CN103940742A - Integrated airborne large-visual-field high-spectrum imaging system based on composite Fery prisms - Google Patents
Integrated airborne large-visual-field high-spectrum imaging system based on composite Fery prisms Download PDFInfo
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- CN103940742A CN103940742A CN201410158368.0A CN201410158368A CN103940742A CN 103940742 A CN103940742 A CN 103940742A CN 201410158368 A CN201410158368 A CN 201410158368A CN 103940742 A CN103940742 A CN 103940742A
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Abstract
The invention discloses an integrated airborne large-visual-field high-spectrum imaging system based on composite Fery prisms, which comprises a preset lens, a first Offner relay imaging system and a second Offner relay imaging system, wherein the image surface of the preset lens is provided with a slit for uniformly distributing left and right visual fields; the first and second Offner relay imaging systems are respectively arranged on both sides of the preset lens, and respectively comprises a first and second reflecting mirrors, a composite Fery prism and an image surface; the slit at the image surface of the preset lens uniformly divides light rays into a left half visual field and a right half visual field; the light rays in the left half visual field and right half visual field respectively enter the first Offner relay imaging system and second Offner relay imaging system; and the incident rays sequentially pass through the first reflecting mirror, composite Fery prism and second reflecting mirror and arrives at the image surface. The volume and weight of the system are reduced, and the swath width of the system is increased.
Description
Technical field
The present invention relates to light spectrum image-forming technical field, relate in particular to the integrated airborne large visual field Hyperspectral imager based on compound F é ry prism.
Background technology
F é ry prism (being curved surface prism, is that the working face of conventional planar prism is processed as to sphere) is set forth in early in the twentieth century, starts to be applied to light spectrum image-forming technical field the nineties.F é ry prism is to be sphere two plane machinings of conventional prism, can obtain " pure spectrum ", and show that by theoretical research F é ry prismatic spectrum imager can directly be placed in non-parallel light path, thereby avoid the use of collimating mirror and imaging lens, reduce band curvature and Spectral line bend.
Existing Offner relay imaging system is made up of three spherical reflectors, and primary mirror, secondary mirror, three mirrors reflex to secondary mirror through primary mirror after light incident primary mirror, then are reflected to three mirrors by secondary mirror, finally image in image planes place, and whole system is a kind of symmetrical structure.
Visual field affects the remote sensing operating efficiency of airborne spectrum imaging system.The visual field of spectrum imaging system preset lens is subject to the restriction of optical design aspect, and obtaining the more method of the current employing of large swath width is the field stitching of many platform independent spectrum imaging system.This connection scheme causes system-wide volume excessive, can not meet spectrum imaging system miniaturization, light-weighted growth requirement.
Summary of the invention
The object of this invention is to provide a kind of integrated airborne large visual field Hyperspectral imager based on compound F é ry prism, reduce volume and weight, increased the swath width of system simultaneously.
The object of the invention is to be achieved through the following technical solutions:
An integrated airborne large visual field Hyperspectral imager based on compound F é ry prism, this system comprises: a preset lens, an Offner relay imaging system and the 2nd Offner relay imaging system;
Wherein, described preset lens image planes place is provided with the slit for mean allocation left and right fields of vision;
Described first and second Offner relay imaging system divides and is located at described preset lens both sides, includes: first and second catoptron, compound F é ry prism and image planes;
Light is equally divided into left half field-of-view and right half field-of-view by the slit at described preset lens image planes place; A corresponding Offner relay imaging system and the 2nd Offner relay imaging system of entering respectively; Incident ray reaches image planes through the first catoptron, compound F é ry prism, the second catoptron successively.
Further, the slit length at described preset lens image planes place is 49.86mm.
Further, described preset lens field angle is 28 °, and light is equally divided into left half field-of-view and right half field-of-view by slit;
Wherein, described left half field-of-view on direction of principal axis from 0.5 °, axle, in its swath direction-0.117 °～14 ° of first catoptrons that incide in an Offner relay imaging system;
Described right half field-of-view on direction of principal axis from axle-0.5 °, in 0.117 °～-14 ° the second catoptrons that incide in the 2nd Offner relay imaging system of its swath direction.
