CN103196555B - Be applied to the spectrum programmable light-source system of ultraphotic spectrum calibration - Google Patents
Be applied to the spectrum programmable light-source system of ultraphotic spectrum calibration Download PDFInfo
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- CN103196555B CN103196555B CN201310081668.9A CN201310081668A CN103196555B CN 103196555 B CN103196555 B CN 103196555B CN 201310081668 A CN201310081668 A CN 201310081668A CN 103196555 B CN103196555 B CN 103196555B
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Abstract
The invention discloses a kind of spectrum programmable light-source system being applied to ultraphotic spectrum calibration, comprise light source, the front light path of light source is placed with optical filter successively, colimated light system, post Lens Coupling system, slit, collimator objective, dispersion element, the front light path of dispersion element is provided with imaging system successively, Digital Micromirror Device, the light path that having after Digital Micromirror Device modulation is used up is provided with light collecting lens successively, fiber coupler, fiber coupler connects integrating sphere, integrating sphere is provided with spectroradiometer, by spectral simulation program and supervision spectroradiometer, carry out FEEDBACK CONTROL, simulate target optical spectrum, the light path of the rubbish light after Digital Micromirror Device modulation is provided with focusing system, rubbish light collector successively, and rubbish light is eliminated.The present invention can accurate analog target optical spectrum, reduces scaling light source spectrum and the non-matching impact on the calibration results of target optical spectrum; The present invention carries out precisive to radiant quantity, is conducive to the light radiation scaling precision improving sensor.
Description
Technical field
The invention belongs to light radiation scaling field calibration instrument, be specifically used as the scaling light source of super spectral remote sensing class, biomedical class Photodetection system.
Background technology
In light radiation scaling field, calibrating the light source that all kinds of photoelectric detection equipment often uses is integrating sphere light source, integrating sphere light source generally uses bromine tungsten filament lamp, xenon lamp etc. as luminescence medium, this kind of light source works is under the pattern of wide spectrum, the spectral fine structure of light source is not mated with the spectral fine structure of scaled instrument institute observed object, the precision of impact calibration.Use based on the integrating sphere light source of the luminescence mediums such as LED, can the simulation of realize target spectrum, but in super spectrum of use, be limited to the restriction of LED kind and spectral bandwidth, have much room for improvement in the fine structure of simulated target spectrum.
Traditional integrating sphere light source, under being operated in the pattern of wide spectrum, the radiometric quantities of integrating sphere light source, need to use lamp plate system to carry out standard transmission, its primary criteria traces standard blackbody, this standard delivery methods uncertainty greatly about 1% ~ 5% magnitude.The standard delivery methods that precision is higher traces low temperature absolute radiometer, based on the transmission method of standard detector, can effectively reduce calibration uncertainty, but require that light source carries out radiometric quantities under monochromatic mode.
Summary of the invention
The object of the invention is exactly the defect in order to overcome prior art, provides one can simulated target spectrum accurately and fast, and the radiant quantity of light source can precisive, is applicable to the ultraphotic spectrum spectrum programmable scaling light source system of super spectrum of use.
The present invention is achieved by the following technical solutions:
Be applied to the spectrum programmable light-source system of ultraphotic spectrum calibration, it is characterized in that: comprise light source, the front light path of light source is placed with colimated light system successively, collimator objective, dispersion element, light incident side and the light exit side of colimated light system are respectively equipped with optical filter, post Lens Coupling system, post Lens Coupling system rear is provided with slit, slit is located at the focus in object space place of collimator objective, the front light path of dispersion element is provided with imaging system successively, Digital Micromirror Device (DMD), the light path that having after Digital Micromirror Device modulation is used up is provided with light collecting lens successively, fiber coupler, fiber coupler connects integrating sphere, integrating sphere is provided with spectroradiometer, the light path of the rubbish light after Digital Micromirror Device modulation is provided with focusing system successively, rubbish light collector, the light that light source sends mating plate after filtration, select the service band needed for user, through colimated light system and post Lens Coupling system back lighting slit, from the light of slit outgoing after collimator objective collimation again through dispersion element thereafter, imaging system, be imaged on to spectral in Digital Micromirror Device, through the spatial light modulation of Digital Micromirror Device, wavelength needed for selection and strength information, through useful light collecting system and fiber coupler, import in integrating sphere, integrating sphere is installed and monitors spectroradiometer, by spectral simulation program and supervision spectroradiometer, carry out FEEDBACK CONTROL, simulate target optical spectrum, rubbish light is eliminated through rubbish light collector.Tested instrument is aimed at integrating sphere outlet and is calibrated.
