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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。
Based on the existing dual-wavelength high-altitude exploration lidar, the sodium-based fluorescence channel and the corresponding key technology are adopted to make the sodium layer fluorescence channel have daytime detection capability. Due to the extremely narrow filter bandwidth and strong out-of-band rejection of sodium-atomic filters, photon counting can detect weak backs of 80-110 km altitude sodium layer, even during the strongest midday sun exposure Wave signal. Experimental observations show that the technology has the ability to detect the full-time high-altitude sodium layer, making it possible to use 24-h continuous exploration of lidar in China’s upper atmosphere.