Jacobsen F., Jaud V.

Statistically optimised near field acoustic holography (SONAH) is a variant of conventional near field acoustic holography (NAH) that avoids spatial transforms and thus some of the errors and limitations caused by spatial transforms. In particular the truncation effects due to the spatial transforms in the NAH procedure (‘leakage’ and ‘wrap-around errors’) are avoided, and thus the usual requirement of a measurement aperture that extends well beyond the source can be relaxed. Both NAH and SONAH are usually based on measurements of the sound pressure. However, a recent investigation has showed that NAH based on measurement of the normal component of the acoustic particle velocity is more accurate and less sensitive to transducer mismatch errors that NAH based on measurement of the sound pressure. In this investigation it is examined whether there is a similar advantage in using the particle velocity in SONAH.