共焦自聚焦光纤传感器回波干扰抑制方法分析

基于共焦原理的自聚焦光纤传感器将共焦光路、自聚焦透镜和光纤集于一体，实现了微型化和轴向高分辨率的统一，可用于内外曲面的微观形貌、坐标尺寸和曲面轮廓等的高精度检测。运用高斯光束传输原理和矩阵光学理论对影响传感器信号强度的端面回波问题进行了理论分析，提出了解决回波问题的技术途径。实验结果说明，通过对不同端面采用不同的抑制方法，回波问题被较好地解决。

Theoretical Analysis of the Refraining Return-loss Interfere of the Reflective Confocal Fiber-Optic Sensor

The reflective optical sensor based on a confocal principle is made up of GRIN lens and optic fiber.It features miromation and high resolution and can be used for the measurement of mircostructure,microdimension and surface contours.A theoretical equation for calculating the return loss of fiber sensor with beveled end face and GRIN lens is derived with the Gaussian light beams transmission principle and matrix optics principle.The change of return loss with changing the fiber sensor parameter is explained.Some techniques to refrain return loss are presented.Experimental results agree with the theoretical analysis,and return loss is refrained with different methods to different faces.