CN103837233A - Spectrum imager based on plane grating light splitting - Google Patents
Spectrum imager based on plane grating light splitting Download PDFInfo
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- CN103837233A CN103837233A CN201410079468.4A CN201410079468A CN103837233A CN 103837233 A CN103837233 A CN 103837233A CN 201410079468 A CN201410079468 A CN 201410079468A CN 103837233 A CN103837233 A CN 103837233A
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Abstract
The invention discloses a spectrum imager based on plane grating light splitting. The spectrum imager comprises a pre-focusing mirror, a slit-reflection plane grating with a transmission gap, a collimation reflector, an imaging lens and a detector. Light emitted by a target passes through the pre-focusing mirror and is converged at the position of an image plane; the converged light passes through the transmission gap of the slit-reflection plane grating, is reflected back to the slit-reflection plane grating by the collimation reflector, is split by the slit-reflection plane grating, reaches the imaging lens, is converged by the imaging lens, and then is imaged at the detector. By the mixed design of a transmission light path and a reflected light path, the spectrum imager based on plane grating light splitting is compact and small in structure, and integration and weight reduction of the spectrum imager are realized through the integrated design of a slit and a reflecting grating.
Description
Technical field
The present invention relates to light spectrum image-forming technical field, relate in particular to a kind of optical spectrum imagers based on plane grating light splitting.
Background technology
Light spectrum image-forming technology can be obtained two-dimensional space information and the one dimension spectral information of target, both image identification that can realize target, the physics of realize target, chemical attribute are surveyed simultaneously, are widely used in fields such as industrial and agricultural production, geologic prospecting, environmental monitoring, Disaster Assessment, city plannings.Under the promotion of application, light spectrum image-forming technology is developed rapidly, and has occurred at present polytype light spectrum image-forming technology, and has played a role at numerous areas.
Current light spectrum image-forming technology, take dispersion light splitting as main, mainly comprises prismatic decomposition, grating beam splitting two classes, and wherein, the major advantage of prism is that optics flux is high, but has dispersion non-linearity problem, and spectral resolution is generally not high; Comparatively speaking, the advantage of grating beam splitting is to obtain high resolution, and linear dispersion spectrum, but its optical efficiency is not high.In the optical spectrum imagers of current successful Application, most grating beam splitting schemes that adopt.
Optical spectrum imagers based on grating beam splitting mainly comprises two types at present, and a class is the plane grating light splitting scheme based on traditional, and a class is the light splitting scheme based on curved surface grating.
Concrete, as shown in Figure 1, the optical spectrum imagers based on plane grating light splitting scheme generally includes preset lens 11, slit 12, collimating mirror 13, plane grating 14, imaging lens 15 and detector 16 etc.In optical spectrum imagers based on plane grating light splitting scheme, all optical elements are arranged in order by optical axis, make system conventionally present thin-and-long structure, and volume is larger, cannot meet the demands in a lot of application scenarios (as SUAV (small unmanned aerial vehicle) remote sensing application).
In optical spectrum imagers based on curved surface grating light splitting scheme, because curved surface grating had both been realized light splitting function, realize imaging function, therefore, system architecture is compact simultaneously.As shown in Figure 2, based on the optical spectrum imagers of convex grating, comprise preset lens 21, slit 22, catoptron 23, convex grating 24, catoptron 25 and detector 26 etc.Compared to Figure 1, optical spectrum imagers based on convex grating is structurally very compact, being beneficial to miniaturization and lightweight realizes, but two catoptrons in system adopt the aberration of aspheric surface corrective system conventionally, therefore, no matter be process or debug, implement and all have very large difficulty, and the development of convex grating be also not so good as plane grating maturation at present.
Therefore, innovative design method be need on optical plan, adopt, on the basis of plane grating light spectrum image-forming scheme, densification and the miniaturization of system realized.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of optical spectrum imagers based on plane grating light splitting, on plane grating light spectrum image-forming basis, realizes densification and miniaturization.
The object of the embodiment of the present invention is achieved through the following technical solutions:
Based on an optical spectrum imagers for plane grating light splitting, comprising:
Comprise preset lens, there is slit plane of reflection grating, collimating mirror, imaging lens and the detector in transmission gap:
The light that target is sent converges in image planes position through described preset lens, converge light behind the transmission gap of described slit plane of reflection grating, return described slit plane of reflection grating through described collimating mirror back reflection, after described slit plane of reflection grating beam splitting, arrive described imaging lens, after described imaging lens converges at described detector image-forming.
