Three dimensional curve reconstruction based on fiber Bragg grating sensors

Nowadays pipeline inspection needs sensors increasingly which can measure long distance and in small diameter. Fiber Bragg grating (FBG) sensors just have the conditions needed for pipeline inspection. Meanwhile, FBG sensors have powerful networking features, and it can be taken to build real-time monitoring system of piping shape. The FBG sensors can calculate the coordinate values in any position relative to the origin point by sensing changes in wavelengths. This paper analyzes the arrangement of the FBG curve reconstruction networking strategies. It introduces the three-dimensional curve reconstruction algorithm in detail. At the same time a prototype sensor is produced. By experiments we derive that the largest absolute reconstruction error is 1.45cm under a strain of 3125με. This paper has laid the foundation for future improvement work.