CN112578555A - Common-caliber multi-channel wide-spectrum-band large-view-field imaging optical system - Google Patents
Common-caliber multi-channel wide-spectrum-band large-view-field imaging optical system Download PDFInfo
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- CN112578555A CN112578555A CN202011593616.6A CN202011593616A CN112578555A CN 112578555 A CN112578555 A CN 112578555A CN 202011593616 A CN202011593616 A CN 202011593616A CN 112578555 A CN112578555 A CN 112578555A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/12—Beam splitting or combining systems operating by refraction only
- G02B27/126—The splitting element being a prism or prismatic array, including systems based on total internal reflection
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Abstract
A common-caliber multi-channel wide-spectrum-band large-view-field imaging optical system belongs to the technical field of space optical remote sensing, and comprises: the device comprises a reflecting optical lens group, a semi-reflecting semi-permeable spectroscope, a beam splitter prism, a parallel flat lens group, an ultraviolet lens group, a visible light lens group, a medium wave infrared lens group and a long wave infrared lens group; the optical signal irradiates the reflection optical lens group, is reflected by the main reflection optical lens group and then enters the semi-reflecting and semi-transmitting spectroscope, and a part of the optical signal is split by the spectroscope, respectively enters the ultraviolet lens group and the visible light lens group and is received by the ultraviolet band detector and the visible light band detector; the other part is split by a parallel flat lens set with a certain wedge angle, enters the medium wave infrared lens set and the long wave infrared lens set respectively, and is received by the medium wave infrared detector and the long wave infrared detector. The invention is beneficial to the layout of the whole structure, and can adjust each branch circuit at the back end to change into a secondary imaging structure, which has very important significance for the inhibition of stray light.
Description
Technical Field
The invention belongs to the technical field of space optical remote sensing, and particularly relates to a common-caliber multi-channel wide-spectrum-band large-view-field imaging optical system.
Background
With the rapid development of the aerospace technology, the multispectral imaging remote sensing technology has extremely important application in the aspects of resource monitoring, emergency disaster relief, military reconnaissance and the like, and in order to obtain spectral band information of ultraviolet, visible light, medium wave infrared, long wave infrared and the like at the same time and better obtain more earth observation information, the development of a large-view-field multispectral imaging space optical remote sensor is particularly important.
For the technical problem of multispectral observation imaging, researches are made at different degrees at home and abroad, for example, the Landsat series earth observation satellite system in the united states can obtain spectral information of visible light, near infrared and short wave infrared, but does not cover the middle wave infrared, long wave infrared and ultraviolet spectral bands, and the observation spectral bands are not comprehensive enough. Most domestic multispectral satellites adopt multiple cameras to image different spectral bands to realize multispectral observation, but the weight and the cost of the whole satellite are increased, and the reliability of the whole satellite is reduced. In order to reduce emission cost and improve reliability, China CMODIS satellites adopt a single-camera multi-channel form to realize multispectral observation, but due to the limitation of an optical system form, large-field observation cannot be realized.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a common-caliber multi-channel wide-spectrum-band large-view-field imaging optical system, which meets the requirements of various platforms on target imaging, and provides the common-caliber multi-channel wide-spectrum-band large-view-field imaging optical system which has high angular resolution, large view field and wide coverage band and can realize the ultraviolet, visible light, medium wave infrared and long wave infrared imaging of a target.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a common aperture multi-channel wide-spectrum large-field-of-view imaging optical system, the system comprising: the device comprises a reflecting optical lens group, a semi-reflecting semi-permeable spectroscope, a beam splitter prism, a parallel flat lens group, an ultraviolet lens group, a visible light lens group, a medium wave infrared lens group and a long wave infrared lens group; the optical signal irradiates the reflecting optical lens group, is reflected by the main reflecting optical lens group and then enters the semi-reflecting and semi-transmitting spectroscope, and the semi-reflecting and semi-transmitting spectroscope divides the optical signal into two parts; a part of optical signals are split by the splitting prism, enter the ultraviolet lens group and the visible light lens group respectively, and are finally received by the ultraviolet band detector and the visible light band detector; the other part is split by a parallel flat lens set with a certain wedge angle, enters the medium wave infrared lens set and the long wave infrared lens set respectively, and is finally received by the medium wave infrared detector and the long wave infrared detector.
Preferably, the mirror optical group includes: a primary mirror and a secondary mirror; the primary mirror is of an annular structure, the primary mirror and the secondary mirror are coaxially arranged, and the distance between the primary mirror and the secondary mirror is 433 mm.
Preferably, the parallel flat mirror group consists of two flat mirrors which are arranged in parallel.
Preferably, the length of the optical system is less than 760 mm.
