Far-Infrared Reflectance Spectra Of Optical Black Coatings

Sheldon M. Smith

doi:10.1117/12.934133

5 April 1983 Far-Infrared Reflectance Spectra Of Optical Black Coatings

Sheldon M. Smith

Proceedings Volume 0362, Scattering in Optical Materials II; (1983) https://doi.org/10.1117/12.934133
Event: 26th Annual Technical Symposium, 1982, San Diego, United States

Abstract

Far-infrared specular reflectance spectra of six optically black coatings near normal incidence are presented. The spectra were obtained using nine bandpass transmission filters in the wavelength range between 12 and 300 μm. Data on the construction, thickness, and rms surface roughness of the coatings are also presented. The chemical composition of two coatings can be distinguished from that of the others by a strong absorption feature between 20 and 40 μm which is attributed to amorphous silicate material. Inverse relationships between these spectra and coating roughness and thickness are noted and lead to development of a reflecting-layer model for the measured reflectance. The model is applied to the spectra of several coatings whose construction falls within its constraints.

Citation Download Citation

Sheldon M. Smith "Far-Infrared Reflectance Spectra Of Optical Black Coatings", Proc. SPIE 0362, Scattering in Optical Materials II, (5 April 1983); https://doi.org/10.1117/12.934133

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