CN204515135U - A kind of laser radar system of atmospheric sounding gas concentration lwevel - Google Patents
A kind of laser radar system of atmospheric sounding gas concentration lwevel Download PDFInfo
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- CN204515135U CN204515135U CN201520039995.2U CN201520039995U CN204515135U CN 204515135 U CN204515135 U CN 204515135U CN 201520039995 U CN201520039995 U CN 201520039995U CN 204515135 U CN204515135 U CN 204515135U
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
This patent discloses a kind of laser radar system of atmospheric sounding gas concentration lwevel, comprise ON long wavelength laser, OFF long wavelength laser, ON wavelength laser controller, OFF wavelength laser controller, two electrooptic modulators, two fiber couplers, image intensifer, transmitter-telescope, receiving telescope, two photodetectors, AD capture card, PC unit.The ON long wavelength laser of laser radar system does not adopt conventional active Frequency Stabilization Technique, but adopt passive frequency stabilization to add frequency modulating technology, the echo strength change that what the echoed signal of ON laser changed reflection within the extremely short time is because frequency modulation (PFM) brings, we extract the minimum value of one-period to reflect the echoed signal of this moment carbon dioxide absorption peak place wavelength, echoed signal and emitted energy monitor that the signal that photodetector obtains is normalized, ON accurately can be obtained, OFF wavelength echo signal intensity, atmospheric carbon dioxide concentration can be finally inversed by by DIAL equation.The measuring accuracy of system can be improved, and simplify the complexity of system.
Description
Technical field
This patent relates to a kind of laser radar system of atmospheric sounding gas concentration lwevel, particularly relates to a kind of laser detection system based on Difference Absorption principle detection carbon dioxide spatial concentration distribution.
Background technology
Since entering industrialization society, because mankind's activity causes global warming to obtain the extensive concern of people, CO2 is as a kind of important greenhouse gases, and the remittance change of its source is significant for research climate warming.DIAL, as the effective means of one of monitoring atmosphere CO 2 change, gets the attention.Current DIAL generally needs the laser that two bundle frequencies are different, and wherein beam of laser wavelength is in the non-absorbing wavelength (OFF wavelength) of carbon dioxide, in addition a branch of absorption peak wavelength (ON wavelength) being in carbon dioxide.Under normal circumstances, the optical maser wavelength be in absorption peak needs to carry out active frequency stabilization, initiatively frequency stabilization needs the instrument and equipment of more complicated, in addition because frequency reference unit (being generally hypobaric carbon dioxide) and the carbon dioxide absorption peak wavelength in true environment in air have different, certain error can be brought to measurement result again.
Summary of the invention
This patent proposes a kind of continuous wave Differential Absorption Laser Radar System measuring atmospheric carbon dioxide concentration, solves conventional difference absorption lidar system complex, the problem that measuring accuracy is not high.
Laser radar system described in this patent as shown in Figure 1, comprises ON long wavelength laser 2, OFF long wavelength laser 5, ON wavelength laser controller 1, OFF wavelength laser controller 4, first electrooptic modulator 3, second electrooptic modulator 6, first fiber coupler 7, second fiber coupler 9, image intensifer 8, transmitter-telescope 10, receiving telescope 12, first photodetector 11, second photodetector 13, AD capture card 14, with the PC unit 15 be for data processing.
ON laser controller 1 control ON long wavelength laser 2, ON long wavelength laser 2 Output of laser carries out sinusoidal wave intensity modulated through electrooptic modulator 3.OFF laser controller 4 control OFF long wavelength laser 5, OFF long wavelength laser 5 Output of laser carries out sinusoidal wave intensity modulated through the second electrooptic modulator 6.The Output of laser of the first electrooptic modulator 3 and the second electrooptic modulator 6 through beam coupler 7 coupling output to image intensifer 8, the output connecting fiber coupling mechanism 9 of image intensifer 8, coupling mechanism point sub-fraction light enters the first photodetector 11 and carries out emitted energy supervision, and remainder enters transmitter-telescope 10 and injects in air.Receiving telescope 12 receives hard goal echo, and echo laser is through the second photodetector 13, and the output signal of itself and the first photodetector 11 inputs AD capture card 14 and carries out AD conversion, and the digital data transmission obtained carries out data processing to PC 15.
