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Development and Validation of a Full Range Acoustic Impedance Tube

The knowledge about the physical properties of materials is of high importance for research and development in acoustics. A standardized method for the determination of acoustic impedances is the impedance measuring tube based on the transfer functions method according to ISO 10534-2. This engineering brief presents the development of an impedance measuring tube with an internal diameter of 8 mm for acoustical impedance measurements in the range of 60 Hz to 20 kHz. The impedance tube was validated by comparison of the measurement results to analytical results of the rigid termination, the open-ended tube, and the empty sample holder.


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