基于双端Mach-Zehnder的电缆舞动监测系统设计  

Design of Seismic Wave Detection System Based on Double-Ended Mach-Zehnder

作　　者：衣文索[1] 寇汉鹏 聂大禹 冯振华 陈学峰 王普莫 YI Wensuo;KOU Hanpeng;NIE Dayu;FENG Zhenhua;CHEN Xuefeng;WANG Pumo(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,China;Mengdong Power Grid Company,Hohhot 010020,China)

机构地区：[1]长春理工大学光电工程学院,长春130022 [2]蒙东电网公司,呼和浩特010020

出　　处：《吉林大学学报（理学版）》2024年第5期1248-1253,共6页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:61675035)。

摘　　要：针对传统电缆舞动检测器在面对电磁干扰和持续供电时灵敏度低、信噪比差、安装复杂和需额外供电等问题,提出一种新型双端Mach-Zehnder(M-Z)电缆扰动监测系统.该系统采用双端光纤M-Z光路结构,可实现长距离、大尺度、多维度的在线监测和结构安全预警,从而实时定位舞动位置.该系统的检波器力学单元采用硅胶弹性体和黄铜质量块推挽式结构,经ANSYS软件进行参数化建模和有限元分析后,得出其固有频率为106.77 Hz,与实验所测数据的相对误差仅为1.65%.实验结果表明,该检测器在0~140 Hz内的相对灵敏度为41.25~66.78 dB (rad/Pa),对舞动信号具有较高灵敏度的检测能力.Aiming at the problems of low sensitivity,poor signal-to-noise ratio,complex installation,and the need for additional power supply of the traditional power grid dance detector in the face of electromagnetic interference and continuous power supply,we proposed a new double-ended Mach-Zehnder(M-Z)fibre optic seismic detection system.T he system adopted double-ended fibre optic M-Z optical path structure,which could achieve long-distance,large-scale,multi-dimensional on-line monitoring and structural safety warning to locate the position of the dance in real time.The geophone mechanical unit of this system adopted the push-pull structure of silicone elastomer and brass mass block,and after parametric modelling and finite element analysis by ANSYS software,its intrinsic frequency was determined t o be 106.77 Hz,with the relative error of only 1.65%compared to the experimental data.The experimental results show that the relative sensitivity of the dete ctor in the range of 0—140 Hz is 41.25—66.78 dB(rad/Pa),which confirms its ability to detect the high sensitivity of the dance signal.

关 键 词：M-Z干涉仪 光纤传感 推挽式结构 有限元分析 

分 类 号：TN247[电子电信—物理电子学]