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. 2008 Oct 1;47(28):5123-9.
doi: 10.1364/ao.47.005123.

Low-cost fiber Bragg grating vibroacoustic sensor for voice and heartbeat detection

Daniele Tosi  1 , Massimo Olivero, Guido Perrone
Affiliations

Low-cost fiber Bragg grating vibroacoustic sensor for voice and heartbeat detection

Daniele Tosi et al. Appl Opt. .

Abstract

A fiber Bragg grating (FBG) vibroacoustic sensor exploiting an intensity-based interrogation principle is presented. The optical system is complemented by signal processing techniques that allow disturbances to be mitigated and improve the spectral estimation. The sensor is capable of performing frequency analysis of sounds up to 3 kHz, with top sensitivity in the 100-500 Hz frequency range, and of dynamically tracking pulsed phenomena that induce a strain to the FBG. The sensor has been applied to the detection of voice, showing a great intelligibility of the speech despite the low-quality environment, and to the monitoring of the heartbeat rate from the wrist.

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