Sensing principle and optimization of curvature optical fiber sensor

To better understand the working principle and improve the performance of the curvature optical fiber sensor,the ray tracing simulation was carried out by using the optical analysis software TracePro,which provides the sensing process.The modulation principle of sensitive zone to light intensity was described by using geometric optics analysis method.The mathematic model of relations among light loss,parameters of sensitive zone′s configuration and bending curvature was presented.Experiments were performed to validate the effectiveness of the proposed mathematic model.The rays will concentrate to the convex side of the bending fiber.That is,the light intensity will increase at convex side while decrease at concave side,which leads to the changes of light leakage at sensitive zone and realizes the modulation to light intensity.