The measurements of absorptivity and reflectivity

E. T. DE LA Perrelle, T. S. Moss, H. Herbert

To deduce the absorptivity from a measurement of reflectivity it is necessary to measure the reflectivity in such a manner that both diffuse and specular reflection are correctly included. A method of doing this is described which makes use of a modified integrating sphere. Results have been obtained for a variety of materials for wavelengths from 0.33μ to 2.3 μ. © 1963.

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Materials
Curve 1
Temperature K: 298 Wavelength Range, µm: 0.4-2.2 Geometry θ θ' ω': ~0° 2π Composition (weight percent), Specifications, and Remarks: Authors' designation: Specimen X 81.
Curve 1
Temperature, K: 298 Wavelength Range, µm: 0.4-2.1 Geometry θ'ω': 0° 2π Composition (weight percent), Specifications, and Remarks: BARIUM TUNGSTATE, BaWO₄; converted from R(2π, 0°); [Authors' designation: Sample No. X 53].
Curve 2
Temperature, K: 298 Wavelength Range, µm: 0.4-2.1 Geometry θ'ω': 0° 2π Composition (weight percent), Specifications, and Remarks: LEAD TUNGSTATE, PbWO₄; converted from R(2π, 0°); [Authors' designation: Sample No. Y 11].
Curve 1
Temperature K: 298 Wavelength Range, μm: 0.40-2.2 Geometry θ' θ'': ~0°-0° Composition (weight percent), Specifications, and Remarks: Converted from R (2π, ~0°); [Authors' designation: Specimen X16].