Common prism type planetary spectral imaging system

Abstract

The present invention belongs to the technical field of imaging spectroscopy, and particularly relates to a common prism type planetary spectral imaging system. The system includes a visible light imaging lens group, an ultraviolet light imaging lens group, a common prism, a filter, and a photodetector. The two-dimensional image information and one-dimensional spectral information of planetary geology are simultaneously incident on the common prism through the visible channel and the ultraviolet channel. The common prism provides a transmissive direct optical path for the visible channel and a periscope type folding optical path for the ultraviolet channel, and divides the focal plane by means of strip coating to realize the acquisition of spectral information of ultraviolet-visible light. The common prism type planetary spectral imaging system of the present invention has advantages such as high spectral resolution, high stability, wide area detection, small system volume, and light weight, and is suitable for deep space exploration payloads.

Description

Technical Field

[0001] The present invention belongs to the technical field of imaging spectroscopy, and particularly relates to a common prism type planetary spectral imaging system. Background Art

[0002] Planetary atmosphere and planetary geology are important detection elements in fields such as deep space exploration and space astronomy. Deepening the wide-range detection and spectral identification of planetary climate change, water ice content, and surface topography has very important significance for studying planetary origin and planetary resource exploration. Limited by the characteristic absorption lines of oxygen, nitrogen, carbon, sulfur atoms, and oxides in the Earth's atmosphere, it is difficult to achieve ground-based large-aperture telescope ultraviolet spectral observations of planets. Based on this, ultraviolet observations of planets urgently need to be carried out outside the top of the atmosphere.

[0003] To achieve the detection of planetary spectra, multiple ultraviolet spectrometers, visible spectrometers, and wide and narrow field cameras are used in deep space to collect spectral and image data, or the time resolution is sacrificed to achieve detection. However, deep space exploration missions face the challenge of resource tension, so it is necessary to simultaneously consider multi-dimensional detection (spectrum, image) and lightweight and wide-field detection.

[0004] Due to the limitations of ultraviolet band transmission materials and spectroscopic methods, transmissive common path optical imaging systems generally use dichroic mirrors for band spectroscopy. The problems of dichroic mirror spectroscopy are as follows: the coating technology of dichroic mirrors will cause a large loss of the incident energy of the whole machine, while increasing the complexity of the optical path. The increase in mass and volume leads to an increased burden on the spaceborne platform, and the energy and utilization efficiency are greatly reduced, which is not suitable for the mission requirements of deep space exploration. Summary of the Invention

[0005] In view of this, the present invention aims to provide a common prism type planetary spectral imaging system to solve problems such as the existing planetary spectral imaging systems being unable to simultaneously obtain spectral data from ultraviolet to visible light and the difficulty of micro-miniature optical payloads in achieving wide-field detection of planetary geology. The common prism type planetary spectral imaging system of the present invention has advantages such as high spectral resolution, high stability, wide-field detection, small system volume, and light weight, and is suitable for deep space exploration payloads.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows:

[0007] A common prism type planetary spectral imaging system includes a visible light imaging lens group, an ultraviolet light imaging lens group, a common prism, a filter assembly, and a photodetector. The visible light imaging lens group and the ultraviolet light imaging lens group are arranged in parallel. The visible light beam is incident on the common prism through the visible light imaging lens group for transmission, and at the same time, the ultraviolet light beam is incident on the common prism through the ultraviolet light imaging lens group. After the visible light beam is transmitted through the common prism and the ultraviolet light beam is reflected by the common prism, they jointly pass through the filter assembly and are expanded into monochromatic light in space and imaged onto the photodetector.

[0008] Furthermore, the visible light beam and the ultraviolet light beam simultaneously acquire two-dimensional image information and one-dimensional spectral information of the planetary geology.

