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NASA Technical Reports Server (NTRS) 19980218118: Fiber Optic Cable...
by NASA Technical Reports Server (NTRS)
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A novel fiberoptic hermetic bulkhead feedthrough has been
developed which will offer cryogenic sealing at leak
rates of 10(exp -11) cc/sec helium. This feedthrough was
developed for NASA in response to needs for a
hermetically sealed feedthrough which could withstand a
range of temperatures from low cryogenic (-196 C), due to
liquid fuels and oxidizers, to high temperatures (+200 C)
encountered in the proximity of combustion gasses. The
development effort will be reported from conceptual
design of single and multi-channel feedthrough units with
single interconnection interfaces to units with double-
ended interconnection interfaces. Various combinations of
fiber/buffers are reported with recommendations based on
test results. A comprehensive series of environmental and
mechanical tests were performed to evaluate the
feedthroughs in adverse conditions. Test results are
reported including insertion loss, salt spray, sinusoidal
vibration, random vibration, mechanical shock, thermal
shock and humidity. A second set of feedthrough units was
exposed to 3 different types of radiation. Optical
transmittance changes during the tests were monitored and
leak rate testing was done after each test. State-of-the-
art technology in optical fiber feedthroughs constructed
with polycrystalline ceramic is presented.
Date Published: 2016-10-15 06:04:18
Identifier: NASA_NTRS_Archive_19980218118
Item Size: 359420996
Language: english
Media Type: texts
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