Study On Fiber Bragg Grating Stress Senor

The Fiber Bragg Grating (FBG) is a new fibre-optical device, and is widespread used in fiber-optic communications, fiber sensing, and so on. At present, the fabrication and application of FBG is the focus and priority of fibre-optical technology studies in the world.Fiber Bragg grating (FBG) sensor, which uses the property that the Bragg wavelength is sensitive to temperature and strain, is a new kind of fiber optic sensor. In addition to having the same functions as the traditional electric sensors, the FBG sensor also has some special characteristics such as distributed sensing, immune to electromagnetic interference, high precision and long-term stability. So it has widely applicable perspective in many fields such as the structure monitoring of large compound material and concrete, the performance monitoring of the intelligent materials, electrical power industry, medicine industry, chemical engineering etc. Stress measurement is an important kind application of FBG sensing.According to the existed researches, FBG has stable sensing properties, and it is an ideal kind of stress sensing element. And reasonable design for FBG stress sensing probe is necessary, and then it can meets practical requirements of engineering project. So reasonable design of FBG pressure sensor probe and sensor packaging methods is important at present. The paper reviews the sensing principle and the characteristics of FBG, and designs a new FBG stress sensor. It is to glue the fiber grating on the side of cylinder, and put force on the top surface equally. At the same time , Monitoring the drifting of the FBG center wave length .It has been proved by the experiment that the responsibility linearity and repeatability of the FBG stress sensor are good. At last, it has been found that the pressure-sensitivity of experimental value agrees well with the theoretical value.Some work done in this paper is listed as follow:(1) It elaborated the principle of FBG and has done some systematic research on the stress and temperature sensing property of FBG; (2) Analysis of the current FBG pressure sensor technology, and design a new FBG pressure sensor;(3) Processing and analysis of experimental data.