摘要
分布式光纤声波传感(DAS)是一种新型光纤声感知技术。该技术的作用机理是声学信号在分布式光纤上产生微弱的形变,从而引起光纤折射率的变化。光在传输过程产生相干效应,DAS对于正交分量信号不敏感,很难用一根直的水平光纤探测这类信号。本文主要对DAS探测声学信号探测灵敏度进行研究,采用ANSYS仿真软件分析声场对不同物理模型声学信号的感知能力,对物理模型结构最佳方案进行分析,设计出具有对声音高感知能力的物理模型。实验验证结果表明,平均提升了3.94%的信号幅值。经过信号解调去噪处理,得出设计的特种光纤高感知结构可以有效的获得更好的声学信号采集质量。
The distributed optical fiber acoustic wave sensing(DAS) is a new kind of optical fiber acoustic sensing technology. Its mechanism is that the acoustic signal generates a weak deformation on the distributed optical fiber, which causes the change of the refractive index of the optical fiber. Light produces coherent effects during transmission. DAS is not sensitive to quadrature component signals. It is difficult to detect such signals with the straight horizontal optical fiber. In this article, the sensitivity of DAS detection acoustic signal detection is mainly studied. The ANSYS simulation software is utilized to analyze the sound field′s ability to perceive acoustic signals of different physical models. The best solution of the physical model structure is analyzed, a physical model with high sound perception ability is formulated. Experimental results show that the signal amplitude is increased by 3.94% on average. After signal demodulation and denoising processing, it is concluded that the designed special optical fiber high-sensing structure can effectively achieve better acoustic signal acquisition quality.
作者
余双勇
衣文索
陈昊玥
韩冬子
王鑫睿
Yu Shuangyong;Yi Wensuo;Chen Haoyue;Han Dongzi;Wang Xinrui(College of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130012,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2021年第3期59-69,共11页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(61805022)项目资助
关键词
分布式光纤声波传感
ANSYS仿真
相位敏感光时域反射仪
声学信号
distributed optical fiber acoustic wave sensing
ANSYS simulation
phase sensitive optical time domain reflectometer
acoustic signal
