Tomographic mapping of airborne sound fields by TV-holography

Tomographic ESPI is a powerful technique for the non-intrusive mapping of a 3D sound field. It has been shown that sophisticated processing of the measurement data from a state-of-the-art ESPI instrument in time-average mode allows to measure the spatial distribution of sound pressure and phase in airborne ultrasound fields. The optical data have been used as input for an acoustic optimization of a parametric array for the nonlinear generation of audio sound that could not have been achieved otherwise.