[0009] Furthermore, the visible light imaging lens group includes at least a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence along the optical path direction. Among them, the materials of the second lens, the third lens, and the seventh lens are all H-FK61, the material of the first lens is Hk9L, the material of the fourth lens is TF3, the material of the fifth lens is H-ZPK5, and the material of the sixth lens is H-K3;

[0010] The curvature radius of the front surface of the first lens is -7.076 mm, and the curvature radius of the rear surface of the first lens is 5.415 mm; the curvature radius of the front surface of the second lens is 14.504 mm, and the curvature radius of the rear surface of the second lens is -7.04 mm; the curvature radius of the front surface of the third lens is -6.286 mm, and the curvature radius of the rear surface of the third lens is -7.074 mm; the curvature radius of the front surface of the fourth lens is 12.079 mm, and the curvature radius of the rear surface of the fourth lens is -2.122 mm; the curvature radius of the front surface of the fifth lens is -2.071 mm, and the curvature radius of the rear surface of the fifth lens is 4.536 mm; the curvature radius of the front surface of the sixth lens is 5.163 mm, and the curvature radius of the rear surface of the sixth lens is -39.276 mm; the curvature radius of the front surface of the seventh lens is 6.619 mm, and the curvature radius of the rear surface of the seventh lens is 10.42 mm;

[0011] The central thickness of the first lens is 0.586 mm; the central thickness of the second lens is 1.638 mm; the central thickness of the third lens is 0.812 mm; the central thickness of the fourth lens is 1.265 mm; the central thickness of the fifth lens is 0.506 mm; the central thickness of the sixth lens is 1.278 mm; the central thickness of the seventh lens is 0.844 mm;

[0012] The distance between the first lens and the second lens is 1.616 mm; the distance between the second lens and the third lens is 3.582 mm; the distance between the third lens and the fourth lens is 0.522 mm; the distance between the fourth lens and the fifth lens is 0.027 mm; the distance between the fifth lens and the sixth lens is 0.201 mm; the distance between the sixth lens and the seventh lens is 0.25 mm; the distance between the seventh lens and the common prism is 3.353 mm.

[0013] Further, the ultraviolet light imaging lens group includes at least the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, and the fourteenth lens arranged in sequence along the optical path direction. Among them, the material of the eighth lens is SILICA, the materials of the tenth lens, the eleventh lens, the thirteenth lens, and the fourteenth lens are CALCITE, and the glass materials used for the ninth lens and the twelfth lens are KBR;

[0014] The radius of curvature of the front surface of the eighth lens is -5.521 mm, and the radius of curvature of the rear surface of the eighth lens is 3.327 mm; the radius of curvature of the front surface of the ninth lens is 3.684 mm, and the radius of curvature of the rear surface of the ninth lens is 38.311 mm; the radius of curvature of the front surface of the tenth lens is -8.390 mm, and the radius of curvature of the rear surface of the tenth lens is -9.675 mm; the radius of curvature of the front surface of the eleventh lens is 8.899 mm, and the radius of curvature of the rear surface of the eleventh lens is -4.491 mm; the radius of curvature of the front surface of the twelfth lens is -3.328 mm, and the radius of curvature of the rear surface of the twelfth lens is 9.355 mm; the radius of curvature of the front surface of the thirteenth lens is 11.897 mm, and the radius of curvature of the rear surface of the thirteenth lens is -6.352 mm; the radius of curvature of the front surface of the fourteenth lens is 5.630 mm, and the radius of curvature of the rear surface of the fourteenth lens is 5.804 mm;

[0015] The central thickness of the eighth lens is 0.594 mm; the central thickness of the ninth lens is 0.914 mm; the central thickness of the tenth lens is 0.616 mm; the central thickness of the eleventh lens is 0.965 mm; the central thickness of the twelfth lens is 0.520 mm; the central thickness of the thirteenth lens is 0.922 mm; the central thickness of the fourteenth lens is 0.647 mm;

[0016] The distance between the eighth lens and the ninth lens is 0.5 mm; the distance between the ninth lens and the tenth lens is 4.006 mm; the distance between the tenth lens and the eleventh lens is 0.760 mm; the distance between the eleventh lens and the twelfth lens is 0.350 mm; the distance between the twelfth lens and the thirteenth lens is 0.366 mm; the distance between the thirteenth lens and the fourteenth lens is 0.076 mm; the distance between the fourteenth lens and the common prism is 1.284 mm.

[0017] Furthermore, the visible light beam and the ultraviolet light beam transmitted by the common prism are incident on the filter assembly in parallel.

[0018] Furthermore, the common prism is a trapezoidal prism. Let the side length of the lower base of the trapezoidal prism be L1, the side length of the upper base of the trapezoidal prism be L2, the entrance pupil diameter of the visible light imaging lens group be D, and the entrance pupil diameter of the ultraviolet light imaging lens group be d. The side length L1 of the lower base of the trapezoidal prism and its upper base side length L2 satisfy the following relationship with the entrance pupil diameters of the visible light imaging lens group and the ultraviolet light imaging lens group: L2 > L1 > D + d.

