CONDENSER MICROPHONE MODEL - I - APPLICATION OF THE T-MATRIX METHOD OF WATERMAN TO ACOUSTIC SCATTERING FROM AN ELASTIC OBSTACLE

Authors
Citation
W. Kainz, CONDENSER MICROPHONE MODEL - I - APPLICATION OF THE T-MATRIX METHOD OF WATERMAN TO ACOUSTIC SCATTERING FROM AN ELASTIC OBSTACLE, The Journal of the Acoustical Society of America, 104(2), 1998, pp. 907-914
Citations number
13
Categorie Soggetti
Acoustics
ISSN journal
00014966
Volume
104
Issue
2
Year of publication
1998
Part
1
Pages
907 - 914
Database
ISI
SICI code
0001-4966(1998)104:2<907:CMM-I->2.0.ZU;2-E
Abstract
Acoustic scattering of a plane wave from a condenser microphone is inv estigated-and the eigenfrequencies of this coupled acoustic system are calculated. The wave is incident parallel to the axis of a rigid cyli nder, closed at the bottom by an elastic membrane. To take into accoun t the normal modes inside the cylinder a Green's function method is ap plied. Outside the scattering and interaction of the incident plane wa ve with the microphone is treated analytically using the transfer-matr ix method of Waterman. Good agreement of the eigenfrequencies with mea surement is achieved, but only for obstacles which are not too small, i.e., the wavelength is comparable to the dimensions of the microphone (radius a of the microphone membrane is greater than 0.015 m). (C) 19 98Acoustical Society of America. [S0001-4966(98)05908-6].