CN102141440A - High-resolution micro broad-spectrum reflective optical system for spectrograph - Google Patents
High-resolution micro broad-spectrum reflective optical system for spectrograph Download PDFInfo
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- CN102141440A CN102141440A CN 201010613585 CN201010613585A CN102141440A CN 102141440 A CN102141440 A CN 102141440A CN 201010613585 CN201010613585 CN 201010613585 CN 201010613585 A CN201010613585 A CN 201010613585A CN 102141440 A CN102141440 A CN 102141440A
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Abstract
The invention discloses a high-resolution micro broad-spectrum reflective optical system for a spectrograph, which relates to the field of optical analytical instruments and solves the problems of low spectral resolution capacity, low optical energy transfer efficiency and complex instrument processing, installation and debugging of the instrument having the conventional optical system. The system of the invention comprises an optical fiber interface, a slit, a collimator objective, an imaging objective, a detector image surface, a planar reflection grating and a rotating platform, wherein the planar reflection grating is arranged on the rotating platform, a sample light source is coupled to the optical fiber interface and projected into the collimator objective from the slit; the parallel light beam emitted by the light source and transmitted out from the collimator objective is projected to the planar reflection grating and reflected to the imaging objective; the light beam transmitted out from the imaging objective is imaged onto the detector image surface to form an image signal, and the spectral absorption components of the sample light source can be analyzed; and the collimator objective and the imaging objective are spherical reflector. The system can be widely used in portable spectrograph for field geological and hydrologic survey and military reconnaissance.
Description
Technical field
The present invention relates to the optic analytical instrument field, be specifically related to a kind of high-resolution, microminiature, wide spectral reflectance formula grating spectrograph optical system.
Background technology
Mini optical fibre spectrometer has the not available advantage of many large-scale spectrometers, as in light weight, volume is little, speed of detection is fast, easy to use, integrability, can make in batches and with low cost etc., can be applied in fields such as laboratory physicochemical analysis, clinical medical inspection, industrial process monitoring, Aero-Space remote sensing.
The microminaturization of its structure of spectral instrument has at present often caused following three problems: the one, and the instrument performance index is relatively poor, mainly is spectrally resolved power; The 2nd, the luminous energy transmission efficiency is lower; The 3rd, processing and debug complexity, difficulty is bigger, causes cost higher and can't realize that integrated mixing is integrated.
At present, the prior art approaching with the present invention is disclosed Chinese invention patent on May 28th, 2008, its patent name is " broad spectrum high resolution micro spectrometer ", the patent No. is 200710093178.5, the structure of this broad spectrum high resolution micro spectrometer as shown in Figure 1: it is made up of first slit 1, second slit 2, first plane mirror 3, second plane mirror 4, first concave reflection grating 5, second concave reflection grating 6 and photodetector 7; This optical system reaches closed first slit 1 and second slit 2 by control circuit, realizes having only one road light to enter optical system, thereby different-waveband is carried out beam split.This mentality of designing that the spectrometer system different-waveband is carried out the multi-pass beam split, though can realize wide spectral range, but still have the following disadvantages: one, the miniaturization for spectrometer does not have benefit; Two, in imaging system, adopt the monolithic concave reflection grating, limited for the calibration capability of aberration, be difficult to the resolution that reaches higher; Three, since system complicated increase greatly for the processing of element and the difficulty of debuging; Four, owing to light source descends greatly through its capacity usage ratio of beam split.
Summary of the invention
The present invention is poor for the spectrally resolved power that solves existing optical system instrument, the luminous energy transmission efficiency is low and complicated problems is debug in instrument processing, and a kind of high-resolution, microminiature, wide spectral reflectance formula spectrometer optical system are provided.
High-resolution, microminiature, wide spectral reflectance formula spectrometer optical system, this system comprises optical fiber interface, slit, collimator objective, image-forming objective lens and detector image planes; It also comprises plane reflection grating and rotatable platform, described plane reflection grating is installed on the rotatable platform, the sample light source is incident to collimator objective through slit after being coupled to optical fiber interface, described light source is incident to plane reflection grating back reflection to image-forming objective lens through the parallel beam of collimator objective outgoing, light beam imaging behind described image-forming objective lens forms picture signal, the spectral absorption composition of analytic sample light source to detector image planes place; Described collimator objective and image-forming objective lens are spherical reflector.