Systematic survey principle is as follows: ON laser controller 1 control ON long wavelength laser 2, make the wavelength of ON long wavelength laser 2 modulated, modulation range should cover carbon dioxide absorption peak, and the centre frequency of modulation is by the passive frequency stabilization unit of inside, and namely constant-current constant-temperatureself-injection controller controls.First electrooptic modulator 3 and the second electrooptic modulator 6 are intensity modulator, and their modulating frequency should be different, are convenient to the echo strength of ON and OFF laser be separated at frequency domain when signal transacting.The echoed signal of ON long wavelength laser 2 has the shake of a rule at short notice, and this shake is the result because we modulate the wavelength of ON long wavelength laser, and the minimum value in one-period is the echoed signal of carbon dioxide absorption peak wavelength accurately.According to emitted energy signal and the received energy signal of ON and OFF long wavelength laser, then according to DIAL equation, just can be finally inversed by the concentration of atmospheric carbon dioxide.
Described ON long wavelength laser 2 and OFF long wavelength laser 5 are Wavelength tunable laser, adopt extenal cavity tunable laser device, or distributed feedback laser, laser wavelength can be tuning near carbon dioxide absorption peak wavelength, and absorbing peak-to-peak sharp wave described in this patent long is 1572nm wave band.
Described ON wavelength laser controller 1 and OFF wavelength laser controller 4 comprise constant-current controller and radiator valve, and radiator valve precision is better than per mille degree, and constant current source temperature coefficient is less than 100ppm/ DEG C.
Described first electrooptic modulator 3, second electrooptic modulator 6 is the laser intensity modulator once obtaining (Mach-Zehnder) principle of interference based on Mach.
Described first fiber coupler coupling 7, second fiber coupler coupling 9 is 1 × 2 fiber coupler, and operation wavelength covers laser wavelength.
Described image intensifer 8 can amplify wavelength coverage and cover laser works wavelength mentioned by this patent, and its emergent power meets measures requirement.
The laser beam divergence of outgoing can compress by described laser transmitting telescope 10.
Described receiving telescope 12 is reflective newton or Cassegrain telescope.
Described first photodetector 11, second photodetector 13 adopts InGaAs single-element detector.
The beneficial effect of this patent is:
1, do not need to carry out accurate frequency control to ON long wavelength laser, thus reduce because frequency stabilization needs a series of support equipments of bringing;
2, length scanning is carried out to ON long wavelength laser, the absorption peak of atmospheric carbon dioxide can be covered, the minimum value of echo is the echo power of ON wavelength, the method can obtain the return laser beam power at atmospheric carbon dioxide absorption peak place more accurately compared to classic method, reduces systematic error.
Accompanying drawing explanation
Fig. 1 is native system embodiment system construction drawing, in figure: 1-ON wavelength laser controller, 2-ON long wavelength laser, 3-first electrooptic modulator, 4-OFF wavelength laser controller, 5-OFF long wavelength laser, 6-second electrooptic modulator, 7-first fiber coupler, 8-image intensifer, 9-second fiber coupler, 10-transmitter-telescope, 11-first photodetector, 12-receiving telescope, 13-second photodetector, 14-AD capture card, 15-PC machine unit.
Embodiment
Method according to patent content, we devise the laser radar system of a set of atmospheric sounding carbon dioxide, wherein the Distributed Feedback Laser produced for EM4 company of ON long wavelength laser 2 and OFF long wavelength laser 5, and its wavelength covers 1572nm, and output power is greater than 60mW; ON wavelength laser controller 1 and OFF wavelength laser controller 4 are oneself development, and its temperature stability is due to per mille degree, and constant current source stability due to 100ppm/ DEG C, and can carry out current-modulation, thus realizes the wavelength-modulated to laser instrument; The 10GHz laser intensity modulator LN63S that first electrooptic modulator 3, second electrooptic modulator 6 is produced for Thorlabs company; First fiber coupler 7, second fiber coupler 9 is common single-mode polarization maintaining fiber coupling mechanism; What image intensifer 8 was produced for IPG company carries out for 1572nm wavelength the laser amplifier that amplifies, and its peak power output is 5W, and because image intensifer carries output collimating mirror, therefore we do not add other transmitter-telescopes again; First photodetector 11, second photodetector 13 is the photodetector developed voluntarily, has the photoelectric conversion capacity of 100MV/W; AD capture card is the sampling rate developed voluntarily is 50Msps, and resolution is the capture card of 14bit; PC is common computer.
