CN103604498A - Broad-spectrum light-splitting system for Offner imaging spectrometer - Google Patents
Broad-spectrum light-splitting system for Offner imaging spectrometer Download PDFInfo
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- CN103604498A CN103604498A CN201310638540.8A CN201310638540A CN103604498A CN 103604498 A CN103604498 A CN 103604498A CN 201310638540 A CN201310638540 A CN 201310638540A CN 103604498 A CN103604498 A CN 103604498A
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Abstract
The invention relates to a broad-spectrum light-splitting system for an Offner imaging spectrometer. The broad-spectrum light-splitting system for the Offner imaging spectrometer comprises a light source, two concave reflecting mirrors, a convex optical grating and an area array detector, wherein the convex surface of the convex optical grating faces the concave surfaces of the two concave reflecting mirrors so that the spherical center of the convex optical grating and the spherical centers of the two concave reflecting mirrors can be all located on an optical axis Z, the light source is arranged on a plane which is perpendicular to the optical axis Z and located in front of the concave surface of the first concave reflecting mirror, a light beam emitted by the light source shines the first concave reflecting mirror and then is reflected onto the convex optical grating through the first concave reflecting mirror, and a diffraction spectrum which is obtained after the light beam passes through the convex optical grating shines the second concave reflecting mirror and then is converged onto the area array detector through the second concave reflecting mirror. Due to the fact that the light-splitting system is composed of the convex optical grating and the two concave reflecting mirrors, a spectrum image can be distributed on one plane continuously; due to the simulation and optimization of the structure of the system, the position of an objective image and all structure parameters can be determined at the optimal imaging moment, the structure is simple, and design is convenient.
Description
Technical field
The present invention relates to a kind of spectral instrument, particularly a kind of wide spectrum Offner imaging spectrometer beam splitting system.
Background technology
Imaging spectrometer is to have take a kind of remote optical sensing instrument that can simultaneously gather atural object shape characteristic and spectral signature that spectral remote sensing imaging technique gets up as base growth since the eighties in 20th century, has collection of illustrative plates unification property.Be widely used in the association areas such as satellite remote sensing technology, forestry, agricultural, geology, medicine, military affairs, ocean, geologic prospecting, the manufacturing, colorimetry, ecology.And in all types of imaging spectrometers, Offner imaging spectrometer is because it has compact conformation, intrinsic aberration is little, the efficiency of light energy utilization is high, good imaging quality, resolution advantages of higher, makes it be subject to paying close attention to more widely, and successfully for external many remote sensors.
For Offner type imaging spectrometer structure, more existing relevant reports, as patent " Convex diffraction grating imaging spectrometers " (granted patent number 5880834) proposed from axle three reflection configurations, this imaging spectrometer beam splitting system is when design, based on Rowland circle structure, and can only aspect the astigmatism that disappear, play good effect for this structure, can not take into account the impact of other aberrations simultaneously.The spectroscopic imaging system that patent " the spectroscopic imaging system of flattened field imaging spectrometer " (publication number 102331299A) proposes has possessed lot of advantages, but its structural parameters are bigger than normal, miniaturization not, spectral range is at short infrared wave band, and range of application is less.Therefore, develop simple in structure, design convenience, spectral range is wide, image quality is high, applied range, and the Offner imaging spectrometer of miniaturization is very urgent, and is with a wide range of applications.
Summary of the invention
The present invention be directed to existing beam splitting system complex structure, difficult design, the problem that spectral range is narrower, has proposed a kind of wide spectrum Offner imaging spectrometer beam splitting system, with convex grating and two concave mirrors, forms concentric beam splitting system.By the simulation and optimization to this structure, while determining optimal imaging, the image position of beam splitting system and each structural parameters, simple in structure, and design is convenient.
Technical scheme of the present invention is: a kind of wide spectrum Offner imaging spectrometer beam splitting system, comprise light source, two concave mirrors, convex grating and planar array detector, convex grating convex surface is placed facing to two concave mirror concave surfaces, three's the centre of sphere is all placed on optical axis Z, light source is placed in the plane perpendicular to optical axis Z, and be positioned at first concave mirror concave surface the place ahead, the light beam irradiates that light source sends is to the first concave mirror, through the first concave mirror, reflex on convex grating, the diffraction spectrum obtaining after convex grating is irradiated on the second concave mirror again, finally by the second concave mirror, converge on planar array detector.
