Small features such as bevels and edge profiles are a common and often critical feature on many manufactured parts. In the past, the only ways to measure such features was to make a wax mold of the feature and slice it for measurement on an optical comparator, or to do a slow mechanical tracing with a stylus or CMM type measurement system. This paper describes the application of machine vision tools, using controlled lighting to highlight shape information such as curvature, combined with 2D vision processing to extract the 3D shape based upon surface modeling.
The inspection of plastic film flatness is approached by utilizing the light specular reflection off the film. A grating image formed by the reflection provides the slope information of the film surface. The wedge test shows the specular reflection-based flatness tester can achieve the slope accuracy of 0.01°. The film test shows the capability of the tester on the surface with a variety of slopes resulting in RMS and PV values of the slope. The film appearance in
terms of the amount of interference rings is correlated to the RMS value of slope derivative.
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