stop of the imaging system is arranged on the surface of the second curved prism 5 away from the first curved prism 4. In addition, the imaging system includes an object plane 1, and the light is emitted from the object plane 1. The object plane 1 and the image plane 6 are preferably located on the same side in space.

[0029] The embodiment of the present invention combines the compactness of the concentric structure with the high performance characteristics of the glued curved prism to realize a spectral imaging system that can achieve the dual advantages of wide-line field of view and high signal-to-noise ratio. In addition, the surfaces of some optical elements are kept approximately concentrically arranged to achieve the condition of eliminating the spherical aberration of the paraxial optical path, and effectively correct aperture-related aberrations. Since the entire surface of the system's optical elements are designed as standard spherical surfaces, the difficulty and cost of lens processing can be reduced, the system structure is compact, and it is easy to assemble and calibrate, and has practical application value. Therefore, the entire surface of the optical element is designed as a standard spherical surface.

[0030] Specifically, the surface of the optical element is a standard spherical surface. According to the incident direction of the light, the curvature radius of the plano-convex lens 2, the meniscus lens 3, the first curved prism 4 and the second curved prism 5 are R 21 , R 22 , R 32 , R 41 , R 42 , R 52 Specifically, refer to Figure 1 , R 21 R is the radius of curvature of the light when it first passes through the second surface of the plano-convex lens; 22 is the radius of curvature of the light exiting the plane-convex lens 2 (i.e. the convex spherical surface of the plane-convex lens 2); R 32 R is the radius of curvature of the surface of the meniscus lens 3 when the light first passes through it (i.e., the concave surface of the meniscus lens 3); 41 R is the radius of curvature of the four surfaces of the first curved prism when the light first passes through it; 42 R is the radius of curvature of the light on the four surfaces of the first curved prism; 52 is the curvature radius of the light on the reflection surface of the second curved prism 5. In this embodiment, the value range of each curvature radius preferably satisfies: R 21 =Infinity, -38.3≤R 22 ≤-37.8、-63≤R 32 ≤-62.6、-214.6≤R41 ≤-213.5、-164≤R 42 ≤-158, -300.3≤R 52 ≤-299.6. Among them, R 21 =Infinity means that the radius of curvature of the light on the two surfaces of the plano-convex lens when it passes through it for the first time is infinite. The specific values ​​of each radius of curvature can be flexibly selected from any appropriate value within this range according to the specific needs of the actual application scenario. For example, R 22 The options are -38.3, -38, -37.8, etc.; R 32 The options are -63, -62.9, -62.6, etc.; R 41 The options are -214.6, -214, -213.5, etc.; R 42 The options are -164, -163.5, -158, etc.; R 52 The options are -300.3, -300, -299.6, etc.

[0031] Specifically, the glass materials of the first curved prism 4 and the second curved prism 5 are different, and the specific application scenarios and requirements of the curved prisms, such as wavelength range, transmittance, mechanical strength, etc., can be clarified, and then the glass material that meets these requirements can be selected. The refractive indices of the first curved prism 4 and the second curved prism 5 are respectively expressed as n4 and n5. In this embodiment, the preferred refractive index value range satisfies 1.65≤n4≤1.75 and 1.65≤n5≤1.75. The specific values ​​of each refractive index can be flexibly selected from any suitable value within this value range according to the specific needs of the actual application scenario. For example, n4 can be selected as 1.65, 1.7, 1.75, etc.; n5 can be selected as 1.65, 1.7, 1.75, etc. The Abbe numbers of the first curved prism 4 and the second curved prism 5 are v4 and v5, respectively. In this embodiment, the preferred Abbe number value range satisfies 32≤v4≤36 and 34≤v5≤38. The specific values ​​of each Abbe number can be flexibly selected from any appropriate value within this range according to the specific needs of the actual application scenario. For example, v4 can be selected as 32, 35, 36, etc.; v5 can be selected as 34, 36, 38, etc.

[0032] The embodiment of the present invention can effectively improve the system's splitting ability and light energy utilization rate by reasonably selecting the glass materials of the two curved prisms, balance the astigmatism introduced by the loss of symmetry of the curved prism in the meridian direction, effectively improve spectral distortion, and facilitate subsequent spectral calibration and image processing.

[0033] Specifically, the object side numerical aperture of the imaging system provided in this embodiment is NA. In this embodiment, the object side numerical aperture preferably satisfies the range of 0.10≤NA≤0.14. The specific value of NA can be flexibly selected from any suitable value within this value range according to the specific needs of the actual application scenario. For example, NA can be selected as 0.10, 0.12, 0.14, etc. The barrel length of the imaging system is L. In this embodiment, the barrel length preferably satisfies the range of 260mm≤L≤290mm. The specific value of the barrel length L can be flexibly selected from any suitable value within this value range according to the specific needs of the actual application scenario. For example, the barrel length L can be selected as 260mm, 270 mm, 290mm, etc.

