Comparison of different methods of measurement of pressure of underwater shock waves generated by electrical discharge |
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Authors: | A Sayapin A Grinenko S Efimov Ya E Krasik |
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Institution: | (1) Graduate School of Science and Technology, Kobe University, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe 658-0022, Hyogo, Japan;(2) Faculty of Maritime Sciences, Kobe University, 5-1-1 Fukaeminami-machi, Higashinada-ku, Kobe 658-0022, Hyogo, Japan;(3) Hyogo Prefectural Institute of Technology, 3-1-12 Yukihira-chou, Suma-ku, Kobe 654-0037, Hyogo, Japan |
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Abstract: | Different methods for measurement of strong underwater shock waves pressure pulses with peak pressures of up to 200 MPa and
rise time of tens to hundreds of nanoseconds are described and compared. The experimental techniques include direct methods
of pressure measurement using various electromechanical gauges such as quartz, carbon-based, and commercially available PCB
gauges, and nondirect methods based on measurement of the velocity of the shock wave such as time-of-flight and fast-streak
photography. Advantages and disadvantages of the used gauges and methods are discussed. The shock waves were produced by underwater
electrical discharge (discharge current amplitude ≤100 kA, pulse duration ≤5 μs) initiated by an exploding wire. A good correspondence
between the pressure amplitudes measured by the various gauges and methods was observed. The obtained dependence of the shock
wave pressure on the distance from the discharge channel was found to be best fitted by a r
−0.7 law. It is also shown that none of these methods can be used to determine the time evolution of the pressure behind the front
of the shock wave. |
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