Title :
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
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;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2015.2499539
