CN204165651U - Off-axis sphere sapphire prism medium-wave infrared imaging spectrometer - Google Patents
Off-axis sphere sapphire prism medium-wave infrared imaging spectrometer Download PDFInfo
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- CN204165651U CN204165651U CN201420597160.4U CN201420597160U CN204165651U CN 204165651 U CN204165651 U CN 204165651U CN 201420597160 U CN201420597160 U CN 201420597160U CN 204165651 U CN204165651 U CN 204165651U
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Abstract
This patent discloses a kind of medium-wave infrared imaging spectrometer based on the prismatic decomposition of off-axis sphere sapphire, spectrometer is made up of slit, concave mirror, sphere sapphire prism, concave mirror, the photosensitive unit of detector; The first described concave mirror is recessed oblate spheroid catoptron, and described sphere sapphire prism first surface is transmission sphere, and described second, sphere sapphire prism is interior reflective surface, and the second described concave mirror is ellipsoidal shaped mirror; Described slit and the first concave mirror arranged opposite, the first concave mirror and sphere sapphire prism arranged opposite, sphere sapphire prism and the second concave mirror arranged opposite, the second concave mirror and the photosensitive first arranged opposite of detector; Adopt the medium-wave infrared hyperspectral imager volume compact of this patent, picture element is good, and light collecting light ability is strong, and optical efficiency is high, can be applied to the fields such as chemical gas detection, mineral detection.
Description
Technical field
This patent relates to a kind of medium-wave infrared imaging spectrometer, is specifically related to a kind of off-axis sphere sapphire prism medium-wave infrared imaging spectrometer.
Background technology
High light spectrum image-forming technology has important application at remote sensing fields, and disclosed hyperspectral imager operates mainly in visible ray, near infrared, short infrared wave band at present.Medium-wave infrared hyperspectral imager technical difficulty is large, and technical scheme rarely seen at present utilizes grating beam splitting.
Grating beam splitting imaging spectrometer is divided into plane grating, concave grating, convex grating three kinds, and comparatively speaking, the imaging spectrometer based on plane grating and concave grating exists more serious spectrum and bends; And although medium-wave infrared convex grating imaging spectrograph picture element is good, incisure density is usually lower, and the cost realizing glittering is very high.
The optical efficiency of Specim company of current rarely seen disclosed Finland development M50 medium wave imaging spectrometer is about 40%.
The imaging spectrometer based on off-axis sphere sapphire prism that this patent proposes, picture element is excellent, and optical efficiency high (can reach more than 80%), can be widely used in the Developing Application of medium-wave infrared hyperspectral imager.
Summary of the invention
The object of this patent is to provide the medium-wave infrared imaging spectrometer that a kind of picture element is excellent, spectroscopical effeciency is high, solves the technical matters that optical efficiency is low, image quality is undesirable that existing spectrometer exists.
The technical scheme that this patent adopts is: a kind of prismatic spectrum instrument system, see Fig. 1, adopt from axle refraction-reflection type optical texture, light is imaged on slit jaw 1 through object lens, successively through slit 1, collimating mirror 2, off-axis sphere sapphire prism 3, convergence catoptron 4, final convergence is imaged onto detector photosurface 5.System meets thing, the image space heart far away.
Described catoptron 2 is the recessed oblate spheroid reflecting surface used from axle;
The first surface 301 of described off-axis sphere sapphire prism 3 and the optical surface in the second face 302 are sphere, wherein first surface 301 is interior reflective surface, second face 302 is transmission surface, through catoptron 2 reflect light first through the second face 302, again after first surface 301 internal reflection, then converge catoptron 4 by the second face 302 directive;
Described convergence catoptron 4 is the recessed elliposoidal reflecting surface used from axle;
As shown in Figure 2, there is relative deflecting relationship in optical axis or the normal of described each optical surface, wherein:
First surface 301 optical axis of off-axis sphere sapphire 3 and collimating mirror 2 optical axis offset, drift angle is between the two α, and its span is α ∈ [3.99564 °, 5.43426 °];
Second face 302 optical axis of off-axis sphere sapphire 3 and first surface 301 optical axis offset, drift angle is between the two β, and its span is β ∈ [1.76325 °, 8.25127 °];
Converge the second face 302 optical axis offset of catoptron 4 optical axis and off-axis sphere sapphire 3, drift angle is between the two γ, and its span is γ ∈ [1.57215 °, 3.96927 °];
The normal of detector photosurface place plane is relative to convergence catoptron 4 optical axis offset, and drift angle is between the two δ, and its span is δ ∈ [2.19065 °, 2.62970 °].
The advantage of this patent is:
Compare conventional spectrometers, this prism spectrometer system architecture is simple, and volume is little, lightweight, and picture element is good, and optical efficiency is high.
