CN103278237B - Device and method for optical radiation calibration - Google Patents

Device and method for optical radiation calibration Download PDF

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Publication number
CN103278237B
CN103278237B CN201310208289.1A CN201310208289A CN103278237B CN 103278237 B CN103278237 B CN 103278237B CN 201310208289 A CN201310208289 A CN 201310208289A CN 103278237 B CN103278237 B CN 103278237B
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detector
vacuum
vacuum storehouse
light source
storehouse
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CN103278237A (en
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陈坤峰
史学舜
杨乐臣
刘玉龙
李健军
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CETC 41 Institute
Anhui Institute of Optics and Fine Mechanics of CAS
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CETC 41 Institute
Anhui Institute of Optics and Fine Mechanics of CAS
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Abstract

The invention provides a device and method for optical radiation calibration. The device comprises a main optical path unit, a laser radiation stabilizing system, a vacuum system and a low-temperature radiometer. The main optical path unit comprises a light source, an optical fiber wavelength division multiplexer and a beam shaping device, and optical signals output by the light source pass through the optical fiber wavelength division multiplexer and the beam shaping device and then are input into the laser radiation stabilizing system. The laser radiation stabilizing system comprises a first translation guide rail, an ultraviolet power stabilizing system, a visible power stabilizing system and an intermediate infrared power stabilizing system. A spatial filter is arranged between the laser radiation stabilizing system and the vacuum system, and the vacuum system comprises a prober vacuum chamber and a preparation vacuum chamber. The device for the optical radiation calibration reflects responsivity of a prober in the vacuum environment and greatly improves precision of spectral radiance calibration results by the low-temperature radiometer in space application, and the low-temperature radiometer is directly used within a very wide waveband range from ultraviolet to infrared for carrying out high-precision calibration.

