CN208688660U - Shared aperture multichannel all band Hyperspectral imager - Google Patents
Shared aperture multichannel all band Hyperspectral imager Download PDFInfo
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Abstract
This patent discloses a kind of Shared aperture multichannel all band Hyperspectral imagers, using secondary visual field partition method, a visual field separation is realized by the way that visual field separator on axis is arranged on principal reflection mirror and the intermediate image plane of secondary mirror formation, the light of different visual fields is subjected to separation and forms 2 visual field channels, off-axis visual field separator, which is reflexed to, through three reflecting mirrors again realizes that secondary visual field separates, the light of different visual fields is subjected to separation again and forms 6 visual field channels, more sufficient arrangement space is provided for the docking of multiple spectrometer moduleizations, breaching traditional light-splitting device cannot achieve the limitation of all band high-diffraction efficiency light splitting, meets the needs of all band Hyperspectral imager；System heavy caliber design easy to accomplish, carries out big view field imaging, and compact-sized, is advantageously implemented the small light of all band EO-1 hyperion load design.
Description
Technical field
This patent is related to remotely sensed image technology, in particular to a kind of Shared aperture multichannel all band Hyperspectral imager,
It can be applied to airborne or spaceborne multiband, all band EO-1 hyperion Imaging: Monitoring over the ground.
Background technique
High light spectrum image-forming technology is the remote sensing technology to grow up the eighties, unlike traditional spectrometer, bloom
Spectral imaging technology is to integrate imaging and spectrum (collection of illustrative plates), with nanoscale high spectral resolution, is obtaining target two dimension
While spatial image information, the synchronous continuous fine spectral information for obtaining target mentions the detectivity of space remote sensing greatly
Height can be widely applied in the observation such as land, atmosphere, ocean.
Typical case's Hyperspectral imager mainly has Hyperion (the wave band model of the U.S.'s EO-1 Seeds of First Post-flight emitted at present
Enclose is 0.4~2.5 μm), CHRIS (wavelength band is 0.4~1.05 μm), the U.S. MRO of European Space Agency's PROBA-1 Seeds of First Post-flight defend
The PRISM of the Italy for CRISM (wavelength band is 0.4~4.05 μm) He Yan that star carries is (it is expected that transmitting in 2018, wave band
Range is 0.4~2.5 μm), the EnMAP/HIS (it is expected that 2018 emit, wavelength band is 0.42~2.45 μm) of Germany, plus take
The HyspIRI of big Hero (it is expected that the year two thousand twenty emits, wavelength band is 0.42~2.45 μm), the U.S. are (it is expected that 2023 transmittings, wave
Segment limit is 0.38~2.5 μm), domestic Hyperspectral imager mainly has the EO-1 hyperion of the HJ-1A Seeds of First Post-flight emitted
Imager (wavelength band be 0.45~1.05 μm), Spark-01&02 Seeds of First Post-flight hyperspectral imager (wavelength band is
0.42~1.0 μm).It can be seen that having put into application at this stage and only covered in the Hyperspectral imager wavelength band ground
Visible/near infrared and short-wave infrared, can not obtain in long wave band range spectral information.
In recent years, remote sensing has obtained development at full speed, and high-spectrum remote-sensing is imaged load and identifies in target signature
Aspect embodies unique advantage, in earth resource exploration, environment disaster reduction, urban planning, geographical mapping, agricultural resource investigation etc.
The effect in field is more and more prominent.But in view of difference existing for reflectivity and emissivity of the different target to each wave band electromagnetic wave
And the diversification that all types of user requires the spectral information of target, the high light spectrum image-forming of single wave band has been difficult to meet various
The use demand of various kinds.In this context, to covering 0.3 μm~16 μm it is ultraviolet to the infrared multiband of very long wave even all band without
Interval high light spectrum image-forming detection system proposes urgent demand.
Traditional multi-spectral imaging system is that more set single band optical systems are stitched together to realize multi-spectral imaging, is claimed
Be distributed imaging systems, but since structural volume is huge, it is difficult to realize miniaturization, mobility is poor, therefore very
Its application field is limited in big degree.In order to meet increasingly complicated application environment, multiband Shared aperture imaging system is just answered
It transports and gives birth to.
