1.1 这些测试方法包括测量片状材料的太阳能透射率和反射率（地面）。方法A使用分光光度计，适用于透射率和反射率，是判定方法。方法B仅适用于使用外壳中的日射强度计和太阳作为能源来测量透射率。方法A的样品尺寸受到分光光度计几何形状的限制，而方法B需要0.61m的样品 2. （2英尺 2. ). 对于起草工作组研究的材料，两种测试方法给出的结果基本相同。 1.2 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。 1.3 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====== 5.1 太阳能的透射率和反射率是通过开窗进入热量的重要因素，最常见的是通过玻璃或塑料。（参见 附录X3 这些方法提供了在固定的入射和观看条件下测量这些因素的方法。虽然这些数据可能有助于设计者选择和规范玻璃材料，但如果没有其他重要因素的信息，太阳能的透射率和反射率不足以定义传热率。 已经发现这些方法对于透明和半透明材料以及那些通过高反射涂层降低透射率的材料都是实用的。方法B特别适用于测量不均匀、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。

1.1 These test methods cover the measurement of solar energy transmittance and reflectance (terrestrial) of materials in sheet form. Method A, using a spectrophotometer, is applicable for both transmittance and reflectance and is the referee method. Method B is applicable only for measurement of transmittance using a pyranometer in an enclosure and the sun as the energy source. Specimens for Method A are limited in size by the geometry of the spectrophotometer while Method B requires a specimen 0.61 m 2 (2 ft 2 ). For the materials studied by the drafting task group, both test methods give essentially equivalent results. 1.2 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. 1.3 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 Solar-energy transmittance and reflectance are important factors in the heat admission through fenestration, most commonly through glass or plastics. (See Appendix X3 .) These methods provide a means of measuring these factors under fixed conditions of incidence and viewing. While the data may be of assistance to designers in the selection and specification of glazing materials, the solar-energy transmittance and reflectance are not sufficient to define the rate of heat transfer without information on other important factors. The methods have been found practical for both transparent and translucent materials as well as for those with transmittances reduced by highly reflective coatings. Method B is particularly suitable for the measurement of transmittance of inhomogeneous, patterned, or corrugated materials since the transmittance is averaged over a large area.