Common prism type planetary spectral imaging system

Abstract

The invention belongs to the technical field of imaging spectroscopy, and particularly relates to a common prism type planetary spectral imaging system. The system comprises a visible light imaging lens group, an ultraviolet light imaging lens group, a common prism, an optical filter and a photoelectric detector, two-dimensional image information and one-dimensional spectral information of planetary geology enter the common prism through a visible channel and an ultraviolet channel at the same time, the common prism provides a transmission-type straight-through optical path for the visible channel and provides a periscope-type turning optical path for the ultraviolet channel, and the optical filter and the photoelectric detector are arranged on the common prism. The focal plane is partitioned by adopting a strip coating mode, so that the acquisition of ultraviolet-visible light spectrum information is realized. The common prism type planetary spectral imaging system has the advantages of high spectral resolution, high stability, wide detection, small system size, light weight and the like, and is suitable for deep space detection load.

Description

Technical Field

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

[0002] Planetary atmospheres and planetary geology are important exploration elements in the fields of deep space exploration and space astronomy. Deepening the wide-band detection and spectral identification of planetary climate change, water ice content, and surface topography is of great significance to the study of planetary origins and planetary resource exploration. Limited by the influence of the Earth's atmosphere on the characteristic absorption lines of oxygen, nitrogen, carbon, sulfur atoms and oxides, it is difficult to achieve ultraviolet spectral observation of planets by ground-based large-aperture telescopes. Based on this, ultraviolet observation of planets urgently needs to be observed outside the top layer of the atmosphere.

[0003] In order to detect the spectrum of planets, multiple ultraviolet spectrometers, visible spectrometers and wide and narrow field of view cameras are used in deep space to collect spectrum and image data, or to sacrifice time resolution to achieve detection. However, deep space exploration missions face the challenge of tight resources, so it is necessary to take into account both multi-dimensional detection (spectrum, image) and light and small wide-band detection.

[0004] Due to the limitations of ultraviolet transmission materials and spectroscopic methods, transmission-type common optical path optical imaging systems generally use dichroic mirrors for band spectrometry. The problems with dichroic mirror spectrometry are: the coating technology of the dichroic mirror will cause a significant loss of incident energy of the entire machine, while increasing the complexity of the optical path. The increase in mass and volume will increase the burden on the satellite platform, greatly reducing energy and utilization efficiency, and is not suitable for deep space exploration mission requirements. Summary of the invention

[0005] In view of this, the invention aims to provide a common prism planetary spectral imaging system to solve the problems that the existing planetary spectral imaging system cannot simultaneously obtain spectrum data from ultraviolet to visible light and that the micro-optical payload is difficult to achieve wide-band detection of planetary geology. The common prism planetary spectral imaging system of the present invention has the advantages of high spectral resolution, high stability, wide-band detection, small system size, light weight, etc., and is suitable for deep space exploration payloads.

[0006] To achieve the above object, the technical solution created by the present invention is implemented as follows: A common prism type planetary spectral imaging system comprises a visible light imaging lens group, an ultraviolet light imaging lens group, a common prism, a filter assembly and a photoelectric detector. The visible light imaging lens group and the ultraviolet light imaging lens group are arranged in parallel. A visible light beam is incident on the common prism through the visible light imaging lens group for transmission. Meanwhile, 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 by the common prism, they are expanded into monochromatic light in space through the filter assembly and imaged to the photoelectric detector.

[0007] Furthermore, the visible light beam and the ultraviolet light beam simultaneously obtain two-dimensional image information and one-dimensional spectral information of the planetary geology.

[0008] Further, 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, 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, and 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 0.586mm; the center thickness of the second lens is 1.638mm; the center thickness of the third lens is 0.812mm; the center thickness of the fourth lens is 1.265mm; the center thickness of the fifth lens is 0.506mm; the center thickness of the sixth lens is 1.278mm; the center thickness of the seventh lens is 0.844mm; The distance between the first lens and the second lens is 1.616mm; the distance between the second lens and the third lens is 3.582mm; the distance between the third lens and the fourth lens is 0.522mm; the distance between the fourth lens and the fifth lens is 0.027mm; the distance between the fifth lens and the sixth lens is 0.201mm; the distance between the sixth lens and the seventh lens is 0.25mm; the distance between the seventh lens and the common prism is 3.353mm.

