1.1 本试验方法包括使用日射强度计、外壳和太阳作为能源，测量片状材料的太阳透射率（地面）。 1.2 该测试方法还允许在非法向入射的角度下测量太阳透射率。 1.3 本试验方法适用于透明、半透明、有纹理或有图案的片材。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 4.1 太阳透过率是通过开窗、收集器玻璃和保护封套吸收能量的一个重要因素。该测试方法提供了一种在固定条件下测量该系数的方法。虽然这些数据可能有助于设计者选择和规范玻璃材料，但在没有其他重要因素信息的情况下，太阳透射率不足以定义净传热率。 4.2 该测试方法已被发现适用于透明和半透明材料，以及那些因高反射涂层而降低透射率的材料。该测试方法特别适用于测量不均匀、纤维增强、图案化或波纹材料的透射率，因为透射率是在大面积上平均的。 4.3 该试验方法可用于测量玻璃材料在偏离法向入射60°的角度下的透射率。 注1: 一种与所描述的技术类似但使用日射计的技术已被用于测量镜面太阳反射率；然而，目前在这项技术的标准化方面还没有足够的经验。

1.1 This test method covers the measurement of solar transmittance (terrestrial) of materials in sheet form by using a pyranometer, an enclosure, and the sun as the energy source. 1.2 This test method also allows measurement of solar transmittance at angles other than normal incidence. 1.3 This test method is applicable to sheet materials that are transparent, translucent, textured, or patterned. 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 ====== 4.1 Solar transmittance is an important factor in the admission of energy through fenestration, collector glazing, and protective envelopes. This test method provides a means of measuring this factor under fixed conditions. While the data may be of assistance to designers in the selection and specification of glazing materials, the solar transmittance is not sufficient to define the rate of net heat transfer without information on other important factors. 4.2 This test method has been found practical for both transparent and translucent materials, as well as for those with transmittance reduced by highly reflective coatings. This test method is particularly applicable to the measurement of transmittance of inhomogeneous, fiber reinforced, patterned, or corrugated materials since the transmittance is averaged over a large area. 4.3 This test method may be used to measure transmittance of glazing materials at angles up to 60° off normal incidence. Note 1: A technique similar to the one described but using a pyrheliometer has been used for the measurement of specular solar reflectance; however, there is insufficient experience with this technique for standardization at present.