光学学报, 2018, 38 (3): 0328016, 网络出版: 2018-03-20   

基于混沌激光干涉的分布式光纤声音传感 下载: 553次

Distributed Optical Fiber Acoustic Sensing Based on Chaotic Laser Interference
作者单位
1 太原理工大学新型传感器与智能控制教育部重点实验室, 山西 太原 030024
2 煤与煤层气共采国家重点实验室, 山西 晋城 048000
摘要
提出了一种基于混沌激光干涉的分布式光纤声音传感系统, 利用外腔反馈式半导体混沌激光作为传感光源, 借助非等长的马赫-曾德尔双臂引入干涉光程差, 通过直线型Sagnac结构克服了环形干涉系统的互易效应, 利用频谱的零频点实现了声音信号的分布式定位。实验结果表明, 该系统可实时提取1 kHz的单音信号及200~900 Hz频率范围内的语音信号。与传统的宽带放大自发辐射激光相比, 基于混沌激光干涉的传感系统具有更好的声音频响曲线、更高的检测灵敏度以及均匀的平面指向性, 并在12 km长的单模光纤上实现了宽谱声音定位, 为分布式光纤声音传感系统提供了一种新的灵敏度提升方案。
Abstract
A distributed optical fiber acoustic sensing system based on chaotic laser interference is proposed, which uses the external cavity feedback semiconductor chaotic laser as the sensing light source, and the non-equal length of Mach-Zehnder arms for the introduction of the interference optical path difference. The reciprocal effect of the annular interference system is overcome by the linear Sagnac structure. The spectral null-frequency point is applied to realize the distributed location of sound signals.The experimental results show that, this system can real-time extract the single-tone signal with a frequency of 1 kHz and the voice signal in the frequency range of 200-900 Hz. Compared with the traditional broadband amplified spontaneous emission laser, this acoustic sensing system based on chaotic laser interference has a better sound frequency response curve, a higher detection sensitivity and a uniform plane directivity. Moreover, a broad-spectrum sound positioning in a 12 km single-mode fiber is achieved, which provides a new sensitivity enhancement solution for the distributed optical fiber acoustic sensing system.

王宇, 靳宝全, 张建国, 王东, 张明江, 王安帮, 王云才. 基于混沌激光干涉的分布式光纤声音传感[J]. 光学学报, 2018, 38(3): 0328016. Wang Yu, Jin Baoquan, Zhang Jianguo, Wang Dong, Zhang Mingjiang, Wang Anbang, Wang Yuncai. Distributed Optical Fiber Acoustic Sensing Based on Chaotic Laser Interference[J]. Acta Optica Sinica, 2018, 38(3): 0328016.

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