The radius-of-curvature of described convex grating is 88.7mm, groove number is the equidistant cutting of 100/mm, the radius-of-curvature of the first concave mirror is 160.9mm, and the radius-of-curvature of the second concave mirror is 160.1mm, and the centre of sphere of convex grating and two concave mirrors is all placed on optical axis Z.Described light source distance the first concave mirror is 123.9mm, and this distance refers to the vertical point of light source on Z axis and the distance between the first concave mirror and the intersection point of Z axis; The distance of two concave mirrors and convex grating is 75.7mm simultaneously, and this distance refers to two concave mirrors and the convex grating distance respectively and between the intersection point of Z axis; Planar array detector is placed on to distance the second concave mirror 189.4mm place, and this is apart from referring to the vertical point of planar array detector on Z axis and the distance between the second concave mirror and the intersection point of Z axis, and planar array detector is got-1 grade of spectrum.
Beneficial effect of the present invention is: a kind of wide spectrum Offner imaging spectrometer beam splitting system of the present invention, make spectral image continuous distribution in one plane, and have simple in structure, design is convenient, is easy to Installation and Debugging, and image quality is high, the advantages such as spectral range is wide, applied range.
Accompanying drawing explanation
Fig. 1 is the wide spectrum Offner of the present invention imaging spectrometer beam splitting system light path schematic diagram.
Embodiment
Wide spectrum Offner imaging spectrometer beam splitting system light path as shown in Figure 1, system comprises light source 5, the first concave mirror 1, convex grating 2, concave mirror 23 and planar array detector 4.Convex grating 2 convex surfaces are placed facing to two concave mirrors, 1,3 concave surfaces, make three's the centre of sphere all be placed in optical axis Z above, and light source is placed in the plane perpendicular to optical axis Z, and is positioned at first concave mirror concave surface the place ahead.The light beam irradiates that light source 5 sends is to the first concave mirror 1, through the first concave mirror 1, reflex on convex grating 2, the diffraction spectrum obtaining after convex grating 2 is irradiated on the second concave mirror 3 again, finally by the second concave mirror 3, converges on planar array detector 4.
Select a convex grating 2 and two concave mirrors 1,3, wherein, the radius-of-curvature of convex grating is 88.7mm, the equidistant cutting that groove number is 100/mm, the radius-of-curvature of the first concave mirror 1 is 160.9mm, and the radius-of-curvature of the second concave mirror 3 is 160.1mm; The centre of sphere of convex grating 2 and two concave mirrors 1,3 is all placed on to optical axis Z upper, sets up a beam splitting system; Light source 5 is placed in the plane perpendicular to optical axis Z, and be positioned at first concave mirror concave surface the place ahead, distance the first concave mirror 1 is 123.9mm, this distance refers to the vertical point of light source on Z axis and the distance between the first concave mirror 1 and the intersection point of Z axis (in figure, concave mirror has only been illustrated part, and in kind and Z axis has intersection point).The distance of two concave mirrors 1,3 and convex grating 2 is 75.7mm simultaneously, and this distance refers to two concave mirrors and the convex grating distance respectively and between the intersection point of Z axis.It is 189.4mm that planar array detector 4 is placed on to distance the second concave mirror 3, and this distance refers to the vertical point of planar array detector on Z axis and the distance between the second concave mirror 3 and the intersection point of Z axis, and planar array detector is got-1 grade of spectrum.
The F/#=3.72 of this beam splitting system, effective focal length is EFL=-747.8mm, can in wider spectral range, (270nm-1300nm) realize high-quality imaging, its root mean square point range figure diameter can reach 10
-1μ m magnitude, MTF(modulation transfer function) curve has also reached good imaging effect.
Claims (3)
1. one kind wide spectrum Offner imaging spectrometer beam splitting system, it is characterized in that, comprise light source (5), two concave mirrors (1, 3), convex grating (2) and planar array detector (4), convex grating (2) convex surface is facing to two concave mirrors (1, 3) concave surface is placed, three's the centre of sphere is all placed on optical axis Z, light source (5) is placed in the plane perpendicular to optical axis Z, and be positioned at the first concave mirror (1) concave surface the place ahead, the light beam irradiates that light source (5) sends is to the first concave mirror (1), through the first concave mirror (1), reflex on convex grating (2), the diffraction spectrum obtaining after convex grating (2) is irradiated on the second concave mirror (3) again, finally by the second concave mirror (3), converge on planar array detector (4).
