Значение и использование
UV-A and Visible light sources are used to provide adequate light levels for liquid penetrant and magnetic particle examination. Light meters are used to verify that specified light levels are available.
Fluorescence is produced by irradiating the fluorescent dyes/pigments with UV-A radiation. The fluorescent dyes/pigments absorb the energy from the UV-A radiation and re-emit light energy in the visible spectrum. This energy transfer allows fluorescence to be observed by the human eye.
High Intensity UV-A light sources produce light intensity greater than 10,000 µW/cm2 at 38.1 cm (15 in.).
1.1 This guide describes the use of UV-A/Visiblelight sources and meters used for the examination of materials bythe liquid penetrant and magnetic particle processes. This guidemay be used to help support the needs for appropriate lightintensities and light measurement.
1.2 This guide also provides a reference:
1.2.1 To assist in the selection of light sourcesand meters that meet the applicable specifications orstandards.
1.2.2 For use in the preparation of internaldocumentation dealing with liquid penetrant or magnetic particleexamination of materials and parts.
1.3 The values stated in SI units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informationonly and are not considered standard
1.4 This standard does notpurport to address all of the safety concerns, if any, associatedwith its use. It is the responsibility of the user of this standardto establish appropriate safety and health practices and determinethe applicability of regulatory limitations prior touse.