Feasibility Study of an Automatic Photoelectric Detection System for Inspection of 'Magnafluxed' M46Steel Bodies.

摘要

The objective of the program was to automate and speed up the existing 'magna-glow'detection by replacing the human observer with a high speed photosensor system. Fundamentally,each item is presented to the inspection device in some manner after having been routinely magna-glowed. An optical system collects the light from the item,rejects the ultraviolet components,and a photodetector recognizes the characteristic yellow phosphor adhering to the cracks and surface discontinuities. By expanding the signal to background ratio,optimizing the field of view and using pulse discriminating electronics it was possible to correlate the photocells output signal with the magnitude of the surface discontinuity. (Modified author abstract)