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21 November 2017 Laser interrogation techniques for high-sensitivity strain sensing by fiber-Bragg-grating structures
G. Gagliardi, M. Salza, P. Ferraro, P. De Natale
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Proceedings Volume 10567, International Conference on Space Optics — ICSO 2006; 105673X (2017) https://doi.org/10.1117/12.2308138
Event: International Conference on Space Optics 2006, 2006, Noordwijk, Netherlands
Abstract
Novel interrogation methods for static and dynamic measurements of mechanical deformations by fiber Bragg-gratings (FBGs) structures are presented. The sensor-reflected radiation gives information on suffered strain, with a sensitivity dependent on the interrogation setup. Different approaches have been carried out, based on laser-frequency modulation techniques and near-IR lasers, to measure strain in single-FBG and in resonant high-reflectivity FBG arrays. In particular, for the fiber resonator, the laser frequency is actively locked to the cavity resonances by the Pound-Drever-Hall technique, thus tracking any frequency change due to deformations. The loop error and correction signals fed back to the laser are used as strain monitor. Sensitivity limits vary between 200 nε/√Hz in the quasi-static domain (0.5÷2 Hz), and between 1 and 4 nε/√Hz in the 0.4-1 kHz range for the single-FBG scheme, while strain down to 50 pε can be detected by using the laser-cavity-locked method.
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G. Gagliardi, M. Salza, P. Ferraro, and P. De Natale "Laser interrogation techniques for high-sensitivity strain sensing by fiber-Bragg-grating structures", Proc. SPIE 10567, International Conference on Space Optics — ICSO 2006, 105673X (21 November 2017); https://doi.org/10.1117/12.2308138
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KEYWORDS
Fiber Bragg gratings
Servomechanisms
Ferroelectric materials
Fiber lasers
Polarization
Resonators
Structured optical fibers
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