CN101216595A - Minisized hyper-spectral image-forming system - Google Patents
Minisized hyper-spectral image-forming system Download PDFInfo
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- CN101216595A CN101216595A CNA200710302608XA CN200710302608A CN101216595A CN 101216595 A CN101216595 A CN 101216595A CN A200710302608X A CNA200710302608X A CN A200710302608XA CN 200710302608 A CN200710302608 A CN 200710302608A CN 101216595 A CN101216595 A CN 101216595A
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Abstract
The invention relates to an optical system used for optical imaging and fine spectral analysis, in particular to a spectral imaging system integrated with imaging and spectroscopic techniques, which is composed of three coaxial and homocentric spherical optical elements including a primary mirror, a convex spherical holographic grating and a three-axis. By adopting a full-reflection symmetric structure, the invention has small geometric aberration, the object and the image sides satisfy telecentric bean path, and a receiver has uniform surface illumination. In order to ensure the coaxiality, the concentricity and the stability after long-term use, the invention subjects the optical system to modularization design by cementing two pieces of common glass containing identical materials, thus greatly lowering the production cost. Accordingly, the spectral imaging system has the advantages of good image quality, simple processing and assembly, small size, good stability, high spectral resolution, low cost and good portability, and is applicable to aerospace field, biomedical field or civilian hyperspectral imager such as banknote detector.
Description
Technical field
The present invention relates to a kind of optical system that is used for optical imagery and meticulous spectral analysis, particularly a kind of integrated picture and light splitting technology are in the imaging spectrometer of one.
Background technology
People have had nearly sesquicentennial history to the research of spectral instrument, create first spectrograph so far from kirchhoff in 1859 and Ben Sheng, and three phases has roughly been experienced in the development of spectral instrument.The birth of first spectral instrument is the spectral instrument beginning of development phase one, and this stage mainly is that spectrum is carried out qualitative analysis, and groundwork is a basic pattern of having developed the dispersion system that used afterwards in the spectral instrument of laboratory.The development of subordinate phase starts from the 1830's, the experience that begins to accumulate in the laboratory applies among industrial sector and the geologic prospecting, has createed quantitative spectrochemical analysis is used under laboratory, factory and field condition mass-producted spectral instrument and device.The characteristics of phase III spectral instrument are the optimizations of measuring robotization and requiring according to special use, requirement to each parts of instrument, begin till the self-recorder from illumination section, select to such an extent that make whole instrument and the fine adaptation of task that is proposed, carry out the calculating of spectral instrument characteristic according to information theory simultaneously.
In recent years, along with the enhancing of various countries' economy, military strength, people more and more pay close attention to and pay attention to research to fields such as space flight, biology and medical science, and light spectrum image-forming is a kind of novel optical imaging system that thereupon grows up.It can be used for obtaining the 3-D view that comprises two-dimensional space information and one dimension spectral information.For detection of a target structure and variation thereof, have special recognition capability, be applicable to satellites such as military affairs, civilian, land, ocean, can provide a large amount of remote sensing images for different user.Have the meaning of particular importance for Military Application, can be used for the identification camouflage, detect chemical weapons, submarine and dangerous object detection etc. under water; Also can be used for environment, ecology, crop, analysis of go out evil, geology, resource, atmosphere etc., classification, forecast assessment etc.
Ultra-optical spectrum imaging system not only plays requisite vital role in fields such as space flight, military affairs, and the application in many important civil areas is constantly expansion also.And the ultra-optical spectrum imaging system of being introduced in the present existing report, the general reflecting system that all adopts from axle, this type systematic requires the height except the processing of face shape, the plated film to catoptron, most critical be that debuging with test process of total system is very complicated, the small skew of each piece catoptron and the eccentric picture element that all can give system bring and seriously influence.Be machined to out a new product from being designed into, need quite long one-period, price is also very expensive, and this obviously is not suitable for military urgent need, also is not suitable for civil area.Civil area primary demand amount is big, wish to go out very soon product after client's proposition demand.Therefore, development picture element good, easy processing, the imaging spectrometer that volume is little, stability is high, spectral resolution is high, cost is low is very urgent and be with a wide range of applications.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, good, the easy processing of a kind of picture element, the ultra-optical spectrum imaging system that volume is little, stability is high, spectral resolution is high, cost is low are provided.
