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Jose Miguel Lopez-Higuera
Sensing with light: recent advances and future perspectives
Conferencia Fraunhofer IOF Jena, Jena, Alemania; 08/11/2011.
A. Cobo, J. Mirapeix, J.J. Valdiande, P.B. Garcia-Allende, O.M. Conde, L. Rodriguez-Cobo, F. Anabitarte, J.M. Lopez-Higuera
Optical Fiber Sensors for Welding Quality Monitoring
MOC'11 (The seventeenth Microoptics Conference, Sendai , Japan, pp. 1-4; ISBN: 978-4-86348-182-4; 30/10/2011.
José Miguel López-Higuera
Photonics Sensing Technologies: Several Cases and Trends
14th International SAOT Workshop on Fiber Lasers, Sensors and Materials, Erlangen; Alemania; 27/07/2011. |
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Journal: Optics Express
Paper: Efficient dynamic events discrimination technique for fiber distributed Brillouin sensors AUTHORS: Carlos A. Galíndez, Francisco J. Madruga, Jose M. Lopez-Higuera Abtracts: A technique to detect real time variations of temperature or strain in Brillouin based distributed fiber sensors is proposed and is investigated in this paper. The technique is based on anomaly detection methods such as the RX-algorithm. Detection and isolation of dynamic events from the staticones are demonstrated by a proper processing of the Brillouin gain valuesobtained by using a standard BOTDA system. Results also suggest that better signal to noise ratio, dynamic range and spatial resolution can be obtained. For a pump pulse of 5 ns the spatial resolution is enhanced, (from0.541 m obtained by direct gain measurement, to 0.418 m obtained with thetechnique here exposed) since the analysis is concentrated in the variation ofthe Brillouin gain and not only on the averaging of the signal along the time |
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Estudio del Grupo de Ingeniería Fotónica |
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Journal: Journal of Lightwave Technology
Paper: Fiber Optic Sensors in Structural Health Monitoring (Tutorial Invited)
AUTHORS: J.M. Lopez-Higuera; L. Rodríguez, A. Quintela, A. Cobo
Abstracts:Structural Health Monitoring (SHM) can be understood as the integration of sensing and intelligence to enable the structure loading and damage-provoking conditions to be recorded, analyzed, localized, and predicted in such a way that nondestructive testing becomes an integral part of them. In addition, SHM systems can include actuation devices to take proper reaction or correction actions. SHM sensing requirements are very well suited for the application of optical fiber sensors (OFS), in particular, to provide integrated, quasi-distributed or fully distributed technologies. In this tutorial, after a brief introduction of the basic SHM concepts, the main fiber optic techniques available for this application are reviewed, emphasizing the four most successful ones. Then, several examples of the use of OFS in real structures are also addressed, including those from the renewable energy, transportation, civil engineering and the oil and gas industry sectors. Finally, the most relevant current technical challenges and the key sector markets are identified. This paper provides a tutorial introduction, a comprehensive background on this subject and also a forecast of the future of OFS for SHM. In addition, some of the challenges to be faced in the near future are addressed. |
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