Reflectance measurements on submillimeter absorbing coatings for HIFI

Mari Carmen Diez; Tjeerd O. Klaassen; Kees Smorenburg; V. Kirschner; Klaas J. Wildeman

doi:10.1117/12.393977

27 March 2000 Reflectance measurements on submillimeter absorbing coatings for HIFI

Mari Carmen Diez, Tjeerd O. Klaassen, Kees Smorenburg, V. Kirschner, Klaas J. Wildeman

Proceedings Volume 4013, UV, Optical, and IR Space Telescopes and Instruments; (2000) https://doi.org/10.1117/12.393977
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

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.

Citation Download Citation

Mari Carmen Diez, Tjeerd O. Klaassen, Kees Smorenburg, V. Kirschner, and Klaas J. Wildeman "Reflectance measurements on submillimeter absorbing coatings for HIFI", Proc. SPIE 4013, UV, Optical, and IR Space Telescopes and Instruments, (27 March 2000); https://doi.org/10.1117/12.393977

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