CN2704031Y - Low parasitic light monochromator - Google Patents
Low parasitic light monochromator Download PDFInfo
- Publication number
- CN2704031Y CN2704031Y CN 03220878 CN03220878U CN2704031Y CN 2704031 Y CN2704031 Y CN 2704031Y CN 03220878 CN03220878 CN 03220878 CN 03220878 U CN03220878 U CN 03220878U CN 2704031 Y CN2704031 Y CN 2704031Y
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- Prior art keywords
- light filter
- light
- linear array
- wave
- filter
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Abstract
The utility model discloses a low parasitic light monochromator, which comprises an objective lens, a field lens, an entrance slit, a spherical mirror, a plane grating and a linear array detector, wherein, a graduated light filter or a segmented assembled light filter is installed on the surface of the linear array detector, and a band rejection attenuate light filter is arranged outside the objective lens. The graduated light filter or the segmented assembled light filter is used for decreasing stray light. The band rejection attenuate light filter can moderately decrease the wave range radiation intensity with large radiation consumption and high detector response in the entire spectral range, and the light intensities of other wave ranges are substantially not affected. Thus, the signal to noise ratio of suppressed wave ranges has no large variation, but the dynamic range of each wave range reaches a better balance. The utility model is mainly used for measuring the spectral radiance of the visible near infrared band ranges of from 350 to 1100 nm in the field and in a room.
Description
Technical field
The utility model relates to a kind of dispersion spectrum radiation measurement assembly, especially is applicable to the monochromator of the spectroradiometric measurement of visible-short-wave infrared wave band.
Background technology
For as seen-short-wave infrared wave band (350～2500nm) high-resolution spectroscopy actinometry problem, mostly adopt the chromatic dispersion light-splitting method to obtain spectral information, detector can adopt the device of unit or linear array, in the application scenario that needs obtain data fast, then need to adopt linear array silicon photo diode detector.All can there be parasitic light in various degree in the optical system of any structure.The measure that reduces parasitic light can be the optical-mechanical structure of double monochromator, but such scheme one comes cost very high, and volume weight is also bigger; Two can only be applied to the working method of single-element detector-mechanical scanning, needing to be not suitable for the occasion of measurement fast.Use the spectroradiometric measurement instrument of linear array detector, still not effective especially parasitic light is eliminated way.Use the channel-type monochromator of optical filter, can realize the low stray light design than being easier to, but can only accomplish the measurement of several fixed band.Can't realize very narrow spectral bandwidth, more can't realize continuous or quasi-continuous high spectrum test.
The utility model content
The purpose of this utility model provides a kind of improved monochromator structure, reduces the influence of parasitic light significantly, improves measuring accuracy.
The technical solution of the utility model is:
Low veiling glare monochromator includes by object lens, field lens, entrance slit, spherical mirror, plane grating, linear array detector, it is characterized in that gradual filter of linear array detector mounted on surface or sectional type combined filters.
Gradual filter or sectional type combined filters match with the grating dispersion space distribution.
The object lens outside is equipped with band resistance decay optical filter.
The linear gradient optical filter of using in the utility model is the optical interference filter of a kind of centre wavelength with optical filter length direction linear change.In application, because the beam split of grating, the length direction of array detector has been represented different wavelength.The Wavelength distribution of gradual filter is with it corresponding, but the bandwidth of gradual filter is wideer.
In actual applications, system spectrum resolution is 3nm, and the bandwidth of gradual filter is 20nm, is total to the spectral range of 700nm for 400～1100nm, suppose that spectral power distribution and stray light coefficient are uniformly, the parasitic light of system inhibition efficient can improve 35 times so.Consider that parasitic light suppresses to be primarily aimed at the influence of high-energy wave band to low-yield wave band, actual raising ability can reach more than 10 times.
The sectional type combined filters can be regarded a kind of gradual filter of broader bandwidth as, even its bandwidth is 100nm, its parasitic light suppresses ability also can improve 3～5 times.
The utility model adopts the horizontal symmetrical imaging spectrograph system of this terraced structure of Albert-method, and detector adopts the silicon photo diode linear array, and gradual filter or sectional type combined filters are used for reducing parasitic light; The band resistance decay optical filter wave band radiation intensity that emittance is big, explorer response is high in can moderate reduction overall optical spectral limit, and do not influence the light intensity of its all band basically.Like this, downtrod wave band signal to noise ratio (S/N ratio) changes little, but the dynamic range of each wave band has reached balance preferably, the signal of the weak reponse wave band of shortwave and long wave does not have too big variation simultaneously, use this technology, radiation roughly distributes and has suitable effect under the situation of (as the sun) and explorer response to known luminaire.
The utility model is mainly used in open-air and indoor Visible-to-Near InfaRed wave band (350～1100nm) spectroradiometric measurement.
Description of drawings
Fig. 1 is the utility model optical texture synoptic diagram.
Fig. 2 is the original measurement curve of spectrum.
