用于气溶胶探测光学雷达的LED光源的研制

Development of LED light source for aerosol detection optical radar

LED作为遥感探测光源具有波长丰富、体积小、价格低等优势。本文针对气溶胶探测光学雷达的应用,研制了一款新的LED光源。设计了LED的脉冲驱动电路,使其发出重复频率为100kHz、脉宽为200ns、单脉冲能量为30nJ的脉冲光束。利用ZEMAX软件建立了全内反射式准直器的仿真模型,并结合开普勒望远镜结构设计了两级准直光路,将光源发散角压缩到5.7mrad^22.9mrad范围内。分析了发散角对雷达几何重叠因子的影响规律,雷达系统的盲区不足3m,仿真结果和初步实验表明,雷达系统的探测距离可达210m。验证了LED光源用于气溶胶探测光学雷达的可行性,适用于城市内的近程气溶胶探测。

As a remote sensing light source,LED has the advantages of rich wavelengths,small size,low cost and so on;for aerosol detection optical radar applications,a new LED light source is developed.The LED pulse driving circuit is designed,making LED emitting the pulse light beam at the repetition rate of 100kHz,pulse width of 200ns,and pulse energy of 30nJ.Using the ZEMAX software,a simulation model for total internal reflection collimator is established;combining with Kepler telescope structure,a two-stage collimating light path is designed compressing beam divergence angle to the range of 5.7mrad^22.9mrad.The influence of beam divergence angle on the radar’s geometric overlap factor is analyzed,and it is shown that the blind area of radar system is very small.Simulation results and preliminary experimental results show that the detection range of radar system is up to 210m.The feasibility of the LED light source for aerosol detection optical radar is verified,with this radar suitable for near range aerosol detection in the city