20 September 2000 Aeroglaze Z306 black paint for cryogenic telescope use: outgassing and water vapor regain
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Abstract
This paper presents the results of an experimental investigation of Aeroglaze Z306 black paint used as a functional coating in a cryogenic telescope for the Space Based Infrared System (SBIRS) program. During ground testing of a DBIRS infrared sensor engineering test model (ETM), degradation of optical transmission was observed. Analysis showed that the degradation was caused by water vapor condensing onto sensor collection optics, which were operating at 120 to 130 K. Root cause analysis identified Aeroglaze Z306 black pain as a likely candidate source of the water vapor. Prior to ETM testing, the painted telescope housing was vacuum baked for 100 hours at 100 $DEGC. However ASTM E 595 test data show that significant water vapor regain occurs within 24 hours after vacuum bake-out. To obtain a detailed characterization of the black paint with respect to water vapor regain and subsequent removal under vacuum conditions, a test plan was developed involving a series of ASTM E 1559 test measurements. These tests improve our understanding of the processes involved and provide the basis for design of an on-orbit H2 bakeout capability for the SBIRS infrared sensor payload.
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Doug M. McCroskey, George C. Abell, Mike H. Chidester, "Aeroglaze Z306 black paint for cryogenic telescope use: outgassing and water vapor regain", Proc. SPIE 4096, Optical Systems Contamination and Degradation II: Effects, Measurements, and Control, (20 September 2000); doi: 10.1117/12.400824; https://doi.org/10.1117/12.400824
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