Description

A kind of light radiation calibrating installation and method
Technical field
The present invention relates to technical field of measurement and test, particularly a kind of light radiation calibrating installation, also relate to a kind of light radiation calibration steps.
Background technology
Light radiation is aligned in the fields such as optical radiation measurement, space remote sensing, climate monitoring and communication and plays critical effect.Low temperature radiometer is the measurement criteria that current light radiation calibration aspect precision is the highest, and it utilizes low temperature, vacuum and superconductor technology, and utilize electricity substituted principle to measure the absolute power of light radiation, its certainty of measurement reaches and is better than 10 -5the order of magnitude.
The primary criteria of the Institutions Development such as the NIST of the U.S. and the NPL of Britain using low temperature radiometer as absolute light radiation in recent years, has carried out a large amount of basic experiment research and Integration ofTechnology.Defense-related science, technology and industry photoelectron one-level measuring station has carried out in a deep going way to count primary criteria with low-temp radiating at home, take trap detector as the light radiation value transmit architectural study of Transfer Standards.
Traditional low temperature radiometer light radiation incidence window is Brewster window, and this window can eliminate the interference of containment portion veiling glare, improves the precision of light radiation calibration.But window to be unloaded from low temperature radiometer before and after each calibration, by window restoration to the duty identical with low temperature radiometer, by measuring the transmitance value having window and carry out estimation window without value during window, the measured value of experiment will be revised according to transmitance value.After window is pulled down from low temperature radiometer, it resets and there is larger difficulty, and the angle that window resets and hot spot drop point site are difficult to ensure with completely the same on low temperature radiometer; Need to regulate for each service band Brewster's angle, degree of regulation is poor.In standard transmittance process, the window transmitance of low temperature radiometer becomes the main source affecting standard transmittance process uncertainty of measurement.
At present, in ultraviolet to mid-infrared light spectral limit for the common method of light radiation calibration be, ultraviolet band carries out transmission calibration by standard lamp; Visible ray, near infrared band, carries out light radiation based on low temperature radiometer and directly calibrates; Middle-infrared band carries out transmission calibration by thermal detector or black matrix.Light radiation based on low temperature radiometer directly calibrate wave-length coverage only covering visible light near infrared band, be difficult to realize ultraviolet and directly calibrate to the light radiation of middle infrared broad spectrum scope, cause ultraviolet and middle-infrared band uncertainty very large, precision is difficult to improve.
Summary of the invention
The present invention proposes a kind of light radiation calibrating installation, for a kind of based on the high-precision wide spectral light radiometric calibration device of low temperature radiometer, solve and at present directly calibrate that wavelength band is narrow, uncertainty large based on low temperature radiometer light radiation, ultraviolet and infrared band precision be difficult to the problems such as raising.
Technical scheme of the present invention is achieved in that
A kind of light radiation calibrating installation, comprising: main optical path unit, laser emission systems stabilisation, vacuum system and low temperature radiometer; Described main optical path unit comprises light source, optical fibre wavelength division multiplexer and beam shaping, wherein, light source comprises ultraviolet source, visible near-infrared light source and mid-infrared light source, and the optical signal that light source exports is input to described laser emission systems stabilisation after optical fibre wavelength division multiplexer and beam shaping; Described laser emission systems stabilisation comprises the first translating rails, UV power systems stabilisation, visible power stablizing system and middle infrared power systems stabilisation; Spatial filter is provided with between described laser emission systems stabilisation and vacuum system; Described vacuum system comprises detector vacuum storehouse and preparation vacuum storehouse, cavity one end, detector vacuum storehouse is connected with described low temperature radiometer cavity by the first slide valve, the other end is configured with Brewster window, preparation vacuum storehouse cavity is connected with detector vacuum storehouse cavity by the second slide valve, detector vacuum storehouse is all equipped with watch window with preparation upper end, vacuum storehouse, and described detector vacuum storehouse also comprises with preparation vacuum storehouse can the precision displacement table of three-dimensional regulation and the second translating rails.
Alternatively, described second translating rails is high precision translational guide rail.
Alternatively, the quantity of described precision displacement table and the second translating rails is multiple.
Alternatively, magnesium fluoride optical glass selected by described Brewster window.
