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- W2128964552 abstract "Equipment had been constructed for measuring sound absorption in the frequency range from 4 to 100 kHz in a large tube 25.4 cm in diameter and 4.8-m long. The technique employs a large, moveable, solid-dielectric capacitance transducer that completely fills the tube cross section and generates pulses of plane waves. An identical transducer terminates the other end of the tube and serves as a microphone to detect and reflect the sound pulses. Measurements in argon, nitrogen, and air indicate that the attenuation of the sound pulses differs by less than 1% from values calculated for the zero-order mode for frequencies up to 44 times the cutoff frequency for the first ’’nonplane’’ mode. Above that frequency, the measured values are less than those predicted by theory by an amount that is approximately proportional to the wavelength to the −3.1 power. In a smaller tube (5.72-cm inside diameter) of similar construction, the high-frequency deviation from theory is absent. The equipment has been used to measure absorption in moist air at relative humidities from 0% to 100%, and at temperatures from 0° to 100° F. The results of these measurements will be reported in a later paper." @default.
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- W2128964552 date "1977-08-01" @default.
- W2128964552 modified "2023-09-25" @default.
- W2128964552 title "Tube method of sound-absorption measurement extended to frequencies far above cutoff" @default.
- W2128964552 doi "https://doi.org/10.1121/1.381531" @default.
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