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Sensors 2018, 18(6), 1942; https://doi.org/10.3390/s18061942

A Submerged Optical Fiber Ultrasonic Sensor Using Matched Fiber Bragg Gratings

School of Physics, Northwest University, Xi’an 710127, China
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Received: 13 May 2018 / Revised: 8 June 2018 / Accepted: 8 June 2018 / Published: 14 June 2018
(This article belongs to the Section Physical Sensors)
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Abstract

A novel kind of fiber optic ultrasonic sensor based on matching fiber Bragg gratings (FBGs) is proposed and demonstrated. The sensors consist of a pair of matching FBGs fixed to a special bracket. The bracket plays a role in stretching and squeezing the FBGs, with the push–pull effect efficiently coupling the ultrasonic signal to the sensor, thus, improving the sensor’s sensitivity. Side-band filtering technology-based intensity interrogation was used to detect ultrasounds in water. With the synergic effect of the matching FBGs, the sensor performed with a high signal-to-noise ratio (56.9 dB at 300 KHz, 53 dB at 1 MHz and 31.8 dB at 5 MHz) and the observed ultrasonic sinusoidal signals were undistorted and distinguishable in the time domain. View Full-Text
Keywords: fiber optic ultrasonic sensor; matched fiber Bragg grating; sinusoidal ultrasound fiber optic ultrasonic sensor; matched fiber Bragg grating; sinusoidal ultrasound
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bai, X.; Hu, M.; Gang, T.; Rong, Q. A Submerged Optical Fiber Ultrasonic Sensor Using Matched Fiber Bragg Gratings. Sensors 2018, 18, 1942.

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