[0019] Furthermore, the trapezoidal prism includes a first prism and a second prism. The visible light beam is incident on the first prism through the visible light imaging lens group for transmission, and the ultraviolet light beam is incident on the second prism through the ultraviolet light imaging lens group for reflection. The reflection surface of the second prism is coated with a reflective film.

[0020] Furthermore, the filter assembly includes an ultraviolet spectral band and a visible spectral band. The coating width of the ultraviolet spectral band is four times that of the visible spectral band.

[0021] Furthermore, the common prism type planetary spectral imaging system further includes an electronic control box, a visible light barrel, an ultraviolet light barrel, a common prism mounting seat, and a detector mounting seat. The visible light imaging lens group is mounted on the common prism mounting seat through the visible light barrel, the ultraviolet light imaging lens group is mounted on the common prism mounting seat through the ultraviolet light barrel, the common prism and the filter assembly are mounted in the common prism mounting seat, the photodetector is mounted in the detector mounting seat, and the common prism mounting seat and the electronic control box are respectively arranged on both sides of the detector mounting seat.

[0022] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0023] The co-prism type planetary spectral imaging system of the present invention creates, on the basis of a transmissive optical system, multi-band and multi-dimensional imaging of a target scene through the form of a co-prism and strip spectroscopy, achieving the simultaneous acquisition of ultraviolet-visible spectral information. The co-prism type planetary spectral imaging system of the present invention has the advantages of high spectral resolution, high stability, wide-field detection, small system volume, light weight, etc., and is suitable for deep space exploration payloads. In addition, the present invention does not apply a dichroic mirror, but instead enables two separate channels to detect and image simultaneously on a single detector through a co-prism, which has the advantage of no energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0025] Figure 1 is a schematic diagram of the principle of the co-prism type planetary spectral imaging system according to an embodiment of the present invention;

[0026] Figure 2 is a three-dimensional diagram of the co-prism type planetary spectral imaging system according to an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of the filter structure according to an embodiment of the present invention;

[0028] Figure 4 is a cross-sectional view of the co-prism type planetary spectral imaging system according to an embodiment of the present invention;

[0029] Figure 5 is a schematic diagram of the structure of the co-prism type planetary spectral imaging system according to an embodiment of the present invention.

[0030] DESCRIPTION OF THE REFERENCE NUMERALS:

[0031] 1, visible light imaging lens group; 2, ultraviolet light imaging lens group; 3, co-prism; 4, filter assembly; 5, photodetector; 6, electronic control box; 7, visible light barrel; 8, ultraviolet light barrel; 9, co-prism mounting seat; 10, detector mounting seat; 1-1, first lens; 1-2, second lens; 1-3, third lens; 1-4, fourth lens; 1-5, fifth lens; 1-6, sixth lens; 1-7, seventh lens; 2-1, eighth lens; 2-2, ninth lens; 2-3, tenth lens; 2-4, eleventh lens; 2-5, twelfth lens; 2-6, thirteenth lens; 2-7, fourteenth lens; 3-1, first prism; 3-2, second prism. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than constituting a limitation to the present invention.

[0033] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0036] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0037] As Figure 1 shown, the present invention provides a common prism type planetary spectral imaging system, which includes a visible light imaging lens group 1, an ultraviolet light imaging lens group 2, a common prism 3, a filter assembly 4 and a photodetector 5. The visible light imaging lens group 1 and the ultraviolet light imaging lens group 2 are arranged in parallel. The visible light beam is incident on the common prism 3 through the visible light imaging lens group 1 for transmission. At the same time, the ultraviolet light beam is incident on the common prism 3 through the ultraviolet light imaging lens group 2. After the visible light beam is transmitted through the common prism 3 and the ultraviolet light beam is reflected by the common prism 3, they are jointly expanded into monochromatic light in space through the filter assembly 4 and imaged onto the photodetector 5.

[0038] Two-dimensional image information and one-dimensional spectral information of planetary geology are incident and converged to a common prism 3 through visible light channels and ultraviolet light channels at the same time. The common prism 3 provides a transmissive direct optical path for the visible channel and a periscope-type folding optical path for the ultraviolet channel. The information transmitted by the visible light channel and the ultraviolet light channel respectively is converged on the same focal plane in the form of the common prism 3, and the focal plane is partitioned by strip coating to obtain the spectral information of ultraviolet-visible light.

