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1kHz的单音信号及200~900Hz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12km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。
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.
作者
王宇
靳宝全
张建国
王东
张明江
王安帮
王云才
Wang Yu1, Jin Baoquan1,2, Zhang Jianguo1, Wang Dong1, Zhang Mingjiang1, Wang Anbang1, Wang Yuncai1,2(1 Key Laboratory of Advanced Transducers and Intelligent Control System of Ministry of Education Taiyuan University of Technology, Taiyuan, Shanxi 030024, China; 2 State Key Laboratory of Coat and CBM Co-mining, Jincheng, Shanxi 048000, Chin)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2018年第3期184-191,共8页
Acta Optica Sinica
基金
国家自然科学基金(51504161)
山西省重点研发计划社会发展项目(201703D321037)
山西省煤层气联合研究基金(2015012005
2016012011)
山西省应用基础研究项目(201701D221115)
山西省回国留学人员科研资助项目(2016-035)
关键词
传感器
光纤光学
混沌激光
光纤传感
声音检测
激光干涉
sensors
fiber optics
chaotic laser
optical fiber sensing
sound detection
laser interference
