Research on optical fiber shape restoration algorithm based on distributed strain measurement
In order to verify the feasibility and accuracy of parallel transmission frame to restore the shape of the optical fiber sensor,the shape sensor based on single-mode optical fiber is designed,the modeling of the shape sensor and the extraction of distributed strain information by using finite element analysis method are proposed,and the restoration precision of parallel transmission frame and Frenet-Serret frame under different bending shapes and different strain sampling points of the shape sensor are compared and analyzed.The results show that when the shape of the sensor is restored by parallel transmission frame,not only the shape of sensor is well restored,which makes up for the sudden change in the direction of Frenet-Serret frame before and after the singularity position,causing a large error in the restoration result.The top position error of parallel transmission frame is less than 0.003 5％of the total length of fiber,which is 10 times lower than that of Frenet-Serret frame.
single-mode fibershape sensorparallel transmission frameshape sensingfinite element analysis
万方数据
维普
