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性。混沌信号由R、L和二极管电路产生。这个信号调制了一个可见的激光二极管。混沌调制激光器通过分束器进行分束。一束光束被直接探测，另一束光束通过光纤或露天探测。通过对两个探测信号进行相关处理，可以测量出波束的时延。首先，我们利用混沌调制的激光二极管进行了狂暴的初步实验。当信号调制频率为2 MHz时，一次测量的往返路径长度误差为0.6m。我们假设误差的主要原因是AD转换的采样率。然后对信号处理系统进行了改进，重新进行了露天实验。改进后的往返路径长度误差为0.1m。本文报道了利用混沌调制激光二极管在空气中进行激光测距的实验结果。利用我们的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进行了评估。结果表明，利用我们的激光二极管系统可以实现10路光路的多路复用。

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.