Time-Resolved High-Speed Visualization and Analysis of Underwater Shock Wave Focusing Generated by a Magnetic Pulse Compression Unit

Oshita, D.; Hosseini, Seyed Hamid; Okuda, Yasuo; Miyamoto, Yuji; Sakugawa, Takashi; Katsuki, S.; Akiyama, H.

doi:10.1109/tps.2012.2187541

Cited by 23 publications

(7 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are similar microbubble clusters induced by shockwave in water reported in Ref. [18]. To verify the mechanism of formation of the toroidal bubbles and the microbubble cluster, simulations are used to calculate the pressure variation when a plasma shockwave propagates in the cavity.…”

mentioning

confidence: 57%

Formation and dynamics of a toroidal bubble during laser propelling a cavity object in water

et al. 2013

View full text Add to dashboard Cite

We captured stable self-oscillations of a toroidal bubble moving away from a laser propelled cavity object in water using a high-speed imaging system. The entire laser propelling process generates a hemispherical bubble, two toroidal bubbles, and a microbubble cluster. The hemispherical bubble is formed by laser breakdown in water. The toroidal bubbles are formed by the variation of the pressure field as a result of the propagation, reflection, and convergence of the laser plasma shockwave in the cavity.

show abstract

mentioning

confidence: 57%

Formation and dynamics of a toroidal bubble during laser propelling a cavity object in water

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Successive Shock-Waves Focusing 1) Visualization: Fig. 7 shows results of time-resolved highspeed shadowgraph visualization of underwater shock-waves propagation and focusing from a compact half-ellipsoidal reflector develop in our group [12]- [13]. The reflector was constructed as an extracorporeal shock-wave source with a 20 mm opening diameter.…”

Section: Resultsmentioning

confidence: 99%

“…The gap distance of electrode in the reflector was 0.25 mm. Spherical shock wave was generated by the electric discharge inside the reflector (first focal point) and was focused outside the reflector at the second focal point of the ellipsoidal cavity [13]. Real-time images in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The time-resolved high-speed shadowgraph method used in this experiment has been described in detail in [13]. Briefly, a magnetic pulsed compression circuit (MPC) developed by our group [15], [16] was used as the power source of underwater pulsed discharges.…”

Section: Methodsmentioning

confidence: 99%

“…For medical and biological applications, and especially for clinical therapy, safety is paramount [12]. To improve safety, the sequence from underwater discharge plasma shock-wave generation to the generation of secondary shock waves by cavitation bubbles is an important parameter requiring particular consideration [13]. The pressure of underwater shock waves used in medical applications must be precisely controlled, because minute differences in shock-wave pressure might cause disparate effects on specific cells.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Two Successive Shock Waves Generated by Underwater Pulse Electric Discharge for Medical Applications

Oshita

Hosseini

Mawatari

et al. 2014

IEEE Trans. Plasma Sci.

View full text Add to dashboard Cite

This paper reports on analysis of two different types successive underwater shock waves generated by a device incorporating a compact shock-wave generator with a magnetic pulsed compression circuit. To generate shock waves, underwater pulsed electric discharges in high-impedance saline water were used. The saline water made possible underwater shock waves propagation in tissue with low reflection between the solution and tissue boundary, owing to their similar acoustic impedances. A cylindrical electrode holder and a semiellipsoidal shock-wave focusing reflector/generator were used in this paper. The diameter of the compact shock-wave reflector was 20 mm. Two kinds of successive underwater shock waves, one generated by electric discharge plasma expansion and the other by bubble collapse, were observed. The shock waves were studied by time-resolve high-speed visualization and direct pressure measurement using a fiber optic probe hydrophone pressure transducer. The former method elucidated propagation of underwater shock waves and behavior and collapse of the bubble near the electrodes, while the later measured two kinds of underwater shock waves pressures at different voltage amplitudes using the cylindrical electrode holder and the shock focusing generator. This paper clearly shows the importance of the secondary shock waves, their control, and damping, for effective and safe medical application of shock waves.

show abstract

Shock Waves as Used in Biomedical Applications

Loske

2016

Shock Wave and High Pressure Phenomena

View full text Add to dashboard Cite

Time-Resolved High-Speed Visualization and Analysis of Underwater Shock Wave Focusing Generated by a Magnetic Pulse Compression Unit

Cited by 23 publications

References 13 publications

Formation and dynamics of a toroidal bubble during laser propelling a cavity object in water

Formation and dynamics of a toroidal bubble during laser propelling a cavity object in water

Two Successive Shock Waves Generated by Underwater Pulse Electric Discharge for Medical Applications

Shock Waves as Used in Biomedical Applications

Contact Info

Product

Resources

About