The large size and electromagnetic interference of microphones array are long standing challenges for sound source localization. Here an all-fibre vector acoustic sensor based on crossed microfiber Bragg gratings (micro-FBGs) has been proposed and experimentally demonstrated that enables the two-dimension sound source localization with a size less than 1.5mm. Two micro-FBGs inscribed in the Co2+-doped fibre are fabricated through a hydrofluoric acid solution, which are placed parallel to each other to form a micro-FBG pair. Based on the self-heating and asymmetric temperature distribution of two Co2+-doped fibres, the crossed micro-FBGs provide a direct two-dimensional measurement of the acoustic particle velocity. The experimental results show that an orientation sensitivity of 1.57 mV/deg for the micro-FBGs is achieved with a figure-of-eight response of the acoustic source direction. Meanwhile, the direction responses of two crossed pairs of micro-FBGs are exactly orthogonal to each other, which could detect the sound source localization. The all-fibre vector acoustic sensor is immune to electromagnetic interference, which appears to have a variety of potential applications, including research in acoustic communication, pipeline monitoring and navigation, etc.

© 2018 The Author(s)

PDF Article
More Like This
Polymer Optical Fibre Sensors for Endoscopic Opto-Acoustic Imaging

Christian Broadway, Daniel Gallego, Getinet Woyessa, Andreas Pospori, Ole Bang, David J Webb, Guillermo Carpintero, and Horacio Lamela
953907 European Conference on Biomedical Optics (ECBO) 2015

Locally Pressed Fibre Bragg Grating Pressure Sensor

Ricardo Correia, Edmon Chehura, Stephen W. James, and Ralph P. Tatam
TuE32 Optical Fiber Sensors (OFS) 2006

Investigation of the Directional Response of Fibre Bragg Grating-Based Acoustic Emission Sensor

Harish Achar, Rajkumar Ramakrishnan, Krishnan Balasubramanian, and Balaji Srinivasan
SM4F.5 Optical Sensors (Sensors) 2012


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access Optica Member Subscription