1.1 本规程涵盖了用于荧光渗透剂和荧光磁粉检测的紫外线A（UV-A）、发光二极管（LED）灯的性能测试程序（见指南 E709 和 E2297年 ，和实践 E165/E165M , E1208 , E1209 , E1210 , E1219 , E1417/E1417M 和 E1444 ). 2. 本规范还包括UV-A LED灯的报告和性能要求。 1.2 这些测试仅由制造商进行，以证明特定灯具型号（外壳、滤波器、二极管、电子电路设计、光学元件、冷却系统和电源组合）的性能，还包括交付给用户的单个灯具的有限验收测试。 本测试程序不适用于最终用户。 1.3 本规程仅适用于检查过程中使用的UV-A LED灯。本规程不适用于汞蒸气、气体放电、电弧或发光（荧光）灯或导光器（例如，内视镜光源）。 1.4 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 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、健康和环境实践，并确定监管限制的适用性。 1.6 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《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 UV-A灯用于荧光渗透剂和磁粉检测过程，以激发荧光团（染料或颜料），最大限度地提高对比度和检测不连续性。 荧光染料/颜料吸收UV-A辐射的能量，并在恢复到基态时重新发射可见光。这种激发能量转换允许人眼观察荧光。 4.2 UV-A灯的发射光谱会极大地影响染料/颜料荧光激发的效率。 4.3 一些高强度UV-A灯可以产生大于10000μW/cm的辐照度 2. 15英寸。（381毫米）。所有高强度UV-A光源都会导致荧光染料褪色，并增加检查员未受保护的眼睛和皮肤暴露在高水平的有害辐射下。 4.4 如果过滤不当，UV-A灯可能会发出不需要的可见光和有害的紫外线辐射。400 nm以上的可见光污染可能会干扰检查过程，必须加以控制，以尽量减少反射眩光，并最大限度地提高指示对比度。还必须消除UV-B和UV-C污染，以防止接触有害辐射。 4.5 不允许UV-A LED电路的脉宽调制（PWM）和脉冲放电（PF）。 注1: 现有UV-A辐射计和光谱辐射计准确测量脉宽调制或脉冲点火LED辐照度的能力以及脉冲点火对指示检测能力的影响尚不清楚。

1.1 This practice covers the procedures for testing the performance of ultraviolet A (UV-A), light emitting diode (LED) lamps used in fluorescent penetrant and fluorescent magnetic particle testing (see Guides E709 and E2297 , and Practices E165/E165M , E1208 , E1209 , E1210 , E1219 , E1417/E1417M and E1444 ). 2 This specification also includes reporting and performance requirements for UV-A LED lamps. 1.2 These tests are intended to be performed only by the manufacturer to certify performance of specific lamp models (housing, filter, diodes, electronic circuit design, optical elements, cooling system, and power supply combination) and also includes limited acceptance tests for individual lamps delivered to the user. This test procedure is not intended to be utilized by the end user. 1.3 This practice is only applicable for UV-A LED lamps used in the examination process. This practice is not applicable to mercury vapor, gas-discharge, arc or luminescent (fluorescent) lamps or light guides (for example, borescope light sources). 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 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 ====== 4.1 UV-A lamps are used in fluorescent penetrant and magnetic particle examination processes to excite fluorophores (dyes or pigments) to maximize the contrast and detection of discontinuities. The fluorescent dyes/pigments absorb energy from the UV-A radiation and re-emit visible light when reverting to its ground state. This excitation energy conversion allows fluorescence to be observed by the human eye. 4.2 The emitted spectra of UV-A lamps can greatly affect the efficiency of dye/pigment fluorescent excitation. 4.3 Some high-intensity UV-A lamps can produce irradiance greater than 10 000 μW/cm 2 at 15 in. (381 mm). All high-intensity UV-A light sources can cause fluorescent dye fade and increase exposure of the inspector’s unprotected eyes and skin to high levels of damaging radiation. 4.4 UV-A lamps can emit unwanted visible light and harmful UV radiation if not properly filtered. Visible light contamination above 400 nm can interfere with the inspection process and must be controlled to minimize reflected glare and maximize the contrast of the indication. UV-B and UV-C contamination must also be eliminated to prevent exposure to harmful radiation. 4.5 Pulse Width Modulation (PWM) and Pulse Firing (PF) of UV-A LED circuits are not permitted. Note 1: The ability of existing UV-A radiometers and spectroradiometers to accurately measure the irradiance of pulse width modulated or pulsed fired LEDs and the effect of pulsed firing on indication detectability is not well understood.