[0039] In some embodiments, visible light beams and ultraviolet light beams simultaneously acquire two-dimensional image information and one-dimensional spectral information of planetary geology.

[0040] In some embodiments, the visible light imaging lens group 1 includes at least the first lens 1-1, the second lens 1-2, the third lens 1-3, the fourth lens 1-4, the fifth lens 1-5, the sixth lens 1-6, and the seventh lens 1-7 arranged in sequence along the optical path direction. Among them, the materials of the first lens 1-1, the third lens 1-3, the fourth lens 1-4, the sixth lens 1-6, and the seventh lens 1-7 are all H-ZBAF16, and the materials of the second lens 1-2 and the fifth lens 1-5 are both F2.

[0041] It should be noted that the entrance pupil diameter of the visible light imaging lens group 1 is set as D. The visible light imaging lens group 1 is composed of at least 3 pieces of achromatic aberration glass, 3 pieces of apochromatic glass, and 1 piece of anti-radiation glass. Here, the anti-radiation glass is used to prevent the radiation of radiation light in space, and is generally arranged at the window of the visible light imaging lens group 1 (the anti-radiation glass is the first lens 1-1). The second lens 1-2, the fifth lens 1-5, and the sixth lens 1-6 form an apochromatic lens group, and the third lens 1-3, the fourth lens 1-4, and the seventh lens 1-7 form an achromatic aberration lens group. The clear aperture of each piece of glass is ≥D, and the rectangular field of view angle is X1×Y1. The design of the rectangular field of view is to match the push-broom imaging mode of the TDI CCD. By extending the integration time of the TDI CCD, while expanding the imaging width, the signal-to-noise ratio of the visible band spectrum dimension is increased.

[0042] In some embodiments, the ultraviolet light imaging lens group 2 includes at least the eighth lens 2-1, the ninth lens 2-2, the tenth lens 2-3, the eleventh lens 2-4, the twelfth lens 2-5, the thirteenth lens 2-6, and the fourteenth lens 2-7 arranged in sequence along the optical path direction. Among them, the materials of the eighth lens 2-1, the tenth lens 2-3, the eleventh lens 2-4, the thirteenth lens 2-6, and the fourteenth lens 2-7 are CALCITE, and the glass materials used for the ninth lens 2-2 and the twelfth lens 2-5 are KBR.

[0043] It should be noted that the entrance pupil diameter of the ultraviolet imaging lens group 2 is set as d, which is composed of at least 3 achromatic aberration glasses, 3 apochromatic glasses, and 1 radiation-proof glass. Here, the radiation-proof glass is used to prevent the radiation of radiation light in space (the radiation-proof glass is the eighth lens 2-1), and is generally arranged at the window of the ultraviolet imaging lens group 2. The ninth lens 2-2, the twelfth lens 2-5, and the thirteenth lens 2-6 form an apochromatic lens group, and the tenth lens 2-3, the eleventh lens 2-4, and the fourteenth lens 2-7 form an achromatic aberration lens group. The clear aperture of each glass is ≥d, and the rectangular field of view angle is X2×Y2 (X1>X2, Y1>Y2). The design of the rectangular field of view is to match the push-broom imaging mode of the TDI CCD. By extending the integration time of the TDI CCD, while expanding the imaging width, the signal-to-noise ratio in the spectral dimension of the ultraviolet band is increased.

[0044] The visible light imaging lens group 1 and the ultraviolet light imaging lens group 2 can be adaptively adjusted according to the actual needs of users.

[0045] In some embodiments, the visible light beam and the ultraviolet light beam transmitted by the common prism 3 are incident on the filter assembly 4 in parallel.

[0046] In some embodiments, the common prism 3 is a trapezoidal prism. Let the side length of the lower base of the trapezoidal prism be L1, the side length of the upper base of the trapezoidal prism be L2, the entrance pupil diameter of the visible light imaging lens group 1 be D, and the entrance pupil diameter of the ultraviolet light imaging lens group 2 be d. The side length L1 of the lower base of the trapezoidal prism and its side length L2 of the upper base satisfy: L2>L1>D + d with respect to the entrance pupil diameters of the visible light imaging lens group 1 and the ultraviolet light imaging lens group 2.

