CN105444882A - Eight-channel radiometer capable of realizing self-calibrating function - Google Patents
Eight-channel radiometer capable of realizing self-calibrating function Download PDFInfo
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- CN105444882A CN105444882A CN201510934342.5A CN201510934342A CN105444882A CN 105444882 A CN105444882 A CN 105444882A CN 201510934342 A CN201510934342 A CN 201510934342A CN 105444882 A CN105444882 A CN 105444882A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
- G01J3/0297—Constructional arrangements for removing other types of optical noise or for performing calibration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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Abstract
The invention discloses an eight-channel radiometer capable of realizing a self-calibrating function. The radiometer also has a radiation observation and self-calibrating function. The eight-channel radiometer comprises an observation light path, a related photon generating module, a scanning motor module, a multiplexing telescope module, a collimating light path module, a light splitting and gathering light path module, a photoelectric detection and signal processing module. The decay factors of the optoelectronic circuit of the eight-channel radiometer can be evaluated by disposing the related photon calibrating device in the radiometer, and then the periodic correction of the calibration coefficient of the eight-channel radiometer can be realized. The related photon calibrating device is absolute, and the tracing to the high-precision measurement standard is not required, and therefore the higher calibrating precision can be achieved.
Description
Technical field
The present invention relates to remote sensing science and optical radiation measurement field, specifically a kind of eight passage radiometer designs realizing self calibration function.
Background technology
Spectral radiometer obtains the most important photoelectric measurement equipment of remote sensing observations target optical spectrum radiation information, multiple platforms such as ground, unmanned plane, balloon, satellite can be arranged in, obtain the spectral radiance of observed object, have a wide range of applications at numerous areas such as agricultural, industry, military affairs, space flight.
The spectroscopic modes of the spectral radiometer of current commercialization has multiple, and comprise optical filter, grating, prism, liquid crystal tunable etc., these spectral radiometers generally need to carry out Laboratory Calibration before observation, obtains the calibration coefficient of spectral radiometer.On moonscope platform, general remote sensor all can be subject to the impact of the outer space environmental factors such as space ultraviolet irradiation, high-energy particle bombardment, the easy aging decay of optical, electrical element, periodically correcting optical sensor calibration coefficient can the brightness of exact inversion target optical spectrum spoke.
Mainly contain onboard process and In-flight calibration two kinds of modes to moonscope Calibration of remote sensor mode at present, onboard process, then using the sun, the moon or fixed star celestial body as scaling light source, utilizes diffusing panel on star to calibrate, or on satellite platform, puts into built-in scaler.In-flight calibration is then the associated arguments such as synchro measure ground and air when satellite crosses top, substitutes into atmospheric transfer model, the process of inverting satellite entrance pupil spoke brightness.
No matter be onboard process or In-flight calibration, in order to improve the application level of Satellite Payloads, all need the radiation magnitude tracing of satellite optical load to SI system of units, scaler arranged by satellite platform, can ensure that Satellite Payloads is traced to the source to high-precision measurement standard, but general measurement standard also can change on satellite platform, how is this change assessed? onboard process device is arranged in addition on satellite platform, all multiple resource of satellite platform need be taken, affect the serviceable life of satellite.
Relative photon calibration technology is the process utilizing the relative photon such as laser and nonlinear medium interaction generation time, space, frequency, detect the existence that a photon just can predict another photon, utilize this principle can realize carrying out qualitative assessment to the quantum efficiency of photodetector.Eight passage radiometers of development, possess Radiation Observation and self-calibration function, wherein self calibration module can carry out quantitative measurment to the optical circuit dissipation factor of eight passage radiometers, thus realize eight passage radiometers " without standard transmit " absolute calibration, play the effect of space-reference radiation level by Future Satellite remote sensing onboard process process, realize carrying out transmission of quantity value to other moonscope Calibration of remote sensor coefficients.
Summary of the invention
The invention provides a kind of eight passage radiometers that can realize self calibration, equipment has Radiation Observation and self-calibration function concurrently, self calibration module can carry out qualitative assessment to the photoelectricity dissipation factor of eight passage radiometers, the calibration coefficient of regular acquisition eight passage radiometer, realizes the correction to eight passage radiometer Radiation Observation values.
