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Chemical Sensing Using Fiber Cavity Ring-Down Spectroscopy
Sensors 2010, 10(3), 1823-1845; doi:10.3390/s100301823
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Optical Fiber Sensing Based on Reflection Laser Spectroscopy

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1 Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), Via Campi Flegrei, 34 I-80078 Napoli, Italy 2 Engineering Photonics Group, School of Engineering, Cranfield University, Bedford MK43 OAL, UK 3 Central Glass & Ceramic Research Institute (CSIR), 196, Raja S.C.Mullick Road, Kolkata-700 032, India 4 Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6, Canada 5 Centre for Gravitational Physics, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia
* Author to whom correspondence should be addressed.
Received: 5 January 2010 / Revised: 3 February 2010 / Accepted: 5 February 2010 / Published: 5 March 2010
(This article belongs to the Special Issue Laser Spectroscopy and Sensing)

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.
Keywords: Fiber Bragg gratings; fiber resonator; Pound-Drever-Hall method; frequency locking; laser-frequency modulation; high-birefringence fiber Fiber Bragg gratings; fiber resonator; Pound-Drever-Hall method; frequency locking; laser-frequency modulation; high-birefringence fiber
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Gagliardi, G.; Salza, M.; Ferraro, P.; Chehura, E.; Tatam, R.P.; Gangopadhyay, T.K.; Ballard, N.; Paz-Soldan, D.; Barnes, J.A.; Loock, H.-P.; Lam, T.-Y.; Chow, J.H.; De Natale, P. Optical Fiber Sensing Based on Reflection Laser Spectroscopy. Sensors 2010, 10, 1823-1845.

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