Fiber-optic extensometer
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United States of America Patent
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Apr 23, 2013
Grant Date -
Feb 24, 2011
app pub date -
Aug 12, 2010
filing date -
Aug 20, 2009
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Abstract
An extensometer having a loop of a single-mode optical fiber. At least two points of the loop are attached to desired locations on a specimen. Light is transmitted through the loop and the transmitted optical power is measured by a photodetector. The deformation of the specimen causes the size and shape of the loop to change, which changes the transmitted optical power. The change in optical power is related to extension or compression using calibration curves. The sensor works on the principle of transmitted power modulation through the curved section.
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