CN103438999A - Component-based transmission-type imaging spectrometer - Google Patents
Component-based transmission-type imaging spectrometer Download PDFInfo
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- CN103438999A CN103438999A CN2013103938175A CN201310393817A CN103438999A CN 103438999 A CN103438999 A CN 103438999A CN 2013103938175 A CN2013103938175 A CN 2013103938175A CN 201310393817 A CN201310393817 A CN 201310393817A CN 103438999 A CN103438999 A CN 103438999A
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Abstract
The invention provides a component-based transmission-type imaging spectrometer which is formed by sequential arrangement of a telephoto lens, a slit, a collimator objective, a transmission-type plane diffraction grating, an imaging objective and a CCD camera, wherein the telephoto lens and the collimator objective share the same optical axis, the focus of the telephoto lens and the focus of the collimator objective are both located on the slit, the slit is perpendicular to the optical axis, the width direction of the slit is consistent with the chromatic dispersion direction of the transmission-type plane diffraction grating, the transmission-type plane diffraction grating is perpendicular to the optical axis, the included angle between the imaging objective and the optical axis is set as the grating diffraction angle, and the focal plane of the CCD camera is located on the focus of the imaging objective. According to the component-based transmission-type imaging spectrometer, all components are universal optical components, the system structure is simple, influence of stray light is reduced, and difficulty and cost for installation and adjustment are reduced.
Description
Technical field
The present invention relates to the imaging spectral technology field, be specifically related to a kind of assembly type transmission-type imaging spectrometer.
Background technology
Imaging spectral technology is the combination of imaging technique and spectral technique, when obtaining target two-dimensional space information, also provides the spectral information of target, and this attribute that is evaluating objects provides foundation better.At numerous areas such as agricultural, forestry, water quality monitoring, air monitoring, ECOLOGICAL ENVIRONMENTAL MONITORING, geologic examination and urban surveys, important application and prospect are widely arranged.In recent years, be accompanied by the develop rapidly of light spectrum image-forming technology and various countries association area researchist's attention, succeeded in developing both at home and abroad and the imaging spectrometer that comes into operation of a great variety, performance differs from one another, in every field, show up prominently, structure is also different because of the difference characteristics of application scenario, and representative structure mainly contains Czerny-Turner system and Offner system.
Chinese patent application 201010585825.6 discloses a kind of " optical devices of wide waveband plane grating dispersion type imaging spectrometer ", this scheme adopts the Czerny-Turner system, using two concave mirrors respectively as collimator objective and image-forming objective lens, and the plane reflection grating of usining forms spectrum imaging system as light-splitting device.But owing to adopting the reflective optic device, tend to be subject to the impact of light leak parasitic light, be that part light does not directly enter optical system according to the beam limit set, the edge that arrives grating forms re-diffraction, like this through re-diffraction or the light beam that repeatedly diffraction makes the light of other wavelength overlap onto the outgoing wavelength that instrument sets get on, increase the parasitic light of instrument, in order to reduce the impact of parasitic light, usually needed the complicated light channel structure of design; Adopt in addition reflection device, make the optical axis of this system turn back, thereby to system structure design and debug and bring difficulty.
Cui Jicheng etc. are at " spectroscopy and spectral analysis " [J] .2012, in 32 (3) " imaging spectrometer integrated design " literary compositions of delivering, set forth with convex grating imaging spectrograph, adopt existing typical Offner light channel structure, core is to using convex grating as dispersion element, form beam splitting system by means of two concentric concave mirrors, can eliminate certain aberration, but opposite planar grating, convex grating processing and fabricating difficulty, expensive, and in the radius to element and bore have the system of specific (special) requirements, need customization elements, limited the degree of freedom of design and assembling, improved the manufacturing cost of whole system, versatility is poor, and this structure reaches concentric realization and reduces the multiple impact that differs by adjusting a plurality of reflection devices, this is difficult to realize when practical set.
Summary of the invention
The present invention is problems such as solving reflective imaging spectrum system and easily produce parasitic light and the imaging system resetting difficulty is large, the invention provides a kind of assembly type transmission-type imaging spectrometer, its all components is used the universal optical assembly, system architecture is simple, in the impact that reduces parasitic light, has reduced resetting difficulty and cost.
In order to solve the problems of the technologies described above, the invention provides a kind of assembly type transmission-type imaging spectrometer, it is characterized in that, described assembly type transmission-type imaging spectrometer is placed and is formed successively by telephotolens, slit, collimator objective, transmission-type plane diffraction grating, image-forming objective lens, CCD camera; Telephotolens and collimator objective are on same optical axis, and the focus of telephotolens and collimator objective is all on slit; Slit is perpendicular to optical axis, and the slit width direction is consistent with the dispersion direction of transmission-type plane diffraction grating; The transmission-type diffraction grating is perpendicular to optical axis; The angle of image-forming objective lens and optical axis is set to the optical grating diffraction angle; The focal plane of CCD camera is on the focus of image-forming objective lens.
