CN102854514A - Near field coaxial double-visual-field Mie scattering atmosphere lidar - Google Patents
Near field coaxial double-visual-field Mie scattering atmosphere lidar Download PDFInfo
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- CN102854514A CN102854514A CN201210353997XA CN201210353997A CN102854514A CN 102854514 A CN102854514 A CN 102854514A CN 201210353997X A CN201210353997X A CN 201210353997XA CN 201210353997 A CN201210353997 A CN 201210353997A CN 102854514 A CN102854514 A CN 102854514A
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Abstract
The invention relates to a near field coaxial double-visual-field Mie scattering atmosphere lidar which is characterized by comprising an optical system and a photoelectric detection system, wherein the optical system is used for launching a laser pulse bundle to the atmosphere and receiving a backward scattering echo produced by atmospheric aerosol to the launched laser pulse bundle; the photoelectric detection system is used for processing a backward scattering echo received by the optical system; and in the optical system, a laser launching system and two independent sets of optical receiving channels respectively adopt coaxial and non-coaxial sending and receiving designs, and the signal detection and collection simultaneously adopt a modulus detection and photon counting detection mode. According to the near field coaxial double-visual-field Mie scattering atmosphere lidar disclosed by the invention, the low altitude detection can adopt a large visual field angle and a coaxial system, the high altitude detection can adopt double modes of a small visual field angle and a non-coaxial system and photon counting and detection simulation, and therefore, the detection capability of a lidar system in a low altitude condition and a high altitude condition is enhanced, and the support is supplied for atmospheric boundary layer detection and stratosphere atmospheric aerosol detection.
Description
Technical field
The present invention relates to the laser radar technique field, especially relate to a kind of can be to the near field that atmospheric aerosol is measured coaxial double-view field Mie scattering atmospheric laser radar.
Background technology
Atmospheric aerosol refers to the diameter that suspending in the atmosphere less than various solids and the liquid particle of 10 μ m.Gasoloid proportion in atmosphere is very little, but radiation delivery and the water circulation of atmosphere all had material impact.Laser radar is analyzed inverting to echoed signal and can be obtained particulate Extinction Characteristic information by Emission Lasers bundle and the atmospheric aerosol particle generation echo of having an effect.Since laser beam have disperse little, wavelength is short, energy density is high, uses the laser radar detection atmospheric aerosol, stratification of atmosphere is surveyed, spatial and temporal resolution is good, accuracy of observation is high and the unique advantage of upper Continuous Observation of time but have.The ripe instrument that laser radar is surveyed as atmospheric aerosol has obtained broad research and application at home and abroad.
Descend because laser radar signal roughly is inverse ratio with the detection range increase, the dynamic range of echoed signal is very large, usually at 7 more than the order of magnitude.And the analog-digital converter of common employing generally is 12 sampling resolution during at present data acquisition, is difficult to gather the dynamic range signal of 7 orders of magnitude.For this problem, the solution that some laser radar systems are taked this has: change distance between emission light beam and the receiving telescope, dwindle field of view of receiver angle, chopper physical compression, photomultiplier gate, these measures are to give up the detectivity that signal closely improves distant signal, have brought into play good effect in the above aerological sounding of certain height especially 20km.For the expansion of laser light radar coverage, can carry out high low latitude layered probe to atmosphere, there is laser radar to adopt spectroscope that signal is divided into far and near two passages and realized carrying out simultaneously layered probe, but single field angle is difficult to take into account the far field and surveys height and near field detection blind area, field angle greatly then background interference is strong, and the little then low-altitude detection of field angle blind area is large.Adopt separately the design that becomes field angle also can't fundamentally solve this contradiction.
Summary of the invention
The present invention is directed to the problems referred to above, propose a kind of near field coaxial double-view field Mie scattering atmospheric laser radar.
