基于φ-OTDR的车辆振动信号检测方法  

Vehicle vibration signal detection method based onφ-OTDR

作　　者：熊显名[1] 郭逸璇 曾创 杜浩 陈聪 XIONG Xianming;GUO Yixuan;ZENG Chuang;DU Hao;CHEN Cong(Guangxi Key Laboratory of Optoelectronic Information Processing,Department of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin Guangxi 541004,China)

机构地区：[1]桂林电子科技大学电子工程与自动化学院,广西光电信息处理重点实验室,广西桂林541004

出　　处：《激光杂志》2024年第7期85-90,共6页Laser Journal

基　　金：广西重点研发计划项目(No.AB22035047);国家科技重大专项课题(No.2017ZX02101007-003);国家自然科学基金(No.62205076);国家自然科学基金(No.61965005);广西自然科学基金(No.2019GXNSFDA185010);国家重点研发计划项目(No.2022YFF0605502)。

摘　　要：针对相位敏感光时域反射计(Phase Sensitive Optical Time Domain Reflectometer,φ-OTDR)系统在车辆振动信号检测中信号信噪比低且检测准确率受频率影响的问题,提出了一种引导边缘滤波检测(Guided Edge Filter,GEF)方法。GEF方法在减少噪声影响的同时保留并提取出有效的振动位置信息。使用PZT分别产生不同频率的振动信号,将GEF方法与直接振幅差分法进行实验对比。结果表明,使用GEF方法得到的平均信噪比相较于直接振幅差分法提高了3.26 dB。使用公路上行驶车辆的振动信号进行测试,结果表明,使用GEF方法得到的信噪比最高为3.98 dB,比直接振幅差分法提高了2.65 dB。In response to the problem of low signal-to-noise ratio and frequency dependent detection accuracy in the detection of vehicle vibration signals using a phase sensitive time-domain reflectometer(Phase Sensitive Optical Time Domain Reflectometer,φ-OTDR)system.A Guided Edge Filter(GEF)method has been proposed.The GEF method preserves and extracts effective vibration information while reducing the impact of noise.Use PZT to generate vibration signals of different frequencies.Compare the GEF method with the direct amplitude difference method experimentally.The results show that the signal-to-noise ratio obtained using the GEF method has an average improvement of 3.26 dB compared to the direct amplitude difference method.Using the vibration signals of vehicles driving on the road for testing,the results show that the highest signal-to-noise ratio obtained using the GEF method is 3.98 dB,which is 2.65 dB higher than the direct amplitude difference method.

关 键 词：相位敏感光时域反射计 车辆检测 信号处理 信噪比 

分 类 号：TN249.1[电子电信—物理电子学]