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Demodulation of fiber Bragg grating sensors based on dynamic tuning of a multimode laser diode

Title
Demodulation of fiber Bragg grating sensors based on dynamic tuning of a multimode laser diode
Type
Article in International Scientific Journal
Year
1999
Authors
Ferreira, LA
(Author)
Other
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Diatzikis, EV
(Author)
Other
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Santos, JL
(Author)
FCUP
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Farahi, F
(Author)
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Journal
Title: Applied OpticsImported from Authenticus Search for Journal Publications
Vol. 38
Pages: 4751-4759
ISSN: 1559-128X
Scientific classification
FOS: Natural sciences > Physical sciences
Other information
Authenticus ID: P-001-3P3
Abstract (EN): Dither demodulation of fiber Bragg grating sensors illuminated with multimode light from laser diodes is theoretically and experimentally investigated. Quasi-static temperature and strain sensitivities of 0.09 degrees C/root Hz and 0.6 mu epsilon/root Hz are obtained. We show that it is possible to measure small ac signals that lie outside the feedback loop bandwidth by using a synchronous detection referenced to twice the dither frequency. In this situation, dynamic strain sensitivity of 3.3 n epsilon/root Hz is achieved. (C) 1999 Optical Society of America.
Language: English
Type (Professor's evaluation): Scientific
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