Key Points to Note About Automated Optical Inspection Systems (AOI)

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Despite some major improvements in technology, the need for automated optical inspection machines is still very high. With the advent of a surface mount technology and its subsequent reduction in size, these machines are now compact and much easier to use.

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KEY POINTS TO NOTE ABOUT AUTOMATED OPTICAL INSPECTION SYSTEMS (AOI):

KEY POINTS TO NOTE ABOUT AUTOMATED OPTICAL INSPECTION SYSTEMS (AOI)

KEY POINTS TO NOTE ABOUT AUTOMATED OPTICAL INSPECTION SYSTEMS (AOI):

KEY POINTS TO NOTE ABOUT AUTOMATED OPTICAL INSPECTION SYSTEMS (AOI) Despite some major improvements in technology, the need for automated optical inspection machines is still very high. With the advent of a surface mount technology and its subsequent reduction in size, these machines are now compact and much easier to use . An optical inspection machine is a quintessential tool in any integrated electronic test strategy, which ensures costs are maintained low and faults in product line can be detected early. The system or machine can be placed into any product line right after the process solder. It can then be used for detecting problems at the very onset of a process. This has plenty of advantages. As faults cost more to debug further along the process of production, this obviously becomes the most optimal place for finding faults.

BASICS OF AOI:

BASICS OF AOI AOI uses certain visual methods for monitoring printed circuit boards to find faults/defects. There are offline inspection machines and inline inspection machines in this category that can detect various surface feature defects like scratches, nodules and stains. They can even detect incorrect components, incorrectly placed parts and missing components. As such, these machines can perform all kinds of visual checks previously conducted by manual operators with better accuracy and speed. They can achieve this simply by visually scanning the board’s surface. Circuit boards are light by different light sources and HD cameras. The process of automated optimal inspection uses captured images that can be processed and further compared with knowledge of the chosen device. Using the method of comparison, the system can detect as well as highlight defects and suspect areas.

AOI UTILIZES VARIOUS TECHNIQUES FOR PROVIDING ANALYSIS OF WHETHER A CERTAIN CIRCUIT BOARD HAS ANY DEFECTS OR ARE SATISFACTORY. THESE METHODS INCLUDE::

AOI UTILIZES VARIOUS TECHNIQUES FOR PROVIDING ANALYSIS OF WHETHER A CERTAIN CIRCUIT BOARD HAS ANY DEFECTS OR ARE SATISFACTORY. THESE METHODS INCLUDE: Template matching technique, which utilizes circuits to compare the image obtained with the image from the golden board. Pattern matching technique, which is done using techniques that stores AOI system information for bad and good PCB assemblies to match the image obtained. Statistical pattern matching, which is similar to pattern matching, expect that it also uses a base method to address problems. By storing results of different boards and various failures, it can accommodate minor deviations, always acceptable, without flagging any errors . With improved technology, AOI systems are now known for its accuracy, giving least errors.

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