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The principles and design of range-gain-control gated PMT

In airborne underwater lidar applications, the reflecting light signal from the sea level is stronger than the one from the underwater object, the returned signal is decreased with the range as exponential and inverse square law and the backscattering return is very large. So the dynamic range could reach five to six orders of magnitude in few hundreds of nanoseconds. Therefore, it is necessary to compress the signal dynamic range to match the range of the digitizing or processing devices, typically 2 or 3 orders of magnitude, and to eliminate the reflecting light signal from the sea level and the backscattering. In this paper, we present a Range-Gain-Control Gated PMT method for this problem. The principal and the design of the Range-Gain-Control Gated PMT system are analyzed and discussed. The experiment results show that this method can complete the gated and the gain-control of the PMT.