CN1967284A - Lidar transmission-type double focal length optical transceiver system - Google Patents
Lidar transmission-type double focal length optical transceiver system Download PDFInfo
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- CN1967284A CN1967284A CN 200610096063 CN200610096063A CN1967284A CN 1967284 A CN1967284 A CN 1967284A CN 200610096063 CN200610096063 CN 200610096063 CN 200610096063 A CN200610096063 A CN 200610096063A CN 1967284 A CN1967284 A CN 1967284A
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Abstract
This invention discloses a laser radar transmission double-focal length optical transceiver system, overcome complex structure, echo signal reception loss shortcoming of technological reflector laser radar. It is characterized by the optical emission module comprised by the mirror, expand beam focal length lens and optical emission lens with focal length of f1, also by optical receive module comprised by optical receive lens with focal length of f2. Emission lens are installed in the central reception lens hole. Laser beam is emitted as parallel beam from the laser beam mirrors, beam expanding lens and emission lens. The scattering echo signal is by the receive lens gathered in the tube tail. Then aperture, collimating lens, filters and detectors of photoelectric detection system makes signal conversion. Finally signal is sent to the computer analysis. The device is used for aerosol particles for the qualitative and quantitative detection, atmospheric boundary layer height of the identification, aerosol particles vertical distribution Aerosol particles time change and troposphere aerosol particles layered features.
Description
Technical field
The invention belongs to the transmitting-receiving optical system of laser radar.
Background technology
Laser radar is one of new and high technology that develops rapidly, is the product that traditional Radar Technology combines with modern laser.Laser radar is to aerial emission laser pulse, the aerosol particle thing carries out the atmospheric optics characteristic research to the back scattering of laser pulse in the atmosphere by receiving, according to this analyse atmos visibility, aerosol particle thing spatial and temporal distributions and change in time and space, the cloud base cloud level, boundary layer height, aerosol particle thing characteristic etc.Because the laser backscatter signal of returning is very faint, carry out the acquisition of signal except using high-sensitive detector, the optical telescope that receives the laser backscatter signal is the key component that influences the laser radar performance.
No matter be the emission light beam with the coaxial laser radar of receiving beam or launch the laser radar from axle of light beam and receiving beam, all adopt reflective Cassegrain telescope as optics receiving telescope or Newtonian telescope as the optics receiving telescope.
For the reflective laser radar, adopt Cassegrain telescope or Newtonian telescope that the radar system of particular requirement is had its special advantage, as the image scanning laser radar, adopt the autocollimator can color difference eliminating, but adopt cancellation spherical aberration when parabolic when object lens.For being the laser radar system of purpose, adopt autocollimator that adjustment, processing, maintenance and the performance optimization of laser radar system are had inconvenience to receive the echoed signal energy.Be summarized as follows:
1, the autocollimator system forms by primary mirror and secondary mirror, all be coated with metal film (as aluminium film, golden film) or other deielectric-coating of certain reflectivity on each work minute surface, if the reflectivity of each minute surface is 85%, then 72.3% of gross energy is also only arranged through the energy that receives behind the telescopic system, big lossy the intensity of the faint optical signal that receives.
2, in the autocollimator system, the reflectivity of primary mirror and secondary mirror surface institute's aluminizer or other deielectric-coating (particularly field work) in long-term work can reduce greatly.As long-term work laser radar system out of doors, minute surface institute aluminizer is relatively poor because of its corrosion resistance, is easy to take place oxidation in abominable atmospheric environment.
3, in laser radar system, adopt debug the quite difficulty of autocollimator system for primary mirror and secondary mirror, particularly,, must adjust the light path of total system again if major and minor mirror position changes for the maintenance of laser radar.
4, for coaxial receiving type laser radar system, laser beam through beam-expanding collimation system after a catoptron send, same axial adjustment for emission light beam and receiving telescope system is quite difficult, if have a component locations to change in the test transportation in the open air, the optical axis of emission light beam and receiving telescope system is departed from, have a strong impact on the performance of whole radar, even can't operate as normal.
