Experimental Assessment of a Single-layer Near-field Acoustic Holography Method in an Enclosed Space
Invited paper
KTH Royal Institute of Technology
Tuesday 2 june, 2015, 08:40 - 09:00
0.8 Rome (118)
Abstract:
Planar near-field acoustic holography (PNAH) is preferably performed in
anechoic spaces, since the wave-field extrapolation only holds for outgoing
waves, which makes the study of certain vibro-acoustic sources a troublesome
pursuit. In order to measure in enclosed spaces, a number of imaging
alternatives have been investigated in recent years with the use of double-
layer pressure (or particle velocity) measurements, as well as of single-layer
pressure and velocity measurements. Unlike these methods, our approach is to
use single-layer pressure measurements and extend the PNAH method such that it
is valid in the presence of a parallel reflector. In this paper we address the
experimental validation of the extended PNAH formulation by means of
reconstructing the pressure radiated by an omnidirectional source and
exploring a few excitation frequencies. The reconstruction performance is
investigated via both the free-field and the extended PNAH techniques.