Accompanying drawing explanation
Fig. 1 off-axis sphere sapphire prism imaging spectrometer optical texture.
The relative off-axis schematic diagram of each optical surface of Fig. 2.
Fig. 3 case study on implementation 1 (dispersion width 0.3mm) Designing Transfer Function (2.5 mu m waveband).
Fig. 4 case study on implementation 1 (dispersion width 0.3mm) Designing Transfer Function (3.4 mu m waveband).
Fig. 5 case study on implementation 1 (dispersion width 0.3mm) Designing Transfer Function (4.2 mu m waveband).
Fig. 6 case study on implementation 1 (dispersion width 1.2mm) Designing Transfer Function (5.0 mu m waveband).
Fig. 7 case study on implementation 2 (dispersion width 1.2mm) Designing Transfer Function (2.5 mu m waveband).
Fig. 8 case study on implementation 2 (dispersion width 1.2mm) Designing Transfer Function (3.4 mu m waveband).
Fig. 9 case study on implementation 2 (dispersion width 1.2mm) Designing Transfer Function (4.2 mu m waveband).
Figure 10 case study on implementation 2 (dispersion width 1.2mm) Designing Transfer Function (5.0 mu m waveband).
Figure 11 case study on implementation 3 (dispersion width 1.8mm) Designing Transfer Function (2.5 mu m waveband).
Figure 12 case study on implementation 3 (dispersion width 1.8mm) Designing Transfer Function (3.4 mu m waveband).
Figure 13 case study on implementation 3 (dispersion width 1.8mm) Designing Transfer Function (4.2 mu m waveband).
Figure 14 case study on implementation 3 (dispersion width 1.8mm) Designing Transfer Function (5.0 mu m waveband).
Embodiment
According to technique scheme, devise three and there is identical relative aperture, service band and slit length, but the off-axis sphere sapphire medium-wave infrared prism spectrometer that dispersion width is different.
Embodiment 1:
F#=2.5, service band is 2.5 μm-5 μm, slit length 12mm, dispersion width 0.3mm (adopt 30 μm of pixels, can realize the detection of 10 wave bands).Lens parameters is as following table:
Lens parameters table
Wherein collimating mirror 2 opposing slit 1 departs from 24mm;
α=3.99564 °, drift angle between first surface 301 optical axis of off-axis sphere sapphire 3 and collimating mirror 2 optical axis;
β=1.76325 °, drift angle between second face 302 optical axis of off-axis sphere sapphire 3 and first surface 301 optical axis;
Converge γ=1.57215 °, drift angle between catoptron 4 optical axis and the second face 302 optical axis of off-axis sphere sapphire 3;
Converging drift angle between catoptron 4 optical axis and the second face 302 optical axis of off-axis sphere sapphire 3 is δ=2.62970 °.
See the modulation transfer function curve that accompanying drawing 3, Fig. 4, Fig. 5, Fig. 6 are the optical systems described in example, can find out, system MTF is greater than 0.5, meets imaging requirements.
Embodiment 2:
F#=2.5, service band is 2.5 μm-5 μm, slit length 12mm, dispersion width 1.2mm (adopt 30 μm of pixels, can realize the detection of 40 wave bands).Lens parameters is as following table:
Lens parameters table
Wherein collimating mirror 2 opposing slit 1 departs from 24mm;
α=5.15882 °, drift angle between first surface 301 optical axis of off-axis sphere sapphire 3 and collimating mirror 2 optical axis;
β=6.26184 °, drift angle between second face 302 optical axis of off-axis sphere sapphire 3 and first surface 301 optical axis;
Converge γ=3.04601 °, drift angle between catoptron 4 optical axis and the second face 302 optical axis of off-axis sphere sapphire 3;
Converging drift angle between catoptron 4 optical axis and the second face 302 optical axis of off-axis sphere sapphire 3 is δ=2.44958 °.
See the modulation transfer function curve that accompanying drawing 7, Fig. 8, Fig. 9, Figure 10 are the optical systems described in example, can find out, system MTF is greater than 0.5, meets imaging requirements.
Embodiment 3:
F#=2.5, service band is 2.5 μm-5 μm, slit length 12mm, dispersion width 1.8mm (adopt 30 μm of pixels, can realize the detection of 60 wave bands).Lens parameters is as following table:
Lens parameters table
Wherein collimating mirror 2 opposing slit 1 departs from 24mm;
α=5.43426 °, drift angle between first surface 301 optical axis of off-axis sphere sapphire 3 and collimating mirror 2 optical axis;
β=8.25127 °, drift angle between second face 302 optical axis of off-axis sphere sapphire 3 and first surface 301 optical axis;
Converge γ=3.96927 °, drift angle between catoptron 4 optical axis and the second face 302 optical axis of off-axis sphere sapphire 3;
Converging drift angle between catoptron 4 optical axis and the second face 302 optical axis of off-axis sphere sapphire 3 is δ=2.19065 °.
