Optical lens for spatial modulation interferometric hyperspectral instrument and hyperspectral instrument

Abstract

The application provides a spatial modulation interference type hyperspectral instrument optical lens and a hyperspectral instrument, and can solve the problems of complex structure and great design difficulty of each lens group of the existing spatial modulation interference type hyperspectral instrument optical lens. The optical lens comprises a front objective lens group, a slit, an interference prism group, a Fourier lens group and a cylindrical lens group, the focal lengths of the front objective lens group, the Fourier lens group and the cylindrical lens group are 29.6mm-30.5mm, 59.4mm-60.6mm and 33.5mm-34.5mm respectively, the reciprocals of the relative apertures are 5.9-6.1, 5.9-6.1 and 1.9-2.1 respectively, the front objective lens group is used for collecting optical signals on the object side, the width of the slit is 0.03mm±0.003mm and the slit is used for filtering, the interference prism group is used for splitting and interfering the filtered imaging signals to form an interference spectrum pattern, the Fourier lens group is used for performing Fourier optical transformation on the interference spectrum pattern, the cylindrical lens group is used for expanding the spectrum dimension of the Fourier optically transformed interference spectrum pattern to form an interference spectrum image and then the interference spectrum image is incident on an external detector.

Description

TECHNICAL FIELD

[0001] The present application relates to optical lens, specifically to a spatial modulation interference type hyperspectral optical lens and a hyperspectral. BACKGROUND

[0002] Spectrometer can obtain both image information and spectral information, and is widely used in material detection, meteorology, remote sensing and other fields. Spectrometer is divided into multispectral, hyperspectral and ultrahigh spectral according to its spectral resolution, and is divided into spectroscopic, diffraction and interference spectrometer according to the method of obtaining spectral information. The interference type spectrometer can be divided into two categories: time modulation interference type spectrometer and spatial modulation interference type spectrometer. The time modulation interference type spectrometer is formed on the basis of Michelson interferometer, and has poor real-time performance due to its moving mechanism. The spatial modulation interference type spectrometer has high spectral resolution, good real-time performance and stability, and is widely concerned in the fields of airborne and spaceborne. At present, the main difficulties of spatial modulation interference type hyperspectral are interference formation and optical lens design. The existing spatial modulation interference type hyperspectral optical lens usually includes front objective group, slit, interference prism group, Fourier mirror group and cylindrical mirror group arranged in sequence along the propagation direction of incident light, and the structure of each mirror group is very complex, which has great design difficulty. SUMMARY

[0003] The present application aims to solve the technical problem that the structure of each mirror group of the existing spatial modulation interference type hyperspectral optical lens is very complex and has great design difficulty, and provides a spatial modulation interference type hyperspectral optical lens and a hyperspectral.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] A spatial modulation interference type hyperspectral optical lens, comprising front objective group, slit, interference prism group, Fourier mirror group and cylindrical mirror group arranged in sequence along the propagation direction of incident light; and the special feature is that:

[0006] The focal length of the front objective group is 29.6mm-30.5mm, and the reciprocal of the relative aperture is 5.9-6.1, and the front objective group is used for collecting optical signals in the object side;

[0007] The slit is located at the image plane position of the front objective group, and is used for filtering the imaging signals in the spectral dimension of the detector in the optical signals in the object side;

[0008] The interference prism group is used for splitting and coherent interference of the filtered imaging signals, and forms an interference spectral pattern;

[0009] The Fourier mirror group has a focal length of 59.4mm-60.6mm and a reciprocal of relative aperture of 5.9-6.1, and is used for Fourier optical transformation of the interference spectrum pattern;

[0010] The cylindrical mirror group has a focal length of 33.5mm-34.5mm and a reciprocal of relative aperture of 1.9-2.1, and is used for spectrum dimension expansion of the interference spectrum pattern after Fourier optical transformation, to form an interference spectrum image and be incident to an external detector;

[0011] The width of the slit is 0.03mm±0.003mm.

[0012] Further, the front objective group comprises, sequentially arranged along the light path propagation direction, an A1 lens, an A2 lens, an A3 lens, an A4 lens, an A5 lens, an A6 lens, an A7 lens, an A8 lens, an A9 lens, and an A10 lens, and the front objective group has a clear aperture of ≤25mm; parameters of the A1 lens to the A10 lens are as follows:

[0013] The A1 lens has a curvature radius of 24.29mm for a first surface, a refractive index of 1.656827, and a dispersion coefficient of 52.35; and a curvature radius of 15.03mm for a second surface;

[0014] The A2 lens has a curvature radius of 18.72mm for a first surface, a refractive index of 1.879092, and a dispersion coefficient of 41.03; and a curvature radius of 43.69mm for a second surface;