[0047] It should be noted that when the light is incident on the middle part (transmission area 3-1) of the common prism 3, the common prism 3 is equivalent to a lens, and when the light is incident on the edge position (reflection area 3-2) of the common prism 3, the common prism 3 is equivalent to a mirror. The common prism 3 uses SILICA as its material.

[0048] In some embodiments, the trapezoidal prism includes a first prism 3-1 and a second prism 3-2. The visible light beam is incident on the first prism 3-1 through the visible light imaging lens group 1 for transmission, and the ultraviolet light beam is incident on the second prism 3-2 through the ultraviolet light imaging lens group 2 for reflection. The reflection surface of the second prism 3-2 is coated with a reflective film.

[0049] It should be noted that the second prism 3-2 can be a rhombic prism or a combination of two triangular prisms.

[0050] In some embodiments, the filter assembly 4 includes an ultraviolet spectral band and a visible spectral band, and the coating width of the ultraviolet spectral band is four times that of the visible spectral band.

[0051] It should be noted that since the signal is low in the ultraviolet band, the data of the ultraviolet channel is obtained by merging 4×4 pixels. The coating width of the ultraviolet spectral band is set as M, and the coating width of the visible spectral band is set as N. Since the ultraviolet energy is lower than the visible energy, the coating width needs to satisfy the formula: M = 4N.

[0052] Embodiment 1

[0053] The entire imaging system consists of four parts: a visible light imaging lens group 1, an ultraviolet light imaging lens group 2, a common prism 3, and a photodetector 5. The three-dimensional size of the entire imaging system is 7mm×21mm×23mm. The distance of the planetary geology distance imaging system is set as 80km. The visible channel belongs to a refractive optical path structure, and the ultraviolet channel belongs to a folded optical path structure.

[0054] The wavelength range of the visible channel is 380 - 700nm, the entrance pupil diameter is 2mm, the rectangular field of view angle is 90°×1°, the focal length is 12mm, and the imaging width > 150km. The visible light imaging lens group 1 here consists of 3 achromatic aberration lenses, 3 apochromatic lenses, and 1 anti-radiation glass lens, used to eliminate the aberration and chromatic aberration in the visible light band. The clear aperture of each glass lens ≥ 2mm. In terms of material preparation and selection, the first lens 1-1 is anti-radiation glass, and the relevant parameters of the second lens 1-2, the third lens 1-3, the fourth lens 1-4, the fifth lens 1-5, the sixth lens 1-6, and the seventh lens 1-7 are shown in Table 1.

[0055] Table 1

[0056]

[0057] The wavelength range of the ultraviolet channel is 280 - 380nm, the entrance pupil diameter is 2mm, the rectangular field of view angle is 60°×0.8°, the focal length is 10mm, and the imaging width > 90km. The ultraviolet light imaging lens group 2 consists of 6 achromatic aberration and apochromatic lenses (3 achromatic aberration lenses, 3 apochromatic lenses) and 1 anti-radiation glass lens, used to eliminate the aberration and chromatic aberration in the ultraviolet band. The clear aperture of each glass lens ≥ 2mm. The total optical length of the ultraviolet light channel is 15mm. In terms of material preparation and selection, the eighth lens 2-1 is anti-radiation glass, and the relevant parameters of the ninth lens 2-2, the tenth lens 2-3, the eleventh lens 2-4, the twelfth lens 2-5, the thirteenth lens 2-6, and the fourteenth lens 2-7 are shown in Table 2.

[0058] Table 2

[0059]

[0060] The filter assembly 4 is a fused silica substrate composed of eight narrow-band filters. Among them, three narrow-band filters are located in the ultraviolet region, and five narrow-band filters are located in the visible light region. The above eight narrow-band filters are all coated in the form of spectral bands. The coating width of the spectral bands in the ultraviolet region is 200 μm (20 pixels), and the coating width of the spectral bands in the visible light region is 50 μm (5 pixels). The front lens assembly is mainly composed of a visible light imaging lens group 1 and an ultraviolet light imaging lens group 2, and the front lens assembly is integrated with electronic devices (including the electronic control box 6).

