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- Newsgroups: sci.space
- Path: sparky!uunet!paladin.american.edu!gatech!destroyer!cs.ubc.ca!fs1.ee.ubc.ca!davem
- From: davem@ee.ubc.ca (Dave Michelson)
- Subject: Re: Fiber optic umbilical
- Message-ID: <1993Jan5.004746.28555@ee.ubc.ca>
- Organization: University of BC, Electrical Engineering
- References: <37410aff@ofa123.fidonet.org>
- Date: Tue, 5 Jan 1993 00:47:46 GMT
- Lines: 30
-
- In article <37410aff@ofa123.fidonet.org> Mark.Perew@p201.f208.n103.z1.fidonet.org writes:
- >Putting a fiber optic umbilical on a remote sensing platform designed to
- >traverse rough terrain seems very odd to me. Can someone explain to me why
- >this was done? A few things come to mind such as eliminating the weight
- >required for a radio and associated power supply. Also the fiber optic does
- >allow for high reliability and high speed data transfer.
- >
- >I'm *not* throwing stones at the Dante folks. I'm just doing some head
- >scratching and hoping someone will explain this to me.
- >
-
- I don't know how Dante's umbilical is put together so I can't comment on that
- but...
-
- In the early 1980's, Northern Telecom pioneered the development of a helical
- sheath that greatly reduces the stress placed on an optical fibre due to either
- bending (bad!) or stretching (worse!). The helical sheath was developed in
- response to problems encountered when laying underground cables using
- a machine called a "ditch witch".
-
- I don't have any details handy but I'm sure someone else on the net can
- provide them.
-
- ---
- Dave Michelson
- davem@ee.ubc.ca
-
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