微脉冲激光雷达系统实验观测及应用

Development and applications of a micropulse lidar

针对大气气溶胶监测的迫切需要,研制完成了用于大气气溶胶和云的结构与光学特性研究的微脉冲激光雷达系统。主要介绍了该激光雷达系统的结构和主要技术参数,发射系统采用重复频率为2.5 kHz、单脉冲能量为6μJ的二极管泵浦Nd:YAG激光器,接收系统采用20 cm口径的施密特-卡塞格林式望远镜、0.5 nm的窄带干涉滤光片及光子计数模式的光电倍增管。利用本系统对青岛地区对流层的大气气溶胶进行了观测,观测结果表明,该系统具备连续观测对流层大气气溶胶的能力,可以很好地反映气溶胶粒子的时间和空间分布特征。

For monitoring the atmospheric aerosol, a micropulse lidar （MPL） system was developed by Shandong Academy of Sciences Institute of Oceanographic Instrumentation （SDIOI） to investigate structural and optical properties of clouds and aerosol. The structure and main technical parameters of the MPL are introduced. The transmitter is based on a diode-pumped Nd：YAG laser which delivers up to 6μJ pulse energy at a pulse repetition rate of 2.5 kHz. The receiver utilizes a commercial 20 cm diameter Schmidt- Cassegrain telescope, a 0.5 nm narrowband interference filter, and a photon counting PMT detector. The system observed tropospheric atmospheric aerosol of Qingdao and the results show that the system can measure the tropospheric aerosol continuously and well reflect the space and time distribution of aerosol.