Microscopic cracks or flaws in surface of a workpiece are often detected with fluorescent dye. Dye is spread over surface to be inspected and then washed off. When piece is viewed under ultraviolet light, a glow is seen from dye trapped in any flaws. Intensity of fluorescence gives a rough indication of depth of defect. Fluorescent inspection procedure is fast, inexpensive and simple to perform.
Detecting Cracks on Inner Surfaces
NASA Tech Briefs ; 6 , 1
1982-09-01
Miscellaneous
No indication
English
Detecting Cracks in Rough Metal Surfaces
NTRS | 1985
|Automatic Identification of Cracks in Road Surfaces
British Library Conference Proceedings | 1999
|