基于φ-OTDR系统的二维空间定位方法  

Two dimensional space positioning method based on φ-OTDR system

作　　者：李嘉敏 秦祖军[2] LI Jiamin;QIN Zujun(School of Electronic Engineering and Automation,Guilin University of Electronic Technology,Guilin 541004,China;School of Optoelectronic Engineering,Guilin University of Electronic Technology,Guilin 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,广西桂林541004 [2]桂林电子科技大学光电工程学院,广西桂林541004

出　　处：《桂林电子科技大学学报》2024年第4期390-395,共6页Journal of Guilin University of Electronic Technology

基　　金：广西自然科学基金(2022GXNSFAA035638)。

摘　　要：研究了基于相位敏感光时域反射计(φ-OTDR)系统的声源二维(2D)空间定位的方法,该方法利用差分解调相位(DUP)方式来提取由传感光纤测得的相位。DUP方式解调的相位比常规的解调差分相位(UDP)方式解调的相位更平滑,并且DUP方式可以高保真地对扰动事件的时域信号进行还原,解决了对于非扰动点处UDP方式所获相位不是零相位而导致的信号失真等问题。通过声源2D定位实验对该方法进行验证,实验结果表明,DUP方式解调的相位用于声源2D定位的结果与实际结果基本相符,实验值与真实值的误差在X方向为0.09m,在Y方向为0.16m。研究结果表明,该方法能够增大相位信息的利用率,提高声源定位的精度,在管道安全监测、边界安防、入侵警报等领域具有潜在的应用价值。A two-dimensional(2D)spatial location method of sound source based on phase sensitive optical time domain reflectome-ter(φ-OTDR)system was proposed.The method uses difference unwinding phase(DUP)method to extract the phase measured by sensing fiber.The phase demodulated by DUP method is smoother than that demodulated by UDP method,and DUP method can re-store the time-domain signal of disturbance event with high fidelity,which solves the problem of signal distortion caused by the non-zero phase of the phase obtained by UDP method at the non disturbance point.This method was verified by sound source 2D posi-tioning experiment,and the results show that the phase of DUP demodulation used for 2D location of sound source is basically con-sistent with the actual results.The error between the actual value and the real value is 0.09 m in X direction and 0.16 m in Y direc-tion.The results show that this method can increase the utilization rate of phase information,improve the accuracy of sound source location,and has potential application value in pipeline safety monitoring,border security,intrusion alarm and other fields.

关 键 词：相位敏感光时域反射计 相位解调 阵列信号处理 声源定位 

分 类 号：TN913.7[电子电信—通信与信息系统]