Research on FBG High Temperature Sensor Used for Strain Monitoring

Abstract

Strain sensing is widely used in safety monitoring of high temperature pressure pipes in oil companies and power plants. A novel high-temperature strain sensor was researched based on FBG(Fiber Bragg Grating) and the elastic high-temperature alloy in this paper. First, high-temperature Polyimide fiber FBG was prepared and tested in high temperature chamber. Second, a novel T strain gauge structure of three FBG was designed and fabricated on the elastic high-temperature alloy. This strain gauge could be applied in measurement of two-dimensional high-temperature strain sensing. In the end, a equi-intensity cantilever was adopted to test the high-temperature FBG strain sensor and testing results verified that the T type FBG strain sensor was suitable for high-temperature strain sensing with reliable performance in 300°C environment.

Optical Sensor by Utilizing the Injection Locking in the Er-doped Fiber Loop Laser

“…In this paper, an FBG sensor system with a multiwave-length erbium-doped fiber ring laser as the light source utilizing the injection locking technique is experimentally proposed [3] . In the sensor configuration, the FBG is not only a filter device, but also a sensing element.…”