ASTM C1549 Standard Test Method for Determining Near Ambient Solar Reflection Using a Portable Solar Reflectometer

This standard covers a technique for determining the solar reflectance of flat opaque materials in a laboratory or field using a commercial portable solar reflectometer. The purpose of the test method is to provide the solar reflection data needed to evaluate temperatures and heat fluxes across surfaces exposed to solar radiation.

This standard does not replace Test Method E250, which measures solar reflectance in the 2500 to 903 nm wavelength range using integrated spheres. The portable solar reflectometer is calibrated using known solar reflectance samples to determine solar reflectance from measurements at four wavelengths in the solar spectrum.

This technique is supported by comparing reflectometer measurements with measurements obtained using test method E903. This test method is applicable to material samples with both specular and diffuse optical properties. It is particularly suitable for the measurement of solar reflectance of opaque materials.

Values ​​stated in SI units should be accepted as standard. No other units of measurement are included in this standard.

This standard does not purport to address all, if any, safety concerns associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory restrictions prior to use.

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