Technical scheme provided by the invention is a kind of near field coaxial double-view field Mie scattering atmospheric laser radar, comprise to atmosphere Emission Lasers pulsed beams, receive atmospheric aerosol to the optical system of the backscattering echo of the laser pulse bundle generation of emission, and the photodetector system that backscattering echo that optical system receives is processed, the output of optical system connects photodetector system;
Described optical system comprises Laser emission subsystem, the first optics receiving cable and the second optics receiving cable, the optical axis of the laser pulse bundle of Laser emission subsystem emission and the optical axis coincidence of the first optics receiving cable, the optical axis of the laser pulse bundle that the Laser emission subsystem is launched is parallel with the optical axis of the second optics receiving cable and do not overlap;
The Laser emission subsystem is comprised of laser generator, laser beam expanding lens and catoptron, and laser generator 3 output laser pulse bundles by transmitting mirror 5 deflections, vertically are transmitted in the atmosphere behind laser beam expanding lens 4.
And catoptron is comprised of 45 ° of total reflective mirrors and three-dimensional regulation platform.
And, the first optics receiving cable be connected the optics receiving cable and interfere accordingly narrow band pass filter to form by receiving telescope, field stop, collimation lens and the transmission peak wavelength and the laser pulse bundle that connect successively respectively.
And photodetector system is comprised of the first photomultiplier, the second photomultiplier, the first front-end amplifier, the second front-end amplifier, the 3rd front-end amplifier, the first analog to digital converter, the second analog to digital converter, photon counter, light trigger and computing machine;
The output terminal of the first photomultiplier connects the input end of the first front-end amplifier and the input end of the second front-end amplifier simultaneously, and the output terminal of the first front-end amplifier links to each other with the first analog to digital converter, and the output terminal of the second front-end amplifier links to each other with photon counter;
The output terminal of the second photomultiplier links to each other with the input end of the 3rd front-end amplifier; The output terminal of the 3rd front-end amplifier links to each other with the second analog to digital converter;
The output terminal of light trigger links to each other with photon counter with the first analog to digital converter, the second analog to digital converter simultaneously, and the output terminal of the first analog to digital converter, the second analog to digital converter and photon counter links to each other with computing machine simultaneously.
The present invention adopts two independently field of view of receivers, and an employing is used for surveying upper atmosphere from the axle receive-transmit system, and one is adopted coaxial receive-transmit system to be used for surveying especially atmospheric boundary atmosphere of low latitude.It is excessive because of the dynamic range of echoed signal that the double-view field scheme has effectively been improved the monoscopic laser radar system, and the shortcoming of the detectivity of restriction laser radar.On the basis of double-view field laser radar, the far field receiving system further increases between Emission Lasers bundle and the receiving telescope distance and dwindles field of view of receiver, adopt simultaneously analog detection pattern and photon counting detection mode in part of data acquisition, the near field receiving system adopts coaxial receive-transmit system, improves respectively high-altitude and the low-altitude detection ability of system with this.This laser radar can obtain the aerocolloidal backscattering coefficient profile of atmosphere convection layer and extinction coefficient profile, for long term monitoring and systematic analysis provide hardware supported, for atmosphere, remote sensing and environmental science provide strong prospecting tools.
Description of drawings
Fig. 1 is the theory diagram of the embodiment of the invention.
Fig. 2 is the optical system schematic diagram of the embodiment of the invention.
Fig. 3 is the Photodetection system schematic diagram of the embodiment of the invention.
Embodiment
Embodiment selects the 532nm pulse laser, describes technical solution of the present invention in detail below in conjunction with drawings and Examples.
Referring to Fig. 1, the near field that embodiment provides coaxial double-view field Mie scattering atmospheric laser radar mainly comprises 2 parts: optical system 1, photodetector system 2.Optical system 1 is used for to atmosphere emission 532nm pulse laser, receives atmospheric aerosol to the backscattering echo of the laser pulse generation of emission.Photodetector system 2 is used for the backscattering echo signal of collecting is processed.
