基于激光后向散射的多激光光束风场位移测量系统  

Multi-Laser Beam Measuring System for Detection of Wind Field Displacement Based on Backscatter Signals

作　　者：周立敏[1] 蒋亚东[1] 章正宇[2] 眭晓林[2] 

机构地区：[1]电子科技大学光电信息学院电子薄膜与集成器件国家重点实验室,四川成都610054 [2]中国电子科技集团公司第十一研究所,北京100015

出　　处：《激光与光电子学进展》2010年第8期45-49,共5页Laser & Optoelectronics Progress

基　　金：国家自然科学基金创新群体(60721001);国家自然科学基金重点项目(60736005)资助课题

摘　　要：针对多激光光束风场位移测量系统中对激光后向散射信号的采集和处理,设计了具有高速数据采集的多激光光束风场位移测量系统,并集成了大动态范围内快速变化的低信噪比(SNR)信号的实时接收提取、空间滤波、精密延时和精确波门控制等技术。系统主要由脉冲YAG激光器、雪崩光电二极管(APD)探测器、级联增益放大器、模数转换电路、现场可编程门阵列(FPGA)处理芯片及其外围电路、单片机控制系统和数据传输电路等组成,其中FPGA芯片成功地通过仿真,达到了设计要求。最后进行了实地风场测量实验,结果表明系统能够有效地检测出风场中不同距离处的散射回波信号,从而计算出风场的速度并通过分析得到风向。A high-speed data acquisition and processing system with integrated transceivers is designed to measure and monitor the wind fields at real time,which plays an important role in the multi-laser beam displacement measurement of wind field system.It can also realize the real-time extraction of low signal noise ratio（SNR） signals,which transforms rapidly in a wide dynamic range,spatial filtering,precision delay and accurate gate control technology.This system is mainly composed of YAG pulsed laser,avalanche photo diode（APD） detector,cascaded gain amplifiers,analog-to-digital conversion circuitry,field programmable gate array（FPGA） processing chip and its peripheral circuits,single-chip control systems and data transmission circuit.The experimental verification is also carried out,and the results show that multi-beam displacement measuring system can effectively detect the backscatter signals in various distances,by which we can calculate the wind speed and get the wind direction from data analysis.

关 键 词：测量 风场测量 激光后向散射 多激光光束 高速数据采集 现场可编程门阵列 

分 类 号：O436[机械工程—光学工程]