By using the extremely sensitive R4632 photomultiplier tube and the photon counting system, the lidar system achieved higher signal to noise ratios of Raman and Rayleigh signals.

• 为提高瑞利和喇曼微弱回波信号信噪比，采用了极高灵敏度的R4632光电倍增管和光子计数技术；