Referring to Fig. 2, the optical system 1 of embodiment is by laser generator 3, laser beam expanding lens 4, and catoptron 5, receiving telescope 6,7, field stop 8,9, collimation lens 10,11, transmission peak wavelength are that the interference narrow band pass filter 12,13 of 532nm forms.
The optical system 1 of embodiment comprises the Laser emission subsystem, and the Laser emission subsystem is to atmosphere emission 532nm pulse laser beam.The Laser emission subsystem is comprised of laser generator 3, laser beam expanding lens 4 and catoptron 5, laser generator 3 output 532nm laser pulse bundles, laser beam expanding lens 4 expands laser pulse Shu Jinhang, and the compression angle of divergence, transmitting mirror 5 has the three-dimensional regulation function, it vertically is transmitted in the atmosphere laser pulse beam steering after expanding.
During implementation, catoptron 5 can be comprised of 45 ° of total reflective mirrors and three-dimensional regulation platform.
Referring to Fig. 3, Photodetection system 2 among the embodiment is by the second photomultiplier 14, the first photomultiplier 15, the first front-end amplifier 17, the second front-end amplifier 18, the 3rd front-end amplifier 16, light trigger 19, the first analog to digital converter 21, the second analog to digital converter 20, photon counter 22 and computing machine 23 form.Photodetector system 2 overlaps independently optics receiving cable for two, also has two to overlap independently signal detection system.
The output terminal of the first photomultiplier 15 connects the input end of the first front-end amplifier 17 and the input end of the second front-end amplifier 18 simultaneously, the output terminal of the first front-end amplifier 17 links to each other with the first analog to digital converter 21, and the output terminal of the second front-end amplifier 18 links to each other with photon counter 22;
The output terminal of the second photomultiplier 14 links to each other with the input end of the 3rd front-end amplifier 16; The output terminal of the 3rd front-end amplifier 16 links to each other with the second analog to digital converter 20,
The output terminal of light trigger 19 links to each other with photon counter 22 with the first analog to digital converter 21, the second analog to digital converter 20 simultaneously, and trigger pip is delivered to the first analog to digital converter 21, the second analog to digital converter 20 and photon counter 22 simultaneously; The output terminal of the first analog to digital converter 21, the second analog to digital converter 20 and photon counter 22 links to each other with computing machine 23 simultaneously, carries out data and processes and store.
The present invention is installed in the ground observation website.Near field coaxial double-view field Mie scattering atmospheric laser radar is launched the pulse of 532nm wavelength laser to atmosphere straight up with the frequency of 20Hz, laser pulse in uphill process with atmosphere in aerosol particle thing generation Mie scattering, the backward echo light of Mie scattering is received by two independent optics receiving cables of this system, two optics receiving cables are realized different field of view of receiver angles by regulating field stop, large field angle is fit to the low latitude atmospheric aerosol and surveys, the light signal that receives is through collimation, filter, opto-electronic conversion, signal amplifies, after the analog-to-digital conversion process, be connected to computing machine and process and store; Neglect the rink corner and be fit to the upper atmosphere aerosol detection, the light signal that receives is connected to computing machine and processes and store after processing synchronously through collimation, optical filtering, opto-electronic conversion, signal amplification, analog to digital conversion and photon counting.The combination of analog to digital conversion and photon counting detection means can provide laser radar aerological sounding ability, and the combination of low latitude and aerological sounding passage can cover larger investigative range.
