Low-cost fiber Bragg grating vibroacoustic sensor for voice and heartbeat detection
- 24 September 2008
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 47 (28), 5123-5129
- https://doi.org/10.1364/ao.47.005123
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 , with top sensitivity in the 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.
This publication has 7 references indexed in Scilit:
- Self-mixing based interrogation techniques for high-reflectivity fibre Bragg grating sensorsElectronics Letters, 2008
- Fiber Bragg grating microphone systemApplied Physics Letters, 2006
- Time-division-multiplexed interrogation of fibre Bragg grating sensors using laser diodesMeasurement Science and Technology, 2001
- Fiber grating sensorsJournal of Lightwave Technology, 1997
- In-fibre Bragg grating sensorsMeasurement Science and Technology, 1997
- Bragg grating formation and germanosilicate fiber photosensitivityPublished by SPIE-Intl Soc Optical Eng ,1991
- High-resolution frequency-wavenumber spectrum analysisProceedings of the IEEE, 1969