The technical scheme being provided by the invention described above embodiment can find out, by transmitted light path and reflected light path Mixed Design, implementation structure densification and miniaturization, realize integrated and lightweight by the Integrated design of slit and reflection grating.
Accompanying drawing explanation
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.
Fig. 1 is the formation schematic diagram of the optical spectrum imagers based on plane grating light splitting in prior art.
Fig. 2 is the formation schematic diagram of the optical spectrum imagers based on curved surface grating light splitting in prior art.
The formation schematic diagram of the optical spectrum imagers based on plane grating light splitting that Fig. 3 provides for the embodiment of the present invention.
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, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to protection scope of the present invention.
As shown in Figure 3, the embodiment of the present invention provides a kind of optical spectrum imagers based on plane grating light splitting, comprises preset lens 31, has slit plane of reflection grating 32, collimating mirror 33, imaging lens 34 and the detector 35 in transmission gap:
The light that target is sent converges in image planes position through preset lens 31, converge light behind the transmission gap of slit plane of reflection grating 32, return slit plane of reflection grating 32 through collimating mirror 33 back reflections, after 32 light splitting of slit plane of reflection grating, arrive imaging mirror 34, after imaging lens 34 converges in detector 35 imagings.
The technical scheme being provided by the invention described above embodiment can be found out, for the problem long and narrow based on plane grating spectrophotometric spectra imager system bulk, structure is not compact, the optical spectrum imagers of the embodiment of the present invention based on plane grating light splitting adopts transmitted light path and reflected light path Mixed Design method, sleeve configuration light channel structure is become to catadioptric light channel structure, realize turning back and compact conformation, miniaturization of light path, much to the constrained application scenario of physical dimension, can not be subject to the restriction of dimension constraint, universality is high.
The optical spectrum imagers of the embodiment of the present invention based on plane grating light splitting adopts catoptron, slit and grating integrated design to realize system integration, reduced the complexity of system, is beneficial to the development of system, reduced the volume and weight of system.
Optionally, slit plane of reflection grating 32 can comprise slit 321 and reflective plane grating 322, reflective plane grating tool 322 has the first transmission gap 3221, slit 321 has the second transmission gap 3211, the width in the corresponding second transmission gap 3211 of width in the first transmission gap 3221, slit 321 is positioned at the image planes position of preset lens 31.
In specific implementation, slit 321 can be bonded in one with reflective plane grating 322, realizes slit and grating is integrated, but not limited.
Slit belongs to the primary element of optical spectrum imagers, and it can, according to different parameter indexs, design targetedly, comprises transmission gap width, implementation of slit etc., specifically can be understood with reference to prior art, and therefore not to repeat here.
Or optional slit plane of reflection grating 32 is reflective plane grating, reflective plane grating has the first transmission gap, and reflective plane grating is positioned at the image planes position of preset lens.The effect of directly opening a transmission gap on reflective plane grating and reach slit, realizes slit and grating integrated design.
Optionally, the first transmission gap 3221 or the second transmission gap 3211 can be rectilinear slot.Or the first transmission gap 3221 or the second transmission gap 3211 can be curved slot, concrete, the slit of slight curvature can be selected in gap, eliminates spectrum smile distortion.Those skilled in the art can design rectilinear slot or curved slot according to the characteristic of optical system, and therefore not to repeat here.
Optionally, reflective plane grating 32 can comprise blazed grating or non-blazed grating.
Optionally, collimating mirror 33 can comprise spherical mirror or aspheric mirror.
Those skilled in the art can understand preset lens with reference to prior art, and therefore not to repeat here.
It will be understood by those skilled in the art that the optical spectrum imagers of the embodiment of the present invention based on plane grating light splitting can be suitable for different spectral ranges, as visible ray, near infrared, short-wave infrared etc.The optical spectrum imagers of the embodiment of the present invention based on plane grating light splitting can adopt dissimilar image detector etc., unrestricted.
Still as shown in Figure 3, the light path principle of the optical spectrum imagers of the embodiment of the present invention based on plane grating light splitting explanation:
The light that target is sent, after preset lens 31, and pools picture in image planes position;
Target converges light after the slit 321 of image planes position, becomes line target from Area Objects;
Line target converges light after collimating mirror 33, becomes collimated light, and is reflected back reflection grating 322;
Collimated light is after reflection grating 322 light splitting, and its reflected light is a series of collimated monochromatic lights of being opened by dispersion, and light path is turned back after reflection, arrives imaging lens 34;
Collimated monochromatic light is after imaging lens 34, in detector 35 imagings.
