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Sensors 2016, 16(12), 2125; doi:10.3390/s16122125

High-Frequency Fiber-Optic Ultrasonic Sensor Using Air Micro-Bubble for Imaging of Seismic Physical Models

Physics Department, Northwest University, No. 229, Taibai Road (North), Xi’an 710069, China
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Authors to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passar
Received: 24 September 2016 / Revised: 28 November 2016 / Accepted: 30 November 2016 / Published: 14 December 2016
(This article belongs to the Section Physical Sensors)
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Abstract

A micro-fiber-optic Fabry-Perot interferometer (FPI) is proposed and demonstrated experimentally for ultrasonic imaging of seismic physical models. The device consists of a micro-bubble followed by the end of a single-mode fiber (SMF). The micro-structure is formed by the discharging operation on a short segment of hollow-core fiber (HCF) that is spliced to the SMF. This micro FPI is sensitive to ultrasonic waves (UWs), especially to the high-frequency (up to 10 MHz) UW, thanks to its ultra-thin cavity wall and micro-diameter. A side-band filter technology is employed for the UW interrogation, and then the high signal-to-noise ratio (SNR) UW signal is achieved. Eventually the sensor is used for lateral imaging of the physical model by scanning UW detection and two-dimensional signal reconstruction. View Full-Text
Keywords: Fabry-Perot interferometer; high frequency ultrasonic detection; ultrasonic imaging Fabry-Perot interferometer; high frequency ultrasonic detection; ultrasonic imaging
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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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Gang, T.; Hu, M.; Rong, Q.; Qiao, X.; Liang, L.; Liu, N.; Tong, R.; Liu, X.; Bian, C. High-Frequency Fiber-Optic Ultrasonic Sensor Using Air Micro-Bubble for Imaging of Seismic Physical Models. Sensors 2016, 16, 2125.

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