Embodiment
Referring to accompanying drawing 1,2.
The utility model includes by object lens 2, field lens 3, entrance slit 4, spherical mirror 5, plane grating 6, linear array detector 8, gradual filter of linear array detector 8 mounted on surface or sectional type combined filters 7.Gradual filter or sectional type combined filters 7 match with grating 6 chromatic dispersion space distributions.Object lens 2 outsides are equipped with band resistance decay optical filter 1.
The optical radiation of target decays via the band resistance behind the optical filter 1, by object lens 2, field lens 3, image in entrance slit 4, be directional light as coloured light through spherical mirror 5 reflection collimations, project plane grating 6, the monochromatic light of each wavelength after the grating dispersion is imaged onto on each unit of linear array detector 8 through spherical mirror 5 reflections, gradual filter or sectional type combined filters 7 again.
The utility model system spectrum resolution is 3nm, and the bandwidth of gradual filter is 20nm, and sectional type combined filters bandwidth is 100nm.
The original measurement curve of spectrum shown in Figure 2, reality is the comprehensive response of other system spectral transfer function such as the sun (light source) spectrum, detector spectrum are corresponding, optical system spectrum efficiency, as can be seen, at 500～600nm wave band, system's output is maximum, and at long wave and shortwave, system's output has only 1/10 of maximum output.Simultaneously, because energy distribution and explorer response, middle wave band is also big for the stray light of long wave and skip band.
The utility model band resistance decay optical filter, can decay the projectile energy of 500～600nm wave band more than 50%, and the transmitance of weak energy wave band is about 90%, substantially unattenuated, make the measurement dynamic range of instrument increase by one times like this, simultaneously also the wave band of this stray light maximum has been reduced by one times to the stray light coefficient of weak energy wave band, whole parasitic light suppresses ability and can improve more than 30%.
Claims (3)
1, low veiling glare monochromator includes by object lens, field lens, entrance slit, spherical mirror, plane grating, linear array detector, it is characterized in that gradual filter of linear array detector mounted on surface or sectional type combined filters.
2, low veiling glare monochromator according to claim 1 is characterized in that gradual filter or sectional type combined filters match with the grating dispersion space distribution.
3, low veiling glare monochromator according to claim 1 is characterized in that the object lens outside is equipped with band resistance decay optical filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03220878 CN2704031Y (en) | 2003-03-31 | 2003-03-31 | Low parasitic light monochromator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03220878 CN2704031Y (en) | 2003-03-31 | 2003-03-31 | Low parasitic light monochromator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2704031Y true CN2704031Y (en) | 2005-06-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03220878 Expired - Fee Related CN2704031Y (en) | 2003-03-31 | 2003-03-31 | Low parasitic light monochromator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2704031Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858785A (en) * | 2010-06-12 | 2010-10-13 | 北京农业智能装备技术研究中心 | Device for improving spectral quality of micro-spectrometer |
| CN102538962A (en) * | 2012-01-19 | 2012-07-04 | 杭州远方光电信息股份有限公司 | Low stray light polychromator |
| CN101813519B (en) * | 2010-02-02 | 2013-04-03 | 杭州远方光电信息股份有限公司 | Stray light correction method of spectrograph |
| CN104155000A (en) * | 2014-08-21 | 2014-11-19 | 中国科学院光电研究院 | Linearity gradual change optical filter type multispectral imaging instrument based on secondary imaging |
| CN105067573A (en) * | 2015-09-02 | 2015-11-18 | 盐城工业职业技术学院 | Testing device for photosensitive color-changing fabric |
| CN105973468A (en) * | 2016-05-05 | 2016-09-28 | 中国科学院合肥物质科学研究院 | Visible near-infrared band high precision solar irradiance meter |
-
2003
- 2003-03-31 CN CN 03220878 patent/CN2704031Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101813519B (en) * | 2010-02-02 | 2013-04-03 | 杭州远方光电信息股份有限公司 | Stray light correction method of spectrograph |
| CN101858785A (en) * | 2010-06-12 | 2010-10-13 | 北京农业智能装备技术研究中心 | Device for improving spectral quality of micro-spectrometer |
| CN102538962A (en) * | 2012-01-19 | 2012-07-04 | 杭州远方光电信息股份有限公司 | Low stray light polychromator |
| CN102538962B (en) * | 2012-01-19 | 2015-11-18 | 杭州远方光电信息股份有限公司 | A kind of low stray light polychromator |
| CN104155000A (en) * | 2014-08-21 | 2014-11-19 | 中国科学院光电研究院 | Linearity gradual change optical filter type multispectral imaging instrument based on secondary imaging |
| CN105067573A (en) * | 2015-09-02 | 2015-11-18 | 盐城工业职业技术学院 | Testing device for photosensitive color-changing fabric |
| CN105973468A (en) * | 2016-05-05 | 2016-09-28 | 中国科学院合肥物质科学研究院 | Visible near-infrared band high precision solar irradiance meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |