采用原子滤光的激光雷达白天探测技术

在已有的双波长高空探测激光雷达的基础上,通过采用钠原子滤光器技术以及配合相应的关键技术,使得其中的钠层荧光通道具有了白天探测能力。由于钠原子滤光器极窄的滤光带宽和极强的带外抑制,使得即使在中午太阳背景光最强的时段,也能以光子计数方式探测到80～110 km高空钠层的微弱回波信号。实验观测结果表明,该技术已具备了对高空钠层的全时段探测能力,从而使利用激光雷达对我国高层大气进行24 h连续探测研究成为可能。

Daytime Observation Technology of Lidar by Using Atomic Optical Filter

Basing on the dual-wavelength high altitude detecting lidar that we have developed, the daytime observation ability has been realized in its sodium fluorescence channel by employing Na (sodium) atomic optical filter and other relevant technologies. Because of very narrow passband and very high out-of-band suppression of the Na atomic optical filter, the lidar echo at 80～110 km altitude can be obtained even in the noon-time when the background light from the sun is very strong. The ability of 24 hours continuous observation of the lidar system has been demonstrated by the preliminary observation result. This development makes the all time detection and investigation of high altitude atmosphere over our country becoming possible.