Principle of work of the present invention: high-resolution of the present invention, microminiature, wide spectral reflectance formula spectrometer optical system adopt the reflective structure form, process sample and the light source coupled into optical fibres of carrying the material spectral information, shine on the collimator objective through slit, the parallel rays of outgoing shines the plane reflection grating, and reflexing to image-forming objective lens, image-forming objective lens arrives detector image planes place with image formation by rays.System of the present invention realized from ultraviolet to infrared wide spectral range, by the angle of rotatable platform rotational plane reflection grating at meridian direction, thereby adjust the incident angle of collimated ray on the plane reflection grating and the angle of diffraction of diffracted ray, realized the spectrum service band of broad.Described system is adjusted to the meridianal image surface place with focal plane position, makes system's astigmatism amount in the meridian direction minimum, and then makes imaging spectral line size (being the spectral line orientation) width minimum on meridian direction, helps the resolution between the different spectrum segments.Described system is placed on the plane reflection grating to spherical reflector distance during for 0.423R, described R is a curvature radius of spherical reflector, and the system meridianal curvature of field of making is zero, and then the disc of confusion minimum that the imaging spectral line is formed on detector, grazing is best, has increased the resolving power of spectrometer.Collimator objective of the present invention adopts the identical spherical reflector of curvature with image-forming objective lens, just adopted different bores, make the processing of collimator objective and image-forming objective lens and debug easier realization, the plane reflection grating changes the spectrum of realization broad as beam splitter by the angle of plane grating meridian direction.
Beneficial effect of the present invention: optical system volume of the present invention is little, in light weight; Realize wide spectral range by changing the grating angle; The secondary diffraction has effectively been avoided in the use of two concave spherical mirrors, good restraining parasitic light; Structure arrangement is reasonable, has realized higher resolution; System of the present invention obtains wide spectral range, high resolution, and the machining tolerance of simultaneity factor is wide.
Description of drawings
Fig. 1 is the structural representation of existing optical system;
Fig. 2 is the structural representation of high-resolution of the present invention, microminiature, wide spectral reflectance formula spectrometer optical system.
Among the figure: 1, first slit, 2, second slit, 3, first plane mirror, 4, second plane mirror, 5, first concave reflection grating, 6, second concave reflection grating, 7, photodetector, 8, optical fiber interface, 9, slit, 10, collimator objective, 11, plane reflection grating, 12, rotatable platform, 13, image-forming objective lens, 14, the detector image planes.
Embodiment
Embodiment one, present embodiment is described in conjunction with Fig. 2, high-resolution, microminiature, wide spectral reflectance formula spectrometer optical system, this system comprises that this system comprises optical fiber interface 8, slit 9, collimator objective 10, image-forming objective lens 13 and detector image planes 14; It also comprises plane reflection grating 11 and rotatable platform 12, described plane reflection grating 11 is installed on the rotatable platform 12, the sample light source is incident to collimator objective 10 through slit 9 after being coupled to optical fiber interface 8, described light source is incident to plane reflection grating 11 back reflections to image-forming objective lens 13 through the parallel beam of collimator objective 10 outgoing, light beam imaging behind described image-forming objective lens 13 forms picture signal, the spectral absorption composition of analytic sample light source to detector image planes 14 places; Described collimator objective 10 and image-forming objective lens 13 are spherical reflector.
Described collimator objective 10 of present embodiment and image-forming objective lens 13 are the concave spherical mirror that radius same curvature center overlaps, the parasitic light background of effectively having avoided the secondary diffraction to be brought; Be convenient to the processing of catoptron and debug, make system have the tolerance range of broad;
Present embodiment is installed in plane reflection grating 11 on the rotatable platform 12, adjusts for the incident light of different-waveband, realizes wide spectral range;
Optical system of the present invention adopts complete symmetrical structure, and the coma of system is well controlled, and is almost nil; The present invention realize from ultraviolet to infrared wide spectrum, described optical system is that volume is little, and is simple in structure, tolerance range broad, and can obtain the spectrometer optical system of high-resolution.The present invention is particularly suitable for being applied in fields such as laboratory physicochemical analysis, clinical medical inspection, industrial process monitoring, Aero-Space remote sensing.