Further, described preset lens is telecentric beam path in image space, and its image space numerical aperture is 0.12;
Described first and second Offner relay imaging system is object space telecentric beam path, and its object space numerical aperture NA is 0.12.
As seen from the above technical solution provided by the invention, utilize splicing in the visual field of single preset lens and two optical spectrum imagers, adopt transmission-type system as preset lens and the improved F é ry prism relay system based on Offner secondary mirror as optical spectrum imagers, compared with splicing outside current conventional visual field, this compact conformation, lightweight, simplification, and can increase the swath width of system.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain other accompanying drawings according to these accompanying drawings.
The schematic diagram of a kind of integrated airborne large visual field Hyperspectral imager based on compound F é ry prism that Fig. 1 provides for the embodiment of the present invention one;
The schematic diagram of the compound F é ry prism Path of Convergent Rays principle that Fig. 2 provides for the embodiment of the present invention one.
The single preset lens Offner relay imaging system identical with two that Fig. 3 provides for the embodiment of the present invention one carries out the schematic diagram splicing in visual field
The side view that a kind of visual field that Fig. 4 a provides for the embodiment of the present invention one is cut apart;
The front elevation that a kind of visual field that Fig. 4 b provides for the embodiment of the present invention one is cut apart;
The schematic diagram of the MTF curve of the each visual field of left half field-of-view 450nm that Fig. 5 a provides for the embodiment of the present invention one;
The schematic diagram of the MTF curve of the each visual field of left half field-of-view 700nm that Fig. 5 b provides for the embodiment of the present invention one;
The schematic diagram of the MTF curve of the each visual field of left half field-of-view 1000nm that Fig. 5 c provides for the embodiment of the present invention one;
The schematic diagram of the MTF curve of the each visual field of right half field-of-view 450nm that Fig. 5 d provides for the embodiment of the present invention one;
The schematic diagram of the MTF curve of the each visual field of right half field-of-view 700nm that Fig. 5 e provides for the embodiment of the present invention one;
The schematic diagram of the MTF curve of the each visual field of right half field-of-view 1000nm that Fig. 5 f provides for the embodiment of the present invention one;
The schematic diagram that Fig. 6 a analyzes for the Spectral line bend that the embodiment of the present invention one provides;
The schematic diagram that Fig. 6 b analyzes for the band curvature that the embodiment of the present invention one provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on embodiments of the invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to protection scope of the present invention.
Embodiment mono-
The schematic diagram of a kind of integrated airborne large visual field Hyperspectral imager based on compound F é ry prism that Fig. 1 provides for the embodiment of the present invention one.As shown in Figure 1, this system comprises: a preset lens, an Offner relay imaging system and the 2nd Offner relay imaging system;
Wherein, described preset lens image planes place is provided with the slit for mean allocation left and right fields of vision;
Described first and second Offner relay imaging system divides and is located at described preset lens both sides, includes: first and second catoptron, compound F é ry prism and image planes;
Light is equally divided into left half field-of-view and right half field-of-view by the slit at described preset lens image planes place; A corresponding Offner relay imaging system and the 2nd Offner relay imaging system of entering respectively; Incident ray reaches image planes through the first catoptron, compound F é ry prism, the second catoptron successively.
Further, the slit length at described preset lens image planes place is 49.86mm.
Further, described preset lens field angle is 28 °, and light is equally divided into left half field-of-view and right half field-of-view by slit;
Wherein, described left half field-of-view on direction of principal axis from 0.5 °, axle, in its swath direction-0.117 °～14 ° of first catoptrons that incide in an Offner relay imaging system;
Described right half field-of-view on direction of principal axis from axle-0.5 °, in 0.117 °～-14 ° the second catoptrons that incide in the 2nd Offner relay imaging system of its swath direction.
Further, described preset lens is telecentric beam path in image space, and its image space numerical aperture is 0.12;
Described first and second Offner relay imaging system is object space telecentric beam path, and its object space numerical aperture NA is 0.12.
In Fig. 1, each Reference numeral is explained as follows: 1 is pre-objective, 2 is the catoptron (what first receive incident ray is the first catoptron) of an Offner relay imaging system, 3 is the catoptron (what first receive incident ray is the first catoptron) of the 2nd Offner relay imaging system, 4 is the compound F é ry prism of an Offner relay imaging system, 5 is the compound F é ry prism of the 2nd Offner relay imaging system, 6 is the image planes of the 2nd Offner relay imaging system, and 7 is the image planes of an Offner relay imaging system.
