ASTM E903-20 Standard Test Method for Solar Absorptance, Reflectance, and Transmittance of Materials Using Integrating Spheres
ASTM E903-20 用积分球测定太阳吸收率、反射率和材料透射率的标准试验方法
1.1 本试验方法包括使用配有积分球的分光光度计测量材料的光谱吸收率、反射率和透射率。
1.2 规定了根据测量的光谱值计算太阳加权特性的方法。
1.3 本试验方法适用于具有镜面反射和漫反射的材料光学性能。
1.4 本试验方法为 适用于涂有光学涂层的材料，并特别考虑对被测材料纹理的影响。
1.5 不均匀、有纹理、有图案或有波纹的透射板材料需要特别考虑本试验方法的适用性。测试方法1084可能更适合于测定体光学性质对于纹理或不均匀材料。
1.6 对于均质材料，本试验方法优于试验方法1084。
1.7 本试验方法指使用标准参考太阳光谱分布的应用，但可以使用替代选择的光谱进行应用，只要太阳光谱分布的来源和细节以及报告加权。
1.8 本标准不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。
1.9 本国际标准是根据国际公认的标准化原则制定的 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。
1.1 This test method covers the measurement of spectral absorptance, reflectance, and transmittance of materials using spectrophotometers equipped with integrating spheres.
1.2 Methods of computing solar weighted properties from the measured spectral values are specified.
1.3 This test method is applicable to materials having both specular and diffuse optical properties.
1.4 This test method is applicable to material with applied optical coatings with special consideration for the impact on the textures of the material under test.
1.5 Transmitting sheet materials that are inhomogeneous, textured, patterned, or corrugated require special considerations with respect to the applicability of this test method. Test MethodE1084may be more appropriate to determine the bulk optical properties of textured or inhomogeneous materials.
1.6 For homogeneous materials this test method is preferred over Test MethodE1084.
1.7 This test method refers to applications using standard reference solar spectral distributions but may be applied using alternative selected spectra as long as the source and details of the solar spectral distribution and weighting are reported.
1.8 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.
1.9 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.
ASTM E1980及ASTM E903标准都关注于太阳反射率，睿督提供ASTM E1980太阳反及ASTM E903太阳反射比测试
ASTM E1980标准名称ASTM E1980 Standard Practice for Calculating Solar Reflectance Index of Horizontal and Low-Sloped Opaque Surfaces.
ASTM E1980 水平和低倾斜不传热表面太阳光反射系数的计算规程。
太阳能反射率和热辐射系数是影响地表和近地表环境空气温度的重要因素。太阳反射率低的地表吸收大部分进入的太阳能。吸收的能量的一部分被导入地面和建筑物，与大气对流（导致更高的气温），并且一部分辐射到天空。对于等效条件，表面的发射率越低，其稳态温度越高。
具有低发射率的表面不能有效地辐射到天空并因此变得热。确定太阳反射率和热发射率，并且随后计算相对于黑色和白色参考温度（定义为太阳能反射率指数，SRI），表面的温度可以帮助设计者和消费者选择合适的材料以使他们的建筑物和社区节能。