5, for from axle receiving type laser radar system, must guarantee that in whole radar the emission light beam is parallel with the optical axis of receiving telescope system, this kind working method is not only cumbersome on adjusting, and on the space exploration distance, have bigger blind area (at least greater than 400m), therefore must carry out overlapping correction to whole laser radar system at work.
Summary of the invention
The objective of the invention is in order to improve the laser radar echo signal receiving strength, development is easy to adjust, processes, the laser radar of maintenance and high performance-price ratio, overcoming existing is the reflective laser radar system (from axle or coaxial) of purpose to receive echoed signal intensity, complex structure, cost an arm and a leg, adjust processing and safeguard inconvenience, for the bigger shortcoming of received echoed signal loss of intensity, invent a kind of lidar transmission-type double focal length optical transceiver system, overcome the deficiency of the reflective transmitting-receiving optical system of laser radar.
Technical scheme of the present invention is as follows:
Lidar transmission-type double focal length optical transceiver system, it is characterized in that being equipped with in the telescopical lens barrel of transmission by catoptron, beam expanding lens and focal length is that the diversing lens of f1 is formed the transmitting optics unit and is that the receiver lens of f2 is formed and received optical unit by focal length; Lens barrel central authorities are equipped with catoptron, on the telescopical lens barrel sidewall of transmission laser instrument is installed, by light-conducting system laser beam is imported catoptron, beam expanding lens is installed in catoptron the place ahead, receiver lens is installed in the lens barrel port, diversing lens is installed in the hole of receiver lens central authorities, and catoptron is positioned at the focus place of diversing lens.
Described light-conducting system is meant reflector group or optical fiber.
Described diversing lens is embedded in the hole of receiver lens central authorities.
Laser instrument emitted laser bundle sends with parallel beam through catoptron, beam expanding lens and diversing lens, and backward scattered echoed signal is then directly surveyed behind receiver lens, diaphragm, collimation lens and optical filter.
Utilize the transmission-type laser radar system to carry out the detection of echoed signal, because diversing lens is one with receiver lens and has different focal lengths, though the laser beam of sending through diversing lens has partial reflection can not enter into detector, therefore greatly reduce of the influence of initial transmissions laser beam, improved the sensitivity of surveying detector.
The present invention is applicable to atmosphere environment supervision (atmospheric visibility, aerosol particle thing spatial and temporal distributions and change in time and space, the cloud base cloud level, boundary layer height, aerosol particle thing characteristic etc.), water body pollution laser induction fluorescence remote sensing monitoring, and being suitable for to survey echoed signal intensity is the various laser radar systems of answer to a riddle.
Advantage of the present invention:
1, adopted the transmission-type telescopic system in the laser radar system, its simple in structure, handling ease is easy to sealing, is suitable for field work;
2, laser beam emission reception is coaxial, has dwindled detection blind area greatly.Compare (blind area is at least greater than 400 meters) with the reflective laser radar, the detection blind area of this kind structure only has 50 meters, thereby is particularly suitable for the inferior atmospheric layer environment detection;
3, adopt the diversing lens and the receiver lens of different focal, make laser beam and detector be in same axis, debug conveniently, and loss of optical signal is little, improve detectable signal to noise ratio (S/N ratio) greatly, need not simultaneously laser beam is carried out shaping, make system works reliable and stable;
4, need not to show the reflectance coating of aluminizing, avoided the aluminize emissivity of reflectance coating of long-term use to descend at mirror.
Description of drawings
Fig. 1 is the structural drawing of lidar transmission-type double focal length optical transceiver system.
Fig. 2 be adopt Beijing area aerosol particle thing spatial and temporal distributions that transmission-type bi-focal transmitting-receiving optical system laser radar system measures and the space-time structure of aerosol particle thing in the gas boundary layer.