Compared with prior art, its remarkable advantage is in the present invention:
The present invention is set to the transmission-type light channel structure, has reduced the remaining reflect stray light of transmission plane and the repeatedly impact of diffraction, has improved the purity of spectrum; Collimator objective used in the present invention, image-forming objective lens and plane transmission grating be common components, processing technology thereof comparative maturity, without customization, low price, debug easily; The present invention is the assembly type optical system, for telephotolens, collimator objective and image-forming objective lens except meeting certain out-of-focus special restriction that also do not have, camera lens commonly used can be used, need not customize, and can be changed according to the needs of application scenario, simple in structure, assembling and debug system are convenient, highly versatile, be applicable to the widely different occasion of the changeable spectral information of application scenarios, more traditional imaging spectrometer has the wider scope of application.
The accompanying drawing explanation
Fig. 1 is the structural representation of assembly type transmission-type imaging spectrometer of the present invention.
Fig. 2 is the low pressure mercury lamp spectrogram that uses assembly type transmission-type imaging spectrometer of the present invention to measure.
Embodiment
As shown in Figure 1, assembly type transmission-type imaging spectrometer of the present invention is placed and is formed successively by telephotolens 1, slit 2, collimator objective 3, transmission-type plane diffraction grating 4, image-forming objective lens 5, CCD camera 6; Wherein, telephotolens 1 and collimator objective 3 are on same optical axis 7, and the focus of telephotolens 1 and collimator objective 3 is all on slit 2; Slit 2 is perpendicular to optical axis 7, and slit 2 Widths are consistent with the dispersion direction of transmission-type plane diffraction grating 4; Transmission-type diffraction grating 4 is perpendicular to optical axis 7; Image-forming objective lens 5 is set to the optical grating diffraction angle with the angle of optical axis 7; The focal plane of CCD camera 6 is on the focus of image-forming objective lens 5.
During work, the reflection ray of external light source or target converges on slit 2 through telephotolens 1, light by slit 2 will become directional light after collimator objective 3 collimations, when directional light impinges perpendicularly on transmission-type plane diffraction grating 4, light beam after the diffraction light splitting arrives image-forming objective lens 5, finally converges in the spectrum picture that forms the corresponding target of slit on CCD camera 6.
Further, described telephotolens 1 can be selected dissimilar camera lens according to the difference of application scenario, as to adopt focal length be the camera lens that 50mm, aperture size are 1.4, or be the camera lens that 25mm, aperture size are 1.2 for the needs of large visual field adopt focal length.
Further, the width of described slit 2 is 20um.
Further, all can to adopt focal length be the camera lens that 25mm, aperture are 1.2 for described collimator objective 3 or image-forming objective lens 5.
Further, the incisure density of described transmission-type plane diffraction grating 4 is 300 lines per millimeters.
Further, described image-forming objective lens 5 employing focal lengths are the camera lens that 25mm, aperture size are 1.2.
Further, the resolution sizes of described CCD camera 6 is 1280*1024, and Pixel size is 5um.
The present invention, through validation trial, has obtained and has been satisfied with effect:
Fig. 2 is the low pressure mercury lamp spectrogram that uses assembly type transmission-type imaging spectrometer of the present invention to measure, can find out, imaging spectrometer of the present invention can be fully the spectral line of 577nm and 579nm separately, therefore can think approx, spectral resolution at wavelength 578nm place is 2nm, illustrates that the present invention has same high spectral resolution.
Claims (8)
1. an assembly type transmission-type imaging spectrometer, it is characterized in that, described assembly type transmission-type imaging spectrometer is placed and is formed successively by telephotolens (1), slit (2), collimator objective (3), transmission-type plane diffraction grating (4), image-forming objective lens (5), CCD camera (6); Wherein,
Described telephotolens (1) and collimator objective (3) are upper at same optical axis (7), and the focus of telephotolens (1) and collimator objective (3) is all on slit (2);
Described slit (2) is perpendicular to optical axis (7), and slit (2) Width is consistent with the dispersion direction of transmission-type plane diffraction grating (4);
Described transmission-type diffraction grating (4) is perpendicular to optical axis (7);
Described image-forming objective lens (5) is set to the optical grating diffraction angle with the angle of optical axis (7);
The focal plane of described CCD camera (6) is on the focus of image-forming objective lens (5).
