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Article

Preliminary Determination of the Optimal Parameters When Using an Ultrasonic Probe to Measure Cavern Geometry Where a Metal Borehole Pipe Is Present

1
Department Geophysics, Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Kraków, Poland
2
The Research and Development Centre for Mining of Chemical Raw Materials, CHEMKOP Sp. z o.o., ul. Józefa Wybickiego 7, 31-261 Kraków, Poland
*
Author to whom correspondence should be addressed.
Academic Editors: Gaofeng Sha and Xiongbing Li
Acoustics 2021, 3(2), 425-441; https://doi.org/10.3390/acoustics3020028
Received: 8 April 2021 / Revised: 2 June 2021 / Accepted: 11 June 2021 / Published: 15 June 2021
(This article belongs to the Special Issue Elastic Wave Scattering in Heterogeneous Media)
In order to determine the optimal parameters when using an ultrasonic probe to measure cavern geometry when a metal borehole pipe is present, an investigation was firstly carried out on influence of a vertical metal plates with a thickness from 1 mm to 15 mm immersed in water on transmitted and reflected ultrasonic waves. The results obtained will be used as an indicator for the measurement of underground geometry in which the ultrasonic probe is placed inside a metal pipe lining a borehole. These studies were performed both by experiment and computer simulation. The results show that the wavelength of the incident ultrasonic signals should be equal to half the thickness of the metal plate or an integer times smaller than this thickness. When the thickness of the barrier is unknown, an ultrasonic signal with linear frequency modulation (LFM) should be used. Due to the reverberation of the ultrasonic waves inside the pipe for caverns filled with water, the distance from the transducer to the cavern wall can be measured if it is longer than three times of the pipe diameter. Frequency analysis of both the reflected and the transmitted waves enables an optimal frequency of the incident ultrasonic wave to be selected, which can be used in the measurement of cavern geometry in conditions in which the ultrasonic probe is inside a metal pipe. View Full-Text
Keywords: ultrasonic wave; acoustic impedance; steel plate barrier; salt cavern ultrasonic wave; acoustic impedance; steel plate barrier; salt cavern
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MDPI and ACS Style

Kubacka, T.; Dinh, C.N. Preliminary Determination of the Optimal Parameters When Using an Ultrasonic Probe to Measure Cavern Geometry Where a Metal Borehole Pipe Is Present. Acoustics 2021, 3, 425-441. https://doi.org/10.3390/acoustics3020028

AMA Style

Kubacka T, Dinh CN. Preliminary Determination of the Optimal Parameters When Using an Ultrasonic Probe to Measure Cavern Geometry Where a Metal Borehole Pipe Is Present. Acoustics. 2021; 3(2):425-441. https://doi.org/10.3390/acoustics3020028

Chicago/Turabian Style

Kubacka, Tomasz, and Chau N. Dinh 2021. "Preliminary Determination of the Optimal Parameters When Using an Ultrasonic Probe to Measure Cavern Geometry Where a Metal Borehole Pipe Is Present" Acoustics 3, no. 2: 425-441. https://doi.org/10.3390/acoustics3020028

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