Embodiment
Lidar transmission-type double focal length optical transceiver system, being equipped with by catoptron, beam expanding lens and focal length in transmission telescope lens barrel is the transmitting optics unit that the diversing lens of f1 is formed; By focal length is the reception optical unit that the receiver lens of f2 is formed.On the telescopical lens barrel sidewall laser instrument is installed, by light-conducting system (catoptron or optical fiber) laser beam is imported catoptron, catoptron is installed in lens barrel central authorities, catoptron the place ahead is equipped with the transmitting optics unit that focal length is f1, the lens barrel port is equipped with receiver lens, there is a little diversing lens in receiver lens central authorities, and catoptron is positioned at the focus place of diversing lens.
Laser instrument emitted laser bundle sends with parallel beam through catoptron, beam expanding lens and diversing lens, and backward scattered echoed signal then is focused at the lens barrel afterbody through receiver lens.The detection system of being made up of diaphragm, collimation lens, optical filter and detector is carried out the photosignal conversion then, sends into Computer Analysis at last and handles.
The laser radar performance index of being made up of transmission-type bi-focal transmitting-receiving optical system see the following form
| Transmitter unit | Measurement index | ||
| Light-pulse generator | The Nd:YAD laser instrument | The space measurement scope | 0～15Km |
| Wavelength (nm) | Optional 1064,532,355 | Spatial resolution | 7.5～150m is optional |
| Repetition frequency | 1～20Hz | Temporal resolution | 10～600s |
| The angle of divergence | ＜0.6mrad | Maximum detectable range | 30Km |
| Receiving element | Effective detection range | 15Km | |
| Telescope | The transmission-type telescope | Other | |
| Field angle | 2mrad | The elevation angle | -5°～+95° |
| Probe unit | Size | 800×600×850mm | |
| Detector | PMT、APD | Volume | 45Kg |
| Optical filter | The 2nm bandwidth | Power supply | 220VAC，50～60Hz |
| Analog to digital conversion | A/D changes (14,50MHz) | Power | 800W |
| Computing machine | Industrial Control Computer | Working temperature | -10～50℃ |
Fig. 2 provide utilize transmission-type laser radar system actual measurement Beijing area aerosol particle thing spatial and temporal distributions and the measurement result of the space-time structure of aerosol particle thing in the atmospheric boundary layer, aerosol particle thing in the Beijing City atmospheric boundary layer distributes and has tangible sandwich construction, and rich the variation.The aerosol particle thing pollutes and accumulates in mostly below the 0.8km height in the boundary layer, on August 21st, 2005, morning on the 22nd aerosol particle thing pollution layer thicker, highly locate also to exist the higher aerosol particle thing of concentration at the overhead about 1.0km～1.2km of survey station and pollute and roll into a ball except that existence near the ground.
Claims (3)
1, lidar transmission-type double focal length optical transceiver system, it is characterized in that being equipped with in the telescopical lens barrel of transmission by catoptron, beam expanding lens and focal length is that the diversing lens of f1 is formed the transmitting optics unit and is that the receiver lens of f2 is formed and received optical unit by focal length; Lens barrel central authorities are equipped with catoptron, on the telescopical lens barrel sidewall of transmission laser instrument is installed, by light-conducting system laser beam is imported catoptron, beam expanding lens is installed in catoptron the place ahead, receiver lens is installed in the lens barrel port, diversing lens is installed in the hole of receiver lens central authorities, and catoptron is positioned at the focus place of diversing lens.
2, optical system according to claim 1 is characterized in that described light-conducting system is meant reflector group or optical fiber.
3, optical system according to claim 1 is characterized in that described diversing lens is embedded in the hole of receiver lens central authorities.
