CN202306007U - Refractive-reflective grating prism combined dispersion component - Google Patents
Refractive-reflective grating prism combined dispersion component Download PDFInfo
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- CN202306007U CN202306007U CN2011203965709U CN201120396570U CN202306007U CN 202306007 U CN202306007 U CN 202306007U CN 2011203965709 U CN2011203965709 U CN 2011203965709U CN 201120396570 U CN201120396570 U CN 201120396570U CN 202306007 U CN202306007 U CN 202306007U
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- prism
- grating
- chromatic dispersion
- refractive
- dispersion assembly
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Abstract
The utility model discloses a refractive-reflective grating prism combined dispersion component, which is characterized in that: the dispersion component consists of a prism and a reflective grating to form a refractive-reflective light split structure; and therefore, not only a low-spectrum bending light split function can be realized, but also light split of different spectrum bands and flexible light machine layout can be conveniently realized. The refractive-reflective grating prism combined dispersion component has the advantages of flexibility in selection of spectrum bands, low light spectrum bending, high optical efficiency and capability of meeting research and development requirements of a compact and high-cost-performance imaging spectrometer.
Description
Technical field
The utility model relates to optical module, the system in the light spectrum image-forming technology, specifically is meant a kind of catadioptric formula grating prism combination chromatic dispersion assembly.
Background technology
Imaging spectrometer is to be used for one of key instrument that carries out target detection identification and material composition analysis.The geometric properties that it can obtain target simultaneously distributes and spectral signature information, is widely used in fields such as geologic prospect, environmental monitoring, agricultural economy and scientific researches.
The beam split function of imaging spectrometer is realized by light-splitting device.The light-splitting device of color dispersion-type imaging spectrometer has prism, grating, prism-grating combination.Prism and grating have relative merits separately, and adopt prism and grating to make up often both advantages.Finland Mauri Aikio disclosed a kind of prism-grating-prism chromatic dispersion device in patent WO9321548A1 in 1992, and its grating is the holographic body phase grating of transmission-type, has direct-view property.Afterwards, University Of Suzhou also discloses a kind of prism-grating-prism chromatic dispersion device in patent 200810156858.1, and both have all adopted transmission grating, forms the light path configuration of transmission-type direct projection shape.Above-mentioned device possesses the deficiency of following several respects: 1) owing to material and manufacture craft, its stability is reliable not as reflective plane grating, and it is bigger to see through the spectral coverage restriction, counts transmission grating especially for the low groove of infrared spectroscopy and makes difficult; The light path configuration of 2) direct-view property has adapted to not the specific requirement of Aero-Space imaging spectral instrument to the configuration layout; 3) transmission grating is compared with reflection grating, and alternative kind is less, needs customization basically, causes system price expensive.
Summary of the invention
The technology of the utility model is dealt with problems and is: based on the some shortcomings of above-mentioned prior art existence; The purpose of the utility model provides a kind of catadioptric formula grating prism combination chromatic dispersion assembly; When realizing the crooked beam split function of low spectrum; The beam split that realizes different spectral coverage easily reaches ray machine layout flexibly, satisfies the development requirement of compact, high performance-price ratio imaging spectrometer.
The light path signal of direct viewing type imaging spectrometer is as shown in Figure 1, and whole optical system is by imaging mirror 1, collimating mirror 2, chromatic dispersion assembly 3, convergent mirror 4, detector 5.The utility model such as Fig. 2, Fig. 3 signal; Light beam from object space is imaged on the linear array slit by imaging mirror 1; Light through the linear array slit gets into the prism 301 and reflection grating 302 beam split of chromatic dispersion assembly 3 after by collimating mirror 2 collimations successively; Light beam after the beam split is assembled to detector 5 by convergent mirror 4, obtains the spectrum picture of target.
Wherein the chromatic dispersion assembly is made up of prism 301 and reflection grating 302; Form the beam-splitting structure of refraction-reflection; When utilizing grating dispersion linear array slit spectral line towards the long wave direction and during the prism chromatic dispersion spectral line realize the crooked beam split function of low spectrum towards the crooked characteristic of shortwave direction.Its design procedure is following:
1) at first according to grating equation, by required spectral range λ
1～λ
2, the convergent mirror focal distance f, the length L of spectrum dimension is confirmed the angular dispersion of grating, thereby confirms the grating constant of grating;
2) with linear array slit length, grating constant, prism material modeling in optics software, the spectrum amount of bow as evaluation function, is optimized, thereby obtains the wedge angle of prism.And the optics and the structural parameters of chromatic dispersion assembly have been confirmed thus.
Thus, completion is to the design of the major parameter of combination chromatic dispersion assembly.
Described reflection grating 302 and prism 301 were both discrete, one-tenth rib grid 6 also capable of being combined; Reflection grating 302 can realize the configuration layout flexibly through the control incident angle of light, satisfies the concrete structure requirement.