The present invention is achieved by the following technical solutions:
Realize eight passage radiometers of self calibration function, it is characterized in that: include observation light path, observation light path is provided with relative photon generation module, scan module module successively, described relative photon generation module includes the laser instrument set gradually, the polarizer, half-wave plate, laser power stability device, condenser lens, nonlinear crystal and collimation lens, it is the pumping laser of 355nm that described laser instrument produces wavelength, generation linearly polarized light to the rear is played through the polarizer, stable laser beam is produced after laser power stability device, after to converge to the center of nonlinear crystal through condenser lens, when meeting phase-matching condition, produce the broadband relative photon spectrum of spontaneous radiation, the directional light of collimation is produced after collimation lens, described scan module module comprises scanning reflection mirror, respectively eight passage radiometers are switched to Radiation Observation pattern and calibration mode respectively, the reflected light path when scanning reflection mirror of scan module module works is provided with multiplexing module of looking in the distance, collimated light path module, light splitting and Path of Convergent Rays module, photodetection and signal processing module successively, described multiplexing module of looking in the distance comprises the cutoff filter set gradually, preposition diaphragm, Path of Convergent Rays, catoptron and field stop, on the one hand for determining the observation visual field size of eight passage radiometers, ensure that Radiation Observation pattern and calibration mode have common transmission light path on the other hand, described collimated light path module is that the divergent beams that field stop place exports are converted to directional light, described light splitting and Path of Convergent Rays by color separation film, the relative photon light source of eight wavelength are carried out space to be separated, and incides in corresponding photon counting detector by Path of Convergent Rays, described photodetection and signal processing module include be connected successively photoelectric detection module, meet detecting module and signal processing module, photoelectric detection module utilizes photon counting detector that photon signal is converted to electric impulse signal, and the relative photon signal of eight wave bands adopts eight road photon counting detectors to detect respectively, meet detecting module be by shaping pulse after Transistor-Transistor Logic level signal detect through time-to-amplitude converter, signal processing module is then record coincidence counting, unexpected coincidence counting, trigger port counting, trigger port dark counting, and records counting and the dark counting of eight channel detectors in Radiation Observation process.
Signal processing module, mainly comprise the signal transacting of calibration mode and the signal transacting of Radiation Observation pattern, the signal transacting of calibration mode mainly obtains the optical circuit loss of common sparing, the photon velocity of the spectrum channel of the signal processing of the Radiation Observation pattern photon counting detector mainly in record unit time, and the final correction coefficient obtaining eight passage radiometers.
Based on eight passage radiometer radiation calibration bearing calibrations of self calibration function, concrete implementation step is as follows:
(1) power supply of the measuring equipments such as laser power stabilizator, photon counting detector, time-to-amplitude converter, photon counter is opened, preheating more than 30 minutes;
(2) scanning reflection mirror of scan module module is switched to calibration light path, the light transmission shaft of minute adjustment half-wave plate is consistent with the optical axis direction of nonlinear crystal, the Measuring Time of photon counting detector is set, effective coincidence counting value that writing time, amplitude conversion exported and effective trigger counting value;
(3) optical axis direction of half-wave plate is rotated miter angle, the Measuring Time of photon counting detector is set, the unexpected coincidence counting value that writing time, amplitude conversion exported and background trigger counting value;
(4) the shared optical circuit decay factor size of Radiation Observation and calibration mode is obtained by (2), (3);
(5) close pumping laser, scanning reflection mirror 90-degree rotation is switched to Radiation Observation light path, the Measuring Time of photon counting detector is set, record the photon count value that each passage photon counting detector exports;
(6) correlation parameter measured in (4), (5) and known parameters are updated in eight passage radiometer actinometry equations, obtain the radiation calibration coefficient of the passage of eight passage radiometers.
Advantage of the present invention is:
Relative photon calibration technology is applied in optical sensor spectroradiometric measurement process by the present invention, regular realization is to the renewal of optical sensor calibration coefficient and correction, because relative photon calibration is a kind of calibration technology not needing standard to transmit, therefore do not need to trace high-precision measurement standard on laboratory and satellite platform, there is lower uncertainty of measurement in theory.
The spectral radiometer that the present invention utilizes relative photon calibration principle to make, have Radiation Observation and self-alignment function concurrently, self calibration module can realize measuring the change of the whole optical circuit of spectral radiometer, changed factor is updated in actinometry equation and can obtains revised calibration coefficient, thus realize the self calibration of spectral radiometer.
Accompanying drawing explanation
Fig. 1 is the eight passage radiometer light path schematic diagram that the present invention realizes self calibration function.
Fig. 2 is photodetection of the present invention and signal processing module schematic diagram.