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| CN 200610096063 CN1967284A (en) | 2006-09-14 | 2006-09-14 | Lidar transmission-type double focal length optical transceiver system |
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| CN 200610096063 CN1967284A (en) | 2006-09-14 | 2006-09-14 | Lidar transmission-type double focal length optical transceiver system |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086527B (en) * | 2007-07-11 | 2010-08-25 | 浙江大学 | Method for probing incident laser direction and signal detection device |
| CN102269865A (en) * | 2011-07-19 | 2011-12-07 | 中国科学技术大学 | Dustproof frost-proof optical telescope system in direct contact with atmosphere |
| CN101435870B (en) * | 2007-11-12 | 2012-06-13 | 电装波动株式会社 | Laser radar apparatus that measures direction and distance of an object |
| CN102621558A (en) * | 2012-01-08 | 2012-08-01 | 杨少辰 | Laser radar visibility meter and transceiving coaxial optical system thereof |
| CN103135113A (en) * | 2013-02-05 | 2013-06-05 | 中国科学院大气物理研究所 | Method for measuring height of atmospheric boundary layer |
| CN105891802A (en) * | 2016-05-30 | 2016-08-24 | 张进 | Laser radar system based on coaxial light path, automobile head lamp and automobile rearview mirror |
| CN105929407A (en) * | 2016-04-24 | 2016-09-07 | 西南技术物理研究所 | Laser wind-finding radar optical antenna focal length self-adaptive adjustment method |
| CN107015237A (en) * | 2017-06-12 | 2017-08-04 | 深圳市镭神智能系统有限公司 | A kind of sounding optical system |
| CN107037446A (en) * | 2016-07-07 | 2017-08-11 | 无锡中科光电技术有限公司 | A kind of Atmospheric particulates are walked to navigate observation laser radar device |
| CN107421647A (en) * | 2017-07-13 | 2017-12-01 | 中国石油天然气股份有限公司 | Common light path sending and receiving apparatus for thermopile detector |
| CN109001747A (en) * | 2018-06-20 | 2018-12-14 | 合肥菲涅尔光电科技有限公司 | A kind of non-blind area laser radar system |
| CN109154660A (en) * | 2016-05-19 | 2019-01-04 | 皇家飞利浦有限公司 | compact laser sensor |
| CN109270514A (en) * | 2018-11-26 | 2019-01-25 | 中国科学院合肥物质科学研究院 | A kind of double optical-fiber laser radar systems for realizing the low blind area detection of double-view field |
| CN109814087A (en) * | 2019-03-11 | 2019-05-28 | 上海禾赛光电科技有限公司 | Laser transmitting-receiving module and laser radar system |
| CN110100159A (en) * | 2016-12-03 | 2019-08-06 | 伟摩有限责任公司 | The waveguide diffusing globe of light detection is carried out using aperture |
| CN110596673A (en) * | 2018-06-13 | 2019-12-20 | 罗伯特·博世有限公司 | Coaxial laser radar system |
| CN111060891A (en) * | 2019-12-30 | 2020-04-24 | 广东博智林机器人有限公司 | Laser radar |
| CN111123239A (en) * | 2019-12-20 | 2020-05-08 | 深圳市速腾聚创科技有限公司 | Receiving device, transmitting/receiving device, and laser radar |
| WO2021142997A1 (en) * | 2020-01-15 | 2021-07-22 | 深圳玩智商科技有限公司 | Receiving lens, tof coaxial radar laser receive-emit system structure and product |
| CN116840854A (en) * | 2023-09-01 | 2023-10-03 | 山东省科学院激光研究所 | Single-photon laser radar optical system for aerosol detection |
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2006
- 2006-09-14 CN CN 200610096063 patent/CN1967284A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086527B (en) * | 2007-07-11 | 2010-08-25 | 浙江大学 | Method for probing incident laser direction and signal detection device |
| CN101435870B (en) * | 2007-11-12 | 2012-06-13 | 电装波动株式会社 | Laser radar apparatus that measures direction and distance of an object |
