Abstract
Violation of time-reversal invariance for acoustic waves is a new method for characterizing a vorticity field with a double acoustic time-reversal mirror (TRM). Experiments show that the double TRM works as a vorticity amplifier and, even in the case of small vorticity field, provides the characteristics of the flow. Moreover, the TRM works in real-time and allows one to measure the vorticity field at a 20-Hz frequency rate. The case of a Von Karman vortex street is studied experimentally.
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