Open AccessUltrasonic imaging of seismic physical models using a fringe visibility enhanced fiber-optic Fabry-Perot interferometric sensor
Author(s) -
Wenlu Zhang,
Fengyi Chen,
Wenwen Ma,
Qiangzhou Rong,
Xueguang Qiao,
Ruohui Wang
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.011025
Subject(s) - fabry–pérot interferometer , optics , interferometry , materials science , optical fiber , ultrasonic sensor , fiber optic sensor , diaphragm (acoustics) , collimator , sideband , optical coherence tomography , comb filter , reflectometry , filter (signal processing) , vibration , acoustics , physics , laser , time domain , quantum mechanics , microwave , computer science , computer vision
A fringe visibility enhanced fiber-optic Fabry-Perot interferometer based ultrasonic sensor is proposed and experimentally demonstrated for seismic physical model imaging. The sensor consists of a graded index multimode fiber collimator and a PTFE (polytetrafluoroethylene) diaphragm to form a Fabry-Perot interferometer. Owing to the increase of the sensor's spectral sideband slope and the smaller Young's modulus of the PTFE diaphragm, a high response to both continuous and pulsed ultrasound with a high SNR of 42.92 dB in 300 kHz is achieved when the spectral sideband filter technique is used to interrogate the sensor. The ultrasonic reconstructed images can clearly differentiate the shape of models with a high resolution.