| CN102269865A (en) * | 2011-07-19 | 2011-12-07 | 中国科学技术大学 | Dustproof frost-proof optical telescope system in direct contact with atmosphere |
| CN102269865B (en) * | 2011-07-19 | 2013-01-09 | 中国科学技术大学 | Dustproof frost-proof optical telescope system in direct contact with atmosphere |
| CN102621558A (en) * | 2012-01-08 | 2012-08-01 | 杨少辰 | Laser radar visibility meter and transceiving coaxial optical system thereof |
| CN103135113A (en) * | 2013-02-05 | 2013-06-05 | 中国科学院大气物理研究所 | Method for measuring height of atmospheric boundary layer |
| CN103135113B (en) * | 2013-02-05 | 2014-08-06 | 中国科学院大气物理研究所 | Method for measuring height of atmospheric boundary layer |
| CN105929407A (en) * | 2016-04-24 | 2016-09-07 | 西南技术物理研究所 | Laser wind-finding radar optical antenna focal length self-adaptive adjustment method |
| CN109154660A (en) * | 2016-05-19 | 2019-01-04 | 皇家飞利浦有限公司 | compact laser sensor |
| CN105891802A (en) * | 2016-05-30 | 2016-08-24 | 张进 | Laser radar system based on coaxial light path, automobile head lamp and automobile rearview mirror |
| CN107037446A (en) * | 2016-07-07 | 2017-08-11 | 无锡中科光电技术有限公司 | A kind of Atmospheric particulates are walked to navigate observation laser radar device |
| CN110100159A (en) * | 2016-12-03 | 2019-08-06 | 伟摩有限责任公司 | The waveguide diffusing globe of light detection is carried out using aperture |
| US11041753B2 (en) | 2016-12-03 | 2021-06-22 | Waymo Llc | Light detection using an aperture |
| CN107015237A (en) * | 2017-06-12 | 2017-08-04 | 深圳市镭神智能系统有限公司 | A kind of sounding optical system |
| CN107421647A (en) * | 2017-07-13 | 2017-12-01 | 中国石油天然气股份有限公司 | Common light path sending and receiving apparatus for thermopile detector |
| CN107421647B (en) * | 2017-07-13 | 2019-08-06 | 中国石油天然气股份有限公司 | Total optical path sending and receiving apparatus for thermopile detector |
| CN110596673A (en) * | 2018-06-13 | 2019-12-20 | 罗伯特·博世有限公司 | Coaxial laser radar system |
| CN109001747A (en) * | 2018-06-20 | 2018-12-14 | 合肥菲涅尔光电科技有限公司 | A kind of non-blind area laser radar system |
| CN109270514A (en) * | 2018-11-26 | 2019-01-25 | 中国科学院合肥物质科学研究院 | A kind of double optical-fiber laser radar systems for realizing the low blind area detection of double-view field |
| CN109270514B (en) * | 2018-11-26 | 2023-04-25 | 中国科学院合肥物质科学研究院 | Double-optical-fiber laser radar system for realizing double-view-field low-blind-area detection |
| CN109814087A (en) * | 2019-03-11 | 2019-05-28 | 上海禾赛光电科技有限公司 | Laser transmitting-receiving module and laser radar system |
| CN111123239A (en) * | 2019-12-20 | 2020-05-08 | 深圳市速腾聚创科技有限公司 | Receiving device, transmitting/receiving device, and laser radar |
| CN111123239B (en) * | 2019-12-20 | 2022-08-16 | 深圳市速腾聚创科技有限公司 | Receiving device, transmitting/receiving device, and laser radar |
| CN111060891A (en) * | 2019-12-30 | 2020-04-24 | 广东博智林机器人有限公司 | Laser radar |
| WO2021142997A1 (en) * | 2020-01-15 | 2021-07-22 | 深圳玩智商科技有限公司 | Receiving lens, tof coaxial radar laser receive-emit system structure and product |
| CN116840854A (en) * | 2023-09-01 | 2023-10-03 | 山东省科学院激光研究所 | Single-photon laser radar optical system for aerosol detection |
| CN116840854B (en) * | 2023-09-01 | 2023-11-21 | 山东省科学院激光研究所 | Single-photon laser radar optical system for aerosol detection |
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Open date: 20070523 |