Tuesday, September 17, 1985 3:30 p.m.
Wayne M. Wright
Department of Physics
Thermally generated sound may be significantly enhanced by producing it in an enclosure which has a normal mode at the frequency of interest. A small gas-filled cylindrical container and a line thermal source are used to study the frequency response and efficiency of coupling energy into the acoustic field for axisymmetric modes . An alternating current in a thin , straight wire parallel with the container axis serves as the source of the acoustic waves . A similar system of current technological interest is the resonant optoacoustic spectrometer , for which a modulated laser beam serves as the thermal line source.