For achieving the above object, the technical solution used in the present invention is: a kind of minisized hyper-spectral image-forming system, and it is made up of primary mirror, grating and three mirrors, and wherein, primary mirror and three mirrors are spherical reflector, and grating is protruding sphere straight-line groove holographic grating, and they are coaxial with one heart; Press the light incident direction, the span during with respect to lens focus normalization is :-0.25≤R
2≤-0.2 ,-0.15≤R
3≤-0.1 and-0.25≤R
4≤-0.2, wherein, radius of curvature R
2, R
3, R
4Be followed successively by primary mirror, grating and three mirrors; System satisfies thing, as Fang Yuanxin.
Described primary mirror is identical with the radius-of-curvature of three mirrors, and the radius-of-curvature of grating is their 1/2nd.
Described grating surface peak is positioned on the optical axis, and the distance between it and primary mirror, 3 vertex points is 1/2nd of their radius-of-curvature.Described grating constant is that every millimeter 400～450 line is right.
Described primary mirror, grating and three mirrors are integrated in the optical glass substrate that two gummeds form, and wherein, the rear surface of a last optical glass substrate and a back optical glass substrate is protruding sphere, and the front surface of a back optical glass substrate is a concave spherical surface; Primary mirror is positioned at the top of the rear surface of a back optical glass substrate, and three mirrors are positioned at the below of the rear surface of a back optical glass substrate, and primary mirror and three mirrors constitute by the rear surface corresponding site plating highly reflecting films of a back optical glass substrate; Grating is positioned at the protruding sphere centre position of last optical glass substrate rear surface, and its surperficial peak is positioned on the optical axis.
The span of the refractive index n of described optical glass substrate is: 1≤n≤2.
Because the technique scheme utilization, the advantage that the present invention compared with prior art has is:
Imaging spectrum system bulking value ultralight is little, meets space flight with the light little requirement of useful load; With ordinary optical glass system is carried out modular design, make system stability be guaranteed, simultaneously, its production cost also reduces greatly, is suitable for producing in batches, is applicable to the equipment of the imaging spectral resolution techniques being had relatively high expectations as cash inspecting machine etc.; System adopts the concentric symmetrical structure of total reflection, and geometrical aberration is little, and thing, satisfies telecentric beam path as Fang Jun, and receiving device surface illumination is even.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention one described optical system;
Fig. 2 is the light path synoptic diagram of the embodiment of the invention one described optical system;
Fig. 3 is the ray tracing point range figure of the embodiment of the invention one described optical system;
Fig. 4 is the distortion curve figure of the embodiment of the invention one described optical system;
Fig. 5 is the curvature of field/astigmatism curve map of the embodiment of the invention one described optical system;
Fig. 6 embodiment of the invention one described optical system encircled energy curve map;
Fig. 7 is that the embodiment of the invention one described optical system is at the lip-deep relative irradiance distribution curve map of receiving device;
Fig. 8 is the embodiment of the invention one a described modulation transfer function of optical system curve.
Wherein: 1 is entrance slit; 2 is primary mirror; 3 is grating; 4 is three mirrors; 5 is receiver plane (as the plane); 6 is the cemented surface of two optical glass substrates; 7 is the rear surface of optical glass substrate; 8 are optical axis (being axis of symmetry); 9 is incident ray direction chief ray; 10,11 and 12 is the imaging beam picture side chief ray of different wave length; 13 is last optical glass substrate; 14 is a back optical glass substrate; The O point is the center of curvature of primary mirror, grating and three mirrors.
Embodiment
Below in conjunction with drawings and Examples specific embodiments of the present invention is further elaborated.
Embodiment one:
Fig. 1 is the structural representation of present embodiment optical system, and the F of system counts F/No.=2.6, and operation wavelength is in visible-range.