Specific embodiment described herein only is to the explanation for example of the present invention's spirit.Those skilled in the art can make various modifications or replenish or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (4)
1. near field coaxial double-view field Mie scattering atmospheric laser radar, it is characterized in that: comprise to atmosphere Emission Lasers pulsed beams, receive atmospheric aerosol to the optical system of the backscattering echo of the laser pulse bundle generation of emission, and the photodetector system that backscattering echo that optical system receives is processed, the output of optical system connects photodetector system;
Described optical system comprises Laser emission subsystem, the first optics receiving cable and the second optics receiving cable, the optical axis of the laser pulse bundle of Laser emission subsystem emission and the optical axis coincidence of the first optics receiving cable, the optical axis of the laser pulse bundle that the Laser emission subsystem is launched is parallel with the optical axis of the second optics receiving cable and do not overlap;
The Laser emission subsystem is comprised of laser generator, laser beam expanding lens and catoptron, and laser generator 3 output laser pulse bundles by transmitting mirror 5 deflections, vertically are transmitted in the atmosphere behind laser beam expanding lens 4.
2. the coaxial double-view field Mie scattering near field according to claim 1 atmospheric laser radar, it is characterized in that: catoptron is comprised of 45 ° of total reflective mirrors and three-dimensional regulation platform.
3. the coaxial double-view field Mie scattering near field according to claim 1 and 2 atmospheric laser radar is characterized in that: the first optics receiving cable be connected the optics receiving cable and interfere accordingly narrow band pass filter to form by receiving telescope, field stop, collimation lens and the transmission peak wavelength and the laser pulse bundle that connect successively respectively.
4. the coaxial double-view field Mie scattering near field according to claim 1 and 2 atmospheric laser radar, it is characterized in that: photodetector system is comprised of the first photomultiplier, the second photomultiplier, the first front-end amplifier, the second front-end amplifier, the 3rd front-end amplifier, the first analog to digital converter, the second analog to digital converter, photon counter, light trigger and computing machine;
The output terminal of the first photomultiplier connects the input end of the first front-end amplifier and the input end of the second front-end amplifier simultaneously, and the output terminal of the first front-end amplifier links to each other with the first analog to digital converter, and the output terminal of the second front-end amplifier links to each other with photon counter;
The output terminal of the second photomultiplier links to each other with the input end of the 3rd front-end amplifier; The output terminal of the 3rd front-end amplifier links to each other with the second analog to digital converter;
The output terminal of light trigger links to each other with photon counter with the first analog to digital converter, the second analog to digital converter simultaneously, and the output terminal of the first analog to digital converter, the second analog to digital converter and photon counter links to each other with computing machine simultaneously.
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105408764A (en) * | 2013-05-06 | 2016-03-16 | 丹麦科技大学 | Coaxial direct-detection LIDAR-system |
| CN105785341A (en) * | 2016-05-03 | 2016-07-20 | 中国科学院上海技术物理研究所 | Novel dual-channel laser radar receiving system for enhancing echo dynamic range |
| CN107688171A (en) * | 2017-10-25 | 2018-02-13 | 北京怡孚和融科技有限公司 | The method of laser radar dead zone-eliminating |
| CN107976681A (en) * | 2016-10-21 | 2018-05-01 | 北醒（北京）光子科技有限公司 | A kind of multi-thread optical distance measurement apparatus |
