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

Optical Fiber Sensing Based on Reflection Laser Spectroscopy

1,* , 1
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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)


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 which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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