Common multiband Shared aperture imaging system mainly includes shared main optical structure, beam splitter and discrete postposition
Optical path three parts composition, wherein main optical structure is there are many implementation, including Cassegrain's formula, off-axis three trans- or simple
One group of lens etc.；Beam splitter includes prism, parallel flat etc.；Postposition optical path can generally be rung by multiple individual camera lenses are additional
The detector of different-waveband is answered to form spectrometer module.The multi-spectral imaging optical system of early stage is to share a main optical system
System, it will be seen that and infrared light path is incorporated into inside a channel, realizes that visible and infrared light path is divided using light-splitting device.But by
It is limited to the limitation that current light-splitting device cannot achieve the light splitting of all band high-diffraction efficiency, so all band imaging system needs pass through
Multiband light spectrometer modularized design, thus to realize 0.3 μm~16 μm it is ultraviolet to very long wave infrared full-wave section without interval bloom
Imaging detection is composed, spectrometer at least needs to be divided into: full color spectrometer module, UV, visible light near infrared spectrometer module, shortwave are red
6 external spectrum instrument module, medium-wave infrared spectrometer module, LONG WAVE INFRARED spectrometer module and LONG WAVE INFRARED spectrometer module moulds
Block.But existing main optical structure can arrangement space it is small, be unable to satisfy the requirement of multispectral instrument module docking, i.e. all-wave root module
Changing bloom spectrometer cannot achieve engineering application layout, and therefore, it is small how to break through main optical topology layout space, light-splitting device without
Method realizes the limitation of all band high-diffraction efficiency light splitting, realizes all band high light spectrum image-forming, is current urgently to be resolved both at home and abroad
One big technical problem.
Summary of the invention
This patent proposes a kind of Shared aperture multichannel all band Hyperspectral imager, it is therefore intended that solves complete at this stage
Main optical topology layout space present in the engineering realization of wave band EO-1 hyperion is small, is unable to satisfy asking for multispectral instrument module docking
Topic, using secondary visual field partition method, by the way that visual field point on axis is arranged on principal reflection mirror and the intermediate image plane of secondary mirror formation
A visual field separation is realized from device, and the light of different visual fields is subjected to separation and forms 2 visual field channels, then is reflected through three reflecting mirrors
Secondary visual field separation is realized to off-axis visual field separator, and the light of different visual fields is subjected to separation again and forms 6 visual field channels,
More sufficient arrangement space is provided for the docking of multiple spectrometer moduleizations, breaching light-splitting device cannot achieve all band height
The limitation of diffraction efficiency light splitting, meets the needs of all band Hyperspectral imager.And design example is combined to confirm the system
Feasibility, this to all band high light spectrum image-forming detection realization have Important Project application value.
This patent uses following technical scheme thus:
A kind of Shared aperture multichannel all band Hyperspectral imager, as shown in Figure 1, comprising:
Principal reflection mirror 1, secondary mirror 2, the one or three reflecting mirror 3, the two or three reflecting mirror 4, visual field separator first is flat on axis
The second plane of visual field separator transmitting mirror 6, first off-axis the first plane mirror of visual field separator 7, on face reflecting mirror 5, axis
One off-axis visual field separator second plane mirror 8, second off-axis the first plane mirror of visual field separator 9, second regard off axis
Field separator second plane mirror 10 and spectrometer；One or the three reflecting mirror 3-1 and the two or three reflecting mirror 3-2 is inclined in
The two sides for the image planes that principal reflection mirror 1 and secondary mirror 2 are formed, on the axis on the first plane mirror of visual field separator 5 and axis
In the intermediate image plane that the second plane of visual field separator transmitting mirror 6 is located at principal reflection mirror 1 and secondary mirror 2 is formed；Described first from
The first plane mirror of axis visual field separator 7 and the first off-axis visual field separator second plane mirror 8 are located at the one or three reflection
Before the final image planes that mirror 3 is formed, second off-axis the first plane mirror of visual field separator 9, the second off-axis visual field separator the
Two plane mirrors 10 are located at before the final image planes of the two or three reflecting mirror 4 formation；
Light from object space carries out on an optically focused back reflection to secondary mirror 2 through principal reflection mirror 1, and secondary mirror 2 will
Incident ray reflexes to visual field separator on the axis in intermediate image plane and separates different light to different visual field channels, wherein
The ultraviolet light to short-wave infrared reflexes to the one or three reflecting mirror 3, medium wave by the first plane mirror of visual field separator 5 on axis
Visual field separator second plane mirror 6 reflexes to the two or three reflecting mirror 4 on to the light warp beam of LONG WAVE INFRARED；One or three anti-mirror
The ultraviolet light to short-wave infrared is reflexed to the first off-axis visual field separator for panchromatic light, UV, visible light near-infrared and shortwave by 3
Light separate to different visual field channels, wherein UV, visible light near infrared light is flat by the first off-axis visual field separator first
Face reflecting mirror 7 is reflected into UV, visible light near infrared spectrometer 11, and shortwave light is flat by the first off-axis visual field separator second
Face reflecting mirror 8 is reflected into short-wave infrared spectrometer 12, and panchromatic light is anti-through first off-axis the first plane of visual field separator
The slit for penetrating mirror 7 and the first off-axis composition of visual field separator second plane mirror 8 enters visible and near infrared spectrum instrument 13；Second
The light of medium wave to LONG WAVE INFRARED is reflexed to the second off-axis visual field separator for medium wave, the light of middle long wave and long wave by three anti-mirrors 4
Line is separated to different visual field channels, and medium wave light is reflected by second off-axis the first plane mirror of visual field separator 9
Medium wave spectrometer 14, long wave light are reflected into LONG WAVE INFRARED light by the second off-axis visual field separator second plane mirror 10
Spectrometer 15, middle long wave light is through second off-axis the first plane mirror of visual field separator 9 and the second off-axis visual field separator the
LONG WAVE INFRARED spectrometer 16 in the slit entrance of two plane mirrors 10 composition；Formed Shared aperture multichannel all band EO-1 hyperion at
As system.
