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5. Inspection of bare PWBs

There are several possibilities, appliances and algorithms when inspecting bare PWBs

optically. These are able to inspect the copper wire-patterns on a PWB surface with high

precision. Optical inspection gives rapid and reliable results regarding the quality of the

PWB. Electrical detection methods, (e.g. ICT, Flying Probes) are slower and more expen‐

sive. Bare PWB inspecting AOIs have a special name: Automatic Optical Test (AOT)

systems. There are several research and survey papers about this topic [31]-[43] and two

manufacturers now have AOT machines [44]-[49]. In Table I a comparison between these

appliances is shown.

Figure 1. The three main part of an AOI system

(a)

(b)

Figure 2. Example for: a) linear barcode b) DMC

Materials Science - Advanced Topics390

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D-MAX DMC-20SEC Manuale Utente Pagina 4