[0034] Exemplarily, the object-side numerical aperture NA is preferably 0.12, the object-side linear field of view is 12 mm, the system operating band is 1-2.5 μm, and the system spectral resolution is better than 10 nm at 1000 nm, 1500 nm, 2000 nm and 2500 nm.

[0035] Exemplarily, the parameter values ​​corresponding to the optical elements: plano-convex lens 2, meniscus lens 3, first curved prism 4 and second curved prism 5 are shown in Table 1, and the parameters include radius of curvature, thickness, air gap, refractive index and Abbe number.

[0036] Table 1 Parameters of optical components

[0037] Further, based on the preferred parameter values ​​of each optical element in Table 1, a ray tracing point diagram of the light passing through the imaging system provided by this embodiment can be obtained, which can be referred to Figure 2 .from Figure 2 It was found that the root mean square radius of the spot diagram of each field of view corresponding to the five wavelengths of (a) 1000nm, (b) 1375nm, (c) 1750nm, (d) 2125nm and (e) 2500nm is less than 9.1μm, and the geometric radius of the spot diagram is less than 27.3μm, indicating that the imaging system provided in this embodiment has good imaging quality.

[0038] Further, based on the preferred parameter values ​​of each optical element in Table 1, the modulation transfer function (MTF) curve on the image plane 6 corresponding to each field of view of the imaging system provided in this embodiment can be obtained, which can be referred to Figure 3 .from Figure 3 It can be seen that at the cutoff frequency of 40lp / mm, the MTF values ​​of each field of view at wavelengths of (a) 1000nm, (b) 1750nm and (c) 2500nm are all greater than 0.41, close to the diffraction limit, and the curves are relatively smooth, indicating that the imaging system lens provided in this embodiment has clear and uniform imaging, and the system has good imaging quality in the full band and full field of view.

[0039] Further, based on the preferred parameter values ​​of each optical element in Table 1, the spectral bending and color distortion curves at each imaging field of view of the imaging system provided in this embodiment can be obtained, which can be referred to Figure 4 .Depend on Figure 4 (a) It can be seen that in the imaging system provided by this embodiment, the spectral line bending corresponding to different wavelengths in each spectral band is less than 1.2μm at the central field of view, that is, less than 10% of the detector pixel, and the spectral line bending of the spectroscopic imaging system is well corrected; Figure 4 (b) It can be seen that in the central field of view of the imaging system, the color distortion corresponding to different wavelengths in each spectral band is less than 1.6μm, which is less than 14% of the detector pixel. The color distortion of the spectroscopic imaging system has been well corrected.

[0040] Further, based on the preferred parameter values ​​of each optical element in Table 1, a point spread function cross-sectional diagram of the imaging system provided in this embodiment can be obtained, which can be referred to Figure 5 .Depend on Figure 5 It can be seen that the spectral resolution of the system is better than 10 nm at wavelengths of (a) 1000 nm, (b) 1500 nm, (c) 2000 nm, and (d) 2500 nm, indicating that the imaging system provided in this embodiment achieves high spectral resolution imaging.

[0041] The imaging system provided by the embodiment of the present invention has the characteristics of achieving high numerical aperture and high signal-to-noise ratio spectral imaging, and opens up new avenues for cutting-edge research and technological applications in multiple fields.

[0042] Embodiment 2

[0043] Based on the same inventive concept, this embodiment provides a concentric glued curved prism spectroscopic hyperspectral imaging method, and its principle of solving the problem is similar to the concentric glued curved prism spectroscopic hyperspectral imaging system provided in Example 1, and the repeated parts will not be repeated.

[0044] The embodiment of the present invention provides a concentric glued curved prism spectroscopic hyperspectral imaging method, including but not limited to the following steps: The complex light is emitted to the plano-convex lens 2, and the plano-convex lens 2 is used to converge the specified aperture light beam in the complex light and correct the aberration to obtain a convergent light beam; The converging light beam is incident on the meniscus lens 3 glued to the plano-convex lens 2, and the converging light beam is diverged by the meniscus lens 3 to obtain a diverging light beam; The divergent light beam is incident on the first curved prism 4 and the second curved prism 5 glued to the first curved prism 4 in sequence, and the optical path is compensated by the oppositely placed vertex angles of the first curved prism 4 and the second curved prism 5, thereby generating a first monochromatic converging light beam and a second monochromatic converging light beam respectively; The first monochromatic converging light and the second monochromatic converging light are reflected at the surface of the second curved prism 5 away from the first curved prism 4, and are incident on the second curved prism 5, the first curved prism 4, the meniscus lens 3 and the plano-convex lens 2 in sequence, and finally converge to the image plane 6.