Wherein, the principal reflection mirror 1 is recessed axis non-spherical reflector.
Wherein, the secondary mirror 2 is the quadric convex reflector of standard.
Wherein, the one or three reflecting mirror 3 and the two or three reflecting mirror 4 are non-spherical reflector.
The advantages of optical system of this patent, is:
1) separation of visual field large-spacing is realized by visual field secondary separation, is provided for multiple spectrometer modules imaging relaying
Enough arrangement spaces；
2) optics Shared aperture designs, compact-sized, is advantageously implemented all band load design small light, can guarantee simultaneously
All band imaging detection has consistent resolution capability；
3) system opposite heavy caliber easy to accomplish designs, and helps that system light collecting light ability is substantially improved；
4) it is directed to existing bloom spectrum loading Development Level, provides one kind for all band high light spectrum image-forming load Project Realization
Novel solution.
Detailed description of the invention
Fig. 1 is a kind of Shared aperture multichannel all band Hyperspectral imager structural schematic diagram of this patent.
Specific embodiment
In order to keep the objects, features and advantages of this patent more clear, with reference to the accompanying drawings and embodiments, to this patent
A kind of specific embodiment make more detailed description, but this patent can be to be much different from the other way of description
Implement, therefore, this patent is not limited by the specific embodiment of following discloses.
Shared aperture multi channel imaging system based on the separation of secondary visual field according to this patent devises a set of spaceborne
Push-broom type is ultraviolet to very long wave infrared high spectrum imaging instrument system, and image quality is close to diffraction limit, it is contemplated that spectrometer and main optical
Respectively modularization ideal image module only can realize the system integration by simply docking, so example index is only listed
Primary optical system design objective, particular technique index are as follows:
Orbit altitude: 500km
Spectral region: panchromatic 0.45 μm~0.8 μm；0.3 μm~0.9 μm of UV, visible light near-infrared；0.9 μm of short-wave infrared~
3.0μm；3.0 μm~5.5 μm of medium-wave infrared；5.5 μm~12.0 μm of middle LONG WAVE INFRARED；12.0 μm~16.0 μm of LONG WAVE INFRARED
Telescope clear aperture: 450mm
Relative aperture: 1:3.47
Focal length: 1562.5mm
It pushes away and sweeps field: ± 0.6 °
Specific design parameter is as shown in table 1.
Table 1
D1: distance of the principal reflection mirror (1) apart from secondary mirror (2)；
D2: distance of the secondary mirror (2) to the first plane mirror of visual field separator (5) on axis；
D3: distance of the secondary mirror (2) to visual field separator second plane mirror (6) on axis；
D4: distance of the first plane mirror of visual field separator (5) to the one or three reflecting mirror (3) on axis；
D5: distance of the visual field separator second plane mirror (6) to the two or three reflecting mirror (4) on axis；
The distance of d6: the one three reflecting mirror (3) to first off-axis the first plane mirror of visual field separator (7)；
The distance of d7: the two three reflecting mirror (4) to the first off-axis visual field separator second plane mirror (8)；
The distance of d8: the one three reflecting mirror (3) to second off-axis the first plane mirror of visual field separator (9)；
The distance of d9: the two three reflecting mirror (4) to the second off-axis visual field separator second plane mirror (10)；
R1: the radius of curvature of primary mirror (1)；
R2: the radius of curvature of secondary mirror (2)；
The radius of curvature of R3: the one three reflecting mirror (3)；
The radius of curvature of R4: the two three reflecting mirror (4)；
The spectrometer index of selection is as follows:
Show image quality of each wavelength within nyquist frequency close to diffraction pole by the simulation experiment result
Limit.
