激光在物体表面涂层均匀度探测中的应用

针对物体表面涂层的不均匀情况,采用激光对物体表面进行非接触测量,它能实现对物体表面微观变化的在线检测。通过光斑对被测表面扫描,分析反射光强的变化,获得了反射光强与物体表面涂层均匀度的关系。物体表面的涂层均匀度具有随机性,对光的反射程度也有所不同,依据接收光信号的变化,用计算机仿真得到被测物体表面的形貌特征,仿真结果能反映表面涂层均匀度的变化趋势。实验表明,系统结构简单、原理直观,检测范围1～80 μm,精度小于5 μm。

Application of Laser in the Measurement of Object Surface Coating Uniformity

Aiming at the nonuniformity of object surface coating, laser is adopted in contactless measurement of object surface. By this way, online detection of microcosmic variations in the object surface is realized. Through scanning over the object surface with a light spot and analyzing the variation of intensity of reflected light, the relationship between reflected light intensity and object surface coating uniformity can be obtained. Uniformity of object surface coating is radom, and the reflectivity is different on the surface. The appearance features of object surface to be measured are emulated by computer, and the simulated results can reflect the change tendency of surface coationg uniformity. Experimental results prove that the measurement system has simple structure and intuitionisticprinciple, and precision of measurement value is less than 5 μm within an operation scope from 1～80 μm.