[0009] Further, the ultraviolet imaging lens group includes at least an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens 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 radius of curvature of the front surface of the eighth lens is -5.521mm, and the radius of curvature of the rear surface of the eighth lens is 3.327mm; the radius of curvature of the front surface of the ninth lens is 3.684mm, and the radius of curvature of the rear surface of the ninth lens is 38.311mm; the radius of curvature of the front surface of the tenth lens is -8.390mm, and the radius of curvature of the rear surface of the tenth lens is -9.675mm; the radius of curvature of the front surface of the eleventh lens is 8.899mm, and the radius of curvature of the rear surface of the eleventh lens is 9.899mm. The radius of curvature of the rear surface of the 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; and 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 0.076 mm; and the distance between the fourteenth lens and the common prism is 1.284 mm.

[0010] Furthermore, the visible light beam and the ultraviolet light beam transmitted by the common prism are incident on the filter assembly in parallel.

[0011] Furthermore, the common prism is a trapezoidal prism, assuming 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 and the entrance pupil apertures of the visible light imaging mirror group and the ultraviolet light imaging mirror group satisfy: L2>L1>D+d.

[0012] Furthermore, the trapezoidal prism includes a first prism and a second prism, the visible light beam is incident on the first prism for transmission through the visible light imaging lens group, the ultraviolet light beam is incident on the second prism for reflection through the ultraviolet light imaging lens group, and the reflective surface of the second prism is coated with a reflective film.

[0013] Furthermore, the filter assembly includes 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.

[0014] Furthermore, the common prism type planetary spectral imaging system also includes an electrical 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 filter assembly is 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 electrical control box are respectively arranged on both sides of the detector mounting seat.

[0015] Compared with the prior art, the invention can achieve the following beneficial effects: The common prism planetary spectral imaging system created by the present invention, based on the transmission optical system, performs multi-band and multi-dimensional imaging of the target scene in the form of common prism and strip spectrometry, and realizes the simultaneous acquisition of ultraviolet-visible light spectrum information. The common prism planetary spectral imaging system of the present invention has the advantages of high spectral resolution, high stability, wide-band detection, small system size, and light weight, and is suitable for deep space exploration payloads. In addition, the present invention does not use a color separation mirror, but allows two separate channels to simultaneously perform detection and imaging on a detector through a common prism, which has the advantage of no energy loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings: Figure 1 A schematic diagram of the principle of a common prism planetary spectral imaging system for creating an embodiment of the present invention; Figure 2 A three-dimensional schematic diagram of a common prism planetary spectral imaging system for creating an embodiment of the present invention; Figure 3 A schematic diagram of the structure of the filter of the embodiment of the present invention; Figure 4 A cross-sectional view of a common prism planetary spectral imaging system that is an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a common prism planetary spectral imaging system according to an embodiment of the present invention.

[0017] Description of reference numerals: 1. Visible light imaging lens group; 2. Ultraviolet light imaging lens group; 3. Common prism; 4. Filter assembly; 5. Photoelectric detector; 6. Electric control box; 7. Visible lens tube; 8. Ultraviolet lens tube; 9. Common 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

[0018] In order to make the purpose, technical solution and advantages of the invention more clear, the invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the invention and do not constitute a limitation of the invention.

[0019] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are 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 on 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 number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0021] In the description of the invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0022] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0023] like Figure 1 As shown, the present invention provides a common prism type planetary spectral imaging system, comprising a visible light imaging lens group 1, an ultraviolet light imaging lens group 2, a common prism 3, a filter assembly 4 and a photoelectric detector 5. The visible light imaging lens group 1 and the ultraviolet light imaging lens group 2 are arranged in parallel, and the visible light beam is incident on the common prism 3 through the visible light imaging lens group 1 for transmission, and 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 expanded into monochromatic light in space through the filter assembly 4 and imaged to the photoelectric detector 5.

[0024] The two-dimensional image information and one-dimensional spectral information of planetary geology are simultaneously incident through the visible light channel and the ultraviolet light channel and converged to the common prism 3. The common prism 3 provides a transmission-type straight light path for the visible channel and a periscope-type deflection light path for the ultraviolet channel. The information transmitted by the visible light channel and the ultraviolet light channel are converged on the same focal plane through the common prism 3. The focal plane is partitioned by strip coating to achieve the acquisition of ultraviolet-visible light spectrum information.