[0015] The A3 lens has a curvature radius of 13.13mm for a first surface, a refractive index of 1.786965, and a dispersion coefficient of 47.82; and a curvature radius of 18.20mm for a second surface;

[0016] The A4 lens has a curvature radius of 13.25mm for a first surface, a refractive index of 1.824995, and a dispersion coefficient of 21.71; and a curvature radius of 6.66mm for a second surface;

[0017] The A5 lens has a curvature radius of 30.07mm for a first surface, a refractive index of 1.729164, and a dispersion coefficient of 54.67; an optical stop is arranged on the light path between the first surface of the A5 lens and the second surface of the A4 lens; and the second surface of the A5 lens is cemented with the first surface of the A6 lens;

[0018] The A6 lens has a curvature radius of -12.00mm for a first surface, a refractive index of 1.761875, and a dispersion coefficient of 50.45; and a curvature radius of -8.82mm for a second surface;

[0019] The radius of curvature of the first surface of the A7 lens is -7.62 mm, the refractive index is 1.687499, and the dispersion coefficient is 24.95; the radius of curvature of the second surface of the A7 lens is 61.72 mm;

[0020] The radius of curvature of the first surface of the A8 lens is -16.00 mm, the refractive index is 1.939007, and the dispersion coefficient is 19.81; the radius of curvature of the second surface of the A8 lens is -15.49 mm;

[0021] The radius of curvature of the first surface of the A9 lens is -61.62 mm; the radius of curvature of the second surface of the A9 lens is -17.95 mm;

[0022] The radius of curvature of the first surface of the A10 lens is 52.46 mm; the refractive index of the first surface of the A9 lens and the first surface of the A10 lens is 1.883003, and the dispersion coefficient is 40.81; the radius of curvature of the second surface of the A10 lens is 329.86 mm;

[0023] The distance between the first surface of the A1 lens and the image surface of the front objective lens group is ≤60 mm.

[0024] Further, the Fourier lens group comprises, in sequence along the light path propagation direction, a B1 lens, a B2 lens, a B3 lens, a B4 lens, a B5 lens, a B6 lens, a B7 lens, a B8 lens, a B9 lens, and a B10 lens, and the clear aperture of the Fourier lens group is ≤60 mm; the parameters of the B1 lens to the B10 lens are as follows:

[0025] The radius of curvature of the first surface of the B1 lens is -46.90 mm, the refractive index is 1.919390, and the dispersion coefficient is 28.39; the radius of curvature of the second surface of the B1 lens is -34.73 mm, the refractive index is 1.614031, and the dispersion coefficient is 53.68;

[0026] The second surface of the B1 lens is cemented with the first surface of the B2 lens; the radius of curvature of the second surface of the B2 lens is 343.23 mm;

[0027] The radius of curvature of the first surface of the B3 lens is -150.64 mm, the refractive index is 1.895951, and the dispersion coefficient is 27.08; the second surface of the B3 lens is cemented with the first surface of the B4 lens;

[0028] The radius of curvature of the first surface of the B4 lens is -32.42 mm, the refractive index is 1.433848, and the dispersion coefficient is 95.23; the second surface of the B4 lens is cemented with the first surface of the B5 lens;

[0029] The radius of curvature of the first surface of the B5 lens is 36.94 mm, the refractive index is 1.642576, and the dispersion coefficient is 3.16; the radius of curvature of the second surface of the B5 lens is 192.96 mm;

[0030] The radius of curvature of the first surface of the B6 lens is 61.35 mm, the refractive index is 1.456500, and the dispersion coefficient is 90.27; the second surface of the B6 lens is glued to the first surface of the B7 lens;

[0031] The radius of curvature of the first surface of the B7 lens is -113.09 mm, the refractive index is 1.740754, and the dispersion coefficient is 22.63; the radius of curvature of the second surface of the B7 lens is 67.65 mm;

[0032] The radius of curvature of the first surface of the B8 lens is -40.98 mm, the refractive index is 1.668492, and the dispersion coefficient is 52.04; the second surface of the B8 lens is glued to the first surface of the B9 lens;

[0033] The radius of curvature of the first surface of the B9 lens is 62.74 mm, the refractive index is 1.588226, and the dispersion coefficient is 32.89; the radius of curvature of the second surface of the B9 lens is 1249.44 mm;

[0034] The radius of curvature of the first surface of the B10 lens is 47.77 mm, the refractive index is 1.884005, and the dispersion coefficient is 40.57; the radius of curvature of the second surface of the B10 lens is -45.23 mm;

[0035] The distance between the first surface of the B1 lens and the second surface of the B10 lens is ≤180 mm.