Claims (3)
1. high-resolution, microminiature, wide spectral reflectance formula spectrometer optical system, this system comprises optical fiber interface (8), slit (9), collimator objective (10), image-forming objective lens (13) and detector image planes (14); It is characterized in that, it also comprises plane reflection grating (11) and rotatable platform (12), described plane reflection grating (11) is installed on the rotatable platform (12), the sample light source is incident to collimator objective (10) through slit (9) after being coupled to optical fiber interface (8), described light source is incident to plane reflection grating (11) back reflection to image-forming objective lens (13) through the parallel beam of collimator objective (10) outgoing, light beam imaging behind described image-forming objective lens (13) locates to form picture signal to detector image planes (14), the spectral absorption composition of analytic sample light source; Described collimator objective (10) and image-forming objective lens (13) are spherical reflector.
2. high-resolution according to claim 1, microminiature, wide spectral reflectance formula spectrometer optical system is characterized in that, described collimator objective (10) is the concave spherical mirror that radius is identical, the center of curvature overlaps with image-forming objective lens (13).
3. high-resolution according to claim 1, microminiature, wide spectral reflectance formula spectrometer optical system is characterized in that, the service band of this system is ultraviolet, visible, near infrared and middle-infrared band scope.
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| CN 201010613585 CN102141440A (en) | 2010-12-30 | 2010-12-30 | High-resolution micro broad-spectrum reflective optical system for spectrograph |
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| CN 201010613585 CN102141440A (en) | 2010-12-30 | 2010-12-30 | High-resolution micro broad-spectrum reflective optical system for spectrograph |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013107064A1 (en) * | 2012-01-19 | 2013-07-25 | 杭州远方光电信息有限公司 | Low stray light polychromator |
| CN104502286A (en) * | 2014-12-25 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | Tandem grating dispersion imaging spectrometer |
| CN108106729A (en) * | 2017-12-01 | 2018-06-01 | 中国科学院长春光学精密机械与物理研究所 | A kind of common CCD spectrometers of double grating |
| CN109000591A (en) * | 2018-06-26 | 2018-12-14 | 中国科学院苏州生物医学工程技术研究所 | A kind of bias difference measuring instrument |
| CN110178005A (en) * | 2017-01-20 | 2019-08-27 | 株式会社理光 | Optical splitter, analytical equipment and Wavelength variable light source |
| CN114062304A (en) * | 2021-08-04 | 2022-02-18 | 哈尔滨工业大学 | Miniature diffuse reflection spectrum measurement system based on smart phone |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158636A (en) * | 2007-11-22 | 2008-04-09 | 中国科学院力学研究所 | Optical fiber spectrometer wavelength calibration method |
| CN101187628A (en) * | 2007-12-19 | 2008-05-28 | 重庆大学 | Broad spectrum high resolution micro spectrometer |
-
2010
- 2010-12-30 CN CN 201010613585 patent/CN102141440A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101158636A (en) * | 2007-11-22 | 2008-04-09 | 中国科学院力学研究所 | Optical fiber spectrometer wavelength calibration method |
| CN101187628A (en) * | 2007-12-19 | 2008-05-28 | 重庆大学 | Broad spectrum high resolution micro spectrometer |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013107064A1 (en) * | 2012-01-19 | 2013-07-25 | 杭州远方光电信息有限公司 | Low stray light polychromator |
| CN104502286A (en) * | 2014-12-25 | 2015-04-08 | 中国科学院长春光学精密机械与物理研究所 | Tandem grating dispersion imaging spectrometer |
| CN110178005A (en) * | 2017-01-20 | 2019-08-27 | 株式会社理光 | Optical splitter, analytical equipment and Wavelength variable light source |
| CN108106729A (en) * | 2017-12-01 | 2018-06-01 | 中国科学院长春光学精密机械与物理研究所 | A kind of common CCD spectrometers of double grating |
| CN109000591A (en) * | 2018-06-26 | 2018-12-14 | 中国科学院苏州生物医学工程技术研究所 | A kind of bias difference measuring instrument |
| CN114062304A (en) * | 2021-08-04 | 2022-02-18 | 哈尔滨工业大学 | Miniature diffuse reflection spectrum measurement system based on smart phone |
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Application publication date: 20110803 |