Ma. Rowell et Dj. Oldham, DETERMINATION OF THE DIRECTIVITY OF A PLANAR NOISE SOURCE BY MEANS OFNEAR-FIELD ACOUSTICAL-HOLOGRAPHY .1. THEORETICAL BACKGROUND, Journal of sound and vibration, 180(1), 1995, pp. 99-118
The theoretical basis of the application of the technique of near fiel
d acoustical holography to the measurement of the directivity of a pla
nar noise source is discussed. Problems arising from the application o
f the techniques are identified. These arise primarily from the need t
o work with sampled data over a limited aperture size, as opposed to t
he continuous function assumed in deriving the basic theory. Technique
s for overcoming these problems are suggested including the use of dat
a windows and k-space filtering. A particular problem that is identifi
ed is the need to generate data points in k-space other than those cor
responding to actual samples. Techniques based upon interpolation in k
-space are proposed in order to overcome this problem.