Application of background-oriented schlieren (BOS) technique to a laser-induced underwater shock wave

Application of background-oriented schlieren (BOS) technique to a laser-induced underwater shock... 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 1500 m/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. Experiments in Fluids Springer Journals

Application of background-oriented schlieren (BOS) technique to a laser-induced underwater shock wave

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Springer Berlin Heidelberg
Copyright © 2015 by Springer-Verlag Berlin Heidelberg
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
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