一种基于布拉格光栅的水压传感器设计 Design of Water Pressure Sensor Based on Prague Grating

本文提出了一种基于金属膜片与布拉格光纤光栅(FBG, Fiber Bragg Grating)相结合的水压检测装置，该传感器采用管体增敏封装结构，工作过程为水压推动膜片带动推动光纤光栅，使光栅产生形变，引起FBG的中心波长产生漂移，通过解调光栅波长就可以实现对水压的感知。通过对传感器结构中膜片受力过程有限元分析，获得了该传感器结构模型，并给出传感器设计参数。此传感器具有体积小、结构简单和易于组网等优点，可以应用于煤矿水压监测、坝体渗水及水位监测等。 In this paper, a kind of water pressure sensor based on metal diaphragm and FBG fiber grating (FBG) is proposed with a tube shape of sensitive increasing package structure. Its working process is that the water pressure can be gotten from the FBG central wavelength drift, which coming from the deformation of the diaphragm connecting with the FBG. A serious of the diaphragm deformation processes in this sensor structure is simulated by finite element analysis method. The sensor structure model is obtained and the sensor design parameters are gotten. This kind of water pressure sensor has the advantages of small size, simple structure and easy networking. It can be applied in coal mine water pressure monitoring, dam body seepage and water level monitoring, etc.