Alternatively, described low-temp radiating counts closed loop mechanical refrigeration low temperature radiometer.
Present invention also offers a kind of light radiation calibration steps, by ultraviolet source, visible near-infrared light source and mid-infrared light source output spectrum scope from ultraviolet to infrared optical signal; Adjusted by the light path of optical fibre wavelength division multiplexer to described ultraviolet source, visible near-infrared light source and mid-infrared light source, the optical signal after adjustment is input to laser emission systems stabilisation after beam shaping; UV power systems stabilisation, visible power stablizing system or middle infrared power systems stabilisation is selected according to different optical bands; Optical signal through power stability arrives vacuum system and low temperature radiometer by spatial filter; Detector to be measured is positioned in the vacuum cavity in detector vacuum storehouse, makes measured device and low temperature radiometer be in identical test environment; Detector configuration precision displacement table to be measured and high precision translational guide rail, precision displacement table can carry out three-dimensional regulation, makes detector photosurface center and beam optical axis unification; Preparation vacuum storehouse is connected by slide valve with detector vacuum storehouse, first detector is placed on when changing detector in the precision displacement table in preparation vacuum storehouse, then preparation vacuum storehouse is vacuumized, treat that vacuum reaches requirement, open slide valve, by high precision translational guide rail, detector to be measured being sent in detector vacuum storehouse, shifting out detector vacuum storehouse by measuring complete detector, send back in preparation vacuum storehouse.
The invention has the beneficial effects as follows:
(1) detector to be calibrated is made to be in high vacuum environment, ensure that measured device and low temperature radiometer are in identical measurement environment, the responsiveness under reflection vacuum working environment, closer to the ambient condition of space application, reduce uncertainty, improve the precision of light radiation calibration;
(2) both remained the advantage that Brewster window can eliminate containment portion veiling glare, turn eliminate the uncertainty of measurement that window Transmissivity measurement is introduced, this will improve the precision of low temperature radiometer to spectral radiance calibration result greatly;
(3) directly eliminate the measurement links of cavity Brewster window transmitance, make directly to utilize low temperature radiometer to carry out high-precision calibration in ultraviolet to infrared very wide wavelength band and become a reality.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of light radiation calibrating installation of the present invention;
Fig. 2 is the vacuum of detector shown in Fig. 1 storehouse, prepares the structural representation of vacuum storehouse and low temperature radiometer.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, light radiation calibrating installation of the present invention comprises main optical path unit, laser emission systems stabilisation 40, vacuum system and low temperature radiometer 2.Main optical path unit comprises light source 70, optical fibre wavelength division multiplexer 20 and beam shaping 30, and wherein, light source 70 comprises ultraviolet source 71, visible near-infrared light source 72 and mid-infrared light source 73, spectral region contain from ultraviolet until infrared.The optical signal that light source 70 exports first will through optical fibre wavelength division multiplexer 20, the effect of optical fibre wavelength division multiplexer 20 mainly solves the problem of multiple stage light source optical path adjustment, therefore, as long as optical fibre wavelength division multiplexer 20 output port and main optical path cell optic axis are adjusted, optical system for alignment again when just can avoid changing wavelength.The optical signal that optical fibre wavelength division multiplexer 20 exports, through beam shaping 30, makes optical signal reach requirement needed for experiment, is then input to laser emission systems stabilisation 40.Laser emission systems stabilisation 40 comprises translating rails 41, UV power systems stabilisation 42, visible power stablizing system 43 and middle infrared power systems stabilisation 44, for different optical bands, select different systems stabilisations, can ensure that the stability of required wavelength points laser emission in from ultraviolet to mid-infrared light spectral limit reaches 10 like this -5the order of magnitude.Light beam through power stability passes through spatial filter 50, final arrival vacuum system and low temperature radiometer 2.Vacuum system comprises detector vacuum storehouse 3 and preparation vacuum storehouse 4, and wherein, cavity one end, detector vacuum storehouse 3 is connected with low temperature radiometer 2 cavity, and the Brewster window 1 of ultraviolet to medium-wave infrared high permeability material is equipped with in other end configuration; Preparation vacuum storehouse 4 cavity is connected with detector vacuum storehouse 3 cavity.
Figure 2 shows that detector vacuum storehouse, prepare the structural representation of vacuum storehouse and low temperature radiometer.Brewster window 1 is connected with detector vacuum storehouse 3, and detector vacuum storehouse 3 is connected with low temperature radiometer 2, middle outfit slide valve 10; Detector vacuum storehouse 3 is connected by slide valve 5 with preparation vacuum storehouse 4, and detector vacuum storehouse 3 is all equipped with watch window 8 with preparation upper end, vacuum storehouse 4.
