Ultraviolet Light Induced Fade of Penetrant and Fluorescent Penetrant Indications

Journal Article · Mon Mar 06 00:00:00 EST 2006 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2184581· OSTI ID:20798261

Lopez, R D ^[1]

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1. Center for Nondestructive Evaluation, Iowa State University, Ames, Iowa 50011 (United States)

While industry standards don't currently address the issue, one must be aware of the possible consequences of using ultraviolet light sources many times higher than the minimum specified intensity for FPI work. High UVA intensity, coupled with elevated specimen temperature and increased air flow, will fade a defect indication to a pale blue in minutes. Experimental work has shown that it is possible to reduce the brightness of a 0.060'' long crack indication by half within 3.5 minutes with commonly used intensities. Elevating the penetrant's temperature or increasing the airflow caused UVA-illuminated fluorescent dye to fade more quickly.

• OSTI ID: 20798261
• Journal Information: AIP Conference Proceedings, Vol. 820, Issue 1; Conference: Conference on review of progress in quantitative nondestructive evaluation, Brunswick, ME (United States), 31 Jul - 5 Aug 2005; Other Information: DOI: 10.1063/1.2184581; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRACKS
DEFECTS
NONDESTRUCTIVE TESTING
PHYSICAL RADIATION EFFECTS
ULTRAVIOLET RADIATION