1.1 本指南介绍了通过液体渗透剂和磁粉工艺检查材料时使用的UV-A/可见光源和仪表。本指南可用于建立测量辐照度和照度水平的实践和程序。 1.2 本指南还可作为参考: 1.2.1 协助选择符合适用规范或标准的辐照度和照明源及仪表。 1.2.2 用于准备材料和零件的液体渗透或磁粉探伤内部文件。 1.3 单位- 以国际单位制表示的值应视为标准值。 括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 UV-A和可见光源用于为液体渗透剂和磁粉检测提供足够的照明水平。UV-A光源、UV-A辐射计、可见光源和照度光度计用于验证指定的观察条件。 5.2 荧光通常通过用UV-A辐射照射荧光染料/颜料而产生。荧光染料/颜料吸收UV-A辐射并在可见光谱中重新发射光能。该过程允许人眼观察荧光。 5.3 UV-A光源可发射400nm（4000 Å），这可能会降低荧光指示的可见性。 高强度UV-A光源可能导致紫外线褪色，导致荧光指示退化或消失。

1.1 This guide addresses the use of UV-A/Visible light sources and meters used for the examination of materials by the liquid penetrant and magnetic particle processes. This guide may be used to establish practices and procedures to measure irradiance and illuminance levels. 1.2 This guide also acts as a reference: 1.2.1 To assist in the selection of irradiance and illumination sources and meters that meet the applicable specifications or standards. 1.2.2 For use in the preparation of internal documentation dealing with liquid penetrant or magnetic particle examination of materials and parts. 1.3 Units— The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 UV-A and visible light sources are used to provide adequate illumination levels for liquid penetrant and magnetic particle examination. UV-A sources, UV-A radiometers, visible light sources, and illuminance photometers are used to verify specified viewing conditions. 5.2 Fluorescence is typically produced by irradiating the fluorescent dyes/pigments with UV-A radiation. The fluorescent dyes/pigments absorb the UV-A radiation and re-emit light energy in the visible spectrum. This process allows fluorescence to be observed by the human eye. 5.3 UV-A sources may emit visible light above 400 nm (4000 Å), which may reduce the visibility of fluorescent indications. High intensity UV-A sources may cause UV fade, causing fluorescent indications to degrade or disappear.