[0036] Further, the cylindrical lens group includes a C1 lens, a C2 lens, a C3 lens, a C4 lens, a C5 lens, a C6 lens, and a C7 lens arranged in sequence along the light path propagation direction, and the clear aperture of the cylindrical lens group (5) is ≤18 mm; the parameters of the C1 lens to the C7 lens are as follows:

[0037] The radius of curvature of the first surface of the C1 lens is -17.65 mm, the refractive index is 1.46, and the dispersion coefficient is 90.27; the radius of curvature of the second surface of the C1 lens is -27.95 mm;

[0038] The radius of curvature of the first surface of the C2 lens is 15.74 mm, the refractive index is 1.945958, and the dispersion coefficient is 17.94; the radius of curvature of the second surface of the C2 lens is 13.45 mm;

[0039] The radius of curvature of the first surface of the C3 lens is 27.38 mm, the refractive index is 1.733644, and the dispersion coefficient is 54.03; the radius of curvature of the second surface of the C3 lens is -55.01 mm;

[0040] The radius of curvature of the first surface of the C4 lens is 31.41 mm, the refractive index is 1.729164, and the dispersion coefficient is 54.67; the second surface of the C4 lens is glued to the first surface of the C5 lens;

[0041] The radius of curvature of the first surface of the C5 lens is -10.01 mm, the refractive index is 1.807125, and the dispersion coefficient is 2.88; the radius of curvature of the second surface of the C5 lens is 12.16 mm;

[0042] The radius of curvature of the first surface of the C6 lens is 11.19 mm, the refractive index is 1.433848, and the dispersion coefficient is 95.23; the radius of curvature of the second surface of the C6 lens is 11.98 mm;

[0043] The radius of curvature of the first surface of the C7 lens is 15.05 mm, the refractive index is 1.945958, and the dispersion coefficient is 17.94; the radius of curvature of the second surface of the C7 lens is 30.38 mm;

[0044] The distance between the entrance pupil surface of the cylindrical lens group and the focal plane is ≤57 mm.

[0045] Further, the spacings between the adjacent surfaces of the first surface of the A1 lens to the image surface of the front objective lens group in the direction of light propagation are 3.50 mm, 3.61 mm, 3.67 mm, 2.79 mm, 3.20 mm, 1.40 mm, 3.40 mm, 2.72 mm, 0.30 mm, 2.43 mm, 4.16 mm, 1.02 mm, 2.00 mm, 3.17 mm, 5.12 mm, 0.30 mm, 4.47 mm, 0.30 mm, 4.32 mm, 6.00 mm, respectively;

[0046] The spacings between the adjacent surfaces of the confocal surface of the Fourier lens group to the second surface of the B10 lens in the direction of light propagation are 121.56 mm, 3.00 mm, 15.77 mm, 0.30 mm, 3.00 mm, 20.08 mm, 3.00 mm, 3.97 mm, 3.00 mm, 10.54 mm, 82.64 mm, 7.49 mm, 4.59 mm, 17.16 mm, 3.00 mm, 0.90 mm, respectively;

[0047] The interval between the adjacent surfaces of the entrance pupil surface to the focal plane of the cylindrical lens group in the light path propagation direction is 6.00mm, 2.00mm, 0.30mm, 6.45mm, 1.48mm, 3.37mm, 0.30mm, 5.41mm, 7.50mm, 0.38mm, 7.50mm, 0.81mm, 7.50mm, 7.42mm in sequence.

[0048] The second surface of the B10 lens is coplanar with the entrance pupil surface of the cylindrical lens group.

[0049] Further, the interference prism group is a pentagonal prism structure formed by combining a first half pentagonal prism and a second half pentagonal prism, the light transmission aperture of the interference prism group is 32mm-38mm, and the equivalent optical path is 76mm-90mm; the length of the first half pentagonal prism in the direction of the combination edge is less than the length of the second half pentagonal prism in the direction of the combination edge by at most one wavelength.

[0050] Further, the light transmission aperture of the interference prism group is 35mm, the equivalent optical path is 82mm, and the material is quartz.

[0051] Meanwhile, the application also provides a spatial modulation interference type hyperspectral instrument, which is special in that:

[0052] The spatial modulation interference type hyperspectral instrument optical lens is adopted.

[0053] The application has the following beneficial effects:

[0054] 1. The application provides a spatial modulation interference type hyperspectral instrument optical lens, which reasonably sets the focal length and the reciprocal of the relative aperture of each lens group, and each lens group has a simple structure and a reduced design difficulty.

[0055] 2. The application reasonably sets the curvature radius, refractive index and dispersion coefficient of each lens in each lens group, and simultaneously considers the imaging effect under a wide spectral range and the interval of each lens surface, so that an engineering optimal solution is realized, that is, a miniaturized design under a high transfer function condition is realized, and the volume and weight are small.

