Multiplexing of Double Cladding Fiber Sensors for Bending Sensor

摘要

We propose a multiplexing bending sensor system based on a special double cladding fiber (DCF). Based on the filter characteristic of the DCF transmission spectrum and the narrow band of distributed feedback laser pulse, the intensity changes can indicate the variation of measurand. A sensing scheme with four sensor heads in parallel is investigated in experiment. The variation of sensors output was directly detected and the four channel sensing signals were separated by a certain optical path difference of the sensor heads. The experiment results show that the intensity of the sensing signals decreases monotonously with increasing the bending curvature radius. And we can get good performance between 0.0-1.8m~(-1) of the curvature radius.