Referring to accompanying drawing 1, spectrum imaging system is made up of primary mirror 2, grating 3 and three mirrors 4, be the stability after the right alignment, proper alignment and the use over a long time that guarantee system, the present invention adopts optical system is carried out modular design, the system integration is in the optical glass substrate 13 and 14 that two gummeds form, and 6 is the cemented surface of two optical glass substrates, wherein, the rear surface of a last optical glass substrate 13 and a back optical glass substrate 14 is protruding sphere, and the front surface of substrate of glass 14 is a concave spherical surface; Entrance slit 1 is one 1500 * 100 microns a rectangle, be positioned at the front surface top of substrate of glass 13, receiver plane (as the plane) 5 is positioned at the front surface below of substrate of glass, primary mirror and three mirrors are made of the upper and lower corresponding site plating highly reflecting films of the rear surface 7 of substrate of glass 14, grating is positioned at the protruding sphere centre position of substrate of glass 13, its surperficial peak is positioned on the optical axis 8, and it is coaxial concentric with primary mirror, three mirrors, the center of curvature is the O point, and whole device is that a size is less than 30 * 30 * 30mm
3Cube.
In the spectrum imaging system, primary mirror and three mirrors are spherical reflector, grating is protruding sphere straight-line groove holographic grating, this optical system have related parameter as follows: focal length 105mm, primary mirror is identical with the radius-of-curvature of three mirrors, and the radius-of-curvature of grating is their 1/2nd, and promptly the primary mirror radius-of-curvature is-25mm, the grating radius-of-curvature is-12.5mm that three curvature radius are-25mm; Radius-of-curvature during with respect to lens focus normalization respectively is R
2=-0.238, R
3=-0.119, R
4=-0.238; Four intervals are respectively in order: the spacing 25mm of slit and primary mirror, the spacing-12.5mm of primary mirror and grating, the interval 12.5mm of grating and three mirrors, the interval-25mm of three mirrors and image planes.Grating constant is 400lp/mm, and the material refractive index of two substrate of glass is 1.5.
Fig. 2 is the light path synoptic diagram of present embodiment optical system, and its light path design is based on the Offner relay system, and incident ray direction chief ray 9 is parallel to optical axis 8, forms the object space heart far away; The imaging beam picture side chief ray 10,11 and 12 of different wave length all is parallel to optical axis, the shape imaging side heart far away, and Illumination Distribution is even on (as the plane) 5, receiver plane.Among the figure, entrance slit 1 be front-end system by spectroscopic system to object imaging (front-end system does not specifically provide), object at the picture at slit place through spectroscopic system, at last with 1: 1 one-tenth to the receiver plane, the picture of different wave length is evenly distributed on it.Press the light incident direction, arrive primary mirror 2 from entrance slit, converge to protruding sphere straight-line groove holographic grating 3 by primary mirror, grating is dispersed convergent beam and with the light of different wave length separately again, light beam after this grating separates arrives three mirrors 4, by three mirrors the light of different wave length is converged to the receiver plane surface respectively, the picture with different spectrum when having realized imaging in 1: 1 separates.
Referring to accompanying drawing 3, it is the ray tracing point range figure that light passes through the described optical system of present embodiment, be in situation about receiving on the plane after the entrance slit process spectrometer spectroscopic imaging, several different wave lengths are at the circle expression Airy at place, different visual field spot among Fig. 3, as seen from the figure, the point range figure at each place, visual field of different wave length all drops in the Airy spot on the image planes, shows that this optical system has the focus characteristics of the diffraction theory limit.
The described optical system distortion of present embodiment is represented as shown in Figure 4 with grid map, among the figure, mesh node is the ideal image point position, spider is represented actual imaging point position, the distortion of present embodiment optical system (number percent that departs from the ideal image point position of actual image point and ideal image point) maximal value is 0.1078%, the distortion requirement when its distortion value is satisfied with spectral analysis fully.
Referring to accompanying drawing 5, it is the curvature of field, the astigmatism curve map of this enforcement camera lens, and horizontal ordinate is represented curvature of field astigmatism value, and ordinate is the normalization visual field, two curve S among the figure and T represent the curvature of field in the sagitta of arc and two faces of meridian respectively, and the difference between two curves is the astigmatism value.Because singularity of the present invention, entrance slit (being the visual field of imaging spectrometer) is the rectangular strip of a bidimensional, figure A and figure B provided respectively along on the rectangle both direction at the curvature of field, astigmatism curve, as seen from the figure, the astigmatism value is in the tolerance for aberration scope.
