PSN-L Email List Message

Subject: Re: fiber optic strainmeters
From: barry lotz gbl@.......
Date: Wed, 27 Dec 2000 08:27:15 -0800

    I had a couple of questions.  I was wondering how the cable would be
supported ( or not)  ? Would there be friction between the conduit and cable due
to bends in the cable or gravity? I know in prestressed concrete there are
pretty sizable losses in tension due to friction, though I realize the magnitude
of forces are considerable different.. I'm not familiar with how the longer
length cables are suspended or supported. It would seem that even short
suspended cables would have a  catanary (spelling?) shape which would change
with distance between supports and thus  the cable might not stretch the same
amount as the ground moves. I guess could be calibrated and the strains
corrected. I am also very interested in your progress and findings.


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Larry Cochrane <cochrane@..............>