CN101819062A - Off-axis reflection-based import optical system - Google Patents
Off-axis reflection-based import optical system Download PDFInfo
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- CN101819062A CN101819062A CN201010169149A CN201010169149A CN101819062A CN 101819062 A CN101819062 A CN 101819062A CN 201010169149 A CN201010169149 A CN 201010169149A CN 201010169149 A CN201010169149 A CN 201010169149A CN 101819062 A CN101819062 A CN 101819062A
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Abstract
The invention discloses an off-axis reflection-based import optical system, which comprises a shell. Optical fibers outside the shell are extended into the shell; a through hole is reserved on the sidewall of the shell; a rotating shaft is extended out of the through hole; the extended-out tip of the rotating shaft is provided with a reflecting prism; an off-axis paraboloidal reflecting mirror is arranged on a reflecting light path of the reflecting prism in the shell; and the extended-in ends of the optical fibers are positioned on a focus point of the reflecting light path of the off-axis paraboloidal reflecting mirror. The off-axis reflection-based import optical system can meet requirements on the measurement of a passive differential optical absorption spectroscopy to further solve the problem of over-great image errors of the import optical system of the passive differential optical absorption spectroscopy, and can ignore the requirements on the selection of lens materials due to a reflection mode.
Description
Technical field
The present invention relates to the optical gauge field, be specially a kind of collection, converge the import optical system based on off-axis reflection of the passive differential absorption spectrometer of diffusion light of the sun.
Background technology
The method of at present more external import optical systems adopts transmission-type or coaxial reflective method that extraneous diffusion light of the sun is converged more and is coupled into optical fiber.Because the detecting light spectrum scope of passive differential absorption spectrometer is at 290～400nm, spectral resolution will be brought up to more than the 0.6nm, must guarantee to obtain enough energy and will improve measuring accuracy.Above-mentioned wave band adopts signal-lens method can inevitably bring the chromatic aberation problem, and the refractive index difference when causing scioptics owing to the wavelength difference is looking like color spot of square one-tenth, thereby reducing the coupling efficiency of optical fiber, influences the detection accuracy of spectrometer.Lens come achromatism if we adopt different materials, certainly will increase cost, also can lose certain energy and newly add eyeglass.If adopt coaxial reflective method, on achromatic problem, can be resolved, but cause central obscuration because the fixing mechanical hook-up that receives optical fiber can rise, also can lose portion of energy, thereby influence the detection efficiency of spectrometer.
Summary of the invention
The objective of the invention is for a kind of import optical system based on off-axis reflection is provided, utilize off-axis parabolic mirror to solve the excessive difficult problem of aberration that the measurement of present passive differential absorption spectrometer import optic block brings.
In order to achieve the above object, the technical solution adopted in the present invention is:
A kind of import optical system based on off-axis reflection, include the housing of sealing, housing has optical fiber one end to stretch in the housing outward, have through hole on the described housing sidewall, there is the rotating shaft that is rotatably installed in the housing from described through hole, to stretch out, be fixed with erecting frame on the termination that described rotating shaft is stretched out, reflecting prism is installed in the erecting frame, it is characterized in that: the reflected light path that is positioned at reflecting prism in the described housing is provided with off-axis parabolic mirror, the inserting end of described optical fiber is positioned on the focus of reflected light path of off-axis parabolic mirror, on diffusion light of the sun is injected off-axis parabolic mirror in the housing by described reflecting prism reflection back from described through hole, by the inserting end of off-axis parabolic mirror reflect focalization at optical fiber.
Described a kind of import optical system based on off-axis reflection is characterized in that: the described optical fiber other end inserts in the spectrometer input end, and described spectrometer output terminal is connected with industrial computer by signal wire.
Among the present invention, reflecting prism imports to diffusion light of the sun in the reception visual field of off axis reflector paraboloidal mirror, off axis paraboloidal mirror reflects scattered light and converges in the optical fiber, rotating shaft is by the motor-driven of outside, the driven by motor rotating shaft is rotated, and then drive the reflecting prism rotation, in the scattered light importing receiving system with different angles.Off axis paraboloidal mirror reflect focalization coupled into optical fibres, and connect spectrometer, finish chromatic dispersion, collection and digitizing by it and be transmitted to storage in the computing machine, calculate by the USB line, the final parsing that realizes atmospheric trace gas vertical column concentration and profile.Off-axis parabolic mirror can produce the parallel beam of high-quality no central obscuration with simple face shape, according to actual conditions determine its bore, from geometric relationships such as axle amount, focal lengths, and can calculate available fields scope.As long as the radius-of-curvature that provides clear aperture and focal length or summit of rotational symmetry paraboloid surface shape is just definite fully usually.As long as off axis paraboloid mirror provides clear aperture, goes up parameters such as focal length from axle amount, off-axis angle or axle.
