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