The described spectrum programmable light-source system being applied to ultraphotic spectrum calibration, is characterized in that: described light source adopts the broadband light sources such as bromine tungsten filament lamp, xenon lamp, white light laser.
The described spectrum programmable light-source system being applied to ultraphotic spectrum calibration, is characterized in that: described slit is replaceable, slit breadth extreme 0.5mm, takes into account in different application, EO-1 hyperion simulation accuracy or high light flux requirement.
The described spectrum programmable light-source system being applied to ultraphotic spectrum calibration, is characterized in that: described collimator objective is transmissive system, and diaphragm is external, totally 6 lens, and use three kinds of optical glass materials altogether, camera lens is apochromatism within the scope of 400 ~ 1000nm.
The described spectrum programmable light-source system being applied to ultraphotic spectrum calibration, is characterized in that: described dispersion element adopts prism, and prism is operated in Minimum deviation angle.
The described spectrum programmable light-source system being applied to ultraphotic spectrum calibration, is characterized in that: the imaging lens of described imaging system is transmissive system, totally 5 lens, three kinds of optical materials, and described in stop position and claim 4, external diaphragm overlaps.
The described spectrum programmable light-source system being applied to ultraphotic spectrum calibration, is characterized in that: described integrating sphere has three openings, an opening for collecting using up after modulation, as input port; An opening installs supervision spectroradiometer; Above-mentioned two aperture positions do not affect targeting device observation light-emitting window, and the 3rd opening is used as light-emitting window, provides uniform area light source.
The described spectrum programmable light-source system being applied to ultraphotic spectrum calibration, is characterized in that: described rubbish light collector is cavity shape structure, and built-in vertebra, black anodizing process is carried out on surface.
Described Digital Micromirror Device, uses the commercialization Digital Micromirror Device (DMD) that TI company produces, under DMD can be operated in three kinds of states: "ON", "Off" and " putting down " state, for the reflective modulation of spatial light.
Advantage of the present invention is:
According to the principle of spectrometer, utilize dispersion element, realize Subsection spectrum, by means of DMD modulation function and spectral simulation algorithm flexibly, the simulation of realize target spectrum.System spectrum resolution is higher, and spectral simulation accuracy is higher, and spectral fine structure simulation is more accurate, is conducive to reducing in calibration process, the uncertainty of the non-matching introducing of spectrum.On the other hand, described light-source system, under can being operated in (standard) monochromatic mode, by means of tracing low temperature absolute radiometer, based on the standard delivery methods of standard detector, can carry out radiometric quantities to light source exactly, is conducive to improving calibration precision.
Accompanying drawing explanation
Fig. 1 is fundamental diagram of the present invention.
Fig. 2 is spectral simulation algorithm flow chart of the present invention.
Embodiment
The spectrum programmable light-source system being applied to ultraphotic spectrum calibration is a kind of spectrum tunable light source system based on spatial light modulator, the novel scaling light source of one designed mainly for the high precision scaling requirements of super spectral remote sensing class, biomedical class Photodetection system.Systematic schematic diagram of the present invention is shown in Fig. 1.
In the present invention, broadband light source 1, after filtration mating plate 2, the spectral band needed for acquisition.By broadband light source after colimated light system 3 collimates, then focused on slit 5 by post lens 4.