Referring to accompanying drawing 6, it is the encircled energy curve of the described optical system of present embodiment, and as seen from Figure 6, the concentration of energy more than 80% is in Airy spot scope.
Referring to accompanying drawing 7, it be the described optical system of present embodiment at the lip-deep relative irradiance distribution curve map of receiving device because system satisfies picture Fang Yuanxin, from figure curve as can be seen, illuminance of image plane distributes very even, edge illumination is without any decline.
Referring to accompanying drawing 8, it is the modulation transfer function curve of the described optical system of present embodiment, and as seen from the figure, this optical system has the imaging performance of diffraction limit.
In the optical system that present embodiment provided, primary mirror and three mirrors do up converging action to imaging, it rises grating pair and disperses and divide light action, system satisfies thing, as the characteristics of Fang Yuanxin, the optical system that is used for optical imagery and meticulous spectral analysis, it is that a kind of integrated picture and light splitting technology are in the imaging spectrum system of one.
Embodiment two:
In the present embodiment, system architecture is referring to embodiment 1, and F counts F/No.=2.5, and operation wavelength is in visible-range.
All the other parameters of optical system are as follows: entrance slit is one 2000 * 200 microns a rectangle, and grating constant is 420lp/mm, and glass materials refractive index is 1.6.System's focal length is 115mm, and the radius-of-curvature of primary mirror is-27mm that the radius-of-curvature of grating is-13.5mm that the radius-of-curvature of three mirrors is-27mm that the radius-of-curvature during with respect to lens focus normalization is respectively R
2=-0.235, R
3=-0.117 and R
4=-0.235.Slit 1 is 27mm with the spacing of primary mirror 2, and primary mirror 2 with the spacing of grating 3 be-13.5mm, grating 3 and three mirrors 4 be spaced apart 13.5mm, being spaced apart-27mm of three mirrors 4 and image planes 5.
Claims (6)
1. minisized hyper-spectral image-forming system, it is characterized in that: it is made up of primary mirror, grating and three mirrors, and wherein, primary mirror and three mirrors are spherical reflector, and grating is protruding sphere straight-line groove holographic grating, and they are coaxial with one heart; Press the light incident direction, the span during with respect to lens focus normalization is :-0.25≤R
2≤-0.2 ,-0.15≤R
3≤-0.1 and-0.25≤R
4≤-0.2, wherein, radius of curvature R
2, R
3, R
4Be followed successively by primary mirror, grating and three mirrors; System satisfies thing, as Fang Yuanxin.
2. a kind of minisized hyper-spectral image-forming system according to claim 1 is characterized in that: described primary mirror is identical with the radius-of-curvature of three mirrors, and the radius-of-curvature of grating is their 1/2nd.
3. a kind of minisized hyper-spectral image-forming system according to claim 1 is characterized in that: described grating surface peak is positioned on the optical axis, and it and primary mirror, three vertex dot spacings are 1/2nd of their radius-of-curvature.
4. a kind of minisized hyper-spectral image-forming system according to claim 1 is characterized in that: described grating constant is that every millimeter 400～450 line is right.
5. a kind of minisized hyper-spectral image-forming system according to claim 1, it is characterized in that: described primary mirror, grating and three mirrors are integrated in the optical glass substrate that two gummeds form, wherein, the rear surface of a last optical glass substrate and a back optical glass substrate is protruding sphere, and the front surface of a back optical glass substrate is a concave spherical surface; Primary mirror is positioned at the top of the rear surface of a back optical glass substrate, and three mirrors are positioned at the below of the rear surface of a back optical glass substrate, and primary mirror and three mirrors constitute by the rear surface corresponding site plating highly reflecting films of a back optical glass substrate; Grating is positioned at the protruding sphere centre position of last optical glass substrate rear surface, and its surperficial peak is positioned on the optical axis.
