Broadband Fiber-Optic Acoustic Sensors

A broadband fiber-optic acoustic sensing system is proposed and demonstrated, which is configured by a fiber Bragg grating (FBG) and an erbium-doped fiber (EDF) ring laser. As the acoustic waves can shift the FBG reflective spectrum, the wavelength of the laser output shifts accordingly and this shi...

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Bibliographic Details
Published in:Journal of lightwave technology 2022-06, Vol.40 (12), p.4033-4041
Main Authors: Wei, Heming, Gong, Zhe, Wu, Wenjing, Che, Jiawei, Zhang, Liang, Pang, Fufei, Wang, Tingyun
Format: Article
Language:English
Subjects:
Acoustic emission
Acoustic sensor
Acoustic waves
Bragg gratings
Broadband
Doped fibers
Erbium
Erbium-doped fiber lasers
fiber Bragg grating
Fiber gratings
Fiber lasers
fiber optic sensor
Fiber optics
fiber ring laser
Laser outputs
Mach-Zehnder interferometers
Optical fiber couplers
Optical fiber sensors
Optical interferometry
Ring lasers
Sensitivity
Sensors
unbalanced Mach-Zehnder interferometer
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Summary:A broadband fiber-optic acoustic sensing system is proposed and demonstrated, which is configured by a fiber Bragg grating (FBG) and an erbium-doped fiber (EDF) ring laser. As the acoustic waves can shift the FBG reflective spectrum, the wavelength of the laser output shifts accordingly and this shift is subsequently converted into a corresponding phase shift and demodulated by an unbalanced fiber-optic Mach-Zehnder interferometer (MZI). The sensitivity of the presented sensing system is also investigated, which is a function of the optical path difference of the MZI and the linewidth of the FBG. Due to the adaptability and high sensitivity of the system, it can detect signals with frequencies from tens of hertz to hundreds of kilohertz, which shows the potential for acoustic emission detection in real applications.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2022.3154724