The full name of AOI is AutomaticOpticInspection, which is based on optical principle to detect common defects encountered in welding production. AOI is a new testing technology in recent years, but it has developed rapidly. At present, many manufacturers have introduced AOI testing equipment.

In the process of automatic inspection, the machine automatically scans the PCB through the camera and collects images. Compare the tested solder joints with the qualified parameters in the database. After image processing, detect the defects on PCB, and display/mark the defects through display or automatic sign for maintenance personnel.