[0056] 3. The interference prism group in the application adopts a first half pentagonal prism and a second half pentagonal prism to form a pentagonal prism structure based on the interference imaging principle, so that the requirement of hyperspectral imaging can be met without using any moving mechanism, and therefore the reliability and stability are good, and the application is suitable for harsh environments such as airborne and spaceborne.

[0057] 4. The application can realize real-time acquisition of hyperspectral data and image data, the spectral resolution is ≤8.2nm, and up to 140 spectral channel data can be obtained in the imaging spectral range of 400nm-900nm. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 is a schematic diagram of an assembly structure of an optical lens of a spatial modulation interference type hyperspectral instrument according to an embodiment of the present application;

[0059] Figure 2 is a schematic diagram of an assembly structure of another view of an embodiment of the present application;

[0060] Figure 3 is a schematic diagram of a structure of a front objective lens group in an embodiment of the present application;

[0061] Figure 4 is a diffraction modulation transfer function (Diffraction MTF) diagram of the front objective lens group in an embodiment of the present application;

[0062] Figure 5 is a schematic diagram of a structure of an interference prism group in an embodiment of the present application;

[0063] Figure 6 is a schematic diagram of a structure of a Fourier lens group in an embodiment of the present application;

[0064] Figure 7 is a diffraction modulation transfer function diagram of the Fourier lens group in an embodiment of the present application;

[0065] Figure 8 is a schematic diagram of a structure of a cylindrical lens group in an embodiment of the present application;

[0066] Figure 9 is a diffraction modulation transfer function diagram of the cylindrical lens group in an embodiment of the present application.

[0067] Explanation of reference signs:

[0068] 1 - pre-objective group, 2 - slit, 3 - interference prism group, 4 - Fourier mirror group, 5 - cylindrical mirror group, 6 - detector, 7 - confocal plane, 8 - entrance pupil plane, 9 - first half-pentagonal prism, 10 - second half-pentagonal prism, 11 - diaphragm, 15 - focal plane, 21 - image plane, A1 -1 - first surface of the A1 lens, A1 -2 - second surface of the A1 lens, A2 -1 - first surface of the A2 lens, A2 -2 - second surface of the A2 lens, A3 -1 - first surface of the A3 lens, A3 -2 - second surface of the A3 lens, A4 -1 - first surface of the A4 lens, A4 -2 - second surface of the A4 lens, A5 -1 - first surface of the A5 lens, A6 -1 - first surface of the A6 lens, A6 -2 - second surface of the A6 lens, A7 -1 - first surface of the A7 lens, A7 -2 - second surface of the A7 lens, A8 -1 - first surface of the A8 lens, A8 -2 - second surface of the A8 lens, A9 -1 - first surface of the A9 lens, A9 -2 - second surface of the A9 lens, A10 -1 - first surface of the A10 lens, A10 -2 - second surface of the A10 lens, B1 -1 - first surface of the B1 lens, B1 -2 - second surface of the B1 lens, B2 -2 - second surface of the B2 lens, B3 -1 - first surface of the B3 lens, B4 -1 - first surface of the B4 lens, B5 -1 - first surface of the B5 lens, B5 -2 - second surface of the B5 lens, B6 -1 - first surface of the B6 lens, B7 -1 - first surface of the B7 lens, B7 -2 - second surface of the B7 lens, B8 -1 - first surface of the B8 lens, B9 -1 - first surface of the B9 lens, B9 -2 - second surface of the B9 lens, B10 -1 - first surface of the B10 lens, B10 -2 - second surface of the B10 lens, C1 -1 - first surface of the C1 lens, C1 -2 - second surface of the C1 lens, C2 -1 - first surface of the C2 lens, C2 -2 - second surface of the C2 lens, C3 -1 - first surface of the C3 lens, C3 -2 - second surface of the C3 lens, C4 -1 - first surface of the C4 lens, C5 -1 - first surface of the C5 lens, C5 -2 - second surface of the C5 lens, C6 -1 - first surface of the C6 lens, C6 -2 - second surface of the C6 lens, C7 -1 - first surface of the C7 lens, C7 -2 - second surface of the C7 lens. DETAILED DESCRIPTION

