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Optical Engineering

Active vibration control using a modal-domain fiber optic sensor
Author(s): David E. Cox
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Paper Abstract

A closed-loop control experiment is described in which vibrations of a cantilevered beam are suppressed using measurements from a modal-domain fiber optic sensor. Modal-domain sensors use interference between the modes of a few-mode optical waveguide to detect strain. The fiber is bonded along the length of the beam and provides a measurement related to the strain distribution on the surface of the beam. A model for the fiber optic sensor is derived, and this model is integrated with the dynamic model of the beam. A piezoelectric actuator is also bonded to the beam and used to provide control forces. Control forces are obtained through dynamic compensation ofthe signal from the fiber optic sensor. The compensator is implemented with a real-time digital controller. Analytical models are verified by comparing simulations to experimental results for both open-loop and closed-loop configurations.

Paper Details

Date Published: 1 January 1992
PDF: 5 pages
Opt. Eng. 31(1) doi: 10.1117/12.56054
Published in: Optical Engineering Volume 31, Issue 1
Show Author Affiliations
David E. Cox, NASA (United States)

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