[0061] See Figure 4 , the common prism type planetary spectral imaging system also includes an electronic control box 6, a visible light lens barrel 7, an ultraviolet light lens barrel 8, a common prism mounting seat 9, and a detector mounting seat 10. The visible light imaging lens group 1 is installed on the common prism mounting seat 9 through the visible light lens barrel 7, and the ultraviolet light imaging lens group 2 is installed on the common prism mounting seat 9 through the ultraviolet light lens barrel 8. The common prism 3 and the filter assembly 4 are installed in the common prism mounting seat 9, and the photodetector 5 is installed in the detector mounting seat 10. The common prism mounting seat 9 and the electronic control box 6 are respectively arranged on both sides of the detector mounting seat 10. Considering the deep space environment where the system is located, when designing the mechanical structure, the mass should be reduced as much as possible on the premise of ensuring the structural performance.

[0062] See Figure 5 , the physical model includes the visible light lens barrel 7, the ultraviolet light lens barrel 8, the electronic control box 6, etc. The total weight of the whole machine is <2 kg, and the volume of the whole machine is controlled within 20 mm × 40 mm × 50 mm. The electronic control box 6 is used for power supply.

[0063] In this solution, the optical path of the entire optical system effectively compensates for the inability to obtain ultraviolet-visible wide-spectrum map information in deep space exploration through the common prism 3, splitting the optical path, and strip coating. In the push-broom imaging mode, it is possible to simultaneously obtain a data cube of wide-band multi-spectral data, which is of great significance in the field of planetary geological exploration.

[0064] It should be understood that various forms of the processes shown above can be used, steps can be reordered, added, or deleted. For example, the steps recorded in the disclosure of the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution disclosed in the present invention can be achieved. This is not limited herein.

[0065] The above specific embodiments do not constitute a limitation to the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A common prism planetary spectral imaging system, characterized in that: It comprises a visible light imaging lens group, an ultraviolet light imaging lens group, a common prism, a filter assembly and a photoelectric detector. A visible light beam is incident on the common prism through the visible light imaging lens group, and an ultraviolet light beam is incident on the common prism through the ultraviolet light imaging lens group. After the visible light beam is transmitted through the common prism and the ultraviolet light beam is reflected through the common prism, they are expanded into monochromatic light in space through the filter assembly and imaged to the photoelectric detector. The visible light imaging lens group comprises at least a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence along the optical path direction, wherein the second lens, the third lens and the seventh lens are all made of H-FK61, the first lens is made of Hk9L, the fourth lens is made of TF3, the fifth lens is made of H-ZPK5, and the sixth lens is made of H-K3; The radius of curvature of the front surface of the first lens is -7.076mm, and the radius of curvature of the rear surface of the first lens is 5.415mm; the radius of curvature of the front surface of the second lens is 14.504mm, and the radius of curvature of the rear surface of the second lens is -7.04mm; the radius of curvature of the front surface of the third lens is -6.286mm, and the radius of curvature of the rear surface of the third lens is -7.074mm; the radius of curvature of the front surface of the fourth lens is 12.079mm , the radius of curvature of the rear surface of the fourth lens is -2.122mm; the radius of curvature of the front surface of the fifth lens is -2.071mm, and the radius of curvature of the rear surface of the fifth lens is 4.536mm; the radius of curvature of the front surface of the sixth lens is 5.163mm, and the radius of curvature of the rear surface of the sixth lens is -39.276mm; the radius of curvature of the front surface of the seventh lens is 6.619mm, and the radius of curvature of the rear surface of the seventh lens is 10.42mm; The center thickness of the first lens is 0.586 mm; the center thickness of the second lens is 1.638 mm; the center thickness of the third lens is 0.812 mm; the center thickness of the fourth lens is 1.265 mm; the center thickness of the fifth lens is 0.506 mm; the center thickness of the sixth lens is 1.278 mm; and the center thickness of the seventh lens is 0.844 mm; The distance between the first lens and the second lens is 1.616 mm; the distance between the second lens and the third lens is 3.582 mm; the distance between the third lens and the fourth lens is 0.522 mm; the distance between the fourth lens and the fifth lens is 0.027 mm; the distance between the fifth lens and the sixth lens is 0.201 mm; the distance between the sixth lens and the seventh lens is 0.25 mm; and the distance between the seventh lens and the common prism is 3.353 mm.

2. The common prism planetary spectral imaging system according to claim 1, characterized in that: The visible light beam and the ultraviolet light beam simultaneously acquire two-dimensional image information and one-dimensional spectrum information of planetary geology.