[0069] As Figures 1-3As shown, an optical lens for a spatial modulation interferometric hyperspectral imager includes a front objective lens group 1, a slit 2, an interference prism group 3, a Fourier mirror group 4, and a cylindrical mirror group 5 arranged sequentially along the direction of incident light propagation. Specifically, the front objective lens group 1 has a focal length of 29.6 mm to 30.5 mm and a relative aperture reciprocal of 5.9 to 6.1. The front objective lens group 1 is used to acquire object-side optical signals. The slit 2 is located at the image plane 21 of the front objective lens group 1 and is used to filter the imaging signal along the 6-dimensional spectral direction of the detector in the object-side optical signal. The interference prism group 3 is used to split and coherently interfere the filtered imaging signal to form an interference spectrum pattern. The Fourier mirror group 4 has a focal length of 59.4 mm to 60.6 mm and a relative aperture reciprocal of 5.9 to 6.1. 6.1 The Fourier lens group 4 is used to perform Fourier optical transform on the interference spectrum pattern. The focal length of the cylindrical lens group 5 is 33.5mm to 34.5mm, and the reciprocal of the relative aperture is 1.9 to 2.1. The cylindrical lens group 5 is used to expand the spectral dimensions of the interference spectrum pattern after the Fourier optical transform, forming an interference spectrum image that is incident on the external detector 6. That is, the incident light passes through the front objective lens group 1 and the slit 2, and then rotates 90° at the interference prism group 3. The reflected light then passes from left to right through the Fourier lens group 4 and the cylindrical lens group 5 and converges to reach the detector 6. The width of the slit 2 is 0.03mm ± 0.003mm. The wavelength of this optical lens is 400nm to 900nm, the field of view is 36.9°, the spectral resolution is ≤8.2nm, and the number of spectral channels is as high as 140. Including the base plate and structural components, the volume of this optical lens is ≤400mm × 150mm × 78mm. In this embodiment, the parameters of the optical lens, the front objective lens group 1, the slit 2, the Fourier lens group 4, and the cylindrical lens group 5 are shown in Table 1:

[0070] Table 1

[0071]

[0072] like Figure 3 As shown, the front objective lens group 1 includes 10 lenses arranged sequentially along the optical path propagation direction, forming 20 optical surfaces and 1 image plane 21. Light rays pass through the 20 surfaces shown in the figure from left to right to reach the image plane 21. The distance between the first surface A1-1 of the A1 lens and the image plane 21 of the front objective lens group 1 is ≤60mm. The maximum aperture of the front objective lens group 1 is ≤25mm, and the weight is ≤35g. The second surface of the A5 lens is cemented to the first surface A6-1 of the A6 lens. An aperture stop 11 is provided in the optical path between the first surface A5-1 of the A5 lens and the second surface A4-2 of the A4 lens. In this embodiment, the radius of curvature, spacing, refractive index, and dispersion coefficient of each lens surface are shown in Table 2.

[0073] Table 2

[0074]

[0075] like Figure 4 As shown, the diffraction modulation transfer function of the front objective lens group 1 can reach above 0.3 under the condition of 90 lp / mm.

[0076] like Figure 5 As shown, the interference prism group 3 is a pentagonal prism structure composed of a first half-pentagonal prism 9 and a second half-pentagonal prism 10. The joining edges are the 9-2 facet of the first half-pentagonal prism 9 and the 10-3 facet of the second half-pentagonal prism 10, respectively. The aperture of the interference prism group 3 is 35mm, the equivalent optical path is 82mm, and the material is quartz. Light is incident through the 9-1 facet of the first half-pentagonal prism 9 in the figure, and is split by the joining surfaces 9-2 and 10-3 of the first half-pentagonal prism 9 and the second half-pentagonal prism 10. One beam of light exits through the 9-2, 9-3, 9-4, 9-2, and 10-4 faces, while the other beam exits through the 10-3, 10-1, 10-2, 10-3, and 10-4 faces. When assembling surfaces 9-4 and 10-2, the following condition must be met: the length of the first half-pentagonal prism 9 along the splicing edge direction is at most one wavelength smaller than the length of the second half-pentagonal prism 10 along the splicing edge direction, in order to achieve an interference pattern.

[0077] like Figure 6 As shown, the Fourier lens group 4 includes 10 lenses arranged sequentially along the light propagation direction, forming 15 optical surfaces and 1 confocal surface 7. Specifically, the second surface B1-2 of lens B1 is cemented to the first surface of lens B2; the second surface of lens B3 is cemented to the first surface B4-1 of lens B4; the second surface of lens B4 is cemented to the first surface B5-1 of lens B5; the second surface of lens B6 is cemented to the first surface B7-1 of lens B7; the second surface of lens B8 is cemented to the first surface B9-1 of lens B9; and the second surface of lens B10 coincides with the exit pupil surface of the Fourier lens group 4. Light rays travel from left to right from the confocal surface 7, passing sequentially through 14 optical surfaces to reach the exit pupil surface, i.e., the second surface of lens B10. The distance between the first surface B1-1 of lens B1 and the second surface B10-2 of lens B10 is ≤180mm, the maximum aperture of Fourier lens group 4 is ≤60mm, and the weight is ≤500g. In this embodiment, the radius of curvature, spacing, refractive index, and dispersion coefficient of each lens surface are shown in Table 3.