6. a kind of according to claim 1 or 5 minisized hyper-spectral image-forming system is characterized in that: the span of the refractive index n of described optical glass substrate is 1≤n≤2.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710302608XA CN100545697C (en) | 2007-12-29 | 2007-12-29 | Minisized hyper-spectral image-forming system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710302608XA CN100545697C (en) | 2007-12-29 | 2007-12-29 | Minisized hyper-spectral image-forming system |
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| CN101216595A true CN101216595A (en) | 2008-07-09 |
| CN100545697C CN100545697C (en) | 2009-09-30 |
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|---|---|---|---|
| CNB200710302608XA Expired - Fee Related CN100545697C (en) | 2007-12-29 | 2007-12-29 | Minisized hyper-spectral image-forming system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519592A (en) * | 2011-12-23 | 2012-06-27 | 北京空间机电研究所 | Compact wide-field large-calibre high-resolution spectral imaging system |
| CN102834702A (en) * | 2010-04-01 | 2012-12-19 | 浜松光子学株式会社 | Spectrometer module |
| CN103292901A (en) * | 2012-03-02 | 2013-09-11 | 索尼公司 | Spectrometric optical system and spectrometer |
| CN103852163A (en) * | 2014-03-14 | 2014-06-11 | 苏州大学 | Miniature beam splitting system suitable for miniature imaging spectrometer |
| US9285270B2 (en) | 2010-04-01 | 2016-03-15 | Hamamatsu Photonics K.K. | Spectrometer module |
| CN109781261A (en) * | 2018-12-31 | 2019-05-21 | 苏州大学 | Compact refraction-reflection type is without thermalization imaging spectrometer |
| CN110888240A (en) * | 2019-11-06 | 2020-03-17 | 苏州大学 | Rapid adjusting method of Offner type spectral imaging optical system |
| CN112577601A (en) * | 2020-12-04 | 2021-03-30 | 中国科学院西安光学精密机械研究所 | Optical system of materialized Offner optical path structure spectral imager |
| CN112903103A (en) * | 2021-01-22 | 2021-06-04 | 西安电子科技大学 | Computed spectrum imaging system and method based on DMD and complementary all-pass |
-
2007
- 2007-12-29 CN CNB200710302608XA patent/CN100545697C/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102834702A (en) * | 2010-04-01 | 2012-12-19 | 浜松光子学株式会社 | Spectrometer module |
| CN102834702B (en) * | 2010-04-01 | 2015-04-08 | 浜松光子学株式会社 | Spectrometer module |
| US9074933B2 (en) | 2010-04-01 | 2015-07-07 | Hamamatsu Photonics K.K. | Spectrometer module |
| US9285270B2 (en) | 2010-04-01 | 2016-03-15 | Hamamatsu Photonics K.K. | Spectrometer module |
| US9851247B2 (en) | 2010-04-01 | 2017-12-26 | Hamamatsu Photonics K.K. | Spectrometer module |
| CN102519592A (en) * | 2011-12-23 | 2012-06-27 | 北京空间机电研究所 | Compact wide-field large-calibre high-resolution spectral imaging system |
| CN103292901A (en) * | 2012-03-02 | 2013-09-11 | 索尼公司 | Spectrometric optical system and spectrometer |
| CN103852163A (en) * | 2014-03-14 | 2014-06-11 | 苏州大学 | Miniature beam splitting system suitable for miniature imaging spectrometer |
| CN109781261A (en) * | 2018-12-31 | 2019-05-21 | 苏州大学 | Compact refraction-reflection type is without thermalization imaging spectrometer |
| CN110888240A (en) * | 2019-11-06 | 2020-03-17 | 苏州大学 | Rapid adjusting method of Offner type spectral imaging optical system |
| CN112577601A (en) * | 2020-12-04 | 2021-03-30 | 中国科学院西安光学精密机械研究所 | Optical system of materialized Offner optical path structure spectral imager |
| CN112903103A (en) * | 2021-01-22 | 2021-06-04 | 西安电子科技大学 | Computed spectrum imaging system and method based on DMD and complementary all-pass |
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| CN100545697C (en) | 2009-09-30 |
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