Preliminary Determination of the Optimal Parameters When Using an Ultrasonic Probe to Measure Cavern Geometry Where a Metal Borehole Pipe Is Present
| Autor: | Chau Nguyen Dinh, Tomasz Kubacka |
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| Rok vydání: | 2021 |
| Předmět: |
Reverberation
Materials science Physics QC1-999 020209 energy education Borehole Geometry 02 engineering and technology General Medicine 021001 nanoscience & nanotechnology Signal acoustic impedance Wavelength steel plate barrier Transducer 0202 electrical engineering electronic engineering information engineering salt cavern Ultrasonic sensor 0210 nano-technology Acoustic impedance Frequency modulation ultrasonic wave |
| Zdroj: | Acoustics, Vol 3, Iss 28, Pp 425-441 (2021) Acoustics Volume 3 Issue 2 Pages 28-441 |
| ISSN: | 2624-599X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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