Illumination arrangement for use with a fluorescent non- destructive surface crack detection method, whereby a monochromatic light source and a suitable wavelength observation filter are used to improve detection sensitivity

摘要

Illumination device for surface crack detection has a monochromatic or nearly monochromatic light source for illumination of a workpiece. The workpiece is observed through a filter that blocks out the wavelength of the illumination light and is transparent to light of wavelength corresponding to that of the fluorescing workpiece surface.