机载激光测深光电倍增管变增益探测方法

PMT gain changing measurement for airborne laser depth sounding

对机载激光探测海水深度的大动态范围信号，提出了使用光电倍增管变增益探测方法来压缩其动态范围。给出了ＧＤＢ３３３，ＧＤＢ４９，Ｒ１３３３光电倍增管增益控制特性，压缩信号动态范围达２．５×１０４倍，满足了机载激光测深系统的要求。使用光电倍增管变增益探测方法探测到的海底回波，也在文中进行了报道。

The return signals from airborne laser depth sounding have dynamic ranges that exceed the capabilities of the sequential measurement equipments.The study on gain controlling of photomutiplier tubes(PMT) GDB 333,GDB 49 and R1333 have been carried out.The results show that the signal dynamic range can be compressed to 2.5×10 4 orders by controlling the electric potential of grid and eletromutiplier electrode.The method of changing PMT gain to detect signals from sea bottom is very compatible to airborne laser depth sounding.