Claims (3)
1. the laser radar system of an atmospheric sounding gas concentration lwevel, it comprises ON long wavelength laser (2), OFF long wavelength laser (5), ON wavelength laser controller (1), OFF wavelength laser controller (4), first electrooptic modulator (3), second electrooptic modulator (6), first fiber coupler (7), second fiber coupler (9), image intensifer (8), transmitter-telescope (10), receiving telescope (12), first photodetector (11), second photodetector (13), AD capture card (14), with the PC unit (15) be for data processing, it is characterized in that:
ON wavelength laser controller (1) control ON long wavelength laser (2), ON long wavelength laser (2) Output of laser carries out sinusoidal wave intensity modulated through the first electrooptic modulator (3); OFF wavelength laser controller (4) control OFF long wavelength laser (5), OFF long wavelength laser (5) Output of laser carries out sinusoidal wave intensity modulated through the second electrooptic modulator (6); The laser that first electrooptic modulator (3) and the second electrooptic modulator (6) export through the first fiber coupler (7) coupling output to image intensifer (8), the laser that image intensifer (8) exports connects the second fiber coupler (9), second fiber coupler (9) point sub-fraction light enters the first photodetector (11) and carries out emitted energy supervision, and remainder enters transmitter-telescope (10) and injects in air; Receiving telescope (12) receives hard goal echo, echo laser is through the second photodetector (13), the output signal of itself and the first photodetector (11) inputs AD capture card (14) and carries out AD conversion, and the digital data transmission obtained carries out data processing to PC unit (15).
2. the laser radar system of a kind of atmospheric sounding gas concentration lwevel according to claim 1, it is characterized in that, described ON long wavelength laser (2) and OFF long wavelength laser (5) adopt extenal cavity tunable laser device or the distributed feedback laser of tunable wave length, and their wavelength is tunable near carbon dioxide absorption peak peak sharp wave long 1572nm wave band.
3. the laser radar system of a kind of atmospheric sounding gas concentration lwevel according to claim 1, it is characterized in that, described ON wavelength laser controller (1) and OFF wavelength laser controller (4) comprise constant-current controller and radiator valve, radiator valve precision is better than per mille degree, and constant current source temperature coefficient is less than 100ppm/ DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520039995.2U CN204515135U (en) | 2014-06-12 | 2015-01-21 | A kind of laser radar system of atmospheric sounding gas concentration lwevel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410258886.XA CN104035102A (en) | 2014-06-12 | 2014-06-12 | Laser radar system and method for detecting concentrations of CO2 (Carbon Dioxide) in atmosphere |
| CN201410258886X | 2014-06-12 | ||
| CN201520039995.2U CN204515135U (en) | 2014-06-12 | 2015-01-21 | A kind of laser radar system of atmospheric sounding gas concentration lwevel |
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| CN201410258886.XA Pending CN104035102A (en) | 2014-06-12 | 2014-06-12 | Laser radar system and method for detecting concentrations of CO2 (Carbon Dioxide) in atmosphere |
| CN201510028883.1A Pending CN104570003A (en) | 2014-06-12 | 2015-01-21 | Laser radar system and method for detecting atmosphere carbon dioxide concentration |
| CN201520039995.2U Expired - Fee Related CN204515135U (en) | 2014-06-12 | 2015-01-21 | A kind of laser radar system of atmospheric sounding gas concentration lwevel |
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| CN201410258886.XA Pending CN104035102A (en) | 2014-06-12 | 2014-06-12 | Laser radar system and method for detecting concentrations of CO2 (Carbon Dioxide) in atmosphere |
| CN201510028883.1A Pending CN104570003A (en) | 2014-06-12 | 2015-01-21 | Laser radar system and method for detecting atmosphere carbon dioxide concentration |
