CN104483018A - Light path structure of small asymmetric high-spectrum-resolution grating monochromator - Google Patents
Light path structure of small asymmetric high-spectrum-resolution grating monochromator Download PDFInfo
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- CN104483018A CN104483018A CN201410819995.4A CN201410819995A CN104483018A CN 104483018 A CN104483018 A CN 104483018A CN 201410819995 A CN201410819995 A CN 201410819995A CN 104483018 A CN104483018 A CN 104483018A
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Abstract
The invention discloses a light path structure of a small asymmetric high-spectrum-resolution grating monochromator, and belongs to the technical field of spectral analyzers. The structure comprises an entrance slit, a collimator objective, a plane grating, a convergence objective, a turning reflector, an exit slit and a rotary table, wherein light beam sent by the entrance slit is irradiated to the collimator objective for collimation and is dispersed and split by the plane grating after collimated, the dispersed light beam is converged by the convergence objective and focused to the exit slit after the light path is turned by the turning reflector, and accordingly, collimated monochromatic light is obtained; and the plane grating is fixed on the rotary table, and monochromatic light with different wavelengths is output at the exit slit by rotating the grating through the rotary table. The system structure is compact, the size is small, the weight is light, and processing, assembling and calibration are simple; the convergence objective can obtain a longer focal length, so that spectrum line dispersion of the monochromator is remarkably improved; and the light path is folded in an instrument by the turning reflector, the size of the instrument is effectively reduced, system astigmatism can be effectively reduced, and the energy concentration ratio of emergent spectrum of the instrument is increased.
Description
Technical field
The invention belongs to spectrometric instrument technical field, relate to the light channel structure of the small-sized high spectral resolution grating monochromator of a kind of asymmetric.
Background technology
Monochromator is a kind of spectroscopic instruments being used for obtaining quasi-monochromatic light, is the basic test equipment carrying out spectral analysis and spectrum measurement, is nowadays widely used in the fields such as scientific research, production and Quality Control.
Along with the development of modern science and technology, miniaturization, lightweight, portability and high resolving power become the main trend of monochromator development gradually.Conventional monochromator adopts Czerney-Turner light channel structure, the light path of this structure is comparatively symmetrical, the collimator objective of instrument is close with the mirror focal length of imaging thing even equal, then need the focal length simultaneously increasing instrument collimator objective and image-forming objective lens to cause instrument volume to increase for improving instrumental line linear dispersion, weight increases.
Summary of the invention
In order to solve problems of the prior art, the invention provides the light channel structure of the small-sized high spectral resolution grating monochromator of a kind of asymmetric, this structure is in limited volume range, assemble object lens can obtain larger focal length thus monochromator spectral line linear dispersion is significantly improved, there is resolution high, the features such as volume is little, compact conformation.
The technical scheme that technical solution problem of the present invention adopts is as follows:
A light channel structure for the small-sized high spectral resolution grating monochromator of asymmetric, this structure comprises: entrance slit, collimator objective, plane grating, convergence object lens, exit slit and turntable, and this structure also comprises: refluxing reflection mirror; The light beam irradiation that entrance slit sends collimates in collimator objective, by plane grating dispersion light splitting after beam collimation, dispersed light beam is assembled by assembling object lens, exit slit place is focused on after refluxing reflection mirror turns back light path, thus acquisition quasi-monochromatic light, plane grating is fixed on turntable, by turntable rotational plane grating, the monochromatic light of different wave length is exported at exit slit place.
The invention has the beneficial effects as follows: present system compact conformation, volume is little, lightweight, processing and dress school simple.In limited volume range, assemble object lens and can obtain larger focal length thus monochromator spectral line linear dispersion is significantly improved.Light path folding effectively be have compressed instrument volume in instrument internal by refluxing reflection mirror, and adopts cylindrical mirror as effectively reducing system astigmatism during refluxing reflection mirror thus the encircled energy of raising instrument outgoing spectrum.
Accompanying drawing explanation
The schematic diagram of the light channel structure of the small-sized high spectral resolution grating monochromator of a kind of asymmetric of Fig. 1 the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further details.
