Abstract
Sinusoidal tone bursts are generated by an electrodynamic transducer at frequencies from 500 to 10 000 Hz for measurement of material absorptive characteristics. The transducer is placed at one end of a tube and the sample located at the other. Pulse amplitude of the reflected tone burst provides a measure of the normal incidence absorption coefficient of the material. Wave amplitudes are generated that are considerably greater than those achieved on a steady-state basis. Excellent agreement is found between impedance tube measurements and the tone burst technique. Nonlinear absorptive characteristics of material samples have been identified at sound pressure levels approaching 160 dB (re 0.0002 dyn/cm2). [Work supported by NASA, Langley Research Center.]
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