本文介绍了一种用于测量表面粗糙度的漫射反射比光纤传感器，阐述了它的结构、工作原理、实验结果和特点。它能成功地消除待测表面反射率的变化和光源功率不稳定对测量结果的影响。除用于测量表面粗糙度外，还可用来测量微小位移 In this paper, a diffuse reflectance optical fiber sensor for measuring the surface roughness is introduced. Its structure, working principle, experimental results and characteristics are described. It successfully eliminates the effects of variations in surface reflectance and power instability on the measurement results. In addition to measuring the surface roughness, but also can be used to measure the tiny displacement