Zhao Y
Cooperative Institute for Research in Environmental Sciences, University of Colorado, National Oceanic and Atmospheric Administration, Mail Stop RyEyET2, 325 Broadway, Boulder, Colorado 80303, USA.
Appl Opt. 1999 Jul 20;38(21):4639-48. doi: 10.1364/ao.38.004639.
Signal-induced bias (SIB) superimposed on the tail of lidar signals detected by photomultiplier tubes (PMT's) has long been recognized as significant interference in lidar data retrieval. Analysis of the data from a lidar transmitting in the horizontal direction revealed that SIB is a well-shaped pulse and is thus called a signal-induced pulse (SIP). The SIP starts near the end of the signal and has an exponentially decaying tail. The decay time constant is negatively correlated with the pulse rise time. The origins of afterpulses discussed in the literature could not explain the cause of the SIP. This research leads to the hypothesis that the SIP is the fluorescence emitted from the PMT wall that is impinged by ions in the PMT. A model was developed, and the results show good agreement with the data. This model is applied to remove SIP's during processing of data from an ozone-profiling lidar.
叠加在光电倍增管（PMT）检测到的激光雷达信号尾部的信号诱导偏差（SIB）长期以来一直被认为是激光雷达数据反演中的重大干扰。对水平方向发射的激光雷达数据的分析表明，SIB是一个形状良好的脉冲，因此被称为信号诱导脉冲（SIP）。SIP在信号接近尾声时开始，并有一个指数衰减的尾部。衰减时间常数与脉冲上升时间呈负相关。文献中讨论的余辉起源无法解释SIP的成因。本研究提出了一个假设，即SIP是由PMT中的离子撞击PMT壁而发出的荧光。开发了一个模型，结果与数据显示出良好的一致性。该模型被应用于在处理来自臭氧探测激光雷达的数据时去除SIP。
