Sensitivity-Improved Ultrasonic Sensor for 3D Imaging of Seismic Physical Model Using a Compact Microcavity

Sensors
Tingting GangQiangzhou Rong

Abstract

A sensitivity-improved ultrasonic sensor is proposed and demonstrated experimentally in this present study. The device is comprised only a fiber-optic microcavity that is formed by discharging a short section of hollow core fiber (HCF). The key to ensuring the success of the sensor relies on the preprocessing of hydrogen loading for HCF. When discharging the HCF, the hydrogen is heated up during the formation of the air bubble, which enlarges the bubble diameter, smoothens its surfaces simultaneously and decreases Young's modulus of the material of the bubble. Ultimately, this results in the probe being highly sensitive to ultrasound with a SNR of 69.28 dB. Once the compact air cavity is formed between the end face of the leading-in fiber and the top wall of the bubble, a well-defined interference spectrum is achieved based on the Fabry⁻Perot interference. By using spectral side-band filtering technology, we detect the ultrasonic waves reflected by the seismic physical model (SMF) and then reconstruct its three-dimensional image.

References

Jun 26, 2002·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Tae Seong JangJung Ju Lee
Apr 2, 2005·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Aldo MinardoMichele Giordano
Jun 11, 2009·The Journal of the Acoustical Society of America·Paul MorrisPaul Beard
Sep 1, 1996·Applied Optics·S G PierceB Culshaw
Dec 14, 2011·Sensors·Honglei GuoJianping Yao
Aug 20, 2016·IEEE Transactions on Medical Imaging·Avinoam Bar-ZionYonina C Eldar

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