基于混沌激光的水下测距与分布式光纤传感

发布时间：2018-03-31 03:21

  本文选题：混沌激光　切入点：混沌相关法　出处：《太原理工大学》2017年硕士论文

【摘要】：混沌激光具有类噪声、宽带、强抗干扰性等特性,已被认为是激光雷达、时域反射仪、分布式光纤传感等领域理想的探测信号,已经成功实现自由空间测距、光纤断点监测、甚至电缆故障的监测。本文旨在探索混沌激光的新应用,将混沌信号及其相关法拓展至水下探测领域;借鉴不同的光纤传感技术,进一步发展混沌激光在光纤传感领域的应用,主要工作及进展如下:1)提出一种用于水下测距的混沌调制激光雷达方案。该方案利用布尔混沌电路产生的混沌电信号调制半导体激光器获得的532 nm混沌激光作为探测光并结合相关法,在1.5 m×0.3 m×0.3 m的水槽中进行了原理性实验验证,获得的最小和最大探测距离分别为0.14 m和1.36 m,距离分辨率为51 cm,目标测距结果的平均误差在2.3 cm以内。该混沌调制激光雷达具有测量盲区小、结构简单的特点,可作为一种新的水下目标测距技术。2)提出并实验验证了一种用于分布式光纤传感的混沌布里渊光相干域分析系统。低相干态的混沌激光可以确保系统获得高的空间分辨率。系统采用数字光功率计来同步地获取与温度相关的布里渊增益谱,这种方法有别于传统的实时示波器采集法,可以有效地消除电子噪声从而提高系统的传感范围。系统成功地在906 m的待测光纤上实现了3.92 cm的空间分辨率,并获得了1.24 MHz/℃的温度系数。
[Abstract]:Chaotic laser has the characteristics of noise-like, wideband, strong anti-jamming and so on. It has been considered as the ideal detection signal in the fields of lidar, time-domain reflectometer, distributed optical fiber sensor and so on, and has been successfully realized in free space ranging, optical fiber breakpoint monitoring, etc. The purpose of this paper is to explore the new application of chaotic laser, to extend the chaotic signal and its correlation method to underwater detection, to further develop the application of chaotic laser in the field of optical fiber sensing by using different optical fiber sensing techniques for reference. The main work and progress are as follows: 1) A chaotic modulation laser radar scheme for underwater ranging is proposed. The chaotic signal generated by Boolean chaotic circuit is used to modulate the 532nm chaotic laser of semiconductor laser. Detecting light and combining the correlation method, The principle experiment was carried out in a 1.5 m 脳 0.3 m 脳 0.3 m flume. The minimum and maximum detection ranges are 0.14 m and 1.36 m, respectively, and the range resolution is 51 cm. The average error of the target ranging results is within 2.3 cm. The chaotic modulation lidar has the characteristics of small blind area and simple structure. A chaotic Brillouin optical coherent domain analysis system for distributed optical fiber sensing is proposed and experimentally validated as a new underwater target ranging technique. Interresolution. The system uses a digital optical power meter to synchronously acquire the temperature dependent Brillouin gain spectrum, This method is different from the traditional real-time oscilloscope acquisition method and can effectively eliminate electronic noise and improve the sensing range of the system. The system successfully achieves a spatial resolution of 3.92 cm on the 906 m optical fiber to be tested. The temperature coefficient of 1. 24 MHz/ 鈩，

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