单模光纤振动信号监测

Single mode fiber vibration signal monitoring

分布式光纤传感技术应用广泛,为了利用单模光纤中的双折射变化规律进行振动信号监测,综合考虑了单模光纤中波导形状双折射、应力双折射以及振动引起的动态应变双折射等因素,建立了基于琼斯矩阵和斯托克斯矢量分析方法的单模光纤振动监测模型,仿真和实验分析了模型对10 Hz正弦与方波振动信号的响应。仿真实验结果表明:该模型可以识别光纤所受振动信号的类型和频率。

Distributed optical fiber sensing technology is widely used.In order to use the variation law of birefringence in single mode fiber for vibration signal monitoring,considering the factors such as waveguide shape birefringence,stress birefringence and dynamic strain birefringence caused by vibration in single mode fiber,a single mode fiber vibration monitoring model based on Jones matrix and Stokes vector analysis method is established,the response of the model to 10 Hz sinusoidal and square wave vibration signals is analyzed by simulation and experiment.The simulation results show that the model can identify the type and frequency of vibration signal received by optical fiber.