基于EFPI地声传感器的信号解调算法  

Signal demodulation algorithm based on EFPI geoacoustic sensor

作　　者：田培廷 赵英亮 王黎明[1] 吴博 徐亮 TIAN Peiting;ZHAO Yingliang;WANG Liming;WU Bo;XU Liang(Institute of information detection and processing technology,North Uniersity of China,Taiyuan 030051,China)

机构地区：[1]中北大学信息探测与处理技术研究所,太原030051

出　　处：《光通信技术》2020年第11期20-23,共4页Optical Communication Technology

摘　　要：地声主要为频率集中在0~20 Hz的次声波,对传感器灵敏度、精确度及频响特性具有较高要求,合理的信号解调方法是传感器研究的关键。提出了双波长单通道正交解调算法,根据光的干涉原理对基于非本征法布里-珀罗干涉(EFPI)地声传感器进行了敏感机理的理论分析,明确了传感器在工作时需满足在线性区域的要求,利用Matlab软件进行仿真分析,结果表明:该算法避免了外界环境造成的腔长变化对输出结果的干扰,可准确解调出原始信号,印证了该解调方法的可行性。The geoacoustic is mainly infrasonic wave whose frequency is concentrated in 0~20 Hz,which has high requirements on the sensitivity,accuracy and frequency response characteristics of the sensor,reasonable signal demodulation method is the key of sensor research.A dual wavelength single channel quadrature demodulation method is proposed.According to the interference principle of light,the sensitive mechanism of the extrinsic geoacoustic sensor based on extrinsic Fabry-Perot interferometric(EFPI)is theoretically analyzed,it makes clear that the sensor needs to meet the requirements in the linear region when working,and the simulation analysis is carried out by using Matlab software.The simulation results show that the algorithm can avoid the influence of external environment on the output results,and can accurately demodulate the original signal,which proves the feasibility of the demodulation method.

关 键 词：法布里-珀罗腔 地声传感器 正交解调法 

分 类 号：TN911.7[电子电信—通信与信息系统]