CN103256976B - Low-temperature absolute radiometer absolute spectral responsivity calibration method and experimental apparatus - Google Patents
Low-temperature absolute radiometer absolute spectral responsivity calibration method and experimental apparatus Download PDFInfo
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- CN103256976B CN103256976B CN201310090819.7A CN201310090819A CN103256976B CN 103256976 B CN103256976 B CN 103256976B CN 201310090819 A CN201310090819 A CN 201310090819A CN 103256976 B CN103256976 B CN 103256976B
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Abstract
The invention discloses a low-temperature absolute radiometer absolute spectral responsivity calibration method and an experimental apparatus. The experimental apparatus mainly comprises a main light path unit, a swing module unit, a low-temperature absolute radiometer, a detector vacuum chamber and a main control computer. The method includes the steps that a standard transmission detector and the low-temperature absolute radiometer are placed in the same vacuum environment and driven and controlled by an arc-shaped guide rail so that the low-temperature absolute radiometer and the standard transmission detector can pass through the same light path transmission path, the received incident light powers are completely the same, therefore, the influence of uncertainty in the process of measurement of window transmittance is eliminated, accuracy in the standard transmission process of the low-temperature absolute radiometer will be greatly improved, and the high-precision calibration of the absolute spectral responsivity of the standard transmission detector in the range between the ultraviolet band and the infrared band is achieved.
Description
Technical field
The present invention relates to remote sensing science and optical radiation measurement field, specifically a kind of low temperature absolute radiometer absolute spectral response calibrating method and experimental provision.
Background technology
Low temperature absolute radiometer is the measurement standard of current optical radiation power measurement aspect full accuracy, and it utilizes low temperature, vacuum and superconductor technology, and optical radiation heating measured and be entirely equivalent to electric power measurement, its measuring accuracy reaches and is better than 10
-5magnitude, has played basic key effect in fields such as remote sensing calibration, climate change, environmental monitoring, optical radiation measurements.
Developed country in recent years headed by the U.S., a large amount of basic experiment research and Integration ofTechnology has been carried out for low temperature absolute radiometer, along with a series of high-precision standard transmits succeeding in developing of detector (power, brightness, illumination etc.), the high-precision radiation benchmark of low temperature absolute radiometer also progressively transmission of quantity value to user's remote sensors such as ground spectral radiometer, satellite borne sensors.At home, Anhui Inst. of Optics and Fine Mechanics, Chinese Academy of Sciences takes the lead in having carried out light radiation scaling and the standard transmission work of counting primary criteria with low temperature absolute radiation.
From the calibration situation of user's remote sensor, be better than 1% at the calibration precision of visible waveband, be difficult to be better than 5% at infrared band calibration precision.Mainly by introducing in low temperature absolute radiometer standard transmittance process, larger uncertainty of measurement causes for this.Historic survey shows, the absolute spectral response calibration that low temperature absolute radiometer transmits detector to standard is the key link of remote sensor high precision transmission of quantity value.In standard transmittance process, the window transmitance of low temperature absolute radiometer is the main source affecting standard transmittance process uncertainty of measurement.
Traditional low temperature absolute radiometer window Transmissivity measurement is before and after the calibration of low temperature absolute radiometer, window is unloaded from low temperature absolute radiometer, by window restoration to the duty identical with low temperature absolute radiometer, have window by measuring and carry out estimation window transmitance value without the ratio of detector measurement during window, inciding the incident optical power waiting to calibrate detector can revise low temperature absolute radiometer measured value and window transmitance value.This method existing problems mainly contain: (1) low temperature absolute radiometer needs to regulate at each service band Brewster angle, and degree of regulation is poor; (2) window is pulled down process from low temperature absolute radiometer, and 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 absolute radiometer.The present invention devises a kind of low temperature absolute radiometer absolute spectral response calibrating method and experimental provision, eliminates the problem of window transmitance correction in low temperature absolute radiometer transmission of quantity value process completely, greatly improves the transmission of quantity value precision of low temperature absolute radiometer.
Summary of the invention
For a difficult problem for low temperature absolute radiometer window Transmissivity measurement process, the present invention devises a kind of low temperature absolute radiometer absolute spectral response calibrating method and experimental provision, standard is transmitted detector for it and low temperature absolute radiometer is placed in same vacuum environment, by the drived control of arc-shaped guide rail, ensure that low temperature absolute radiometer and standard transmit detector through identical optic path path, the incident optical power received is completely the same, thus eliminate the impact of the uncertainty brought in measurement window transmitance process, this precision that will substantially increase in low temperature absolute radiometer standard transmittance process.
