In-flight and post-flight stray radiation measurements on the Infrared Background Signature Survey (IBSS) telescope

Details In-flight and post-flight stray radiation measurements on the Infrared Background Signature Survey (IBSS) telescope In-flight and post-flight stray radiation measurements on the Infrared Background Signature Survey (IBSS) telescope

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2260..128b&link_type=abstract

Proc. SPIE Vol. 2260, p. 128-139, Stray Radiation in Optical Systems III, Robert P. Breault; Ed.

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The Infrared Background Signature Survey (IBSS) Satellite was launched in 1991 aboard the Space Shuttle Discovery. At the end of this mission an on-orbit straylight experiment was performed to verify the off-axis rejection performance of the IBSS IR telescope. After this experiment the sensor was pointed into flight direction (RAM) for about 1 hour to study contamination effects. Back on earth the telescope was disassembled from the cryostat and the straylight performance was measured once again. Test results showed a surprisingly slight increase in the telescope point source transmittance (PST) compared to pre-flight measurements. This degradation mainly was caused by enhanced scattering from the scanning mirror in front of the telescope. For verification the scan mirror was removed and the bidirectional reflectance distribution function (BRDF) of the contaminated mirror surface was measured directly and compared to pre-flight measurements on the clean mirror surface. The BRDF shows a local degradation by a factor of up to 12 caused by micro-meteorite impacts. On the scan mirror surface some molecular contamination was found. Measurements show that the loss of IR reflectance in the 7 to 15 micrometers wavelength band is below 1%.

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