Principal feature of the present invention is as follows:
(1), the method for reflective focusing, coupled fiber is applied in the import optical system of passive differential absorption spectrometer, corrected the influence of aberration to systematic survey;
(2), adopt off axis paraboloid mirror reflection mode can avoid the influence of central obscuration;
The MTF transport function of off-axis parabolic mirror of the present invention can be found, in certain spatial frequency range, have good resolution and contrast, can find that from indexs such as its aberration curves the aberration that its focused light spot produces is very little, be convenient to focus on coupled into optical fibres.Total system satisfies the demand that the passive differential absorption spectrometer is measured, and then solves the excessive problem of passive differential absorption spectrometer import optic block aberration.And, also can ignore the selection requirement of lens materials owing to adopt reflective mode.
Description of drawings
Fig. 1 is the import optical system synoptic diagram that the present invention is based on off-axis reflection.
Fig. 2 is off-axis parabolic mirror light path synoptic diagram among the present invention.
Embodiment
As shown in Figure 1 and Figure 2.A kind of import optical system based on off-axis reflection, include reflecting prism 1, the subsequent optical path of reflecting prism 1 is provided with off-axis parabolic mirror 2, optical fiber 3, diffusion light of the sun is after reflecting prism 1 turnover light path, stretch into to optical fiber 3 on the termination of housing (numerical aperture that off axis paraboloidal mirror 2 focuses on needs to be complementary with the numerical aperture of optical fiber) through off-axis parabolic mirror 2 reflect focalizations again, carry out chromatic dispersion, gather digitizing through spectrometer 4 again, calculate, resolve to industrial computer 5 at last.
Claims (2)
1. import optical system based on off-axis reflection, include the housing of sealing, housing has optical fiber one end to stretch in the housing outward, have through hole on the described housing sidewall, there is the rotating shaft that is rotatably installed in the housing from described through hole, to stretch out, be fixed with erecting frame on the termination that described rotating shaft is stretched out, reflecting prism is installed in the erecting frame, it is characterized in that: the reflected light path that is positioned at reflecting prism in the described housing is provided with off-axis parabolic mirror, the inserting end of described optical fiber is positioned on the focus of reflected light path of off-axis parabolic mirror, on diffusion light of the sun is injected off-axis parabolic mirror in the housing by described reflecting prism reflection back from described through hole, by the inserting end of off-axis parabolic mirror reflect focalization at optical fiber.
2. a kind of import optical system based on off-axis reflection according to claim 1 is characterized in that: the described optical fiber other end inserts in the spectrometer input end, and described spectrometer output terminal is connected with industrial computer by signal wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010169149A CN101819062A (en) | 2010-04-30 | 2010-04-30 | Off-axis reflection-based import optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010169149A CN101819062A (en) | 2010-04-30 | 2010-04-30 | Off-axis reflection-based import optical system |
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| Publication Number | Publication Date |
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| CN101819062A true CN101819062A (en) | 2010-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010169149A Pending CN101819062A (en) | 2010-04-30 | 2010-04-30 | Off-axis reflection-based import optical system |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778440A (en) * | 2012-08-06 | 2012-11-14 | 南京国电环保科技有限公司 | Total-reflection type optical system of flue gas concentration analyzer |
| CN104121991A (en) * | 2014-07-03 | 2014-10-29 | 清华大学 | Plasma emission spectroscopy two-dimensional space distribution measuring system |
| CN106198325A (en) * | 2016-06-27 | 2016-12-07 | 南开大学 | In a kind of on-line checking suspension molecule size distribution the measuring and analysis system of elastic scattering spectra dorsad and analyze method |
| CN107037575A (en) * | 2017-05-08 | 2017-08-11 | 北京北方群星科技发展有限公司 | A kind of off-axis reflection optical antenna and system |
| CN109520944A (en) * | 2017-09-19 | 2019-03-26 | 高利通科技（深圳）有限公司 | A kind of universal spectroscopic analysis system |
| CN112504456A (en) * | 2020-11-18 | 2021-03-16 | 天津大学 | Micro-area differential reflection type spectrum measurement system and method |
-
2010
- 2010-04-30 CN CN201010169149A patent/CN101819062A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102778440A (en) * | 2012-08-06 | 2012-11-14 | 南京国电环保科技有限公司 | Total-reflection type optical system of flue gas concentration analyzer |
| CN104121991A (en) * | 2014-07-03 | 2014-10-29 | 清华大学 | Plasma emission spectroscopy two-dimensional space distribution measuring system |
| CN104121991B (en) * | 2014-07-03 | 2016-08-24 | 清华大学 | The measurement system of plasma emission spectroscopy two-dimensional space distribution |
| CN106198325A (en) * | 2016-06-27 | 2016-12-07 | 南开大学 | In a kind of on-line checking suspension molecule size distribution the measuring and analysis system of elastic scattering spectra dorsad and analyze method |
| CN107037575A (en) * | 2017-05-08 | 2017-08-11 | 北京北方群星科技发展有限公司 | A kind of off-axis reflection optical antenna and system |
| CN109520944A (en) * | 2017-09-19 | 2019-03-26 | 高利通科技（深圳）有限公司 | A kind of universal spectroscopic analysis system |
| CN112504456A (en) * | 2020-11-18 | 2021-03-16 | 天津大学 | Micro-area differential reflection type spectrum measurement system and method |
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Open date: 20100901 |