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An acoustic technique for Lagrangian velocity measurements

Abstract : Ultrasonic transducers array can be used to track solid particles advected by a turbulent flow. The simultaneous use of four linear antennas of transducers gives the 3D position of the particles. The extraction of the Doppler frequency shift gives a precise estimation of velocity components. We describe the principle of the technique, the signal conditioning and the acquisition schemes. We show briefly the performances of the technique applied to a turbulent flow at high Reynolds number. The dynamical range of the measurement is over 55 dB and the frequency response spans over 2 decades. These performances allow us to investigate the inertial time scales of Lagrangian turbulence.
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Contributor : Jean-François Pinton Connect in order to contact the contributor
Submitted on : Friday, October 19, 2007 - 9:54:17 AM
Last modification on : Wednesday, November 17, 2021 - 12:26:54 PM
Long-term archiving on: : Monday, September 24, 2012 - 2:10:29 PM


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  • HAL Id : ensl-00180416, version 1


Nicolas Mordant, Pascal Metz, Jean-François Pinton, Olivier Michel. An acoustic technique for Lagrangian velocity measurements. Review of Scientific Instruments, American Institute of Physics, 2005, 76 (1), pp.025105. ⟨ensl-00180416⟩



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