TY - GEN
T1 - A method for measuring the absorption coefficient of materials in situ using a parametric loudspeaker
AU - Kuang, Zheng
AU - Ye, Chao
AU - Wu, Ming
AU - Yang, Jun
PY - 2010
Y1 - 2010
N2 - Recently, an array of ultrasonic transducers has been exploited for the directional audible sound reproduction in air by using the nonlinear interaction of sound beams. It is known as a parametric loudspeaker regarding the application of the parametric array theory. This paper investigated the possibility of using a parametric loudspeaker to measure the absorption coefficients of materials. Based on the high directivity and the plane wave property of the selfdemodulated sound from the parametric loudspeaker, the absorption coefficients are respectively measured in an anechoic chamber and in a normal room under the excitation of sweep frequency signals. The experimental results are compared to those obtained by a standing wave tube method, which shows the proposed method is able to measure the absorption coefficients in situ rapidly.
AB - Recently, an array of ultrasonic transducers has been exploited for the directional audible sound reproduction in air by using the nonlinear interaction of sound beams. It is known as a parametric loudspeaker regarding the application of the parametric array theory. This paper investigated the possibility of using a parametric loudspeaker to measure the absorption coefficients of materials. Based on the high directivity and the plane wave property of the selfdemodulated sound from the parametric loudspeaker, the absorption coefficients are respectively measured in an anechoic chamber and in a normal room under the excitation of sweep frequency signals. The experimental results are compared to those obtained by a standing wave tube method, which shows the proposed method is able to measure the absorption coefficients in situ rapidly.
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M3 - Conference contribution
AN - SCOPUS:84871445882
SN - 9781617822551
T3 - 17th International Congress on Sound and Vibration 2010, ICSV 2010
SP - 2179
EP - 2185
BT - 17th International Congress on Sound and Vibration 2010, ICSV 2010
T2 - 17th International Congress on Sound and Vibration 2010, ICSV 2010
Y2 - 18 July 2010 through 22 July 2010
ER -