Development of new laser remote sensing method for global environmental problem

在这项研究中，我们提出了一种新的激光测距技术，利用混沌激光信号的相关。混沌信号由R、L和二极管电路产生。一个可见的激光二极管被这个信号调制。用分束器对混沌调制激光进行分束。其中一束是直接检测的，另一束是通过光纤或露天检测的。我们可以通过测量两个检测信号的相关性来测量波束的延迟。首先，我们利用混沌调制的激光二极管进行了初步的实验。当调制信号为2MHz时，一次测量的往返路径长度误差为0.6m。我们假设产生误差的主要原因是AD转换的采样率。然后对信号处理系统进行了改进，并再次进行了露天实验。往返路径长度误差提高到0.1m。本文报道了利用混沌调制激光二极管在空中进行激光测距的实验结果。利用混沌调制激光二极管系统的测量信号，通过数值实验对多路光路的监测效果进行了评价。结果表明，该系统可实现10条光路的复用。

In this research, we proposed a new laser ranging technique using the correlation of chaotic laser signals. Chaotic signal was produced by R, L and diode circuit. A visible laser diode was modulated by this signal. Chaotically modulated laser was divided by a beam splitter. One beam was directly detected and the other one was detected via an optical fiber or open air. We can measure the delay of beam by taking the correlation of two detected signals. First, we carried out the preliminary experiment for raging using a chaotically modulated laser diode. When the modulation of signal was 2MHz, error in the round-trip path length was 0.6m in one measurement. We assumed that the main cause of error was the sampling rate of AD conversion. Then the signal processing system was improved and the open-air experiment was carried out again. The error in the round-trip path length was improved to be 0.1m. In this paper we report the results of laser ranging experiment in the air using chaotically modulated laser diode. The monitoring of multiplex optical paths was also evaluated by numerical experiment using the measured signal of our chaotically modulated laser diode system. It was found that 10 optical paths can be multiplexed using our laser diode system.