[0045] Embodiment 3

[0046] This embodiment provides a spectrometer, including the concentric glued curved prism spectroscopic hyperspectral imaging system provided in the first embodiment.

[0047] A spectrometer provided in an embodiment of the present invention covers the short-wave infrared spectrum and can be used on a remote sensing platform to obtain a three-dimensional data cube and analyze the composition of surface materials.

[0048] Embodiment 4

[0049] This embodiment provides a remote sensing platform, including a spectrometer provided in the third embodiment.

[0050] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A concentric cemented curved prism spectroscopic hyperspectral imaging system, characterized in that: include: A plano-convex lens is used to receive the emitted light and converge a light beam of a specified aperture in the light beam to obtain a convergent light beam; A meniscus lens, used for receiving and diverging the convergent light beam to obtain a divergent light beam; A first curved prism, used for receiving the divergent light beam and generating a first monochromatic converging light beam; A second curved prism, used for receiving the divergent light beam and generating a second monochromatic converging light beam; The first monochromatic converging light and the second monochromatic converging light are reflected at the surface of the second curved prism away from the first curved prism, and are incident on the second curved prism, the first curved prism, the meniscus lens and the plano-convex lens in sequence, and finally converge to the image plane; The convex spherical surface of the plano-convex lens and the concave surface of the meniscus lens are glued to each other; the surface of the first curved prism close to the second curved prism and the surface of the second curved prism close to the first curved prism are glued to each other; the vertex angle of the first curved prism and the vertex angle of the second curved prism are placed oppositely.

2. The concentric glued curved prism spectroscopic hyperspectral imaging system according to claim 1, characterized in that: The inner concave surfaces of the meniscus lens, the first curved prism and the second curved prism are all opposite to the incident direction of the light.

3. The concentric glued curved prism spectroscopic hyperspectral imaging system according to claim 1, characterized in that: The glass materials of the first curved prism and the second curved prism are different. The refractive indexes of the first curved prism and the second curved prism are n4 and n5 respectively, and the value ranges satisfy 1.65≤n4≤1.75 and 1.65≤n5≤1.75; the Abbe numbers of the first curved prism and the second curved prism are v4 and v5 respectively, and the value ranges satisfy 32≤v4≤36 and 34≤v5≤38.

4. The concentric glued curved prism spectroscopic hyperspectral imaging system according to claim 1, characterized in that: The object-side numerical aperture of the imaging system is NA, and the value range satisfies 0.10≤NA≤0.14; the tube length of the imaging system is L, and the value range satisfies 260mm≤L≤290mm.

5. The concentric glued curved prism spectroscopic hyperspectral imaging system according to claim 1, characterized in that: The aperture stop of the imaging system is arranged on a surface of the second curved prism away from the first curved prism.

6. The concentric glued curved prism spectroscopic hyperspectral imaging system according to claim 1, characterized in that: The imaging system comprises an object plane, and the object plane and the image plane are located at the same side in space.

7. The concentric glued curved prism spectroscopic hyperspectral imaging system according to claim 1, characterized in that: The surfaces of the plano-convex lens, the meniscus lens, the first curved prism and the second curved prism are all standard spherical surfaces.

8. A concentric cemented curved prism spectroscopic hyperspectral imaging method, characterized in that: include: The complex light is emitted to a plano-convex lens, and the plano-convex lens is used to converge a light beam of a specified aperture in the complex light and correct aberration to obtain a convergent light beam; The converging light beam is incident on a meniscus lens glued to the plano-convex lens, and the converging light beam is diverged by the meniscus lens to obtain a diverging light beam; The divergent light beam is incident on a first curved prism and a second curved prism glued to the first curved prism in sequence, and optical path compensation is performed through the oppositely placed vertex angles of the first curved prism and the second curved prism to generate a first monochromatic converging light beam and a second monochromatic converging light beam respectively; The first monochromatic converging light and the second monochromatic converging light are reflected at the surface of the second curved prism away from the first curved prism, and are incident on the second curved prism, the first curved prism, the meniscus lens and the plano-convex lens in sequence, and finally converge to the image plane.

9. A spectrometer, characterized in that: A concentric glued curved prism spectroscopic hyperspectral imaging system comprising the method described in any one of claims 1 to 7.

10. A remote sensing platform, characterized in that: A spectrometer comprising the method of claim 9.

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