The present invention is achieved by the following technical solutions:
An experimental provision for low temperature absolute radiometer, includes: main optical path unit, swing modular unit, low temperature absolute radiometer, detector vacuum storehouse, main control computer, described main optical path unit includes the fixing vacuum line of column level, described vacuum line sidewall has through hole, vacuum gauge is connected with by flange seal, be connected with by flange seal valve of finding time on the downside of vacuum line, the find time other end of valve is connected with vacuum pump set, vacuum line is rotated by a metal bellow and switches cavity with one and be connected, described rotation switches the Y type shape high vacuum cavity that cavity is a traverse, metal bellow switches cavity junction with rotation and is also provided with an interchangeable optical window, optical window light inlet side is fixed with the optical fiber splitter of 3 × 1, described rotation switches cavity two vacuum pipe ports and is connected with metal bellow respectively by a high vacuum slide valve, and described high vacuum slide valve is connected and sealed by flange,
Described swing modular unit include can ± the main control platform of 20 ° of horizontal huntings, main control platform rotary main shaft is fixed on to rotate and switches the cavity back side, rotates to switch cavity two vacuum pipes and be erected on main control platform; Swing modular unit and switch control rotation switching cavity two vacuum pipes respectively on light path main shaft according to accepted control signal.
Described low temperature absolute radiometer and detector vacuum storehouse are sealingly connected on Y type two metal bellows respectively, described low temperature absolute radiometer is placed in low temperature absolute radiometer hoistable platform and turns on platform, and two parametric controller realize low temperature absolute radiometer fine registration according to the control signal received; Described detector vacuum storehouse is the vacuum cavity that edge is communicated with a valve of finding time, and described evacuation valve door is connected and sealed by flange, and the other end of valve of finding time connects vacuum pump set simultaneously; In described detector vacuum storehouse, a high precision electric control translation stage is installed, what high precision electric control translation stage is placed with side by side three wave bands treats calibration detector, and high precision electric control translation stage realizes according to the control signal received the mobile handoff that three are waited to calibrate detector;
Described main control platform, low temperature absolute radiometer hoistable platform and turn to platform, high precision electric control translation stage, be all connected with stepper motor, stepper motor is by the main control computer control linkage of built in motion control card.
Based on the absolute spectral response calibrating method of the experimental provision of low temperature absolute radiometer, concrete implementation step is as follows:
(1) valve of finding time is opened, and the high vacuum slide valve be connected with low temperature absolute radiometer, detector vacuum storehouse, running vacuum pump set, makes low temperature absolute radiometer and target detector undetermined be placed in same vacuum environment;
(2) junction, closure detector vacuum storehouse high vacuum slide valve, changes on light path main shaft by low temperature absolute radiometer rotary cutting;
(3) visible-short infrared wave band tuning laser incides respectively in optical fiber splitter after playing inclined, power stability and spatial filtering, the laser beam of each wave band is after the common port of optical fiber splitter exports, and through Y type vacuum storehouse, optical window enters into warehouse inside; Laser beam is coupled in the effective aperture of low temperature absolute radiometer through accurately aiming at again, is measured the absolute power of incident laser by low temperature absolute radiometer;
(4) junction, detector vacuum storehouse high vacuum slide valve is opened, close low temperature absolute radiometer junction high vacuum slide valve simultaneously, change on light path main shaft by detector vacuum storehouse rotary cutting, laser beam is coupled into treating in detector vacuum storehouse through accurate aligning and calibrates in detector effective aperture; Treat that calibration detector realizes mobile handoff by high-precision electronic control translation stage for three.
(5) low temperature absolute radiometer calibrates each duplicate measurements of detector 5 times with waiting, obtain average laser absolute power and treat calibration detector average output voltage value, treat that the calibration output voltage of detector and the ratio of incident laser absolute power are and wait to calibrate the absolute spectral response of detector in this wavelength points.Other wavelength points calibrating methods are identical therewith.
Described detector vacuum storehouse is also circumscribed with power supply and electrostatic device; Vacuum pump set adopts the combination of dry pump and molecular pump, for described low temperature absolute radiometer experimental provision carries out evacuation processes, can realize the high vacuum in low temperature absolute radiometer experimental provision.
Low temperature absolute radiometer experimental provision is fixed by described precision vibration damping platform, reduces because the factors such as extraneous vibration are on the impact of measuring process; Described electronic control translation stage indoor design has circulating chilled water heat interchanger, is cooling process when detector works.