2. a kind of assembly type transmission-type imaging spectrometer as claimed in claim 1, is characterized in that, it is the camera lens that 50mm, aperture size are 1.4 that described telephotolens (1) adopts focal length.
3. a kind of assembly type transmission-type imaging spectrometer as claimed in claim 1, is characterized in that, it is the camera lens that 25mm, aperture size are 1.2 that described telephotolens (1) adopts focal length.
4. a kind of assembly type transmission-type imaging spectrometer as claimed in claim 1, is characterized in that, the width of described slit (2) is 20um.
5. a kind of assembly type transmission-type imaging spectrometer as claimed in claim 1, is characterized in that, it is the camera lens that 25mm, aperture size are 1.2 that described collimator objective (3) adopts focal length.
6. a kind of assembly type transmission-type imaging spectrometer as claimed in claim 1, is characterized in that, the incisure density of described transmission-type plane diffraction grating (4) is 300 lines per millimeters.
7. a kind of assembly type transmission-type imaging spectrometer as claimed in claim 1, is characterized in that, it is the camera lens that 25mm, aperture size are 1.2 that described image-forming objective lens (5) adopts focal length.
8. a kind of assembly type transmission-type imaging spectrometer as claimed in claim 1, is characterized in that, the resolution sizes of described CCD camera (6) is 1280*1024, and Pixel size is 5um.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034419A (en) * | 2014-05-05 | 2014-09-10 | 中国科学院长春光学精密机械与物理研究所 | Imaging spectrometer system capable of correcting bending of spectral line and correction method thereof |
| CN107144349A (en) * | 2017-06-02 | 2017-09-08 | 苏州优函信息科技有限公司 | Modularization push-broom type visible ray/near infrared imaging spectrometer |
| CN108020516A (en) * | 2016-11-03 | 2018-05-11 | 中国科学院大连化学物理研究所 | Spectrometer or imaging spectrometer |
| WO2019119274A1 (en) * | 2017-12-19 | 2019-06-27 | 深圳达闼科技控股有限公司 | Spectrometer and spectrum detecting apparatus |
| CN110470613A (en) * | 2019-07-28 | 2019-11-19 | 浙江大学 | A kind of ranging Hyperspectral imager of looking in the distance that multimode detachably assembles |
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| CN101726461A (en) * | 2008-10-16 | 2010-06-09 | 索尼株式会社 | Optical measuring device |
| CN102946794A (en) * | 2010-06-22 | 2013-02-27 | 森斯派克有限公司 | Device and method for detecting and monitoring ingredients or properties of a measurement medium, in particular of physiological blood values |
| CN103134587A (en) * | 2013-01-29 | 2013-06-05 | 北京理工大学 | Spectrum light splitting imaging system light path based on volume hologram grating component light splitting |
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| US20070182962A1 (en) * | 2006-01-24 | 2007-08-09 | Bearman Gregory H | Spatial image modulation to improve performance of computed tomography imaging spectrometer |
| CN101726461A (en) * | 2008-10-16 | 2010-06-09 | 索尼株式会社 | Optical measuring device |
| CN102946794A (en) * | 2010-06-22 | 2013-02-27 | 森斯派克有限公司 | Device and method for detecting and monitoring ingredients or properties of a measurement medium, in particular of physiological blood values |
| CN103134587A (en) * | 2013-01-29 | 2013-06-05 | 北京理工大学 | Spectrum light splitting imaging system light path based on volume hologram grating component light splitting |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034419A (en) * | 2014-05-05 | 2014-09-10 | 中国科学院长春光学精密机械与物理研究所 | Imaging spectrometer system capable of correcting bending of spectral line and correction method thereof |
| CN104034419B (en) * | 2014-05-05 | 2017-04-05 | 中国科学院长春光学精密机械与物理研究所 | The imaging spectral instrument system of recoverable Spectral line bend and its bearing calibration |
| CN108020516A (en) * | 2016-11-03 | 2018-05-11 | 中国科学院大连化学物理研究所 | Spectrometer or imaging spectrometer |
| CN107144349A (en) * | 2017-06-02 | 2017-09-08 | 苏州优函信息科技有限公司 | Modularization push-broom type visible ray/near infrared imaging spectrometer |
| CN107144349B (en) * | 2017-06-02 | 2019-09-06 | 苏州优函信息科技有限公司 | Modularization push-broom type visible light/near infrared imaging spectrometer |
| WO2019119274A1 (en) * | 2017-12-19 | 2019-06-27 | 深圳达闼科技控股有限公司 | Spectrometer and spectrum detecting apparatus |
| CN110470613A (en) * | 2019-07-28 | 2019-11-19 | 浙江大学 | A kind of ranging Hyperspectral imager of looking in the distance that multimode detachably assembles |
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