NASA NTRS · 19900000131
Filter Enhances Fluorescent-Penetrant-Inspecting Borescope
Abstract
Slip-on eyepiece for commercial ultraviolet-light borescope reduces both amount of short-wave ultraviolet light that reaches viewer's eye and apparent intensity of unwanted reflections of white light from surfaces undergoing inspection. Fits on stock eyepiece of borescope, which illuminates surface inspected with intense ultraviolet light. Surface, which is treated with fluorescent dye, emits bright-green visible light wherever dye penetrates - in cracks and voids. Eyepiece contains deep-yellow Wratten 15 (G) filter, which attenuates unwanted light strongly but passes yellow-green fluorescence so defects seen clearly.
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Molina, Orlando G.. 1990-03-01. Filter Enhances Fluorescent-Penetrant-Inspecting Borescope. https://ntrs.nasa.gov/citations/19900000131
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