Automated Optical Inspection (AOI) 

What is AOI?

Automated Optical Inspection (AOI) is a technique used to ensure the flawless execution of PCB assemblies with unprecedented accuracy. Leveraging advanced optical technologies and sophisticated algorithms, AOI is designed to scrutinize the components on the surface of PCB assemblies with meticulous attention to detail.

How does AOI work?

At the heart of AOI lies a complex system of high-resolution cameras and advanced optics. These cameras capture detailed images of the PCB assembly's surface, creating a visual representation that serves as the basis for thorough inspection. As the PCB assembly moves through the AOI machine, the cameras capture multiple images from different angles and lighting conditions, this multi-perspective approach enhances the system's ability to detect a wide range of defects with precision.

The acquired images undergo sophisticated pre-processing algorithms to enhance clarity and remove any artifacts that might interefere with the inspection process. This step ensures that the inspection is based on clean and accurate data. AOI relies on reference data, typically generated from the original design files (Gerber files) or a golden sample, to establish the expected appearance of a defect-free PCB assembly. The captured images are then compared to this reference data to identify any deviations or anomalies.

Advanced defect recognition algorithms analyze the images pixel by pixel, identifying variations, irregularities, and defects in the PCB assembly. These algorithms are designed to recognize various types of defects, including solder joint issues, component misplacements, polarity errors, and more.

Detected defects are classified based on their severity and relevance to the functionality of the PCB assembly. The AOI system generates detailed reports that highlight the location, type and size of defects, enabling quick and informed decision-making for quality control teams.

In essence, AOI is a combination of cutting-edge optics, sophisticated algorithms, and intelligent machine learning, all working seamlessly to scrutinize the surface of PCB assemblies with unparalleled precision. As technology advances, AOI continues to evolve, setting new standards for quality control in electronic manufacturing and ensuring that every PCB that rolls off the assembly line meets the highest levels of reliability and performance.

To find out more about our AOI processes, contact our friendly team today.