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Proceedings Paper

Reflectance measurements on submillimeter absorbing coatings for HIFI
Author(s): Mari Carmen Diez; Tjeerd O. Klaassen; Kees Smorenburg; V. Kirschner; Klaas J. Wildeman
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Paper Abstract

Specular and diffuse reflectance (BRDF) of black absorbing coatings, meant to be used for the HIFI instrument aboard the FIRST satellite, has been studied in the sub-millimeter region (0.1 < (lambda) < 0.9 mm). These coatings have to meet space qualification requirements and must be usable for at least the overall wavelength band (0.1 - 0.6 mm) covered by the HIFI spectrometer. Existing materials, coatings obtained from other research groups and home made samples have been studied. Optical characterization of these coatings has been performed at wavelengths of 96.5 micrometers , 118.8 micrometers , 184.3 micrometers , 496 micrometers and 889 micrometers , for a large range of directions of incident and reflected light and for different polarization directions. A limited number of reflectance measurements at cryogenic temperatures have been carried out too. A simple experimental set up to study the effect of double scattering has been constructed to investigate the accuracy of numerical simulations based on experimental BRDF values. Data show that the best samples (home made) have BRDF values below about 2.10-2 Sr-1 throughout the wavelength range of interest, quite independent of directions of incidence, reflection and polarization. The Total Hemispherical Reflection of such a coating will then be 0.06.

Paper Details

Date Published: 27 March 2000
PDF: 11 pages
Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (27 March 2000); doi: 10.1117/12.393977
Show Author Affiliations
Mari Carmen Diez, Delft Univ. of Technology (Spain)
Tjeerd O. Klaassen, Delft Univ. of Technology (Netherlands)
Kees Smorenburg, TNO Institute of Applied Physics (Netherlands)
V. Kirschner, TNO Institute of Applied Physics (Netherlands)
Klaas J. Wildeman, Space Research Organization (Netherlands)

Published in SPIE Proceedings Vol. 4013:
UV, Optical, and IR Space Telescopes and Instruments
James B. Breckinridge; Peter Jakobsen, Editor(s)

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