In the present invention, the width of slit determines the spectral resolution of light-source system also directly to determine the accuracy of spectral simulation.Slit is narrower, and spectral resolution is higher, and spectral simulation is more accurate, but luminous flux also correspondingly reduces, and slit is wider, and spectral resolution is lower, the corresponding reduction of spectral simulation accuracy, but luminous flux improves.
In the present invention, adopt the mode of replaceable slit, take into account the requirement of spectral simulation pin-point accuracy and high light flux.Slit 5 is positioned at the focus in object space place collimating thereafter camera lens 6.By the light beam of slit 5, collimate through collimation camera lens 6, throw light on dispersion element 7.In the present invention, adopt prism as dispersion element 7.Broad band collimated light beam is after prism dispersion, and co-wavelength spectral component exiting parallel, through imaging system 8 below, spectral is imaged in Digital Micromirror Device (DMD) 9, is equivalent to slit 5 spectral to be imaged on DMD9.Now, the row (column) pixel of each spectral component just on corresponding DMD9, is called that spectrum is tieed up, and the pixel of DMD above-listed (OK) just to should the intensity of spectral component, be called that intensity is tieed up.Spectrum peacekeeping intensity is tieed up to be needed to utilize high resolving power spectroradiometer to calibrate, the strength distributing information that the corresponding informance of the upper wavelength of acquisition spectrum dimension and DMD9 row (column) numbering and intensity are tieed up.Control "ON", the "Off" of spectrum dimension DMD9 pixel, realize the selection of spectral component; "ON", the "Off" pixel number of control intensity dimension DMD9 pixel, realize the high low modulation of intensity.
Useful spectral information after being modulated by DMD9, through light collecting lens 10, is directly focused on or is imported in integrating sphere 12 by fiber coupler 11.Utilize the spectral calibration information and intensity calibration information that obtain, by means of spectral simulation algorithm, simulate required spectral information, algorithm flow is shown in Fig. 2.First by target optical spectrum information input computing machine, utilize spectral simulation program A module calculate needed for wavelength information and the intensity value of correspondence, namely open which row (OK) DMD pixel, open how many individual.Utilize and monitor spectroradiometer 13 Real-time Collection spectrum, the spectrum obtained is called instantaneous spectrum, by instantaneous spectrum and target optical spectrum comparison, feeds back to spectral simulation algorithm B module, then carries out fine adjustment, until result meets the demands.After spectral simulation terminates, nonius instrument 14 undetermined aims at integrating sphere outlet, carries out light radiation scaling.
To the rubbish light of "Off" state after DMD9 modulation, focused in rubbish light collector 16 by condenser lens 15.
The radiometric quantities of light source of the present invention can use the spectroradiometer through calibration to obtain, and nonius instrument 14 undetermined aims at integrator outlet observation, utilizes the light source that this radiometric quantities is known, realizes the radiation calibration treating calibration instrument 14.
Claims (8)
1. be applied to the spectrum programmable light-source system of ultraphotic spectrum calibration, it is characterized in that: comprise light source, the front light path of light source is placed with colimated light system successively, collimator objective, dispersion element, light incident side and the light exit side of colimated light system are respectively equipped with optical filter, post Lens Coupling system, post Lens Coupling system rear is provided with slit, slit is located at the front focus place of collimator objective, the front light path of dispersion element is provided with imaging system successively, Digital Micromirror Device, the light path that having after Digital Micromirror Device modulation is used up is provided with light collecting lens successively, fiber coupler, fiber coupler connects integrating sphere, integrating sphere is provided with spectroradiometer, the light path of the rubbish light after Digital Micromirror Device modulation is provided with focusing system successively, rubbish light collector, the light that light source sends mating plate after filtration, select the service band needed for user, through colimated light system one and post Lens Coupling system back lighting slit, from the light of slit outgoing after collimator objective collimation again through dispersion element thereafter, imaging system, be imaged on to spectral in Digital Micromirror Device, through the spatial light modulation of Digital Micromirror Device, wavelength needed for selection and strength information, through useful light collecting system and fiber coupler, import in integrating sphere, integrating sphere is installed and monitors spectroradiometer, by spectral simulation program and supervision spectroradiometer, carry out FEEDBACK CONTROL, simulate target optical spectrum, rubbish light is eliminated through rubbish light collector.