| CN107976689A (en) * | 2017-11-20 | 2018-05-01 | 北京空间机电研究所 | A kind of laser radar over the ground for aerosol detection |
| CN107976686A (en) * | 2017-10-26 | 2018-05-01 | 浙江大学 | A kind of more field angle oceanographic lidars and its field angle selection method |
| CN108363072A (en) * | 2017-11-27 | 2018-08-03 | 无锡中科光电技术有限公司 | A kind of new pattern laser radar and its manufacturing method |
| CN109031348A (en) * | 2017-11-27 | 2018-12-18 | 无锡中科光电技术有限公司 | Zero blind area laser radar of one kind and its manufacturing method |
| RU188541U1 (en) * | 2018-09-27 | 2019-04-16 | Федеральное государственное бюджетное учреждение науки Институт оптики атмосферы им. В.Е. Зуева Сибирского отделения Российской академии наук (ИОА СО РАН) | MULTIWAVE LIDAR FOR SENSING ATMOSPHERE |
| CN110109148A (en) * | 2019-04-09 | 2019-08-09 | 北京遥测技术研究所 | A kind of laser radar multi-channel photon counting and analog detection device and method |
| CN110275176A (en) * | 2019-08-08 | 2019-09-24 | 厦门市和奕华光电科技有限公司 | A kind of laser radar |
| CN111758048A (en) * | 2018-02-14 | 2020-10-09 | 罗伯特·博世有限公司 | Laser radar system, operating method for a laser radar system and operating device |
| WO2022116852A1 (en) * | 2020-12-02 | 2022-06-09 | 华为技术有限公司 | Detection device, control method and control device therefor, laser radar system, and terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105408764A (en) * | 2013-05-06 | 2016-03-16 | 丹麦科技大学 | Coaxial direct-detection LIDAR-system |
| US10598769B2 (en) | 2013-05-06 | 2020-03-24 | Danmarks Tekniske Universitet | Coaxial direct-detection LIDAR-system |
| CN105408764B (en) * | 2013-05-06 | 2019-08-09 | 丹麦科技大学 | Coaxially directly detect LIDAR system |
| CN105785341A (en) * | 2016-05-03 | 2016-07-20 | 中国科学院上海技术物理研究所 | Novel dual-channel laser radar receiving system for enhancing echo dynamic range |
| CN107976681A (en) * | 2016-10-21 | 2018-05-01 | 北醒（北京）光子科技有限公司 | A kind of multi-thread optical distance measurement apparatus |
| CN107688171A (en) * | 2017-10-25 | 2018-02-13 | 北京怡孚和融科技有限公司 | The method of laser radar dead zone-eliminating |
| CN107976686A (en) * | 2017-10-26 | 2018-05-01 | 浙江大学 | A kind of more field angle oceanographic lidars and its field angle selection method |
| CN107976686B (en) * | 2017-10-26 | 2020-12-08 | 浙江大学 | Multi-field angle ocean laser radar and field angle preference method thereof |
| CN107976689A (en) * | 2017-11-20 | 2018-05-01 | 北京空间机电研究所 | A kind of laser radar over the ground for aerosol detection |
| CN107976689B (en) * | 2017-11-20 | 2019-09-06 | 北京空间机电研究所 | A kind of laser radar over the ground for aerosol detection |
| CN108363072A (en) * | 2017-11-27 | 2018-08-03 | 无锡中科光电技术有限公司 | A kind of new pattern laser radar and its manufacturing method |
| CN109031348A (en) * | 2017-11-27 | 2018-12-18 | 无锡中科光电技术有限公司 | Zero blind area laser radar of one kind and its manufacturing method |
| CN109031348B (en) * | 2017-11-27 | 2022-08-05 | 无锡中科光电技术有限公司 | Zero-blind-area laser radar and manufacturing method thereof |
| CN111758048A (en) * | 2018-02-14 | 2020-10-09 | 罗伯特·博世有限公司 | Laser radar system, operating method for a laser radar system and operating device |
| RU188541U1 (en) * | 2018-09-27 | 2019-04-16 | Федеральное государственное бюджетное учреждение науки Институт оптики атмосферы им. В.Е. Зуева Сибирского отделения Российской академии наук (ИОА СО РАН) | MULTIWAVE LIDAR FOR SENSING ATMOSPHERE |
| CN110109148B (en) * | 2019-04-09 | 2021-02-09 | 北京遥测技术研究所 | Laser radar multichannel photon counting and simulation detection device and method |
| CN110109148A (en) * | 2019-04-09 | 2019-08-09 | 北京遥测技术研究所 | A kind of laser radar multi-channel photon counting and analog detection device and method |
| CN110275176A (en) * | 2019-08-08 | 2019-09-24 | 厦门市和奕华光电科技有限公司 | A kind of laser radar |
| WO2022116852A1 (en) * | 2020-12-02 | 2022-06-09 | 华为技术有限公司 | Detection device, control method and control device therefor, laser radar system, and terminal |
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