Bristow M P, Bundy D H, Wright A G
Appl Opt. 1995 Jul 20;34(21):4437-52. doi: 10.1364/AO.34.004437.
We present the results of a study that identifies a photomultiplier tube (PMT), divider networks, and gating circuitry for use in the current detection mode, in which the specific objectives were to hold variations in both signal gain over a 25-µs gate period and signal linearity up to 20 mA to less than ±0.1%. The study, aimed at optimizing the performance in a nadir-looking airborne UV differential absorption lidar, is sufficiently general to apply to other critical gated or pulsed PMT applications in which performance at the 0.1% level is required. Signal-induced gain increases peculiar to pulsed or gated signals from PMT's with BeCu dynodes that can have values between 1 and 10% over 25 µs were reduced to less than 0.1% by the use of a 2-in. (5.08-cm)diameter PMT (EMI 9214) with CsSb dynodes. Compliance with the linearity requirement was achieved for gated signals up to 8 mA at a current gain of ~10(7) with the EMI 9214 PMT controlled by a resistive divider network with an inverted taper, in which the linearity data showed no tendency toward overlinearity caused by either space charge effects or induced divider-network voltage changes.
我们展示了一项研究的结果，该研究确定了用于电流检测模式的光电倍增管（PMT）、分压网络和选通电路，其具体目标是在25微秒的选通周期内将信号增益变化以及高达20毫安的信号线性度保持在±0.1%以内。这项旨在优化向下直视机载紫外差分吸收激光雷达性能的研究具有足够的通用性，可应用于其他需要达到0.1%性能水平的关键选通或脉冲PMT应用。通过使用直径为2英寸（5.08厘米）、带有铯锑打拿极的PMT（EMI 9214），来自带有铍铜打拿极的PMT的脉冲或选通信号特有的信号诱导增益增加（在25微秒内可能在1%至10%之间）被降低到了0.1%以下。对于高达8毫安的选通信号，在电流增益约为10(7)的情况下，通过由具有反向锥度的电阻分压网络控制的EMI 9214 PMT实现了线性度要求，其中线性度数据未显示出由空间电荷效应或感应分压网络电压变化导致的超线性趋势。