[0078] Table 3

[0079]

[0080] like Figure 7 As shown, the diffraction modulation transfer function of Fourier lens group 4 can reach above 0.4 under the condition of 90 lp / mm.

[0081] like Figure 8As shown, the cylindrical lens group 5 includes 7 lenses arranged sequentially along the light path propagation direction, forming 13 optical surfaces and 1 entrance pupil surface 8. The second surface of lens C4 is cemented to the first surface C5-1 of lens C5. Light rays pass sequentially from left to right through the entrance pupil surface 8 shown in the figure, passing through the 13 optical surfaces to reach the focal plane 15, located 7.42424 mm behind the second surface C7-2 of lens C7. The focal plane 15 is virtual. The distance between the entrance pupil surface 8 and the focal plane 15 of the cylindrical lens group 5 is ≤57 mm, the maximum aperture of the cylindrical lens group 5 is ≤18 mm, and the weight is approximately 30 g. In this embodiment, the radius of curvature, spacing, refractive index, and dispersion coefficient of each lens surface are shown in Table 4.

[0082] Table 4

[0083]

[0084] like Figure 9 As shown, the diffraction modulation transfer function of the cylindrical lens group 5 can reach above 0.4 under the condition of 90 lp / mm. In this embodiment, the confocal surface 7 of the Fourier lens group 4 coincides with the image plane 21 of the front objective lens group 1. The second surface B10-2 of the B10 lens is coplanar with the entrance pupil surface 8 of the cylindrical lens group 5, and the focal plane of the detector 6 is coplanar with the focal plane 15 of the cylindrical lens group 5. In addition, the present invention also provides a spatial modulation interferometric hyperspectrometer using the above-mentioned optical lenses.

[0085] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A spatial modulation interferometric hyperspectral optical lens, comprising a front objective group (1), a slit (2), an interference prism group (3), a Fourier lens group (4) and a cylindrical lens group (5) arranged in sequence along the propagation direction of incident light; characterized in that: the focal length of the front objective group (1) is 29.6mm-30.5mm, and the reciprocal of the relative aperture is 5.9-6.1, and the front objective group (1) is used for collecting object optical signals; the slit (2) is located at the image plane (21) of the front objective group (1), and is used for filtering the imaging signals in the spectral dimension of the detector (6) in the object optical signals; the interference prism group (3) is used for splitting and coherent interference of the filtered imaging signals to form an interference spectral pattern; the focal length of the Fourier lens group (4) is 59.4mm-60.6mm, and the reciprocal of the relative aperture is 5.9-6.1, and the Fourier lens group (4) is used for Fourier optical transformation of the interference spectral pattern; the focal length of the cylindrical lens group (5) is 33.5mm-34.5mm, and the reciprocal of the relative aperture is 1.9-2.1, and the cylindrical lens group (5) is used for spectral dimension expansion of the Fourier optical transformed interference spectral pattern to form an interference spectral image and be incident to an external detector (6); the width of the slit (2) is 0.03mm±0.003mm.