Still retain Brewster window 1 in low temperature radiometer and vacuum system, the interference of containment portion veiling glare can be eliminated, eliminate the uncertainty of measurement that window Transmissivity measurement is introduced, improve the precision of light radiation calibration.Magnesium fluoride (MgF selected by Brewster window 1 2) optical glass, ensure ultraviolet in infrared high permeability.
Low temperature radiometer 2 adopts low temperature, vacuum and superconductor technology, utilizes electricity substituted principle to measure the absolute power of light radiation.Incident light makes the temperature in low temperature radiometer 2 absorbed inside chamber raise, and block incident light after reaching thermal balance, produce same temperature rise with electrical heating, required electrical power just equals the light radiation of actual incidence.Electricity substituted measurement is the core of low temperature radiometer 2, and the electricity substituted process of closed loop mechanical refrigeration low temperature radiometer has been controlled automatically by main control computer 60.Be equipped with slide valve 10 in the middle of low temperature radiometer 2 and detector vacuum storehouse 3, the break-make at control connection place can be facilitated, ensure the high vacuum environment of low temperature radiometer 2.
Detector vacuum storehouse 3 is a kind of vacuum cavities, is positioned in vacuum cavity by detector 6 to be measured, guarantees that measured device is in identical test environment with low temperature radiometer 2, the responsiveness under reflection real operating environments.Detector 6 to be measured configures precision displacement table 7 and high precision translational guide rail 9, precision displacement table 7 can carry out three-dimensional regulation, ensure detector 6 photosurface center and beam optical axis unification, the quantity of precision displacement table 7 and high precision translational guide rail 9 can be multiple, and the structure in Fig. 2 is only schematic.Preparation vacuum storehouse 4 is connected by slide valve 5 with detector vacuum storehouse 3, first detector is placed on when changing detector in the precision displacement table 7 in preparation vacuum storehouse 4, then preparation vacuum storehouse 4 is vacuumized, treat that vacuum reaches requirement, open slide valve 5, by high precision translational guide rail 9, detector 6 to be measured being sent in detector vacuum storehouse 3, shifting out detector vacuum storehouse 3 by measuring complete detector, send back in preparation vacuum storehouse 4.The high vacuum environment in tamper detection device vacuum storehouse 3 can be avoided by preparation vacuum storehouse 4, reduce the time vacuumized, the efficiency and precision of light radiation calibration can be improved.Detector vacuum storehouse 3 and preparation vacuum storehouse 4 select vacuum pump set to vacuumize, and vacuum pump set adopts molecular pump unit and ionic pump combination, guarantees the condition of high vacuum degree of light radiation calibrating installation.Control in light radiation calibrating installation is realized by main control computer 60, such as, control the automatic control component in translating rails 41, translating rails 9 and low temperature radiometer 2.
According to above-mentioned light radiation calibrating installation, the invention allows for a kind of light radiation calibration steps, by ultraviolet source, visible near-infrared light source and mid-infrared light source output spectrum scope from ultraviolet to infrared optical signal; Adjusted by the light path of optical fibre wavelength division multiplexer to described ultraviolet source, visible near-infrared light source and mid-infrared light source, the optical signal after adjustment is input to laser emission systems stabilisation after beam shaping; UV power systems stabilisation, visible power stablizing system or middle infrared power systems stabilisation is selected according to different optical bands; Optical signal through power stability arrives vacuum system and low temperature radiometer by spatial filter; Detector to be measured is positioned in the vacuum cavity in detector vacuum storehouse, makes measured device and low temperature radiometer be in identical test environment; Detector configuration precision displacement table to be measured and high precision translational guide rail, precision displacement table can carry out three-dimensional regulation, makes detector photosurface center and beam optical axis unification; Preparation vacuum storehouse is connected by slide valve with detector vacuum storehouse, first detector is placed on when changing detector in the precision displacement table in preparation vacuum storehouse, then preparation vacuum storehouse is vacuumized, treat that vacuum reaches requirement, open slide valve, by high precision translational guide rail, detector to be measured being sent in detector vacuum storehouse, shifting out detector vacuum storehouse by measuring complete detector, send back in preparation vacuum storehouse.Light radiation calibration steps of the present invention carries out vacuum pumping by the vacuum pump set of molecular pump unit and ionic pump combination, guarantees the condition of high vacuum degree of light radiation calibrating installation.