See the modulation transfer function curve that accompanying drawing 11, Figure 12, Figure 13, Figure 14 are the optical systems described in example, can find out, system MTF is greater than 0.5, meets imaging requirements.
Claims (1)
1. an off-axis sphere sapphire prism medium-wave infrared imaging spectrometer, light is imaged on slit jaw (1) through object lens, successively through slit (1), collimating mirror (2), off-axis sphere sapphire prism (3), convergence catoptron (4), final convergence is imaged onto detector photosurface (5), it is characterized in that:
Described collimating mirror (2) is the recessed oblate spheroid reflecting surface used from axle;
Described convergence catoptron (4) is the recessed elliposoidal reflecting surface used from axle;
The first surface (301) of described off-axis sphere sapphire prism (3) and the optical surface of second (302) are sphere, wherein first surface (301) is interior reflective surface, and second (302) are transmission surface;
Between spectrometer each several part, position relationship is:
First surface (301) optical axis of described off-axis sphere sapphire (3) and collimating mirror (2) optical axis offset, drift angle is between the two α, and its span is α ∈ [3.99564 °, 5.43426 °];
Second (302) optical axis of described off-axis sphere sapphire (3) and first surface (301) optical axis offset, drift angle is between the two β, and its span is β ∈ [1.76325 °, 8.25127 °];
Second (302) optical axis offset of described convergence catoptron (4) optical axis and off-axis sphere sapphire (3), drift angle is between the two γ, and its span is γ ∈ [1.57215 °, 3.96927 °];
The normal of described detector photosurface place plane is relative to convergence catoptron (4) optical axis offset, and drift angle is between the two δ, and its span is δ ∈ [2.19065 °, 2.62970 °].
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420597160.4U CN204165651U (en) | 2014-01-17 | 2014-10-16 | Off-axis sphere sapphire prism medium-wave infrared imaging spectrometer |
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| CN2014100208936 | 2014-01-17 | ||
| CN201410020893.6A CN103852165A (en) | 2014-01-17 | 2014-01-17 | Medium-wave infrared imaging spectrometer with off-axis spherical surface sapphire prism |
| CN201420597160.4U CN204165651U (en) | 2014-01-17 | 2014-10-16 | Off-axis sphere sapphire prism medium-wave infrared imaging spectrometer |
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| CN201420597160.4U Withdrawn - After Issue CN204165651U (en) | 2014-01-17 | 2014-10-16 | Off-axis sphere sapphire prism medium-wave infrared imaging spectrometer |
| CN201410546699.1A Active CN104330158B (en) | 2014-01-17 | 2014-10-16 | A kind of off-axis sphere sapphire prism medium-wave infrared imaging spectrometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104330158A (en) * | 2014-01-17 | 2015-02-04 | 中国科学院上海技术物理研究所 | Off-axis spherical sapphire prism medium wave infrared imaging spectrometer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11067441B2 (en) | 2017-02-08 | 2021-07-20 | Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno | Correction of curved projection of a spectrometer slit line |
| CN109060129B (en) * | 2018-08-20 | 2023-11-07 | 中国科学院上海技术物理研究所 | Imaging spectrometer optical system based on free-form surface and curved prism |
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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| US7345760B2 (en) * | 2006-01-13 | 2008-03-18 | Thermo Electron Scientific Instruments Llc | Grating monochromator/spectrograph |
| CN101672694A (en) * | 2009-10-16 | 2010-03-17 | 中国科学院上海技术物理研究所 | Optical system of spectroscopic imaging spectrometer of prism |
| CN103852165A (en) * | 2014-01-17 | 2014-06-11 | 中国科学院上海技术物理研究所 | Medium-wave infrared imaging spectrometer with off-axis spherical surface sapphire prism |
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- 2014-01-17 CN CN201410020893.6A patent/CN103852165A/en active Pending
- 2014-10-16 CN CN201420597160.4U patent/CN204165651U/en not_active Withdrawn - After Issue
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104330158A (en) * | 2014-01-17 | 2015-02-04 | 中国科学院上海技术物理研究所 | Off-axis spherical sapphire prism medium wave infrared imaging spectrometer |
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| Publication number | Publication date |
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| CN103852165A (en) | 2014-06-11 |
| CN104330158B (en) | 2016-05-18 |
| CN104330158A (en) | 2015-02-04 |
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Granted publication date: 20150218 Effective date of abandoning: 20160518 |
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