1.1 本试验方法涵盖了适用于测量透明零件（包括大、厚、弯曲或已安装的零件）NVG加权透射率的仪器和程序。本试验方法对透射率随波长变化的透明度敏感。 1.2 由于透射率（或透射系数）是两个辐射值的比值，因此它没有单位。本试验方法中间步骤中记录的辐射单位不重要；任何公认的辐射单位（例如，瓦/米 2. -只要一致，可以使用str）。 2. 1.3 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。 1.4 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====== 5.1 重要性- 该测试方法提供了一种测量给定透明度兼容性的方法，通过该透明度，NVG在夜间用于观看室外夜间环境照明的自然场景。 5.2 使用- 本试验方法可用于任何透明零件，包括试样。它主要用于可能已经安装的大型、弯曲或厚零件（例如，飞机上的挡风玻璃）。

1.1 This test method covers apparatuses and procedures that are suitable for measuring the NVG-weighted transmissivity of transparent parts including those that are large, thick, curved, or already installed. This test method is sensitive to transparencies that vary in transmissivity as a function of wavelength. 1.2 Since the transmissivity (or transmission coefficient) is a ratio of two radiance values, it has no units. The units of radiance recorded in the intermediate steps of this test method are not critical; any recognized units of radiance (for example, watts/m 2 -str) may be used, as long as it is consistent. 2 1.3 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. 1.4 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 Significance— This test method provides a means to measure the compatibility of a given transparency through which NVGs are used at night to view outside, nighttime ambient illuminated natural scenes. 5.2 Use— This test method may be used on any transparent part, including sample coupons. It is primarily intended for use on large, curved, or thick parts that may already be installed (for example, windscreens on aircraft).