曲率光纤传感器传感原理和参数优化

Sensing principle and optimization of curvature optical fiber sensor

为了更好地了解曲率光纤传感器的工作原理,进一步优化传感器的性能,利用TracePro光学软件对弯曲光纤中传播的光线进行光线追迹,采用几何光学方法描述敏感区对光强的调制原理,推导出光功率损耗与光纤弯曲半径、敏感区几何参数间关系的数学模型,并通过实验验证了其有效性。研究结果表明,在曲率光纤传感器中,光线在弯曲光纤中的传播路径表现出凸向集中性,即在弯曲光纤凸侧的光强会增加,而在凹侧的光强会减弱,这导致了敏感区对光泄漏的改变,从而实现光强调制。

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.