Light radiation calibrating installation of the present invention and method have the following advantages: (1) makes detector to be calibrated be in high vacuum environment, ensure that measured device and low temperature radiometer are in identical measurement environment, responsiveness under reflection vacuum working environment, closer to the ambient condition of space application, reduce uncertainty, improve the precision of light radiation calibration; (2) both remained the advantage that Brewster window can eliminate containment portion veiling glare, turn eliminate the uncertainty of measurement that window Transmissivity measurement is introduced, this will improve the precision of low temperature radiometer to spectral radiance calibration result greatly; (3) directly eliminate the measurement links of cavity Brewster window transmitance, make directly to utilize low temperature radiometer to carry out high-precision calibration in ultraviolet to infrared very wide wavelength band and become a reality.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a light radiation calibrating installation, is characterized in that, comprising: main optical path unit, laser emission systems stabilisation, vacuum system and low temperature radiometer;
Described main optical path unit comprises light source, optical fibre wavelength division multiplexer and beam shaping, wherein, light source comprises ultraviolet source, visible near-infrared light source and mid-infrared light source, and the optical signal that light source exports is input to described laser emission systems stabilisation after optical fibre wavelength division multiplexer and beam shaping;
Described laser emission systems stabilisation comprises the first translating rails, UV power systems stabilisation, visible power stablizing system and middle infrared power systems stabilisation;
Spatial filter is provided with between described laser emission systems stabilisation and vacuum system;
Described vacuum system comprises detector vacuum storehouse and preparation vacuum storehouse, cavity one end, detector vacuum storehouse is connected with described low temperature radiometer cavity by the first slide valve, the other end is configured with Brewster window, preparation vacuum storehouse cavity is connected with detector vacuum storehouse cavity by the second slide valve, detector vacuum storehouse is all equipped with watch window with preparation upper end, vacuum storehouse, described detector vacuum storehouse and preparation vacuum storehouse also comprise can the precision displacement table of three-dimensional regulation and the second translating rails, detector vacuum storehouse and preparation vacuum storehouse select vacuum pump set to vacuumize, vacuum pump set adopts molecular pump unit and ionic pump combination.
2. light radiation calibrating installation as claimed in claim 1, it is characterized in that, described second translating rails is high precision translational guide rail.
3. light radiation calibrating installation as claimed in claim 2, it is characterized in that, the quantity of described precision displacement table and the second translating rails is multiple.
4. light radiation calibrating installation as claimed in claim 1, it is characterized in that, magnesium fluoride optical glass selected by described Brewster window.
5. light radiation calibrating installation as claimed in claim 1, it is characterized in that, described low-temp radiating counts closed loop mechanical refrigeration low temperature radiometer.
6. a light radiation calibration steps, is characterized in that, by ultraviolet source, visible near-infrared light source and mid-infrared light source output spectrum scope from ultraviolet to infrared optical signal; Adjusted by the light path of optical fibre wavelength division multiplexer to described ultraviolet source, visible near-infrared light source and mid-infrared light source, the optical signal after adjustment is input to laser emission systems stabilisation after beam shaping; UV power systems stabilisation, visible power stablizing system or middle infrared power systems stabilisation is selected according to different optical bands; Optical signal through power stability arrives vacuum system and low temperature radiometer by spatial filter; Detector to be measured is positioned in the vacuum cavity in detector vacuum storehouse, makes detector to be measured and low temperature radiometer be in identical test environment; Detector configuration precision displacement table to be measured and high precision translational guide rail, precision displacement table can carry out three-dimensional regulation, makes detector photosurface center and beam optical axis unification; Preparation vacuum storehouse is connected by slide valve with detector vacuum storehouse, first detector is placed on when changing detector in the precision displacement table in preparation vacuum storehouse, then preparation vacuum storehouse is vacuumized, treat that vacuum reaches requirement, open slide valve, by high precision translational guide rail, detector to be measured being sent in detector vacuum storehouse, shifting out detector vacuum storehouse by measuring complete detector, send back in preparation vacuum storehouse.
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Address after: No. 726 Changzheng Road, Bengbu, Anhui Province

Co-patentee after: Anhui Institute of Optics and fine mechanics, Chinese Academy of Sciences

Patentee after: The 41st Institute of CETC

Address before: 266000 Qingdao economic and Technological Development Zone, Shandong Xiangjiang Road, No. 98

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