Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33118
Title: Measurement of in-duct acoustic properties by using a single microphone with fixed position
Authors: Choy, YS
Huang, L
Issue Date: 2004
Publisher: Acoustical Society of America
Source: Journal of the Acoustical Society of America, 2004, v. 116, no. 6, p. 3498-3504 How to cite?
Journal: Journal of the Acoustical Society of America 
Abstract: Acoustic properties of sound absorption materials and other acoustic structures can be measured in an impedance tube using the well-established two-microphone method to resolve the two traveling wave components of a standing wave pattern. The accuracy of such measurements depends crucially on the calibration of the two microphones placed in close proximity. To eliminate such calibration, the one-microphone method [Chu, J. Acoust. Soc. Am. 80, 555-560 (1986)] uses the same microphone to probe at two positions sequentially using the voltage driving the loudspeaker as a reference signal. A variant of this method is introduced in this study in which the microphone is fixed at one position while a rigid end plate moves between two positions to resolve the standing wave. The sound source is installed as a side branch, and its driving signal is also used as a reference in the two-step measurement. Close agreement is found with the established two-microphone method, and factors which might affect the accuracy of the new technique are discussed. As a demonstration of the robustness of the method, a low-budget electret microphone is used and the result also matches well with those obtained by the two-microphone method with high-quality condenser type microphones.
URI: http://hdl.handle.net/10397/33118
ISSN: 0001-4966
EISSN: 1520-8524
DOI: 10.1121/1.1811476
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