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利用Nd:YAG激光器产生10 Hz的1064、532和355 nm激光束作为光源,研制了用于对流层大气气溶胶探测的全天时多波长激光雷达,实现了溶胶Mie散射信号在紫外、可见和红外三个波段的精细分离和提取。通过小孔光阑和窄带干涉滤光片对背景光的强烈抑制,实现了全天时探测。通过对三波长Mie散射信号日间和夜间探测信噪比数值仿真和实际探测信噪比分析,得出日间探测时532 nm的信噪比最低,夜间探测时355 nm的信噪比最低,这与数值仿真结果一致。通过分析实际探测信噪比为1时的数据,得到该系统日间探测高度可达8~10 km,夜间探测高度可达10~12 km。对西安地区晴天、多云天和雾霾天的初步探测结果表明,该多波长激光雷达的性能完全能够满足对流层内气溶胶粒子的全天时和不同天气情况下的探测要求。
The 1064, 532 and 355 nm laser beams of 10 Hz were used as the light source by Nd: YAG laser to develop an all-time multi-wavelength laser radar for aerosol detection in the troposphere. The sol-gel Mie scattering signals were obtained in the UV, visible and infrared Fine separation and extraction of three bands. Through the aperture aperture and narrowband interference filter on the strong inhibition of the background light to achieve the all-day detection. Through the numerical simulation of day-night and night-time signal-to-noise ratio of three-wavelength Mie scattering signal and the actual detection SNR, it is concluded that the signal-to-noise ratio of 532 nm during daytime detection is the lowest, the signal-to-noise ratio of 355 nm is the lowest during nighttime detection, This is consistent with the numerical simulation results. By analyzing the data of the actual detection signal-to-noise ratio (SNR = 1), the system can detect up to 8-10 km in daytime and up to 10-12 km in nighttime. The preliminary detection of sunny days, cloudy days and hazy days in Xi’an shows that the performance of this multi-wavelength Lidar can fully meet the requirements of all-weather and tropospheric aerosol particle detection in the troposphere.