Preferably, the focal length of the ultraviolet lens group and the focal length of the visible light lens group are 5000 mm; the focal length of the medium wave infrared optical lens group is 800 mm; the focal length of the long-wave infrared optical lens group is 600 mm.
Preferably, the ultraviolet lens group and the visible light lens group are of a symmetrical structure.
The invention has the beneficial effects that: the distance between the primary mirror and the secondary mirror is 433mm, the length of the all-optical system is smaller than 760mm, the optical structure is very beneficial to the layout of the whole structure, and the secondary imaging structure can be changed into a secondary imaging structure by adjusting each branch according to engineering application at the rear end, so that the method has very important significance for inhibiting stray light. The two-dimensional scanning mirror realizes the scanning of a large field of view of 80 degrees multiplied by 80 degrees, and the design of rear-path light splitting realizes the multi-channel wide spectrum observation of ultraviolet, visible light, medium-wave infrared and long-wave infrared. The transfer function of each system reaches the diffraction limit, the average of the transfer functions of ultraviolet, visible light and medium wave infrared at the cut-off frequency of the detector is above 0.5, and the average of the transfer functions of long wave infrared is limited by the diffraction limit is above 0.25.
Drawings
FIG. 1 is a schematic structural diagram of a common-aperture multi-channel wide-spectrum wide-field imaging optical system.
FIG. 2 is a graph of the transfer function of ultraviolet band (0.25 μm to 0.4 μm).
FIG. 3 shows the transfer function of the visible light band (0.4 μm to 1.0 μm).
The transfer function of the medium wave infrared band of FIG. 4 is 3 μm to 5 μm.
FIG. 5 is a graph showing a long-wavelength infrared transfer function (8 μm to 12 μm).
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, a common-aperture multi-channel wide-spectrum large-field-of-view imaging optical system includes: a reflecting optical lens group, a semi-reflecting semi-permeable spectroscope, a beam splitter prism, a parallel flat lens group, an ultraviolet lens group (0.25-0.4 mu m), a visible light lens group (0.4-1.0 mu m), a medium wave infrared lens group (3-5 mu m) and a long wave infrared lens group (8-12 mu m); the light signal illuminates a reflective optical mirror assembly, wherein the reflective optical mirror assembly comprises: a ring-shaped primary mirror and a reflector; the optical signal is reflected to a reflecting surface 2 of the secondary mirror by a surface 1 of the primary mirror, then is reflected by the reflecting surface 2 of the secondary mirror, passes through a diaphragm formed by the annular primary mirror and then enters the semi-reflective semi-transparent spectroscope, and the semi-reflective semi-transparent spectroscope divides the optical signal into two parts which enter different channels to meet different focal lengths; a part of optical signals are split by the splitting prism, enter the ultraviolet lens group and the visible light lens group respectively, and are finally received by the ultraviolet band detector and the visible light band detector; the ultraviolet lens group and the visible light transmission group are in a symmetrical form, and the asymmetric aberration (mostly astigmatism) generated by the parallel flat plate light splitting is difficult to correct, so the ultraviolet lens group and the visible light transmission group adopt prisms for light splitting. In this embodiment, the ultraviolet lens group (0.25 μm to 0.4 μm) includes: lens 1, lens 2, lens 3, lens 4, and lens 5; the visible light lens group (0.4-1.0 μm) includes: lens 6, lens 7, lens 8, lens 9 and lens 10.
In order to avoid introducing ghost images, the other part of optical signals are split by a parallel flat lens group with a certain wedge angle, enter the medium-wave infrared lens group and the long-wave infrared lens group respectively, and are finally received by the medium-wave infrared detector and the long-wave infrared detector, wherein the exit pupil of the medium-wave infrared lens group needs to be matched with the cold diaphragm of the refrigeration type infrared detector, so that refocusing must be carried out through secondary imaging, and the parallel flat lens group consists of two flat lenses which are arranged in parallel. The medium wave infrared lens group (3-5 μm) comprises: lens 11, lens 12 and lens 13. The long-wave infrared lens group (8-12 μm) comprises: lens 14, lens 15, lens 16 and lens 17.
The specific design parameter index of the optical system is as follows
(1) Focal length:
(d theta is track height, a is detector pixel size)
The focal length of the ultraviolet lens group and the visible light lens group is 5000 mm;
the focal length of the medium wave infrared optical lens group is 800 mm;
the focal length of the long-wave infrared optical lens group is 600 mm;
(2) maximum field of view allowed in diagonal direction:
The minimum field of view in each optical branch is selected during design, namely 0.996 degrees, and 0.004 degrees of margin is reserved during design and is determined to be 1 degree.
(3) The aperture of the optical light-transmitting tube is 400mm
The following table shows specific parameters of each element in a common-aperture multi-channel wide-spectrum large-field-of-view imaging optical system.
Fig. 2-5 show that each channel reaches the diffraction limit at the nyquist frequency.