The optical window can replacing glass that described main optical path unit leading portion is installed, system support quartz glass, ZnSe optical glass are each a set of, can realize ultraviolet-infrared light radiation power through.
Described swing modular unit is designed with adjusting mechanism, be switched to respectively after on light path main shaft at low temperature absolute radiometer and detector vacuum storehouse, carry out lifting and the oscillation adjustment in low temperature absolute radiometer and detector vacuum storehouse, complete the height in low temperature absolute radiometer and detector vacuum storehouse and the accurate aligning in direction, realize the reception completely of light radiant flux.
Described low temperature absolute radiometer adopts vacuum, low temperature and superconductor technology electrical heating to be equivalent to completely optical radiation heating, accurately can measure the absolute light radiation power of incident laser.
Advantage of the present invention is:
Low temperature absolute radiometer and target detector undetermined are placed in same vacuum environment by the present invention, make low temperature absolute radiometer and treat that calibration detector is through identical optic path path, therefore low temperature absolute radiometer is arrived identical with waiting the luminous power of calibrating detector, namely in low temperature absolute radiometer transmission of quantity value process, eliminate the problem of window transmitance correction completely, greatly improve the transmission of quantity value precision of low temperature absolute radiometer.The present invention's standard that can realize within the scope of ultraviolet-infrared band transmits the high precision calibration of detector absolute spectral response, reduce low temperature absolute radiometer transmits detector relays link uncertainty of measurement to standard, will the precision and the remote sensing quantification inverting level that improve the calibration of optical sensor overall process be conducive to.
Accompanying drawing explanation
Fig. 1 is low temperature absolute radiometer experimental provision structural representation vertical view of the present invention.
Fig. 2 is main optical path unit optic path schematic diagram of the present invention.
Fig. 3 is that the present invention swings module control system theory diagram.
Embodiment
As shown in Figure 1, 2, 3, a kind of experimental provision of low temperature absolute radiometer, includes: main optical path unit 1, swing modular unit 2, low temperature absolute radiometer 3, detector vacuum storehouse 4, main control computer 13;
Main optical path unit 1 includes the fixing vacuum line 10 of column level, vacuum line 10 1 side has through hole, vacuum gauge 6 is connected with by flange seal, be connected with by flange seal valve 5 of finding time on the downside of vacuum line 10, the find time other end of valve 5 is connected with vacuum pump set, vacuum line 10 is rotated by a metal bellow and switches cavity 7 with one and be connected, described rotation switches the Y type shape high vacuum cavity that cavity 7 is traverses, metal bellow switches cavity 7 junction with rotation and is also provided with an interchangeable optical window, optical window light inlet side is fixed with the optical fiber splitter 12 of 3 × 1, described rotation switches cavity 7 two vacuum pipe ports and is connected with metal bellow respectively by a high vacuum slide valve 8,9, and described high vacuum slide valve 8,9 is connected and sealed by flange,
Described swing modular unit 2 include can ± the main control platform 16 of 20 ° of horizontal huntings, main control platform 16 rotary main shaft is fixed on to rotate and switches cavity 7 back side, rotates to switch cavity 7 two vacuum pipes and be erected on main control platform 16; Swing modular unit 2 and switch control rotation switching cavity two vacuum pipes respectively on light path main shaft.
Described low temperature absolute radiometer 3 is sealingly connected on Y type two metal bellows with detector vacuum storehouse 4 respectively, described low temperature absolute radiometer 3 is external to two parametric controller: low temperature absolute radiometer hoistable platform 17 and turn to platform 18, and two parametric controller realize low temperature absolute radiometer fine registration according to the control signal received; Described detector vacuum storehouse 4 is vacuum cavities that edge is communicated with a valve of finding time, and valve 11 of finding time is connected and sealed by flange, and the other end of valve 11 of finding time connects vacuum pump set simultaneously; In described detector vacuum storehouse 4, a high precision electric control translation stage 19 is installed, what high precision electric control translation stage 19 is placed with side by side three wave bands treats calibration detector, and high precision electric control translation stage 19 realizes according to the control signal received the mobile handoff that three are waited to calibrate detector.
Described main control platform 16, low temperature absolute radiometer hoistable platform 17 and turn to platform 18, high precision electric control translation stage 19, be all connected with stepper motor, stepper motor is by main control computer 13 control linkage of built in motion control card 14.
Detector vacuum storehouse is also circumscribed with power supply 21 and electrostatic device 22; Vacuum pump set adopts the combination of dry pump and molecular pump; Low temperature absolute radiometer experimental provision is fixed by precision vibration damping platform, reduces because the factors such as extraneous vibration are on the impact of measuring process; Electronic control translation stage indoor design has circulating chilled water heat interchanger, is cooling process when detector works.
