Abstract: In order to determine the optimal light source position parameters of visual inspection system for high reflective metal processing size,processing accuracy and surface quality,an optical system optimization design model based on non-imaging optics theory is proposed. According to the principle of illumination uniformity and Taguchi experimental design method,the optical system of high reflective metal surface visual inspection is optimized by adjusting the light source position parameters ( the irradiation angle of the light source,the inclination angle of the light source and the distance of the light source). The results show that under the optimal light source position parameters,the uniformity and standard deviation of the illuminance distribution in the field of view imaging plane are 88.89 % and 0.036 2,respectively. Combined with the imaging experimental results,it can be seen that the illuminance uniformity of the high reflective metal surface under the optimal light source position parameters is better,which is helpful to the high-quality imaging of the visual inspection of the high reflective metal surface,and provides technical support for the improvement of the visual inspection accuracy of the high reflective metal surface.

Key words: high reflective metal, visual inspection, optical system, illumination uniformity