Claims (6)
1. A common-aperture multi-channel wide-spectrum-band large-field-of-view imaging optical system is characterized by comprising: the device comprises a reflecting optical lens group, a semi-reflecting semi-permeable spectroscope, a beam splitter prism, a parallel flat lens group, an ultraviolet lens group, a visible light lens group, a medium wave infrared lens group and a long wave infrared lens group; the optical signal irradiates the reflecting optical lens group, is reflected by the main reflecting optical lens group and then enters the semi-reflecting and semi-transmitting spectroscope, and the semi-reflecting and semi-transmitting spectroscope divides the optical signal into two parts; a part of optical signals are split by the splitting prism, enter the ultraviolet lens group and the visible light lens group respectively, and are finally received by the ultraviolet band detector and the visible light band detector; the other part is split by a parallel flat lens set with a certain wedge angle, enters the medium wave infrared lens set and the long wave infrared lens set respectively, and is finally received by the medium wave infrared detector and the long wave infrared detector.
2. The common-aperture multi-channel wide-spectrum large-field imaging optical system according to claim 1, wherein the reflection optical lens group comprises: a primary mirror and a secondary mirror; the primary mirror is of an annular structure, the primary mirror and the secondary mirror are coaxially arranged, and the distance between the primary mirror and the secondary mirror is 433 mm.
3. The common-aperture multi-channel wide-spectrum large-field imaging optical system according to claim 1, wherein the parallel flat-plate lens group is composed of two flat-plate lenses disposed in parallel with each other.
4. The common-aperture multi-channel wide-spectrum large-field imaging optical system as claimed in claim 1, wherein the length of the optical system is less than 760 mm.
5. The common-aperture multi-channel wide-spectrum large-field imaging optical system according to claim 1, wherein the focal length of the ultraviolet lens group and the visible lens group is 5000 mm; the focal length of the medium wave infrared optical lens group is 800 mm; the focal length of the long-wave infrared optical lens group is 600 mm.
6. The common-aperture multi-channel wide-spectrum large-field imaging optical system according to claim 1, wherein the ultraviolet lens group and the visible lens group are of symmetrical structures.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018834A (en) * | 2021-08-06 | 2022-02-08 | 中科联芯(广州)科技有限公司 | Intelligent target identification method and detection device for silicon-based multispectral signals |
| CN114660061A (en) * | 2022-03-10 | 2022-06-24 | 中国科学院长春光学精密机械与物理研究所 | Cloud cover state observation system |
| CN115077866A (en) * | 2022-05-26 | 2022-09-20 | 西北工业大学 | Multi-band infrared characteristic testing device and working method |
| CN116736514A (en) * | 2023-08-09 | 2023-09-12 | 中国科学院长春光学精密机械与物理研究所 | Multi-channel view field divider and application |
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| CN105182436A (en) * | 2015-09-07 | 2015-12-23 | 南京华图信息技术有限公司 | Device and method for cooperatively detecting moving target by using all-optical-waveband map |
| CN108801460A (en) * | 2018-08-20 | 2018-11-13 | 中国科学院上海技术物理研究所 | A kind of Shared aperture multichannel all band Hyperspectral imager |
| CN110031980A (en) * | 2019-04-04 | 2019-07-19 | 中国科学院光电技术研究所 | A kind of " spectrum structure of four photosynthetic one " |
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2020
- 2020-12-29 CN CN202011593616.6A patent/CN112578555A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105182436A (en) * | 2015-09-07 | 2015-12-23 | 南京华图信息技术有限公司 | Device and method for cooperatively detecting moving target by using all-optical-waveband map |
| CN108801460A (en) * | 2018-08-20 | 2018-11-13 | 中国科学院上海技术物理研究所 | A kind of Shared aperture multichannel all band Hyperspectral imager |
| CN110031980A (en) * | 2019-04-04 | 2019-07-19 | 中国科学院光电技术研究所 | A kind of " spectrum structure of four photosynthetic one " |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114018834A (en) * | 2021-08-06 | 2022-02-08 | 中科联芯(广州)科技有限公司 | Intelligent target identification method and detection device for silicon-based multispectral signals |
| CN114660061A (en) * | 2022-03-10 | 2022-06-24 | 中国科学院长春光学精密机械与物理研究所 | Cloud cover state observation system |
| CN115077866A (en) * | 2022-05-26 | 2022-09-20 | 西北工业大学 | Multi-band infrared characteristic testing device and working method |
| CN116736514A (en) * | 2023-08-09 | 2023-09-12 | 中国科学院长春光学精密机械与物理研究所 | Multi-channel view field divider and application |
| CN116736514B (en) * | 2023-08-09 | 2023-10-31 | 中国科学院长春光学精密机械与物理研究所 | Multi-channel view field divider and application |
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