The absolute spectral response calibrating method of the experimental provision of low temperature absolute radiometer, concrete implementation step is as follows:
(1) valve of finding time is opened, and the high vacuum slide valve be connected with low temperature absolute radiometer, detector vacuum storehouse, running vacuum pump set, makes low temperature absolute radiometer and target detector undetermined be placed in same vacuum environment;
(2) junction, closure detector vacuum storehouse high vacuum slide valve, changes on light path main shaft by low temperature absolute radiometer rotary cutting;
(3) ultraviolet-infrared band tuning laser incides in optical fiber splitter respectively through rising partially, after power stability and spatial filtering, and the laser beam of each wave band is after the common port of optical fiber splitter exports, and through Y type vacuum storehouse, optical window enters into warehouse inside; Laser beam is coupled in the effective aperture of low temperature absolute radiometer through accurately aiming at again, is measured the absolute power of incident laser by low temperature absolute radiometer;
(4) junction, detector vacuum storehouse high vacuum slide valve is opened, close low temperature absolute radiometer junction high vacuum slide valve simultaneously, change on light path main shaft by detector vacuum storehouse rotary cutting, laser beam is coupled into treating in detector vacuum storehouse through accurate aligning and calibrates in detector effective aperture; Treat that calibration detector realizes mobile handoff by high-precision electronic control translation stage for three.
(5) low temperature absolute radiometer calibrates each duplicate measurements of detector 5 times with waiting, obtain average laser absolute power and treat calibration detector average output voltage value, treat that the calibration output voltage of detector and the ratio of incident laser absolute power are and wait to calibrate the absolute spectral response of detector in this wavelength points.Other wavelength points calibrating methods are identical therewith.
Claims (6)
1. an experimental provision for low temperature absolute radiometer, is characterized in that: include main optical path unit, swing modular unit, low temperature absolute radiometer, detector vacuum storehouse, main control computer;
Described main optical path unit includes the fixing vacuum line of column level, described vacuum line one sidewall has through hole, vacuum gauge is connected with by flange seal, another sidewall of vacuum line is connected with by flange seal valve of finding time, the find time other end of valve is connected with vacuum pump set, vacuum line is rotated by a metal bellow and switches cavity with one and be connected, described rotation switches the Y type shape high vacuum cavity that cavity is a traverse, metal bellow switches cavity junction with rotation and is also provided with an interchangeable optical window, optical window light inlet side is fixed with the optical fiber splitter of 3 × 1, described rotation switches cavity two vacuum pipe ports and is connected with metal bellow respectively by a high vacuum slide valve, and described high vacuum slide valve is connected and sealed by flange,
Described swing modular unit include can ± the main control platform of 20 ° of horizontal huntings, main control platform rotary main shaft is fixed on to rotate and switches the cavity back side, rotates to switch cavity two vacuum pipes and be erected on main control platform; Swing modular unit and switch control rotation switching cavity two vacuum pipes respectively on light path main shaft according to accepted control signal;
Described low temperature absolute radiometer and detector vacuum storehouse are sealingly connected on Y type two metal bellows respectively, described low temperature absolute radiometer is placed in low temperature absolute radiometer hoistable platform and turns on platform, and two parametric controller realize low temperature absolute radiometer fine registration according to the control signal received; Described detector vacuum storehouse is the vacuum cavity that edge is communicated with a valve of finding time, and described evacuation valve door is connected and sealed by flange, and the other end of valve of finding time connects vacuum pump set simultaneously; In described detector vacuum storehouse, a high precision electric control translation stage is installed, what high precision electric control translation stage is placed with side by side three wave bands treats calibration detector, and high precision electric control translation stage realizes according to the control signal received the mobile handoff that three are waited to calibrate detector;
Described main control platform, low temperature absolute radiometer hoistable platform and turn to platform, high precision electric control translation stage, be all connected with stepper motor, stepper motor is by the main control computer control linkage of built in motion control card.
2. the experimental provision of a kind of low temperature absolute radiometer according to claim 1, is characterized in that: described detector vacuum storehouse is also circumscribed with power supply and electrostatic device.
3. the experimental provision of a kind of low temperature absolute radiometer according to claim 1, is characterized in that: described vacuum pump set adopts dry pump and molecular pump to combine.
4. the experimental provision of a kind of low temperature absolute radiometer according to claim 1, is characterized in that: also include precision vibration damping platform, and low temperature absolute radiometer experimental provision is fixed by described precision vibration damping platform.
