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Proceedings Paper

Monitoring and multiplexing fiber Fabry-Perot interferometer sensors using a linearly tunable Er: fiber laser
Author(s): Xiaoke Wan; Henry F. Taylor
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Paper Abstract

A new method for the monitoring of interferometer fiber optic sensors which utilizes a frequency-scanned fiber laser is investigated. The interrogation technique is based on the principle that if the laser frequency varies linearly with time, the optical signal reflected or transmitted is intensity-modulated at a frequency proportional to the optical path difference (OPD) in the interferometer. Fourier components in the detected optical output signal then correspond to the OPDs of any interferometers which have contributed to this modulation. The position of a peak in the power spectrum of this signal is proportional to the OPD of the interferometer responsible for that peak. Fine tuning of the OPD value is determined from the phase of the corresponding Fourier component. Experimentally, an Er:fiber laser scanned over a 46 nm range centered at 1545 nm was used to monitor intrinsic fiber Fabry-Perot interferometers (FFPIs). Variations in the laser scan rate were compensated using the optical signal modulated by a reference FFPI held at constant temperature. For three multiplexed sensors arranged in series, temperature was measured from 20°C to 610°C with a 0.02°C resolution.

Paper Details

Date Published: 3 July 2003
PDF: 7 pages
Proc. SPIE 4974, Advances in Fiber Lasers, (3 July 2003); doi: 10.1117/12.478307
Show Author Affiliations
Xiaoke Wan, Texas A&M Univ. (United States)
Henry F. Taylor, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 4974:
Advances in Fiber Lasers
L. N. Durvasula, Editor(s)

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