2. the spectrum programmable light-source system being applied to ultraphotic spectrum calibration according to claim 1, is characterized in that: described light source adopts bromine tungsten filament lamp, xenon lamp or white light laser.
3. the spectrum programmable light-source system being applied to ultraphotic spectrum calibration according to claim 1, is characterized in that: described slit is replaceable, and slit breadth extreme 0.5mm, takes into account in different application, EO-1 hyperion simulation accuracy or high light flux requirement.
4. the spectrum programmable light-source system being applied to ultraphotic spectrum calibration according to claim 1, it is characterized in that: described collimator objective is transmissive system, and diaphragm is external, totally 6 lens, use three kinds of optical glass materials altogether, camera lens is apochromatism within the scope of 400 ~ 1000nm.
5. the spectrum programmable light-source system being applied to ultraphotic spectrum calibration according to claim 1, is characterized in that: described dispersion element adopts prism, and prism is operated in Minimum deviation angle.
6. the spectrum programmable light-source system being applied to ultraphotic spectrum calibration according to claim 1, it is characterized in that: the imaging lens of described imaging system is transmissive system, totally 5 lens, three kinds of optical materials, stop position and external diaphragm according to claim 4 overlap.
7. the spectrum programmable light-source system being applied to ultraphotic spectrum calibration according to claim 1, is characterized in that: described integrating sphere has three openings, an opening for collecting using up after modulation, as input port; An opening installs supervision spectroradiometer; Above-mentioned two aperture positions do not affect targeting device observation light-emitting window, and the 3rd opening is used as light-emitting window, provides uniform area light source.
8. the spectrum programmable light-source system being applied to ultraphotic spectrum calibration according to claim 1, is characterized in that: described rubbish light collector is cavity shape structure, and built-in vertebra, black anodizing process is carried out on surface.
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| CN105890755A (en) * | 2014-11-19 | 2016-08-24 | 中国科学院光电研究院 | Integration light source used for field calibration |
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| CN105301769B (en) * | 2015-11-23 | 2018-01-12 | 福州大学 | A kind of implementation method of the programmable light sources system based on DMD |
| CN105717086B (en) * | 2016-03-07 | 2018-03-27 | 吉林大学 | AFS light source method for controlling frequency conversion based on digital micro-mirror |
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| CN106125090B (en) * | 2016-06-16 | 2018-07-31 | 中国科学院光电研究院 | Spectral apparatus is selected in a kind of light splitting for EO-1 hyperion laser radar |
| CN106094221A (en) * | 2016-08-05 | 2016-11-09 | 苏州优谱德精密仪器科技有限公司 | A kind of excitation-light unit |
| CN108303238B (en) * | 2017-01-13 | 2019-12-03 | 北京航空航天大学 | Liquid crystal variable retarder spectrum phase postpones scaling system |
| CN107192667B (en) * | 2017-04-28 | 2023-09-01 | 中国科学院西安光学精密机械研究所 | Spectrum-adjustable light source and spectrum adjusting method thereof |
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Effective date of registration: 20200727 Address after: Room 604-605, R & D building, Hefei Institute of technology innovation, Chinese Academy of Sciences, 2666 Xiyou Road, high tech Zone, Hefei City, Anhui Province Patentee after: HEFEI ZHONGKE JIUHENG TECHNOLOGY Co.,Ltd. Address before: 230088 Dong Dao Island, Hefei, Anhui Patentee before: HEFEI INSTITUTES OF PHYSICAL SCIENCE, CHINESE ACADEMY OF SCIENCES Effective date of registration: 20200727 Address after: 230088 Dong Dao Island, Hefei, Anhui Patentee after: HEFEI INSTITUTES OF PHYSICAL SCIENCE, CHINESE ACADEMY OF SCIENCES Address before: 230031 Shushan Lake Road, Anhui, China, No. 350, No. Patentee before: Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences |