Detection of Defects in Printed Circuit Boards Using Fuzzy Logic and Correlation Coefficient
A Printed Circuit Board (PCB) is a card made specifically for attaching electronic components on it. Inspection of PCB is necessary in order to reduce the defects otherwise it can lead to complete circuit failures. In this paper, the authors have presented a PCB inspection system which involves the use of correlation coefficient and fuzzy logic in order to detect the defects and the inspection system is applied at the time of manufacturing, i.e., the making of bare PCB. The inspection system also gives the degree of defectiveness present in the PCB. Typical defects that can be detected are over etchings (opens), under-etchings (shorts), holes etc.
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