Infrared Wavelength Dependence of the Total Absorptivity of Electroplated Silver

David Cline

The total hemispherical absorptivity of electroplated silver at 75.8°K has been measured as a function of blackbody radiation temperatures from 268°K to 367°K. The measurements were made in a Dewar-like calorimeter. The total hemispherical absorptivity is found to increase with decreasing blackbody radiation temperature. Assuming a simple relationship between hemispherical absorptivity and normal absorptivity, the normal absorptivity increases with increasing mean wavelength. © 1962 The American Institute of Physics.

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Materials
Curve 1
Temperature, K: 298 Wavelength Range, μm: 0.80-2.00 Geometry θ' β': 45° 45° Composition (weight percent), Specifications, and Remarks: Platinum (~0.102 μm thick); fused quartz substrate; applied by brushing on a platinum solution and firing; tungsten filament source; measured relative to aluminum mirror; data beyond 2.2 μm subject to sizable errors. [Author's designation: Specimen 4A]
Curve 2
Temperature, K: 298 Wavelength Range, μm: 0.80-2.00 Geometry θ' β': 15° 15° Composition (weight percent), Specifications, and Remarks: Similar to curve 1 specimen and conditions. [Author's designation: Specimen No. 4A]
Curve 3
Temperature, K: 298 Wavelength Range, μm: 0.80-2.00 Geometry θ' β': 45° 45° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 4
Temperature, K: 298 Wavelength Range, μm: 0.80-2.00 Geometry θ' β': 15° 15° Composition (weight percent), Specifications, and Remarks: Similar to curve 1 specimen and conditions. [Author's designation: Specimen No. 5A]
Curve 5
Temperature, K: 298 Wavelength Range, μm: 0.80-2.00 Geometry θ' β': 45° 45° Composition (weight percent), Specifications, and Remarks: Similar to curve 1 specimen and conditions. [Author's designation: Specimen No. 5A]
Curve 6
Temperature, K: 298 Wavelength Range, μm: 0.80-2.00 Geometry θ' β': 15° 15° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.