SOUND ABSORPTION COEFFICIENT MEASUREMENT SET-UP BY USING LABVIEW AND A SIMPLE IMPEDANCE TUBE
In the article the normal sound absorption coefficient by using the standing wave ratio method is presented employing a particular construction measurement set-up. A simple design of a Standing Wave Apparatus is proposed. The air in the tube is excited using a loudspeaker and a sinusoidal signal in the frequency band permitted by the tube. The pressure is measured along the tube axis while the microphone is displaced to pick the maximum and the minimum pressure of the standing wave close to the sample holder. A LabView application is driving the tones generation, acquisition the sound pressure, process the data and graph the normal sound absorbing coefficient versus frequency on the screen
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