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Article

Acousto-Optic Comb Interrogation System for Random Fiber Grating Sensors with Sub-nm Resolution

1
Physics Department, University of Ottawa, Ottawa, ON K1N 6N5, Canada
2
Sensors and Instrumentation Techniques Research Group, Electronics Technology Department, University Carlos III de Madrid, Leganes, 28911 Madrid, Spain
*
Author to whom correspondence should be addressed.
Academic Editors: Pedro J. Rivero and Javier Goicoechea
Sensors 2021, 21(12), 3967; https://doi.org/10.3390/s21123967
Received: 12 May 2021 / Revised: 4 June 2021 / Accepted: 4 June 2021 / Published: 8 June 2021
(This article belongs to the Special Issue Optical Fiber Sensor Development and Applications)
The broad-frequency response and nanometer-range displacements of ultrasound detection are essential for the characterization of small cracks, structural health monitoring and non-destructive evaluation. Those perturbations are generated at sub-nano-strain to nano-strain levels. This corresponds to the sub-nm level and, therefore, to about 0.1% of wavelength change at 1550 nm, making it difficult to detect them by conventional interferometric techniques. In this paper, we propose a demodulation system to read the random fiber grating spectrum using a self-heterodyne acousto-optic frequency comb. The system uses a self-heterodyne approach to extract phase and amplitude modulated signals to detect surface acoustic waves with sub-nanometer amplitudes in the frequency domain. The method can detect acoustic frequencies of 1 MHz and the associated displacement. The system is calibrated via phase detection with a heterodyne interferometer, which has a limited frequency response of up to 200 kHz. The goal is to achieve sub-nanometer strain detection at MHz frequency with random fiber gratings. View Full-Text
Keywords: self-heterodyne comb; random fiber grating; FBG; ultrasound self-heterodyne comb; random fiber grating; FBG; ultrasound
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MDPI and ACS Style

Poiana, D.A.; Garcia-Souto, J.A.; Bao, X. Acousto-Optic Comb Interrogation System for Random Fiber Grating Sensors with Sub-nm Resolution. Sensors 2021, 21, 3967. https://doi.org/10.3390/s21123967

AMA Style

Poiana DA, Garcia-Souto JA, Bao X. Acousto-Optic Comb Interrogation System for Random Fiber Grating Sensors with Sub-nm Resolution. Sensors. 2021; 21(12):3967. https://doi.org/10.3390/s21123967

Chicago/Turabian Style

Poiana, Dragos A., Jose A. Garcia-Souto, and Xiaoyi Bao. 2021. "Acousto-Optic Comb Interrogation System for Random Fiber Grating Sensors with Sub-nm Resolution" Sensors 21, no. 12: 3967. https://doi.org/10.3390/s21123967

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