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Recent Advances in Forward Brillouin Scattering: Sensor Applications

Authors :
Luis A. Sánchez
Antonio Díez
José Luis Cruz
Miguel V. Andrés
Source :
Sensors, Vol 23, Iss 1, p 318 (2022)
Publication Year :
2022
Publisher :
MDPI AG, 2022.

Abstract

In-fiber opto-mechanics based on forward Brillouin scattering has received increasing attention because it enables sensing the surrounding of the optical fiber. Optical fiber transverse acoustic resonances are sensitive to both the inner properties of the optical fiber and the external medium. A particularly efficient pump and probe technique—assisted by a fiber grating—can be exploited for the development of point sensors of only a few centimeters in length. When measuring the acoustic resonances, this technique provides the narrowest reported linewidths and a signal-to-noise ratio better than 40 dB. The longitudinal and transverse acoustic velocities—normalized with the fiber radius—can be determined with a relative error lower than 10−4, exploiting the derivation of accurate asymptotic expressions for the resonant frequencies. Using this technique, the Poisson’s ratio of an optical fiber and its temperature dependence have been measured, reducing the relative error by a factor of 100 with respect to previously reported values. Using a single-point sensor, discriminative measurements of strain and temperature can be performed, achieving detection limits of ±25 με and ±0.2 °C. These results show the potential of this approach for the development of point sensors, which can be easily wavelength-multiplexed.

Details

Language :
English
ISSN :
14248220
Volume :
23
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.8fe39ec75a364965b4e85e7ae1808eae
Document Type :
article
Full Text :
https://doi.org/10.3390/s23010318