title: High-Frequency Fiber-Optic Ultrasonic Sensor Using Air Micro-Bubble for Imaging of Seismic Physical Models.
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.
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. tingtinggang1@163.com.
authors.forename: Tingting
authors.initials: T
authors.lastname: Gang
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. huml@nwu.edu.cn.
authors.forename: Manli
authors.initials: M
authors.lastname: Hu
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. qzrong2010@gmail.com.
authors.forename: Qiangzhou
authors.initials: Q
authors.lastname: Rong
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. xgqiao@nwu.edu.cn.
authors.forename: Xueguang
authors.initials: X
authors.lastname: Qiao
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. lianglei@opt.ac.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Liang
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. liu_nan07@163.com.
authors.forename: Nan
authors.initials: N
authors.lastname: Liu
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. tong_rongxin@163.com.
authors.forename: Rongxin
authors.initials: R
authors.lastname: Tong
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. liuxiaobofight@163.com.
authors.forename: Xiaobo
authors.initials: X
authors.lastname: Liu
authors.affiliation: Physics Department, Northwest University, No. 229, Taibai Road (North), Xi'an 710069, China. bc459873556@126.com.
authors.forename: Ce
authors.initials: C
authors.lastname: Bian
keywords: Fabry-Perot interferometer; high frequency ultrasonic detection; ultrasonic imaging