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Cited By (5)
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| CN106124453A (en) * | 2016-07-29 | 2016-11-16 | 大连理工大学 | A kind of NO2the apparatus and method of concentration distribution detection |
| CN106382987A (en) * | 2016-09-30 | 2017-02-08 | 中国科学院合肥物质科学研究院 | All-fiber laser heterodyne solar radiometer |
| WO2020063073A1 (en) * | 2018-09-30 | 2020-04-02 | 中国科学院上海光学精密机械研究所 | Laser radar system apparatus for multi-wavelength measurement of atmospheric carbon dioxide concentration and vertical aerosol profile |
| CN112285674A (en) * | 2020-09-25 | 2021-01-29 | 中国科学院上海技术物理研究所 | Micro-pulse differential absorption laser radar transmitter for detecting atmospheric water vapor |
| CN115290599A (en) * | 2022-10-08 | 2022-11-04 | 青岛镭测创芯科技有限公司 | Laser radar system for measuring concentration of greenhouse gas |
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| CN106556566A (en) * | 2015-09-29 | 2017-04-05 | 东莞前沿技术研究院 | A kind of monitoring method of carbon dioxide, device and system |
| CN105510274B (en) * | 2015-11-30 | 2018-01-23 | 中国科学院光电研究院 | Airborne laser Atmospheric CO2Post concentration active telemetry system |
| CN107966712B (en) * | 2017-11-20 | 2019-11-12 | 北京空间机电研究所 | A kind of earth observation laser radar for the detection of trace gas column concentration |
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| GB0220914D0 (en) * | 2002-09-10 | 2002-10-23 | Qinetiq Ltd | Lidar apparatus and method |
| JP4657956B2 (en) * | 2006-03-14 | 2011-03-23 | 三菱電機株式会社 | Differential absorption lidar device |
| CN101493406B (en) * | 2008-11-04 | 2011-07-20 | 中国人民解放军电子工程学院 | Atmospheric air carbon dioxide long distance laser coherent detecting device based on differential absorption |
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2014
- 2014-06-12 CN CN201410258886.XA patent/CN104035102A/en active Pending
-
2015
- 2015-01-21 CN CN201510028883.1A patent/CN104570003A/en active Pending
- 2015-01-21 CN CN201520039995.2U patent/CN204515135U/en not_active Expired - Fee Related
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| CN106124453A (en) * | 2016-07-29 | 2016-11-16 | 大连理工大学 | A kind of NO2the apparatus and method of concentration distribution detection |
| CN106382987A (en) * | 2016-09-30 | 2017-02-08 | 中国科学院合肥物质科学研究院 | All-fiber laser heterodyne solar radiometer |
| CN106382987B (en) * | 2016-09-30 | 2017-10-31 | 中国科学院合肥物质科学研究院 | Full optical fiber laser heterodyne actinometer |
| WO2020063073A1 (en) * | 2018-09-30 | 2020-04-02 | 中国科学院上海光学精密机械研究所 | Laser radar system apparatus for multi-wavelength measurement of atmospheric carbon dioxide concentration and vertical aerosol profile |
| CN110967704A (en) * | 2018-09-30 | 2020-04-07 | 中国科学院上海光学精密机械研究所 | Laser radar system device for measuring atmospheric carbon dioxide concentration and aerosol vertical profile by multiple wavelengths |
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| US11397149B2 (en) | 2018-09-30 | 2022-07-26 | Shanghai Institute Of Optics And Fine Mechanics, Chinese Academy Of Sciences | Laser radar system apparatus for multi-wavelength measurement of atmospheric carbon dioxide concentration and vertical aerosol profile |
| CN112285674A (en) * | 2020-09-25 | 2021-01-29 | 中国科学院上海技术物理研究所 | Micro-pulse differential absorption laser radar transmitter for detecting atmospheric water vapor |
| CN115290599A (en) * | 2022-10-08 | 2022-11-04 | 青岛镭测创芯科技有限公司 | Laser radar system for measuring concentration of greenhouse gas |
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| CN104570003A (en) | 2015-04-29 |
| CN104035102A (en) | 2014-09-10 |
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Effective date of registration: 20170522 Address after: 201821, Shanghai Jiading Industrial Zone, green road, No. 2398, comprehensive experimental building 1, 1, the ground floor, Jiading District Patentee after: SHANGHAI JIWU PHOTOELECTRIC TECHNOLOGY CO.,LTD. Address before: 200083 Yutian Road, Shanghai, No. 500, No. Patentee before: SHANGHAI INSTITUTE OF TECHNICAL PHYSICS, CHINESE ACADEMY OF SCIENCE |
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