Physics – Optics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apopt..42.3970n&link_type=abstract
Applied Optics, Volume 42, Issue 19, pp. 3970-3980 (2003).
Physics
Optics
2
Optical Filters, Proton Effects, Cosmic Ray Protons, Astronomical Telescopes, Optical Glass, Light Transmission, Visible Spectra, Infrared Spectra, Ultraviolet Spectra
Scientific paper
The Optical, Spectroscopic, and Infrared Remote Imaging System (OSIRIS) instrument on board the Rosetta spacecraft, a mission of the European Space Agency to comet P/Wirtanen, includes two cameras for acquiring images of the comet. A set of interference filters deposited upon glass and fused-silica substrates will be added to the cameras for wavelength tuning. For this mission of more than 10/years in an interplanetary environment, the requirement of preserving the optical characteristics of the filters is a critical one. We checked the variation in the transmission of some filter substrates after proton irradiation that simulated the solar wind. To produce a situation that is representative of the interplanetary environment, we irradiated proton fluences at three energies: 1.5 × 1011 protons/cm2 at 4 MeV, 1.9 × 1010 protons/cm2 at 8 MeV, and 7.1 × 109 protons/cm2 at 18 MeV. Seven substrates were tested: three Suprasil-1 three colored glasses, namely, OG590, KG3, and RG9; and one quartz. In addition, two interference filters were checked. The results obtained show that Suprasil-1 is rather insensitive to this irradiation, whereas very small reductions in transmission, of the order of a few percent, occur for colored glasses. The transmission of these filters was remeasured 2 years after the irradiation, and showed a general decrease in the transmission reduction.
Boscolo Alessio
Naletto Giampiero
Quaranta Alberto
Wyss Jeffery
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