caa a22 4500 606198784 CHVBK 20210128100935.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s00348-015-1960-4 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1960-4 Application of background-oriented schlieren (BOS) technique to a laser-induced underwater shock wave [Elektronische Daten] [Shota Yamamoto, Yoshiyuki Tagawa, Masaharu Kameda] An ultra-high-speed imaging system based on the background-oriented schlieren (BOS) technique has been built in order to capture a laser-induced underwater shock wave. This BOS technique is able to provide two-dimensional density-gradient field of fluid and requires a simple setup. The imaging system consists of an ultra-high-speed video camera, a laser stroboscope, and a patterned background. This system takes images every $$0.2\,\upmu \hbox {s}$$ 0.2 μ s . Furthermore, since the density change of water disturbed by the shock is exceedingly small, the system has high spatial resolution $$\sim \!\!10\,\upmu \hbox {m/pixel}$$ ∼ 10 μ m/pixel . Using this BOS system, temporal position of a shock wave is examined. The position agrees well with that measured by conventional shadowgraph, which indicates that the high-speed imaging system can successfully capture the instantaneous position of the underwater shock wave that propagates with the speed of about 1500m/s. The local density gradient can be determined up to $$O(10^3\,\hbox {kg/m}^4)$$ O ( 10 3 kg/m 4 ) , which is confirmed by the gradient estimated from the pressure time history measured by a hydrophone. Springer-Verlag Berlin Heidelberg, 2015 Yamamoto Shota Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan aut Tagawa Yoshiyuki Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan aut Kameda Masaharu Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan aut Experiments in Fluids Springer Berlin Heidelberg 56/5(2015-05-01), 1-7 0723-4864 56:5<1 2015 56 348 https://doi.org/10.1007/s00348-015-1960-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1960-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamamoto Shota Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan aut NATIONALLICENCE 700 1- Tagawa Yoshiyuki Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan aut NATIONALLICENCE 700 1- Kameda Masaharu Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, Tokyo, Japan aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/5(2015-05-01), 1-7 0723-4864 56:5<1 2015 56 348