Distributed Fiber Voice Sensor Based on Phase-Sensitive Optical Time-Domain Reflectometry

Author

Yuqing Wu ; Jiulin Gan ; Qingyu Li ; Zhishen Zhang ; Xiaobo Heng ; Zhongmin Yang

Author_Institution

State Key Lab. of Luminescent Mater. & Devices, South China Univ. of Technol., Guangzhou, China

Volume

7

Issue

6

fYear

2015

Firstpage

1

Lastpage

10

Abstract

A fiber-optic phase-sensitive optical time-domain reflectometry (\´-OTDR) distributed sensing system has been proposed and demonstrated for human-voice detecting and reproducing applications. The fiber strain induced by the voice is ultra small (just a few n"); thus, the change of related Rayleigh backscattering light intensity and phase are much too small for effective detection based on the conventional fiber \´-OTDR system. Utilizing the flat-packaged fiber design, the strengthened \´-OTDR system shows better performance with higher signal-to-noise ratio (SNR) up to 35 dB. The audio frequency and amplitude response have been investigated. The multiplexing capability of this distributed optical fiber microphone also has been proved with 1.2-km sensing range and 5-m spatial resolution.

Keywords

distributed sensors; fibre optic sensors; microphones; speech recognition; time-domain reflectometry; Rayleigh backscattering light intensity; SNR; distance 1.2 km; distance 5 m; distributed fiber voice sensor; distributed optical fiber microphone; fiber-optic phase-sensitive optical time-domain reflectometry distributed sensing system; flat-packaged fiber design; human-voice detection; signal-to-noise ratio; spatial resolution; Acoustic waves; Optical fiber couplers; Optical fiber networks; Optical fiber sensors; Optical interferometry; Fiber optics sensors; Rayleigh scattering; Remote sensing and sensors; remote sensing and sensors;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2015.2499539

Filename

7323788