The parameter of described compound F é ry prism is as shown in table 1:
| Face | Radius/mm | Glass material | Thickness/mm | Around X-axis rotate/° |
| First surface | 146.8 | ZF10 | 6 | -2.2 |
| Cemented surface | 145.4 | ? | ? | 0.5 |
| Reflecting surface | 116.0 | SILICA | 15.6 | 3.2 |
The parameter of the compound F é of table 1 ry prism
Further, for the ease of understanding, below in conjunction with accompanying drawing 2-6, the present invention will be further described.
As shown in Figure 2, be the schematic diagram of compound F é ry prism Path of Convergent Rays principle in the embodiment of the present invention.The radius-of-curvature of logical optical surface before and after R1, R2 are respectively, S is the thing of incident R2 face, S1 is the picture of S through incident R2 face, S1 is also for reflecting the thing of R1 face simultaneously, S2 is the picture of S1 through reflection R1 face, S2 is also the thing of outgoing R2 face simultaneously, and S ' is the picture of outgoing R2 face, and i, i ' are respectively incident angle and refraction angle.
In the embodiment of the present invention, utilize the Offner relay imaging system that single preset lens is identical with two to carry out splicing in visual field.As shown in Figure 3, preset lens image planes place is provided with slit and (as shown in Fig. 4 a-Fig. 4 b, is respectively visual field and cuts apart side view and front elevation for cutting apart visual field.In figure, 1-2 represents slit, and 3 represent catoptron), airborne load height is 5km, the swath width of preset lens corresponding ground 2.493km, the slit length of corresponding 49.86mm.The slit length of two Offner relay imaging systems is 25.2mm, the overlapping 0.408mm in visual field, slit place, the overlapping 0.0204km in ground.
Preset lens field angle is 28 °, and linear field is equally assigned into left half field-of-view and right half field-of-view.Left half field-of-view on direction of principal axis from 0.5 °, axle, the catoptron of an Offner relay imaging system is incided in the swath direction-0.117 °～left half field-of-view of 14 °, dispersion approaches 1mm; Right half field-of-view on direction of principal axis from axle-0.5 °, the catoptron of Offner relay imaging system 2 is incided in the 0.117 °～right half field-of-view of-14 ° of swath direction, dispersion approaches 1mm.
For realizing pupil coupling, the image space numerical aperture NA of preset lens is that the object space numerical aperture NA of 0.12, Offner relay imaging system is 0.12, and preset lens is telecentric beam path in image space, and Offner relay imaging system is object space telecentric beam path.The adjustable catoptron of latter two angle of slit can freely be adjusted the position of Offner relay imaging system in total system.Offner relay imaging system pushes away forward to sweep and forms space dimension, and the dispersion of slit place forms spectrum dimension, and the flying height of load is 5km, and instantaneous field of view angle is 0.0068 °, and ground resolution is 0.6m, and total swath width is 2.493km.The ground swath that two Offner relay imaging systems receive respectively 1.2564km is wide.After acquisition pushes away the data of sweeping, splice and obtain complete 2.493km ground image by data.
As shown in Fig. 5 a-5f, the typical wavelengths of the integrated airborne large visual field Hyperspectral imager based on compound F é ry prism providing for the embodiment of the present invention is in the transport function of full visual field; Wherein, Fig. 5 a is the MTF(modulation transmission of the each visual field of left half field-of-view 450nm) curve; Fig. 5 b is the MTF curve of the each visual field of left half field-of-view 700nm; Fig. 5 c is the MTF curve of the each visual field of left half field-of-view 1000nm; Fig. 5 d is the MTF curve of the each visual field of right half field-of-view 450nm; Fig. 5 e is the MTF curve of the each visual field of right half field-of-view 700nm; Fig. 5 f is the MTF curve of the each visual field of right half field-of-view 1000nm.As can be seen from the figure, the image quality of each wavelength in resistance to Qwest frequency all approaches diffraction limit.
In the embodiment of the present invention, in system design process, can use Zemax software to design respectively preset lens and Offner relay imaging system, then use the large visual field of Zemax multiple configurational structure simulation Hyperspectral imager, finally simulation result be analyzed.
