基于分布式光纤振动传感技术的汽车排气管漏气检测方法研究  

Research on Detection Method of Leakage in Automotive Exhaust Pipes Based on Distributed Fiber Optic Vibration Sensing Technology

作　　者：杨鉴 陈明 Yang Jian;Chen Ming(Anhui University of Science and Technology,Huainan 232001;Shenzhen University,Shenzhen 518060)

机构地区：[1]安徽理工大学,淮南232001 [2]深圳大学,深圳518060

出　　处：《汽车工程师》2024年第11期20-24,共5页Automotive Engineer

摘　　要：针对汽车尾气泄漏检测问题,提出一种基于分布式光纤振动传感检测技术的尾气泄漏检测方法。首先,通过在汽车尾气管上安装传感器捕捉尾气泄漏引起的局部气压扰动导致的光纤光信号强度和相位变化,采用基于双马赫-曾德尔干涉结构的分布式振动传感系统和微分交叉算法解调双端振动信号,其次,利用互相关时延算法精确定位泄漏位置,在仿真测试中通过压电陶瓷装置模拟泄漏情况,设置2m光纤长度,实现了0.01m的定位精度,验证了所提出方法的可行性。To tackle the challenge of exhaust gas leak detection,this paper proposes an exhaust gas leakage detection method based on distributed fiber optic vibration sensing technology.Firstly,sensors are mounted on the vehicle’s exhaust pipe to detect variations in both intensity and phase of the optical fiber light signal,which arise from local pressure disturbances associated with exhaust gas leaks.A distributed vibration sensing system that utilizes a dual Mach-Zehnder interferometer setup is applied with a differential cross-correlation algorithm for demodulating vibrations captured at both ends.Secondly,a cross-correlation delay algorithm is used to precisely pinpoint any leakage locations.In simulation test,leak scenarios are emulated using a piezoelectric ceramic device along with a designated fiber length of 2 m,achieving remarkable positioning accuracy of 0.01 m and validating the feasibility of this proposed method.

关 键 词：尾气泄漏检测 分布式光纤传感 双马赫-曾德尔干涉仪 互相关时延定位 

分 类 号：U461.91[机械工程—车辆工程]