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Proceedings Paper

Resonance energy transfer in a novel two-component system: two-photon fluorophore and a photo-chromic acceptor molecule
Author(s): Raz Gvishi; Zvi Kotler; Garry Berkovic; Pnina Krief; Mark Sigalov; Lev Shapiro; Dan Huppert; Vladimir Khodorkovsky; V. Lokshin; A. Samat
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Paper Abstract

To date, a full-scale solar sail has never flown in space. Furthermore, solar sail technology development represents a field that only recently has enjoyed significant support. The goal of this work is to contribute to the development of a low-mass ODS for solar sails that would include research and development in the areas of photogrammetry and thermography. The focus of this work was on the development of the thermography system. A measurement protocol was designed for obtaining accurate temperature measurements using thermal imaging when heat was applied to the membrane surface. Two main limitations were considered during the experimental process. The first is that conventional infrared detector arrays must be kept cool. To minimize the effect that an imager's operating temperature would have on the ODS, a miniature, un-cooled microbolometer was used to acquire temperature measurements from the membrane surface. A second limitation is that a detector array cannot distinguish between emitted and reflected photons, thus presenting a significant problem if one cannot predict the reflected component or if the reflected component is significantly greater than the emitted. To address this limitation, spectral properties of the membrane, including reflectance and transmission, were analyzed using a Hemispherical Directional Reflectometer (HDR) to predict the effects that optical properties would have on sail membrane temperatures. A thermal modeling strategy was also developed. The results of this investigation are presented.

Paper Details

Date Published: 4 April 2005
PDF: 8 pages
Proc. SPIE 5724, Organic Photonic Materials and Devices VII, (4 April 2005); doi: 10.1117/12.588695
Show Author Affiliations
Raz Gvishi, Soreq Nuclear Research Ctr. (Israel)
Zvi Kotler, Soreq Nuclear Research Ctr. (Israel)
Garry Berkovic, Soreq Nuclear Research Ctr. (Israel)
Pnina Krief, Ben-Gurion Univ. of the Negev (Israel)
Mark Sigalov, Ben-Gurion Univ. of the Negev (Israel)
Lev Shapiro, Ben-Gurion Univ. of the Negev (Israel)
Dan Huppert, Tel Aviv Univ. (Israel)
Vladimir Khodorkovsky, Ben-Gurion Univ. of the Negev (Israel)
Univ. De la Mediterrenee, CNRS (France)
V. Lokshin, Univ. de la Mediterrenee, CNRS (France)
A. Samat, Univ. de la Mediterrenee, CNRS (France)


Published in SPIE Proceedings Vol. 5724:
Organic Photonic Materials and Devices VII
James G. Grote; Toshikuni Kaino; Francois Kajzar, Editor(s)

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