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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。
In order to better understand the working principle of the optical fiber sensor and further optimize the performance of the sensor, TracePro optical software is used to track the light propagating in the bent optical fiber. The geometrical optics method is used to describe the modulation principle of the sensitive region to the light intensity. Power loss and fiber bend radius, the geometric parameters of the sensitive area of the mathematical model, and verified by experiments its effectiveness. The results show that in the optical fiber sensor, the propagation path of the light in the bent fiber shows convex concentration, that is, the light intensity on the convex side of the bent fiber increases and the light intensity on the concave side decreases, which leads to Sensitive area of light leakage changes, in order to achieve light intensity modulation.