Dual Parameter Simultaneous Measurement Of Fiber Grating Sensor Research

The Fiber Bragg Grating (FBG) is a new fiber-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 fiber-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.This paper focuses on cross-sensitivity effect between temperature and strain of optical fiber grating and the design program is given. Firstly, the recent developments in the fiber grating sensing area of temperature and strain simultaneous measurement, key technology and the problems concerning optical fiber grating sensing technology are analyzed. Secondly, the sensing principle of temperature and strain of optical fiber grating as well as the sensing projects are summarized. Thirdly, the sensing principle of both parameters is characterized. The existing projects for temperature and strain simultaneous measurement as well as their benefits and shortcomings are summarized and analyzed. Finally, the sensor based on temperature and strain simultaneous measurement by spring tube and Cantilever is designed. By pasting one FBG on beside of the cantilever, the temperature and strain simultaneous measurement can be obtained.