2. The spatial modulation interferometric hyperspectral optical lens according to claim 1, characterized in that: the front objective group (1) comprises an A1 lens, an A2 lens, an A3 lens, an A4 lens, an A5 lens, an A6 lens, an A7 lens, an A8 lens, an A9 lens and an A10 lens arranged in sequence along the propagation direction of the light path, and the clear aperture of the front objective group (1) is ≤25mm; the parameters of the A1 lens to the A10 lens are as follows: the curvature radius of the first surface (A1-1) of the A1 lens is 24.29mm, the refractive index is 1.656827, and the dispersion coefficient is 52.35; the curvature radius of the second surface (A1-2) of the A1 lens is 15.03mm; the curvature radius of the first surface (A2-1) of the A2 lens is 18.72mm, the refractive index is 1.879092, and the dispersion coefficient is 41.03; the curvature radius of the second surface (A2-2) of the A2 lens is 43.69mm; the curvature radius of the first surface (A3-1) of the A3 lens is 13.13mm, the refractive index is 1.786965, and the dispersion coefficient is 47.82; the curvature radius of the second surface (A3-2) of the A3 lens is 18.20mm; the curvature radius of the first surface (A4-1) of the A4 lens is 13.25mm, the refractive index is 1.824995, and the dispersion coefficient is 21.71; the curvature radius of the second surface (A4-2) of the A4 lens is 6.66mm; ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The radius of curvature of the first surface (A5-1) of the A5 lens is 30.07 mm, the refractive index is 1.729164, and the dispersion coefficient is 54.67; an optical stop (11) is arranged on the optical path between the first surface (A5-1) of the A5 lens and the second surface (A4-2) of the A4 lens; the second surface of the A5 lens is cemented with the first surface (A6-1) of the A6 lens; The radius of curvature of the first surface (A6-1) of the A6 lens is -12.00 mm, the refractive index is 1.761875, and the dispersion coefficient is 50.45; the radius of curvature of the second surface (A6-2) of the A6 lens is -8.82 mm; The radius of curvature of the first surface (A7-1) of the A7 lens is -7.62 mm, the refractive index is 1.687499, and the dispersion coefficient is 24.95; the radius of curvature of the second surface (A7-2) of the A7 lens is 61.72 mm; The radius of curvature of the first surface (A8-1) of the A8 lens is -16.00 mm, the refractive index is 1.939007, and the dispersion coefficient is 19.81; the radius of curvature of the second surface (A8-2) of the A8 lens is -15.49 mm; The radius of curvature of the first surface (A9-1) of the A9 lens is -61.62 mm; the radius of curvature of the second surface (A9-2) of the A9 lens is -17.95 mm; The radius of curvature of the first surface (A10-1) of the A10 lens is 52.46 mm; the refractive index of the first surface (A9-1) of the A9 lens and the first surface (A10-1) of the A10 lens is 1.883003, and the dispersion coefficient is 40.81; the radius of curvature of the second surface (A10-2) of the A10 lens is 329.86 mm; The distance between the first surface (A1-1) of the A1 lens and the image surface (21) of the front objective lens group (1) is ≤60 mm.

3. The spatial modulation interferometric hyperspectral optical lens according to claim 2, characterized in that: The Fourier lens group (4) comprises, in sequence along the optical path propagation direction, a B1 lens, a B2 lens, a B3 lens, a B4 lens, a B5 lens, a B6 lens, a B7 lens, a B8 lens, a B9 lens, and a B10 lens, and the clear aperture of the Fourier lens group (4) is ≤60 mm; the parameters of the B1 lens to the B10 lens are as follows: The radius of curvature of the first surface (B1-1) of the B1 lens is -46.90 mm, the refractive index is 1.919390, and the dispersion coefficient is 28.39; the radius of curvature of the second surface (B1-2) of the B1 lens is -34.73 mm, the refractive index is 1.614031, and the dispersion coefficient is 53.68; The second surface (B1-2) of the B1 lens is cemented with the first surface of the B2 lens; the radius of curvature of the second surface (B2-2) of the B2 lens is 343.23 mm; The radius of curvature of the first surface (B3-1) of the B3 lens is -150.64 mm, the refractive index is 1.895951, and the dispersion coefficient is 27.08; the second surface of the B3 lens is cemented with the first surface (B4-1) of the B4 lens; The radius of curvature of the first surface of the B4 lens (B4-1) is -32.42 mm, the refractive index is 1.433848, and the dispersion coefficient is 95.23; the second surface of the B4 lens is glued with the first surface of the B5 lens (B5-1); The radius of curvature of the first surface of the B5 lens (B5-1) is 36.94 mm, the refractive index is 1.642576, and the dispersion coefficient is 3.16; the radius of curvature of the second surface of the B5 lens (B5-2) is 192.96 mm; The radius of curvature of the first surface of the B6 lens (B6-1) is 61.35 mm, the refractive index is 1.456500, and the dispersion coefficient is 90.27; the second surface of the B6 lens is glued with the first surface of the B7 lens (B7-1); The radius of curvature of the first surface of the B7 lens (B7-1) is -113.09 mm, the refractive index is 1.740754, and the dispersion coefficient is 22.63; the radius of curvature of the second surface of the B7 lens (B7-2) is 67.65 mm; The radius of curvature of the first surface of the B8 lens (B8-1) is -40.98 mm, the refractive index is 1.668492, and the dispersion coefficient is 52.04; the second surface of the B8 lens is glued with the first surface of the B9 lens (B9-1); The radius of curvature of the first surface of the B9 lens (B9-1) is 62.74 mm, the refractive index is 1.588226, and the dispersion coefficient is 32.89; the radius of curvature of the second surface of the B9 lens (B9-2) is 1249.44 mm; The radius of curvature of the first surface of the B10 lens (B10-1) is 47.77 mm, the refractive index is 1.884005, and the dispersion coefficient is 40.57; the radius of curvature of the second surface of the B10 lens (B10-2) is -45.23 mm; The distance between the first surface of the B1 lens (B1-1) and the second surface of the B10 lens (B10-2) is ≤180 mm.