The foregoing is merely the preferred embodiments of this patent, not to limit this patent, all essences in this patent
Made any modifications, equivalent replacements, and improvements etc., should be included within the protection scope of this patent within mind and principle.
Claims (4)
1. a kind of Shared aperture multichannel all band Hyperspectral imager, including principal reflection mirror (1), secondary mirror (2), the one or three
Reflecting mirror (3), the two or three reflecting mirror (4), the first plane mirror of visual field separator (5) on axis, visual field separator second on axis
Plane transmitting mirror (6), first off-axis the first plane mirror of visual field separator (7), first off-axis the second plane of visual field separator
Reflecting mirror (8), second off-axis the first plane mirror of visual field separator (9), second off-axis the second plane reflection of visual field separator
Mirror (10) and spectrometer；It is characterized in that,
One or three reflecting mirror (3) and the two or three reflecting mirror (4) are inclined in what principal reflection mirror (1) and secondary mirror (2) were formed
The two sides of image planes, visual field separator the second plane transmitting mirror on the first plane mirror of visual field separator (5) and axis on the axis
(6) it is located in the intermediate image plane of principal reflection mirror (1) and secondary mirror (2) formation；The first off-axis visual field separator first is flat
Face reflecting mirror (7) and the first off-axis visual field separator second plane mirror (8) are located at the final of the one or three reflecting mirror (3) formation
Before image planes, second off-axis the first plane mirror of visual field separator (9), the second off-axis visual field separator second plane mirror
(10) it is located at before the final image planes that the two or three reflecting mirror (4) is formed；
Light from object space carries out on an optically focused back reflection to secondary mirror (2) through principal reflection mirror (1), secondary mirror (2)
Incident ray is reflexed on the axis in intermediate image plane visual field separator to separate different light to different visual field channels,
In the ultraviolet light to short-wave infrared by the first plane mirror of visual field separator (5) on axis reflex to the one or three reflecting mirror
(3), visual field separator second plane mirror (6) reflexes to the two or three reflecting mirror on medium wave to the light warp beam of LONG WAVE INFRARED
(4)；The ultraviolet light to short-wave infrared is reflexed to the first off-axis visual field separator for panchromatic light, ultraviolet by the one or three anti-mirror (3)
Visible near-infrared to be separated with the light of shortwave to different visual field channels, wherein UV, visible light near infrared light is off-axis by first
The first plane mirror of visual field separator (7) is reflected into UV, visible light near infrared spectrometer (11), and shortwave light passes through first
Off-axis visual field separator second plane mirror (8) is reflected into short-wave infrared spectrometer (12), and panchromatic light penetrates first
Off-axis visual field the first plane mirror of separator (7) and the first off-axis visual field separator second plane mirror (8) form narrow
Seam enters visible and near infrared spectrum instrument (13)；The light of medium wave to LONG WAVE INFRARED is reflexed to second off axis by the two or three anti-mirror (4)
Visual field separator separates the light of medium wave, middle long wave and long wave to different visual field channels, and medium wave light is off-axis by second
The first plane mirror of visual field separator (9) is reflected into medium wave spectrometer (14), and long wave light is by the second off-axis visual field point
It is reflected into LONG WAVE INFRARED spectrometer (15) from device second plane mirror (10), middle long wave light is through the second off-axis visual field point
It is long in slit entrance from the first plane mirror of device (9) and the second off-axis visual field separator second plane mirror (10) composition
Wave infrared spectrometer (16)；Form Shared aperture multichannel all band Hyperspectral imager.
2. a kind of Shared aperture multichannel all band Hyperspectral imager according to claim 1, which is characterized in that described
Principal reflection mirror (1) be recessed off-axis aspheric surface reflecting mirror.
3. a kind of Shared aperture multichannel all band Hyperspectral imager according to claim 1, which is characterized in that described
Secondary mirror (2) be the quadric convex reflector of standard.
4. a kind of Shared aperture multichannel all band Hyperspectral imager according to claim 1, which is characterized in that described
The one or three reflecting mirror (3) and the two or three reflecting mirror (4) be non-spherical reflector.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108801460B (en) * | 2018-08-20 | 2023-07-04 | 中国科学院上海技术物理研究所 | Common-caliber multi-channel full-band hyperspectral imaging system |
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