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A photoelastic fiber optic strain gageThis paper reports on the development of a photoelastic fiber optic strain gage sensitive to transverse strain. The sensing element is made from an epoxy resin which is stress frozen to passively achieve the quadrature condition. Light, emitted from an LED operating at 820 nm, is transmitted to and from the sensing element via multimode fibers and the signal is detected using a dual channel operational photodiode/amplifier. This unique combination of optics and electronics produces a fiber optic sensor having a high signal to noise ratio which is lead-in/out insensitive. Results show that strains on the order of 1 microstrain can be measured over an 800 microstrain range and that dummy gages can be used for temperature compensation.
Document ID
19940036325
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Su, Wei
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Gilbert, John A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Katsunis, Constantine
(Alabama Univ. Huntsville, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: International Congress on Experimental Mechanics, 7th, Las Vegas, NV, June 8-11, 1992, Proceedings. Vol. 2 (A94-12901 02-39)
Publisher: Society for Experimental Mechanics, Inc.
Subject Category
Instrumentation And Photography
Accession Number
94A12980
Distribution Limits
Public
Copyright
Other

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