物体表面的反射散射光的强度反映了表面粗糙度的信息 ,即反射散射光的强度与表面的粗糙程度和探测光纤与反射表面之间的距离有关 .利用光纤将被测表面的反射散射光接收 ,测出了反射散射光强度与距离、粗糙度的关系 ,用最佳拟和曲线法计算出 Ra 与光强之间的关系 The intensity of the reflected scattered light on the surface of the object reflects the information on the surface roughness, ie the intensity of the reflected scattered light is related to the roughness of the surface and the distance between the detecting fiber and the reflecting surface. The reflected scattered light of the measured surface is received by the optical fiber , The relationship between the intensity of the reflected scattered light and the distance and the roughness was measured, and the relationship between Ra and the light intensity was calculated by the best fit curve method