3. The common prism planetary spectral imaging system according to claim 1, characterized in that: The ultraviolet imaging lens group comprises at least an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens which are arranged in sequence along the optical path direction, wherein the material of the eighth lens is SILICA, the material of the tenth lens, the eleventh lens, the thirteenth lens and the fourteenth lens is CALCITE, and the glass material used by the ninth lens and the twelfth lens is KBR; The curvature radius of the front surface of the eighth lens is -5.521mm, and the curvature radius of the rear surface of the eighth lens is 3.327mm; the curvature radius of the front surface of the ninth lens is 3.684mm, and the curvature radius of the rear surface of the ninth lens is 38.311mm; the curvature radius of the front surface of the tenth lens is -8.390mm, and the curvature radius of the rear surface of the tenth lens is -9.675mm; the curvature radius of the front surface of the eleventh lens is 8.899mm, and the curvature radius of the eleventh lens is 9.899mm. The radius of curvature of the rear surface of the eleventh lens is -4.491 mm; the radius of curvature of the front surface of the twelfth lens is -3.328 mm, and the radius of curvature of the rear surface of the twelfth lens is 9.355 mm; the radius of curvature of the front surface of the thirteenth lens is 11.897 mm, and the radius of curvature of the rear surface of the thirteenth lens is -6.352 mm; the radius of curvature of the front surface of the fourteenth lens is 5.630 mm, and the radius of curvature of the rear surface of the fourteenth lens is 5.804 mm; The center thickness of the eighth lens is 0.594 mm; the center thickness of the ninth lens is 0.914 mm; the center thickness of the tenth lens is 0.616 mm; the center thickness of the eleventh lens is 0.965 mm; the center thickness of the twelfth lens is 0.520 mm; the center thickness of the thirteenth lens is 0.922 mm; the center thickness of the fourteenth lens is 0.647 mm; The distance between the eighth lens and the ninth lens is 0.5 mm; the distance between the ninth lens and the tenth lens is 4.006 mm; the distance between the tenth lens and the eleventh lens is 0.760 mm; the distance between the eleventh lens and the twelfth lens is 0.350 mm; the distance between the twelfth lens and the thirteenth lens is 0.366 mm; the distance between the thirteenth lens and the fourteenth lens is 0.876 mm; and the distance between the fourteenth lens and the common prism is 1.284 mm.

4. The common prism planetary spectral imaging system according to claim 1, characterized in that: The visible light beam and the ultraviolet light beam transmitted by the common prism are incident on the filter assembly in parallel.

5. The common prism planetary spectral imaging system according to claim 1, characterized in that: The common prism is a trapezoidal prism. Assume that the side length of the lower base of the trapezoidal prism is L1, the side length of the upper base of the trapezoidal prism is L2, the entrance pupil aperture of the visible light imaging mirror group is D, and the entrance pupil aperture of the ultraviolet light imaging mirror group is d. The side length L1 of the lower base of the trapezoidal prism and the side length L2 of the upper base thereof satisfy the entrance pupil apertures of the visible light imaging mirror group and the ultraviolet light imaging mirror group: L2>L1>D+d.

6. The common prism planetary spectral imaging system according to claim 5, characterized in that: The trapezoidal prism includes a first prism and a second prism. The visible light beam is incident on the first prism through the visible light imaging lens group for transmission, and the ultraviolet light beam is incident on the second prism through the ultraviolet light imaging lens group for reflection. The reflective surface of the second prism is coated with a reflective film.

7. The common prism planetary spectral imaging system according to claim 1, characterized in that: The filter assembly comprises an ultraviolet spectrum strip and a visible spectrum strip, and the coating width of the ultraviolet spectrum strip is four times the coating width of the visible spectrum strip.

8. The common prism planetary spectral imaging system according to claim 1, characterized in that: The common prism type planetary spectral imaging system also includes an electric control box, a visible lens barrel, an ultraviolet lens barrel, a common prism mounting seat, and a detector mounting seat. The visible light imaging lens group is mounted on the common prism mounting seat via the visible lens barrel, the ultraviolet light imaging lens group is mounted on the common prism mounting seat via the ultraviolet lens barrel, the common prism and the filter assembly are mounted in the common prism mounting seat, the photoelectric detector is mounted in the detector mounting seat, and the common prism mounting seat and the electric control box are respectively arranged on both sides of the detector mounting seat.

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