Embodiment
As shown in Figure 1, 2, a kind of eight passage radiometers realizing self calibration function, include observation light path 1, and observation light path 1 is provided with relative photon generation module 2, scan module module 3 successively, relative photon generation module 2 includes the laser instrument 2.1 set gradually, the polarizer 2.2, half-wave plate 2.3, laser power stability device 2.4, condenser lens 2.5, nonlinear crystal 2.6 and collimation lens 2.7, laser instrument 2.1 produces the pumping laser that wavelength is 355nm, through the polarizer 2.2 generation linearly polarized light to the rear, stable laser beam is produced after laser power stability device 2.4, after to converge to the center of nonlinear crystal 2.6 through condenser lens 2.5, when meeting phase-matching condition, produce the broadband relative photon spectrum of spontaneous radiation, the directional light of collimation is produced after collimation lens 2.7, scan module module 3 comprises scanning reflection mirror 3.1, respectively eight passage radiometers are switched to Radiation Observation pattern and calibration mode respectively, the reflected light path when scanning reflection mirror 3.1 of scan module module 3 works are provided with successively multiplexing module 4 of looking in the distance, collimated light path module 5, light splitting and Path of Convergent Rays module 6, photodetection and signal processing module, multiplexing module 4 of looking in the distance comprises the cutoff filter 4.1, preposition diaphragm 4.2, Path of Convergent Rays 4.3, catoptron 4.4 and the field stop 4.5 that set gradually, on the one hand for determining the observation visual field size of eight passage radiometers, ensure that Radiation Observation pattern and calibration mode have common transmission light path on the other hand, collimated light path module 5 is that the divergent beams that field stop 4.5 place exports are converted to directional light, light splitting and Path of Convergent Rays 6 by color separation film, the relative photon light source of eight wavelength are carried out space to be separated, and incides in corresponding photon counting detector by Path of Convergent Rays, photodetection and signal processing module include be connected successively photoelectric detection module 7, meet detecting module 8 and signal processing module 9, photoelectric detection module 7 utilizes photon counting detector that photon signal is converted to electric impulse signal, and the relative photon signal of eight wave bands adopts eight road photon counting detectors to detect respectively, meet detecting module 8 be by shaping pulse after Transistor-Transistor Logic level signal detect through time-to-amplitude converter, signal processing module 9 is record coincidence counting, unexpected coincidence counting, trigger port counting, trigger port dark counting, and records counting and the dark counting of eight channel detectors in Radiation Observation process.
As shown in Figure 2, the flashlight that parametric down conversion process produces and idle light are received by photon counting detector, the Transistor-Transistor Logic level signal of standard is produced after opto-electronic conversion, assuming that a road is as triggering photon signal, be input to the Start end of time-to-amplitude converter, after the delayed device in another road, be input to the Stop end of time-to-amplitude converter, the time interval that two-way relative photon arrives can be converted to amplitude and export by time-to-amplitude converter, by multichannel analyzer by different distribution of amplitudes on different locations, road, multiple metering device record is utilized effectively to trigger photon counting and meet photon counting, surprisingly meet photon counting, utilize upper computer software to the critical data in experimentation, figure carries out recording and preserving, and treatment and analysis is carried out to measurement result.
Based on eight passage radiometer Calibration Methods of self calibration function, concrete implementation step is as follows:
(1) power supply of the measuring equipments such as pump laser, laser power stability device, photon counter detector, time-to-amplitude converter, photon counter is opened;
(2) scanning reflection mirror is switched to calibration light path.Minute adjustment half-wave plate consistent with the optical axis direction of nonlinear crystal through axle, arranges the Measuring Time of photon counting detector, effective coincidence counting value that writing time, amplitude conversion exported and effective trigger counting value;
(3) optical axis direction of half-wave plate is rotated miter angle, the Measuring Time of photon counting detector is set, the unexpected coincidence counting value that writing time, amplitude conversion exported and background trigger counting value;
(4) the shared optical circuit decay factor size of Radiation Observation and calibration mode is obtained by (2), (3);
(5) close pumping laser, scanning reflection mirror 90-degree rotation is switched to Radiation Observation light path, the Measuring Time of photon counting detector is set, record the photon count value that each passage photon counting detector exports;
(6) correlation parameter measured in (4), (5) and known parameters are updated in eight passage radiometer measurement equations, obtain the radiation calibration coefficient of eight passage radiometers.
