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Automated optical inspection

Automated Optical Inspection (AOI) is an automated visual inspection of printed circuit board (PCB) manufacture where a camera automatically scans the device under test for both failure and quality defects. It is mostly used in the manufacturing process because it is a non-contact test method. It  can be implemented at many stages through the manufacturing process including bare board inspection, solder paste inspection (SPI), pre- and post-reflow as well as other stages.