1.1本试验方法涵盖用窄带光源照明时荧光涂层或薄片样品亮度比的仪器测量。 1.2本试验方法通常适用于具有荧光和反射特性的任何涂层或挡板材料，其中荧光被405 nm光激活。 1.3本试验方法旨在作为规范的补充 E2501 支持工业涂料的开发和规范，当按照规范进行检查时，用于检测涂层缺陷的系统 E2501 光源。本试验方法建立了涂层光学性能的定量测量方法，该测量方法与其在指定检查光源下增强缺陷对比度的能力相关。 1.4以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 ====意义和用途====== 5.1本试验方法适用于根据规范检查缺陷的荧光和非荧光涂层的开发、规范和质量控制试验 E2501 照明

1.1 This test method covers the instrumental measurement of the luminance ratio of a fluorescent coating or sheet sample when illuminated by a narrow band source. 1.2 This test method is generally applicable to any coating or sheeting material having combined fluorescent and reflective properties, where the fluorescence is activated by 405 nm light. 1.3 This test method is intended as a companion to Specification E2501 to support the development and specification of industrial coatings that are used in a system for detection of coating defects when inspected with the Specification E2501 light source. This test method establishes a quantitative measure of the optical property of a coating that correlates to its ability to enhance defect contrast under the specified inspection light source. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 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 and health practices and determine the applicability of regulatory limitations prior to use. ====== Significance And Use ====== 5.1 The test method is suitable for the development, specification and quality control testing of fluorescent and non-fluorescent coatings that are intended to be inspected for defects under Specification E2501 illumination.