NEW DEVELOPMENTS IN FAST 3D - SURFACE QUALITY CONTROL

J. Leopold, H. Günther

Abstract

Inspection is the process of determining if a product deviates from a given set of specifications. Fast Inspection usually involves measurement of specific part features such as assembly integrity, geometric dimensions and surface finish. It is a quality control task, but is distinguished from testing tasks. The visual inspection of 3D - parts (car body parts) is a special task within manufacturing that has been auto-mated at a comparatively slow pace up to this time. Different optical methods, applied for 3D - Measuring of microscopically and macroscopically sheet metal parts based on the Projected Fringes Method (PFM), the Electronic Speckle Interferometry (ESPI), the Structured-Lighting Reflection Technique (SLRT), White-Light-Interferometry (WLI) and also SEM-, AFM- and Laser Scanning methods (LSM) will be discussed. In addition, stylus instruments and also colorimeter measurements was included. The presentation is closed with advantages and disadvantages of different contemporary intelligent methods for car body inspections: Neural Net based Classification; Fractal Analysis and Wavelet Transformation.

Keywords

inspection; surface, optical methods, intelligent interpretation

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IMEKO-WC-2000-TC14-P381.pdf

DOI

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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