摘要
为了提高自动光学检查(AOI)系统的性能,对AOI光源进行了研究。介绍了AOI光源的结构设计方法,光源由红、绿、蓝3种不同颜色,不同照射角度的LED阵列组成。然后,建立了光源的照度模型以及焊点的反射模型。最后,根据简化的照度模型对光源的几何参数进行优化。仿真和实验结果表明,所设计的光源在检测无铅焊点时同样有效,并能使不同类焊点间的特征距离更大,最大为半球形光源照射下的11.88倍,从而提高了特征在无铅焊点缺陷检测的分辨能力,验证了光源设计的有效性。
In order to improve the performance of Automatic Optical Inspection （AOI） system, an illuminator for leadless tin solder joint inspection was studied. The structure of the illuminator was introduced,which is composed of the LED arrays with three colors and different radiation angles. Then, the radiance model of the illuminator and the irradianee model of the solder joint were developed. Finally, the dimensions of the illuminator were optimized based on the irradianee model. The simulation and experimental results verify the validity of proposed illuminator for leadless solder joint inspection, and show it can enlarge the feature distances from different classes. The maximum feature distance of different solder joints illuminated by the proposed illuminator is 11.88 times of that illuminated by the hemisphere illuminator. The simulation and experimental results verify the validity of the design.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2008年第8期1377-1383,共7页
Optics and Precision Engineering
基金
粤港关键领域重点突破招标项目(No.20061682)
广东省
教育部产学研结合资助项目(No.2006D930304001)
关键词
自动光学检测设备
发光二极管
光源
机器视觉
焊点检测
Automatic Optical Inspection（AOI）
LED
illuminator
machine vision
solder joint inspection
