The Development To A Kind Of 355nm Active Laser Wind Radar Optical System

Accurate atmospheric wind field data measurement plays an important role in human life,laser wind radar is a kind of high space-time resolution and high accuracy technology at detecting atmospheric wind field data.At present,domestic engaged in large-diameter wind lidar telescope optical system developed by small handful of units.This thesis actively developed the studying of 355 nanometer wind lidar project in key technical points.Thesis summarizes the active laser wind radar system research meaning,the laser radar system structure constitute and the principle of doppler effect to measure wind speed.By comparing two mirror system structure characteristics,combing with active laser radar wind telescope project design requirements: the wavelength ?=355nm,field of view 2?=±0.0025o,the system wave aberration root mean square RMS? ?/5(detection wavelength ?=632.8nm),devised catadioptric telescopes receiving optical systems that consist of two catadioptric mirror system and collimating focusing lens,and expanded beam launch optical systems,moreover,use the optical path reverse alignment way to commissioning test the receiving optical system.In view of the single wavelength ultraviolet invisible light of 355 nm active laser radar system debugging difficulty,from the design of the system analysis on the optical path reverse alignment.Two catadioptric mirror system make the working wavelength of 355 nm and detection wavelength of 632.8nm under the condition of consistent mirror spacing is 1100 mm,using 4D interferometer and 1.6 meter standard planar mirror combine of autocollimation measuring optical path to reverse path alignment;use 355 nm laser and 4D Interferometer front-facing lens combine of autocollimation measuring optical path to alignment the lens group.After the alignment,measured the interference figure data for wave aberration of two catadioptric mirror system center FOV is: PV= 1.852?,RMS=0.20266?(?=632.8 nm)indicators meet the design requirements;the lens group back focal length when alone measured l2"'=42.310 mm,the whole receiving optical system alignment back focal lengthl2""= 42.325 mm,respectively both do Subtraction calculation with the theoretical calculation back focal length and system zemax software optimization back focal lengthl2'=42.35 mm,l2"=39.546 mm,errors are within the scope of the permit,and the overall receiving optical system alignment after reflection and the focal point of emission light overlap.This method with using 355 nm laser and 4D interferometer and its front-facing lens to optical path reverse alignment contrapose,reduces the difficulty of system alignment to speed up the project development process.