Optics: measuring and testing – Of light reflection – With diffusion
Patent
1983-01-18
1985-04-23
McGraw, Vincent P.
Optics: measuring and testing
Of light reflection
With diffusion
250563, 356237, 356241, G01N 2188
Patent
active
045126631
ABSTRACT:
Defects in a machined surface are detected by sensing excursions in a test signal generated by means of a conventional scanning system (1), which includes a detector responsive to light reflected and/or scattered from an illuminated spot scanned over the surface. The test signal is applied to a comparator (6), together with a signal representative of an appropriate threshold level for sensing the excursions. This level is ascertained, in accordance with a specific formula, by means of an analysis system (5) to which is applied a preliminary signal derived in a similar manner to the test signal from the surface to be inspected.
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Professor P. A. McKeown et al., The Application of Optics to the Quality Control of Automotive Components, Cranfield Institute of Technology, U.K., SPIE (Society of Photo-Optical Instrumentation Engineers), vol. 60, 1975, pp. 77 to 84.
W. Bailey, Optical Inspection of Cylinder Bores, Cranfield Institute of Technology, Tribology International, Dec. 1977, vol. 10, No. 6, pp. 319 to 321.
McGraw Vincent P.
National Research Development Corporation
Turner S. A.
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