4. The spatial modulation interference type hyperspectral optical lens according to claim 3, characterized in that: The cylindrical lens group (5) comprises a C1 lens, a C2 lens, a C3 lens, a C4 lens, a C5 lens, a C6 lens, and a C7 lens arranged in sequence along the light path propagation direction, and the clear aperture of the cylindrical lens group (5) is ≤18 mm; the parameters of the C1 lens to the C7 lens are as follows: The radius of curvature of the first surface of the C1 lens (C1-1) is -17.65 mm, the refractive index is 1.46, and the dispersion coefficient is 90.27; the radius of curvature of the second surface of the C1 lens (C1-2) is -27.95 mm; The radius of curvature of the first surface of the C2 lens (C2-1) is 15.74 mm, the refractive index is 1.945958, and the dispersion coefficient is 17.94; the radius of curvature of the second surface of the C2 lens (C2-2) is 13.45 mm; The radius of curvature of the first surface of the C3 lens (C3-1) is 27.38 mm, the refractive index is 1.733644, and the dispersion coefficient is 54.03; the radius of curvature of the second surface of the C3 lens (C3-2) is -55.01 mm; The radius of curvature of the first surface (C4-1) of the fourth lens is 31.41 mm, the refractive index is 1.729164, and the dispersion coefficient is 54.67; the second surface of the fourth lens is glued with the first surface (C5-1) of the fifth lens; The radius of curvature of the first surface (C5-1) of the fifth lens is -10.01 mm, the refractive index is 1.807125, and the dispersion coefficient is 2.88; the radius of curvature of the second surface (C5-2) of the fifth lens is 12.16 mm; The radius of curvature of the first surface (C6-1) of the sixth lens is 11.19 mm, the refractive index is 1.433848, and the dispersion coefficient is 95.23; the radius of curvature of the second surface (C6-2) of the sixth lens is 11.98 mm; The radius of curvature of the first surface (C7-1) of the seventh lens is 15.05 mm, the refractive index is 1.945958, and the dispersion coefficient is 17.94; the radius of curvature of the second surface (C7-2) of the seventh lens is 30.38 mm; The distance between the entrance pupil surface (8) of the cylindrical lens group (5) and the focal plane (15) is ≤57 mm.

5. The spatial modulation interferometric hyperspectral optical lens according to claim 4, wherein: The distance between the first surface (A1-1) of the first A1 lens and the image surface (21) of the front objective lens group (1) along the light path propagation direction is 3.50 mm, 3.61 mm, 3.67 mm, 2.79 mm, 3.20 mm, 1.40 mm, 3.40 mm, 2.72 mm, 0.30 mm, 2.43 mm, 4.16 mm, 1.02 mm, 2.00 mm, 3.17 mm, 5.12 mm, 0.30 mm, 4.47 mm, 0.30 mm, 4.32 mm, 6.00 mm, in sequence; The distance between the confocal surface (7) of the Fourier lens group (4) and the second surface (B10-2) of the tenth B10 lens along the light path propagation direction is 121.56 mm, 3.00 mm, 15.77 mm, 0.30 mm, 3.00 mm, 20.08 mm, 3.00 mm, 3.97 mm, 3.00 mm, 10.54 mm, 82.64 mm, 7.49 mm, 4.59 mm, 17.16 mm, 3.00 mm, 0.90 mm, in sequence; The distance between the entrance pupil surface (8) of the cylindrical lens group (5) and the focal plane (15) along the light path propagation direction is 6.00 mm, 2.00 mm, 0.30 mm, 6.45 mm, 1.48 mm, 3.37 mm, 0.30 mm, 5.41 mm, 7.50 mm, 0.38 mm, 7.50 mm, 0.81 mm, 7.50 mm, 7.42 mm, in sequence; The second surface (B10-2) of the tenth B10 lens is coplanar with the entrance pupil surface (8) of the cylindrical lens group (5).

6. The spatial modulation interferometric hyperspectral optical lens according to claim 5, wherein: The interference prism group (3) is a pentagonal prism structure which is composed of a first half pentagonal prism (9) and a second half pentagonal prism (10), the light aperture of the interference prism group (3) is 32mm-38mm, and the equivalent optical path is 76mm-90mm; the length of the first half pentagonal prism (9) along the splicing edge direction is less than the length of the second half pentagonal prism (10) along the splicing edge direction by at most one wavelength.

7. The spatial modulation interferometric hyperspectral optical lens according to claim 6, characterized in that: The light aperture of the interference prism group (3) is 35mm, the equivalent optical path is 82mm, and the material is quartz.

8. A spatial modulation interferometric hyperspectral instrument, characterized in that: The spatial modulation interferometric hyperspectral optical lens according to any one of claims 1-7 is used.

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