[0025] In some embodiments, the visible light beam and the ultraviolet light beam simultaneously acquire two-dimensional image information and one-dimensional spectral information of the planetary geology.

[0026] In some embodiments, the visible light imaging lens group 1 includes at least a first lens 1-1, a second lens 1-2, a third lens 1-3, a fourth lens 1-4, a fifth lens 1-5, a sixth lens 1-6 and a seventh lens 1-7 arranged in sequence along the optical path direction, wherein 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 all F2.

[0027] It should be noted that the entrance pupil diameter of the visible light imaging mirror group 1 is set to D, and the visible light imaging mirror group 1 is composed of at least 3 pieces of aberration-free glasses, 3 pieces of apochromatic glasses and 1 piece of radiation-proof glass. The radiation-proof glass here is used to prevent radiation from radiation light in space, and is generally set at the window of the visible light imaging mirror group 1 (the radiation-proof glass is the first lens 1-1). The second lens 1-2, the fifth lens 1-5 and the sixth lens 1-6 constitute an apochromatic mirror group, and the third lens 1-3, the fourth lens 1-4 and the seventh lens 1-7 constitute an aberration-free mirror group. The light aperture of each glass is ≥D, and the rectangular field of view angle is X1×Y1. The rectangular field of view is designed to match the push-scan imaging mode of the TDI CCD. By extending the integration time of the TDI CCD, the signal-to-noise ratio of the visible band spectral dimension is increased while the imaging width is expanded.

[0028] In some embodiments, the ultraviolet imaging lens group 2 includes at least an eighth lens 2-1, a ninth lens 2-2, a tenth lens 2-3, an eleventh lens 2-4, a twelfth lens 2-5, a thirteenth lens 2-6 and a fourteenth lens 2-7 arranged in sequence along the optical path direction, wherein the material 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 is CALCITE, and the glass material used by the ninth lens 2-2 and the twelfth lens 2-5 is KBR.

[0029] It should be noted that the entrance pupil diameter of the ultraviolet imaging mirror group 2 is set to d, and it is composed of at least 3 pieces of aberration-free glasses, 3 pieces of apochromatic glasses and 1 piece of radiation-proof glass. The radiation-proof glass here is used to prevent radiation from space (the radiation-proof glass is the eighth lens 2-1), and is generally set at the window of the ultraviolet imaging mirror group 2. The ninth lens 2-2, the twelfth lens 2-5 and the thirteenth lens 2-6 constitute the apochromatic mirror group, and the tenth lens 2-3, the eleventh lens 2-4 and the fourteenth lens 2-7 constitute the aberration-free mirror group. The clear aperture of each glass is ≥ d, and the rectangular field of view is X2×Y2 (X1>X2, Y1>Y2). The rectangular field of view is designed to match the push-scan imaging mode of the TDI CCD. By extending the integration time of the TDI CCD, the signal-to-noise ratio of the ultraviolet band spectrum dimension is increased while the imaging width is expanded.

[0030] The visible light imaging lens set 1 and the ultraviolet light imaging lens set 2 can be adaptively adjusted according to the actual needs of the user.

[0031] 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.

[0032] In some embodiments, the common prism 3 is a trapezoidal prism, assuming 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 lens group 1 is D, and the entrance pupil aperture of the ultraviolet light imaging lens group 2 is d, the side length L1 of the lower base of the trapezoidal prism and the side length L2 of the upper base thereof and the entrance pupil apertures of the visible light imaging lens group 1 and the ultraviolet light imaging lens group 2 satisfy: L2>L1>D+d.

[0033] It should be noted that when light is incident on the middle part of the common prism 3 (transmission area 3-1), the common prism 3 is equivalent to a lens, and when light is incident on the edge position of the common prism 3 (reflection area 3-2), the common prism 3 is equivalent to a reflector. The common prism 3 uses SILICA as its material.

[0034] 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 reflective surface of the second prism 3-2 is coated with a reflective film.

[0035] It should be noted that the second prism 3 - 2 may be a rhombus prism or a combination of two triangular prisms.