As shown in Figure 1, the light channel structure of the small-sized high spectral resolution grating monochromator of a kind of asymmetric of the present invention, comprises entrance slit 1, collimator objective 2, plane grating 3, assembles object lens 4, refluxing reflection mirror 5, exit slit 6 and turntable 7; Collimator objective 2 and convergence object lens 4 all adopt concave spherical mirror, assemble object lens 4 focal length much larger than collimator objective focal length to improve instrumental line linear dispersion; Plane grating 3 adopts reflective planar grating; Refluxing reflection mirror 5, for light path folding being amassed in instrument internal with reduction printer body, can adopt plane mirror also can adopt cylindrical mirror (can eliminate system astigmatism); Turntable 7 exports at exit slit place to make the monochromatic light of different wave length for rotational plane grating 3.The light beam irradiation sent from entrance slit 1 is in collimator objective 2, and by plane grating 3 dispersion light splitting after beam collimation, dispersed light beam is assembled by assembling object lens 4, focuses on exit slit 6 place after refluxing reflection mirror 5 turns back light path, thus obtains quasi-monochromatic light.
Embodiment 1:
In light channel structure of the present invention, monochromator service band is 200 ~ 850nm, and object-side numerical aperture is 0.1; Collimator objective 2 and convergence object lens 4 are concave spherical mirror, and radius-of-curvature is respectively 90mm and 193mm, and off-axis angle is respectively 8 ° and 30 °, and focal length is respectively 45.2mm and 80.8mm; Plane grating 3 adopts grating constant to be the reflective ruling grating of 1/600mm; When adopting cylindrical mirror to eliminate system astigmatism as refluxing reflection mirror 5, cylindrical surface for reflection curvature radius is 294mm.
By optical design software trace, the theoretical resolution of the light channel structure of the small-sized high spectral resolution grating monochromator of a kind of asymmetric that this example is formed can reach 1nm, and light path length and width are 56mm × 47mm.
Claims (4)
1. a light channel structure for the small-sized high spectral resolution grating monochromator of asymmetric, this structure comprises: entrance slit, collimator objective, plane grating, convergence object lens, exit slit and turntable, is characterized in that, this structure also comprises: refluxing reflection mirror; The light beam irradiation that described entrance slit sends collimates in collimator objective, by plane grating dispersion light splitting after beam collimation, dispersed light beam is assembled by assembling object lens, exit slit place is focused on after refluxing reflection mirror turns back light path, thus acquisition quasi-monochromatic light, plane grating is fixed on turntable, by turntable rotational plane grating, the monochromatic light of different wave length is exported at exit slit place.
2. the light channel structure of the small-sized high spectral resolution grating monochromator of a kind of asymmetric as claimed in claim 1, is characterized in that, described collimator objective and convergence object lens are concave spherical mirror; Assemble the focal length of focal length much larger than collimator objective of object lens.
3. the light channel structure of the small-sized high spectral resolution grating monochromator of a kind of asymmetric as claimed in claim 1, is characterized in that, described plane grating is reflective planar grating.
4. the light channel structure of the small-sized high spectral resolution grating monochromator of a kind of asymmetric as claimed in claim 1, is characterized in that, described refluxing reflection mirror is cylindrical mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410819995.4A CN104483018A (en) | 2014-12-25 | 2014-12-25 | Light path structure of small asymmetric high-spectrum-resolution grating monochromator |
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| CN201410819995.4A CN104483018A (en) | 2014-12-25 | 2014-12-25 | Light path structure of small asymmetric high-spectrum-resolution grating monochromator |
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| CN201410819995.4A Pending CN104483018A (en) | 2014-12-25 | 2014-12-25 | Light path structure of small asymmetric high-spectrum-resolution grating monochromator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588363A (en) * | 2017-08-24 | 2018-01-16 | 中国电子科技集团公司第四十研究所 | The polarized monochromatic light source generation system and method for a kind of Programmable and Variable wavelength |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1373351A (en) * | 2002-04-10 | 2002-10-09 | 天津大学 | Apparatus for measuring raster angle with linear CCD array to determine wavelength |
| CN103245488A (en) * | 2013-04-02 | 2013-08-14 | 中国科学院长春光学精密机械与物理研究所 | Broadband large size plane grating diffraction efficiency tester |
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2014
- 2014-12-25 CN CN201410819995.4A patent/CN104483018A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1373351A (en) * | 2002-04-10 | 2002-10-09 | 天津大学 | Apparatus for measuring raster angle with linear CCD array to determine wavelength |
| CN103245488A (en) * | 2013-04-02 | 2013-08-14 | 中国科学院长春光学精密机械与物理研究所 | Broadband large size plane grating diffraction efficiency tester |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107588363A (en) * | 2017-08-24 | 2018-01-16 | 中国电子科技集团公司第四十研究所 | The polarized monochromatic light source generation system and method for a kind of Programmable and Variable wavelength |
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