Claims (1)
1. realize eight passage radiometers of self calibration function, it is characterized in that: include observation light path, observation light path is provided with relative photon generation module, scan module module successively, described relative photon generation module includes the laser instrument set gradually, the polarizer, half-wave plate, laser power stability device, condenser lens, nonlinear crystal and collimation lens, it is the pumping laser of 355nm that described laser instrument produces wavelength, generation linearly polarized light to the rear is played through the polarizer, stable laser beam is produced after laser power stability device, after to converge to the center of nonlinear crystal through condenser lens, when meeting phase-matching condition, produce the broadband relative photon spectrum of spontaneous radiation, the directional light of collimation is produced after collimation lens, described scan module module comprises scanning reflection mirror, respectively eight passage radiometers are switched to Radiation Observation pattern and calibration mode respectively, the reflected light path when scanning reflection mirror of scan module module works is provided with multiplexing module of looking in the distance, collimated light path module, light splitting and Path of Convergent Rays module, photodetection and signal processing module successively, described multiplexing module of looking in the distance comprises the cutoff filter set gradually, preposition diaphragm, Path of Convergent Rays, catoptron and field stop, on the one hand for determining the observation visual field size of eight passage radiometers, ensure that Radiation Observation pattern and calibration mode have common transmission light path on the other hand, described collimated light path module is that the divergent beams that field stop place exports are converted to directional light, described light splitting and Path of Convergent Rays by color separation film, the relative photon light source of eight wavelength are carried out space to be separated, and incides in corresponding photon counting detector by Path of Convergent Rays, described photodetection and signal processing module include be connected successively photoelectric detection module, meet detecting module and signal processing module, photoelectric detection module utilizes photon counting detector that photon signal is converted to electric impulse signal, and the relative photon signal of eight wave bands adopts eight road photon counting detectors to detect respectively, meet detecting module be by shaping pulse after Transistor-Transistor Logic level signal detect through time-to-amplitude converter, signal processing module is record coincidence counting, unexpected coincidence counting, trigger port counting, trigger port dark counting, and records counting and the dark counting of eight channel detectors in Radiation Observation process.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482830A (en) * | 2016-09-29 | 2017-03-08 | 清华大学 | A kind of calibration system of the photon counter based on standard light source and method |
| CN106500591A (en) * | 2016-12-26 | 2017-03-15 | 哈尔滨工程大学 | A kind of integrated form multiband Michelson's interferometer |
| CN106645030A (en) * | 2016-12-26 | 2017-05-10 | 哈尔滨工程大学 | Integrated multiband mach-zehnder interferometer and application method |
| CN110736540A (en) * | 2019-09-18 | 2020-01-31 | 中国科学院合肥物质科学研究院 | Relevant photon self-calibration solar spectral irradiance instrument with 266nm pumping |
| CN111953338A (en) * | 2020-09-09 | 2020-11-17 | 绵阳市维博电子有限责任公司 | Real-time low-power-consumption integrated nuclear signal forming counting circuit |
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| CN104634742A (en) * | 2015-02-04 | 2015-05-20 | 中国科学院合肥物质科学研究院 | Optical path of multispectral polarization scanning radiometer based on reflecting telescope system |
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| US6147747A (en) * | 1997-08-22 | 2000-11-14 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Lidar remote sensing system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106482830A (en) * | 2016-09-29 | 2017-03-08 | 清华大学 | A kind of calibration system of the photon counter based on standard light source and method |
| CN106500591A (en) * | 2016-12-26 | 2017-03-15 | 哈尔滨工程大学 | A kind of integrated form multiband Michelson's interferometer |
| CN106645030A (en) * | 2016-12-26 | 2017-05-10 | 哈尔滨工程大学 | Integrated multiband mach-zehnder interferometer and application method |
| CN106500591B (en) * | 2016-12-26 | 2018-12-11 | 哈尔滨工程大学 | A kind of integrated form multiband Michelson's interferometer |
| CN106645030B (en) * | 2016-12-26 | 2019-03-05 | 哈尔滨工程大学 | A kind of integrated form multiband Mach-Zehnder interferometer and application method |
| CN110736540A (en) * | 2019-09-18 | 2020-01-31 | 中国科学院合肥物质科学研究院 | Relevant photon self-calibration solar spectral irradiance instrument with 266nm pumping |
| CN110736540B (en) * | 2019-09-18 | 2021-06-22 | 中国科学院合肥物质科学研究院 | 266nm pumped relevant photon self-calibration solar spectral irradiance instrument |
| CN111953338A (en) * | 2020-09-09 | 2020-11-17 | 绵阳市维博电子有限责任公司 | Real-time low-power-consumption integrated nuclear signal forming counting circuit |
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