Defect Detection On The Internal Surfaces Of Hydraulics Cylinders For Motor Vehicles

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Abstract
An earlier article described a laser flying spot scanner for investigating the surface finish on the bores of components such as the hydraulics cylinders used in motor vehicle braking systems. The quality of finish on their internal surfaces must be very high; even small scratches or blow holes may lead to failure of the braking system, with dangerous consequences. The previous paper outlined a method for processing the signal from the photodetector, so that such defects may be identified. However, difficulties were experienced with this method of signal processing, which proved to be unduly sensitive to low frequency variations in the observed intensity of light reflected from the bore. Improved signal processing was therefore required. In this article, we describe the results of an experimental investigation using an interactive image analyser. It has been possible to demonstrate, by incremental simulation, that scratches can reliably be detected using an algorithm based upon a procedure which seeks and removes intensity anomalies.© (1979) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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