2. wide spectrum Offner imaging spectrometer beam splitting system according to claim 1, it is characterized in that, the radius-of-curvature of described convex grating (2) is 88.7mm, groove number is the equidistant cutting of 100/mm, the radius-of-curvature of the first concave mirror (1) is 160.9mm, the radius-of-curvature of the second concave mirror (3) is 160.1mm, and the centre of sphere of convex grating (2) and two concave mirrors (1,3) is all placed on optical axis Z.
3. wide spectrum Offner imaging spectrometer beam splitting system according to claim 2, it is characterized in that, described light source (5) distance the first concave mirror (1) be 123.9mm, and this is apart from referring to the vertical point of light source (5) on Z axis and the distance between the first concave mirror (1) and the intersection point of Z axis; Two concave mirrors (1,3) are 75.7mm with the distance of convex grating (2) simultaneously, and this distance refers to two concave mirrors (1,3) and the distance of convex grating (2) respectively and between the intersection point of Z axis; Planar array detector (4) is placed on to distance the second concave mirror (3) 189.4mm place, and this is apart from referring to the vertical point of planar array detector on Z axis and the distance between the second concave mirror (3) and the intersection point of Z axis, and planar array detector is got-1 grade of spectrum.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900688A (en) * | 2014-03-28 | 2014-07-02 | 中国科学院上海技术物理研究所 | Imaging spectrometer beam splitting system based on free-form surface |
| CN104614320A (en) * | 2014-12-25 | 2015-05-13 | 北京农业信息技术研究中心 | Total reflection type hyperspectral imaging observation system |
| CN105182510A (en) * | 2015-07-20 | 2015-12-23 | 中国科学院上海光学精密机械研究所 | Spherical Cassegrain system for imaging finite target and adjusting method of spherical Cassegrain system |
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| US5880834A (en) * | 1996-10-16 | 1999-03-09 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Convex diffraction grating imaging spectrometer |
| WO1999056096A1 (en) * | 1998-04-29 | 1999-11-04 | American Holographic, Inc. | Corrected concentric spectrometer |
| CN101852649A (en) * | 2010-06-10 | 2010-10-06 | 上海理工大学 | Image flattening convex grating splitting system |
| CN102331299A (en) * | 2011-06-02 | 2012-01-25 | 苏州大学 | Spectroscopic imaging system of flat-field imaging spectrometer |
| 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 |
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2013
- 2013-12-04 CN CN201310638540.8A patent/CN103604498A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5880834A (en) * | 1996-10-16 | 1999-03-09 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Convex diffraction grating imaging spectrometer |
| WO1999056096A1 (en) * | 1998-04-29 | 1999-11-04 | American Holographic, Inc. | Corrected concentric spectrometer |
| CN101852649A (en) * | 2010-06-10 | 2010-10-06 | 上海理工大学 | Image flattening convex grating splitting system |
| CN102331299A (en) * | 2011-06-02 | 2012-01-25 | 苏州大学 | Spectroscopic imaging system of flat-field imaging spectrometer |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103900688A (en) * | 2014-03-28 | 2014-07-02 | 中国科学院上海技术物理研究所 | Imaging spectrometer beam splitting system based on free-form surface |
| CN104614320A (en) * | 2014-12-25 | 2015-05-13 | 北京农业信息技术研究中心 | Total reflection type hyperspectral imaging observation system |
| CN105182510A (en) * | 2015-07-20 | 2015-12-23 | 中国科学院上海光学精密机械研究所 | Spherical Cassegrain system for imaging finite target and adjusting method of spherical Cassegrain system |
| CN105182510B (en) * | 2015-07-20 | 2017-07-14 | 中国科学院上海光学精密机械研究所 | To the sphere Cassegrain system and its method of adjustment of limited remote object plane imaging |
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Inventor after: Huang Yuanshen Inventor after: Han Pan Inventor after: Huang Yunbai Inventor after: Su Yangqing Inventor after: Ding Weitao Inventor after: Li Baicheng Inventor after: Xu Banglian Inventor before: Han Pan Inventor before: Huang Yuanshen Inventor before: Huang Yunbai Inventor before: Su Yangqing Inventor before: Ding Weitao Inventor before: Li Baicheng Inventor before: Xu Banglian |
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Free format text: CORRECT: INVENTOR; FROM: HAN SHAN HUANG YUANSHEN HUANG YUNBAI SU YANGQING DING WEITAO LI BAICHENG XU BANGLIAN TO: HUANG YUANSHEN HAN SHAN HUANG YUNBAI SU YANGQING DING WEITAO LI BAICHENG XU BANGLIAN |
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Application publication date: 20140226 |