5. the experimental provision of a kind of low temperature absolute radiometer according to claim 1, is characterized in that: described electronic control translation stage indoor design has circulating chilled water heat interchanger, is cooling process when detector works.
6. the experimental provision of a kind of low temperature absolute radiometer according to claim 1, its absolute spectral response calibrating method concrete steps are as follows:
(1) valve of finding time is opened, and the high vacuum slide valve be connected with low temperature absolute radiometer, detector vacuum storehouse, running vacuum pump set, makes low temperature absolute radiometer and target detector undetermined be placed in same vacuum environment;
(2) junction, closure detector vacuum storehouse high vacuum slide valve, changes on light path main shaft by low temperature absolute radiometer rotary cutting;
(3) visible-short infrared wave band tuning laser incides respectively in optical fiber splitter after playing inclined, power stability and spatial filtering, the laser beam of each wave band is after the common port of optical fiber splitter exports, and through Y type vacuum storehouse, optical window enters into warehouse inside; Laser beam is coupled in the effective aperture of low temperature absolute radiometer through accurately aiming at again, is measured the absolute power of incident laser by low temperature absolute radiometer;
(4) junction, detector vacuum storehouse high vacuum slide valve is opened, close low temperature absolute radiometer junction high vacuum slide valve simultaneously, change on light path main shaft by detector vacuum storehouse rotary cutting, laser beam is coupled into treating in detector vacuum storehouse through accurate aligning and calibrates in detector effective aperture; Treat that calibration detector realizes mobile handoff by high-precision electronic control translation stage for three;
(5) low temperature absolute radiometer calibrates each duplicate measurements of detector 5 times with waiting, obtain average laser absolute power and treat calibration detector average output voltage value, treat that the calibration output voltage of detector and the ratio of incident laser absolute power are and wait to calibrate the absolute spectral response of detector in this wavelength points;
Other wavelength points calibrating methods are identical therewith.
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| CN103575402B (en) * | 2013-11-07 | 2017-11-10 | 中国电子科技集团公司第四十一研究所 | Non-refrigerated infrared detector relative spectral response new testing device for temperature properties and method |
| CN105764228B (en) * | 2014-12-19 | 2018-04-24 | 中国科学院空间科学与应用研究中心 | A kind of scaling system and method for space neutral atom probe instrument |
| CN106291649B (en) * | 2015-05-25 | 2018-12-04 | 中国科学院空间科学与应用研究中心 | It is a kind of to determine calibration method using ground magnetic rigidity progress space ion detector |
| CN110967111A (en) * | 2019-11-15 | 2020-04-07 | 中山大学 | Spectral response calibration system and test method of vacuum ultraviolet light detector |
| CN111044150A (en) * | 2019-12-23 | 2020-04-21 | 中国科学院长春光学精密机械与物理研究所 | Irradiance scaling device and irradiance scaling system |
| CN111044151A (en) * | 2019-12-23 | 2020-04-21 | 中国科学院长春光学精密机械与物理研究所 | Solar total irradiance calibration device from traceability to SI |
| CN111426448B (en) * | 2020-03-27 | 2021-06-22 | 中国科学院西安光学精密机械研究所 | Optical assembly performance test platform |
| CN113295270B (en) * | 2021-06-01 | 2022-05-31 | 中国电子科技集团公司第四十一研究所 | Light beam alignment device and method for ultralow-temperature vacuum environment |
| CN113687507B (en) * | 2021-08-27 | 2023-10-31 | 西安应用光学研究所 | Ultrahigh vacuum optical path switching mechanism applied to optical calibration device |
| CN114136444B (en) * | 2021-11-19 | 2024-03-26 | 西安应用光学研究所 | Broadband detector spectral responsivity calibrating device based on low-temperature radiometer |
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| CN100416237C (en) * | 2005-01-08 | 2008-09-03 | 中国科学院安徽光学精密机械研究所 | Realizing method and device of high precision radiation brightness standard based on standard detector |
| CN100582742C (en) * | 2006-12-19 | 2010-01-20 | 中国科学院安徽光学精密机械研究所 | High-accuracy multifunctional wide-spectrum radiation comparison system |
| CN102305663B (en) * | 2011-08-15 | 2013-10-30 | 西北核技术研究所 | Calibration apparatus measuring mid-infrared detector responsivity with temperature change |
| CN203274912U (en) * | 2013-05-30 | 2013-11-06 | 中国电子科技集团公司第四十一研究所 | An optical radiation calibrating device |
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