ASTM E903-96 - 1.1.1996
 
1. Scope

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. Except for transmitting sheet materials that are inhomogeneous, patterned, or corrugated, this test method is preferred over Test Method E1084.

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 and health practices and determine the applicability of regulatory limitations prior to use.

 
2. Referenced Documents

E1084-86(2023)

Standard Test Method for Solar Transmittance (Terrestrial) of Sheet Materials Using Sunlight

G173-23

Standard Tables for Reference Solar Spectral Irradiances: Direct Normal and Hemispherical on 37? Tilted Surface

E2554-18e1

Standard Practice for Estimating and Monitoring the Uncertainty of Test Results of a Test Method Using Control Chart Techniques (Includes all amendments and changes 10/7/2019).

G197-14(2021)

Standard Table for Reference Solar Spectral Distributions: Direct and Diffuse on 20? Tilted and Vertical Surfaces

NIST SP 250-69

Regular Spectral Transmittance Available on line at http://www.nist.gov/calibrations/upload/SP250-69.pdf

E1175-87(2022)

Standard Test Method for Determining Solar or Photopic Reflectance, Transmittance, and Absorptance of Materials Using a Large Diameter Integrating Sphere

E275-08(2022)

Standard Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers

E424-71(2023)

Standard Test Methods for Solar Energy Transmittance and Reflectance (Terrestrial) of Sheet Materials

E490-22

Standard Solar Constant and Zero Air Mass Solar Spectral Irradiance Tables

E772-15(2021)

Standard Terminology of Solar Energy Conversion

E971-11(2019)

Standard Practice for Calculation of Photometric Transmittance and Reflectance of Materials to Solar Radiation