Fig. 6 a-Fig. 6 b is Spectral line bend and the band curvature analysis of system, and because the present invention is integrated design, Spectral line bend and band curvature are debug very large reference value for follow-up processing.Fig. 6 a: the corresponding Offner relay imaging system of left half field-of-view, slit length is 25.2mm, is made as visual field, slit center with 7 ° of visual fields.Corresponding the 2nd Offner relay imaging system of right half field-of-view, slit length is 25.2mm, is made as visual field, slit center with-7 ° of visual fields.Spectral line bend is approximate about slit Central Symmetry, and increases Spectral line bend change greatly with slit length, and the longer Spectral line bend of wavelength is larger, and when slit length 25.2mm, the Spectral line bend of maximum approaches 20% pixel.Fig. 6 b: band curvature is taking 650nm wavelength as benchmark, and band curvature is approximate in a center of symmetry with 650nm wavelength, and maximum band curvature is controlled in 20% pixel.
Compared with prior art, main tool has the following advantages the scheme of the above embodiment of the present invention:
1) a point visual field adopts single preset lens multispectral imaging instrument system, has economized a preset lens, and structure becomes compact lightweight, also can obtain large visual field simultaneously.
2) secondary mirror of Offner relay imaging system changes F é ry prism into, simple and compact for structure.
3) F é ry prism has been avoided the use of collimating mirror and imaging lens as dispersion element.
4) method that adopts achromatic prism to combine, suppresses the non-linear of prism dispersion.
5) design has adopted zemax(software when Hyperspectral imager) multiple configurational, band curvature and Spectral line bend control fine.
6) adopt integrated optimal design, improved the precision in system design process.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (4)
1. the integrated airborne large visual field Hyperspectral imager based on compound F é ry prism, is characterized in that, this system comprises: a preset lens, an Offner relay imaging system and the 2nd Offner relay imaging system;
Wherein, described preset lens image planes place is provided with the slit for mean allocation left and right fields of vision;
Described first and second Offner relay imaging system divides and is located at described preset lens both sides, includes: first and second catoptron, compound F é ry prism and image planes;
Light is equally divided into left half field-of-view and right half field-of-view by the slit at described preset lens image planes place; A corresponding Offner relay imaging system and the 2nd Offner relay imaging system of entering respectively; Incident ray reaches image planes through the first catoptron, compound F é ry prism, the second catoptron successively.
2. Hyperspectral imager according to claim 1, is characterized in that, the slit length at described preset lens image planes place is 49.86mm.
3. Hyperspectral imager according to claim 1, is characterized in that,
Described preset lens field angle is 28 °, and light is equally divided into left half field-of-view and right half field-of-view by slit;
Wherein, described left half field-of-view on direction of principal axis from 0.5 °, axle, in its swath direction-0.117 °～14 ° of first catoptrons that incide in an Offner relay imaging system;
Described right half field-of-view on direction of principal axis from axle-0.5 °, in 0.117 °～-14 ° the second catoptrons that incide in the 2nd Offner relay imaging system of its swath direction.
4. Hyperspectral imager according to claim 1, is characterized in that,
Described preset lens is telecentric beam path in image space, and its image space numerical aperture is 0.12;
Described first and second Offner relay imaging system is object space telecentric beam path, and its object space numerical aperture NA is 0.12.
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Cited By (3)
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| CN105067119A (en) * | 2015-08-21 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | Vision field division interference imaging spectrometer and imaging method |
| CN108981914A (en) * | 2018-05-22 | 2018-12-11 | 中国电子科技集团公司第四十研究所 | Offner two-channel structure imaging spectrometer and method |
| CN112711126A (en) * | 2020-12-31 | 2021-04-27 | 中国科学院长春光学精密机械与物理研究所 | Optical splicing imaging device |
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Cited By (3)
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| CN105067119A (en) * | 2015-08-21 | 2015-11-18 | 中国科学院西安光学精密机械研究所 | Vision field division interference imaging spectrometer and imaging method |
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| CN112711126A (en) * | 2020-12-31 | 2021-04-27 | 中国科学院长春光学精密机械与物理研究所 | Optical splicing imaging device |
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