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Fiber-optic flexural disk accelerometer

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Author
Olcott, Joanne E.
Date
1991-09
Advisor
Brown, David A.
Garrett, Steven L.
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Abstract
The fabrication and calibration of a fiber-optic flexural disk accelerometer is discussed in this thesis. The accelerometer is comprised of a cylindrical body with thin, flexible end plates (or disks) and an interior spindle coupling the disks together ensuring proper phasing. The sensing mechanism is comprised of single mode optical fiber wound into flat coils and epoxied on to the inside faces of the disks, forming the legs of a Michelson interferometer. The use of both legs of this fiber-optic interferometer as sensing elements provides a "push-pull" enhancement and effectively doubles the accelerometer's response while providing common-mode rejection of pressure and temperature variations. The acceleration sensitivity for a sensor consisting of two 1.8" by 1/25" disks is delta0/a(6) = 49 radians/g with a resonance frequency of 2450 Hz. the fractional phase change per unit force is delta0/0ma(c) = 5.5 x 10(-6) N(-1).
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.
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http://hdl.handle.net/10945/26545
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  • 1. Thesis and Dissertation Collection, all items

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