The optical spectrum imagers of the embodiment of the present invention based on plane grating light splitting is compared with the grating spectrograph imaging device system of existing thin-and-long structural plan, adopt optical grating reflection to realize turning back of light path, thereby realize the compact conformation of system, reflection grating light splitting is combined with slit, utilize in the middle of reflection grating transmission slit is set, realize the restriction of visual field, meet the requirement of slit light spectrum image-forming, reduce the optical element of system, improved the integrated degree of system.Final system can realize miniaturization and lightweight.
In addition, the optical spectrum imagers of the embodiment of the present invention based on plane grating light splitting is with compared with curved surface grating optical spectrum imagers, and all optical elements all adopt coaxial design, and the same implementation structure compactness of system and lightweight, develop simultaneously and realize difficulty and greatly reduce.
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 (7)
1. the optical spectrum imagers based on plane grating light splitting, is characterized in that, comprises preset lens, has slit plane of reflection grating, collimating mirror, imaging lens and the detector in transmission gap:
The light that target is sent converges in image planes position through described preset lens, converge light behind the transmission gap of described slit plane of reflection grating, return described slit plane of reflection grating through described collimating mirror back reflection, after described slit plane of reflection grating beam splitting, arrive described imaging lens, after described imaging lens converges at described detector image-forming.
2. the optical spectrum imagers based on plane grating light splitting according to claim 1, it is characterized in that, described slit plane of reflection grating comprises slit and reflective plane grating, described reflective plane grating has the first transmission gap, described slit has the second transmission gap, the width in the corresponding described second transmission gap of width in described the first transmission gap, described slit is positioned at the image planes position of described preset lens.
3. the optical spectrum imagers based on plane grating light splitting according to claim 2, is characterized in that, described slit and described reflective plane grating are bonded in one.
4. the optical spectrum imagers based on plane grating light splitting according to claim 1, it is characterized in that, described slit plane of reflection grating is reflective plane grating, described reflective plane grating has the first transmission gap, and described reflective plane grating is positioned at the image planes position of described preset lens.
5. according to the optical spectrum imagers based on plane grating light splitting described in claim 2 or 3 or 4, it is characterized in that, described the first transmission gap or described the second transmission gap are rectilinear slot or curved slot.
6. according to the optical spectrum imagers based on plane grating light splitting described in claim 2 or 3 or 4, it is characterized in that, reflective plane grating comprises blazed grating or non-blazed grating.
7. the optical spectrum imagers based on plane grating light splitting according to claim 1, is characterized in that, described collimating mirror comprises spherical mirror or aspheric mirror.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105628200A (en) * | 2015-12-24 | 2016-06-01 | 南京理工大学 | Computational spectral imaging device |
| CN106441579A (en) * | 2016-07-28 | 2017-02-22 | 中国工程物理研究院应用电子学研究所 | Spatial diffraction spectral imaging device for semiconductor laser array |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040057049A1 (en) * | 2002-09-20 | 2004-03-25 | Applied Photonics Worldwide, Inc. | Micromechanical monochromator with integrated slit aperture for microspectrometers in the UV, visible and infrared range |
| US20040090623A1 (en) * | 2002-11-07 | 2004-05-13 | Isaac Richman | Hyperspectral imager |
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- 2014-03-05 CN CN201410079468.4A patent/CN103837233B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040057049A1 (en) * | 2002-09-20 | 2004-03-25 | Applied Photonics Worldwide, Inc. | Micromechanical monochromator with integrated slit aperture for microspectrometers in the UV, visible and infrared range |
| US20040090623A1 (en) * | 2002-11-07 | 2004-05-13 | Isaac Richman | Hyperspectral imager |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105628200A (en) * | 2015-12-24 | 2016-06-01 | 南京理工大学 | Computational spectral imaging device |
| CN105628200B (en) * | 2015-12-24 | 2017-08-04 | 南京理工大学 | Calculate optical spectrum imaging device |
| CN106441579A (en) * | 2016-07-28 | 2017-02-22 | 中国工程物理研究院应用电子学研究所 | Spatial diffraction spectral imaging device for semiconductor laser array |
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| CN103837233B (en) | 2016-05-18 |
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