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Optical Fiber Sensing Based on Reflection Laser Spectroscopy

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Author(s): Gianluca Gagliardi | Mario Salza | Pietro Ferraro | Edmond Chehura | Ralph P. Tatam | Tarun K. Gangopadhyay | Nicholas Ballard | Daniel Paz-Soldan | Jack A. Barnes | Hans-Peter Loock | Timothy T.-Y. Lam | Jong H. Chow | Paolo De Natale

Journal: Sensors
ISSN 1424-8220

Volume: 10;
Issue: 3;
Start page: 1823;
Date: 2010;
Original page

Keywords: Fiber Bragg gratings | fiber resonator | Pound-Drever-Hall method | frequency locking | laser-frequency modulation | high-birefringence fiber

ABSTRACT
An overview on high-resolution and fast interrogation of optical-fiber sensors relying on laser reflection spectroscopy is given. Fiber Bragg-gratings (FBGs) and FBG resonators built in fibers of different types are used for strain, temperature and acceleration measurements using heterodyne-detection and optical frequency-locking techniques. Silica fiber-ring cavities are used for chemical sensing based on evanescent-wave spectroscopy. Various arrangements for signal recovery and noise reduction, as an extension of most typical spectroscopic techniques, are illustrated and results on detection performances are presented.

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