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Optical Engineering

Detection of high- and low-frequency vibrations using a feedback-stabilized differential fiber optic interferometer
Author(s): Mehdi Vaez-Iravani; M. Nonnenmacher; H. Kumar Wickramasinghe
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Paper Abstract

Highly sensitive and stable detection of minute ac and pseudo-dc (i.e. , very low frequency) vibrations is performed by means of a differential fiber optic Michelson interferometer. Any residual instabilities are eliminated by means of an ac feedback control loop. The stabilization technique is not affected by the variations in the reflectivity of the sample and by launch inefficiencies into the fiber. This approach also provides a simple, quantitative method for calibrating sample vibrations. Results are presented on the operation of the system in stabilizing its output as well as on the detection of the vibration of a silicon sample.

Paper Details

Date Published: 1 August 1993
PDF: 4 pages
Opt. Eng. 32(8) doi: 10.1117/12.143338
Published in: Optical Engineering Volume 32, Issue 8
Show Author Affiliations
Mehdi Vaez-Iravani, Rochester Institute of Technology (United States)
M. Nonnenmacher, IBM Deutschland GmbH (Germany)
H. Kumar Wickramasinghe, IBM Corp. (United States)

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