Described prism 301 for satisfying light path layout, both can be single prism, can be a plurality of prism combinations again.
The advantage of the utility model chromatic dispersion assembly is:
1. system architecture is compact, makes things convenient for the configuration layout;
2. the chromatic dispersion assembly adopts the grating prism combination, can obtain linear dispersion spectrum, also helps proofreading and correct the spectrum bending; Adopt the plane reflection grating of glittering, can obtain higher diffraction efficiency, it is unimpeded to obtain channel, low price.
4. the placement angle of the reflective plane grating in the chromatic dispersion assembly can be according to the light path flexible design;
5. use reflective plane grating in the chromatic dispersion assembly, do not receive the restriction of grating material, can be applicable to the spectrum beam split from the ultraviolet to the infrared band as required;
Description of drawings
Fig. 1 is the imaging optical spectrometer light path synoptic diagram, among the figure:
1 is the imaging mirror;
2 is collimating mirror;
3 are the chromatic dispersion assembly;
4 is convergent mirror;
5 is detector.
Fig. 2 is the imaging optical spectrometer light path synoptic diagram of discrete catadioptric prism grating combination beam split, among the figure:
301 is prism;
302 is reflection grating;
θ is the angle of wedge of prism 301.
Fig. 3 is the imaging optical spectrometer light path synoptic diagram of rib grid beam split, among the figure:
601 is the plane of incidence of rib grid;
602 is reflection grating;
603 is the exit facet of rib grid;
θ is the angle of wedge of prism rib grid exit facet 603.
Embodiment
The structural representation that at present combines Fig. 2, Fig. 3 is explained the embodiment of the utility model, rather than limits the scope of application of the utility model.
To the spectrum imaging system of identical following technical indicator, designed the chromatic dispersion assembly of Fig. 2 and Fig. 3.
The spectrum imaging system technical indicator:
Spectral range: 450～1000nm,
Slit length: 7.68mm,
Spectral width: 3.84mm,
Beam splitting system object space numerical aperture: 0.15,
The beam splitting system magnification: be 1:1,
Slit is crooked:＜5 μ m.
Design result:
Prism 301 is a quartz material among Fig. 2, and its wedge angle is 8.3 °; Reflection grating 302 is a quartz material, and the normal groove number of its grating is 117l/mm.
Claims (3)
1. a catadioptric formula grating prism makes up the chromatic dispersion assembly, it is characterized in that:
Chromatic dispersion assembly (3) is made up of prism (301) and reflection grating (302), forms the beam-splitting structure of refraction-reflection; Light beam from object space is imaged on the linear array slit by imaging mirror (1); Prism (301) and reflection grating (302) beam split that light through the linear array slit gets into chromatic dispersion assembly (3) after by collimating mirror (2) collimation successively; Light beam after the beam split is assembled to detector (5) by convergent mirror (4), obtains the spectrum picture of target.
2. a kind of catadioptric formula grating prism combination chromatic dispersion assembly according to claim 1, it is characterized in that: described reflection grating (302) and prism (301) are discrete, perhaps combine like rib grid (6).
3. a kind of catadioptric formula grating prism combination chromatic dispersion assembly according to claim 1, it is characterized in that: described prism (301) is a plurality of prism combinations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203965709U CN202306007U (en) | 2011-10-18 | 2011-10-18 | Refractive-reflective grating prism combined dispersion component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203965709U CN202306007U (en) | 2011-10-18 | 2011-10-18 | Refractive-reflective grating prism combined dispersion component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202306007U true CN202306007U (en) | 2012-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203965709U Expired - Lifetime CN202306007U (en) | 2011-10-18 | 2011-10-18 | Refractive-reflective grating prism combined dispersion component |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102375233A (en) * | 2011-10-18 | 2012-03-14 | 中国科学院上海技术物理研究所 | Refraction and reflection type grating prism combined dispersion assembly and designing method thereof |
| CN103575398A (en) * | 2013-11-26 | 2014-02-12 | 武进田 | Echelette-grating light splitting device of UV/VIS/NIR spectrophotometer |
| CN104359553A (en) * | 2014-12-05 | 2015-02-18 | 中国科学院光电研究院 | Compact grating dispersion spectral imager |
-
2011
- 2011-10-18 CN CN2011203965709U patent/CN202306007U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102375233A (en) * | 2011-10-18 | 2012-03-14 | 中国科学院上海技术物理研究所 | Refraction and reflection type grating prism combined dispersion assembly and designing method thereof |
| CN103575398A (en) * | 2013-11-26 | 2014-02-12 | 武进田 | Echelette-grating light splitting device of UV/VIS/NIR spectrophotometer |
| CN104359553A (en) * | 2014-12-05 | 2015-02-18 | 中国科学院光电研究院 | Compact grating dispersion spectral imager |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |
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| CX01 | Expiry of patent term |