With the advent of novel p-u probes the sound intensity technique is having a new flourishing. In particular this approach can be used also in the characterization of the acoustical properties of surfaces. This work applies the "transfer matrix" notation to obtain the complex surface properties after sound intensity measurements are performed inside a plane wave tube. The theoretical background is recalled and several measurement results are presented for typical porous sound absorbing materials. Moreover different experimental implementations of the intensimetric technique based both on the p-p and on the p-u principle are compared. Finally the signal processing implementation is also discussed.© (2006) by the International Institute of Acoustics & Vibration.
On the use of a p-u sound intensity probe for the qualification of complex surface properties
BONFIGLIO, Paolo;PRODI, Nicola;POMPOLI, Francesco;FARINA, Angelo
2006
Abstract
With the advent of novel p-u probes the sound intensity technique is having a new flourishing. In particular this approach can be used also in the characterization of the acoustical properties of surfaces. This work applies the "transfer matrix" notation to obtain the complex surface properties after sound intensity measurements are performed inside a plane wave tube. The theoretical background is recalled and several measurement results are presented for typical porous sound absorbing materials. Moreover different experimental implementations of the intensimetric technique based both on the p-p and on the p-u principle are compared. Finally the signal processing implementation is also discussed.© (2006) by the International Institute of Acoustics & Vibration.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