[0036] In some embodiments, the filter assembly 4 includes 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.

[0037] 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 spectrum strip is set to M, and the coating width of the visible spectrum strip is set to N. The ultraviolet energy is lower than the visible energy, so the coating width needs to satisfy the formula: M=4N.

[0038] Example 1 The entire imaging system consists of four parts: visible light imaging lens group 1, ultraviolet light imaging lens group 2, common prism 3 and photoelectric detector 5. The three-dimensional size of the entire imaging system is 7mm×21mm×23mm. The distance of the planetary geological distance imaging system is set to 80km. The visible channel belongs to the refractive optical path structure, and the ultraviolet channel belongs to the folding optical path structure.

[0039] The visible channel has a wavelength range of 380-700nm, an entrance pupil diameter of 2mm, a rectangular field angle of 90°×1°, a focal length of 12mm, and an imaging width of >150km. The visible light imaging lens group 1 here consists of 3 aberration-free, 3 apochromatic glasses, and 1 radiation-proof glass to eliminate aberrations and chromatic aberrations in the visible light band. The aperture of each glass is ≥2mm. In terms of preparation materials and selection, the first lens 1-1 is a radiation-proof 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.

[0040] Table 1

[0041] The wavelength range of the ultraviolet channel is 280-380nm, the entrance pupil diameter is 2mm, the rectangular field angle is 60°×0.8°, the focal length is 10mm, the imaging width is>90km, and the ultraviolet imaging lens group 2 is composed of 6 pieces of aberration-proof achromatic glass (3 pieces of aberration-proof glass, 3 pieces of apochromatic glass) and 1 piece of radiation-proof glass to eliminate the aberration and chromatic aberration of the ultraviolet band. The aperture of each glass is ≥2mm. The total optical length of the ultraviolet channel is 15mm. In terms of preparation materials and selection, the eighth lens 2-1 is radiation-proof glass, 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.

[0042] Table 2

[0043] The filter assembly 4 is a fused quartz substrate composed of eight narrowband filters, of which three narrowband filters are located in the ultraviolet region and five narrowband filters are located in the visible region. The eight narrowband filters are coated in the form of spectral strips. The coating width of the spectral strips in the ultraviolet region is 200μm (20 pixels), and the coating width of the spectral strips in the visible region is 50μm (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. The front lens assembly is integrated with electronic devices (including an electric control box 6).

[0044] See also Figure 4The common prism type planetary spectral imaging system also includes an electric control box 6, a visible lens barrel 7, an ultraviolet lens barrel 8, a common prism mounting seat 9, and a detector mounting seat 10. The visible light imaging lens group 1 is mounted on the common prism mounting seat 9 via the visible lens barrel 7, the ultraviolet light imaging lens group 2 is mounted on the common prism mounting seat 9 via the ultraviolet lens barrel 8, the common prism 3 and the filter assembly 4 are mounted in the common prism mounting seat 9, the photoelectric detector 5 is mounted in the detector mounting seat 10, and the common prism mounting seat 9 and the electric control box 6 are respectively arranged on both sides of the detector mounting seat 10. Considering the deep space environment in which the system is located, when designing the mechanical structure, the mass should be reduced as much as possible under the premise of ensuring the structural performance.

[0045] See also Figure 5 The physical model includes a visible lens tube 7, an ultraviolet lens tube 8, an electric control box 6, etc. The weight of the whole machine is less than 2kg, and the volume of the whole machine is controlled within 20mm×40mm×50mm. The electric control box 6 is used for power supply.

[0046] In this scheme, the optical path of the entire optical system is through the common prism 3, split light path, and strip coating, which effectively makes up for the inability of deep space exploration to obtain ultraviolet-visible wide-band spectrum information. In the push-broom imaging mode, it can simultaneously obtain wide-band multi-spectral data cubes, which is of great significance in the field of planetary geological exploration.

[0047] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the disclosure of the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution disclosed in the present invention can be achieved, and this document does not limit this.

[0048] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in 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 at the same time, 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 by the common prism, they are expanded into monochromatic light in space through the filter assembly and imaged onto the photoelectric detector.

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 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.

4. 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.

5. 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.

6. 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.

7. The common prism planetary spectral imaging system according to claim 6, 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.

8. 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.

9. 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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