Abstract
Methods for measuring acoustic impedance have traditionally been slow, physically bulky, and difficult to accurately implement. A technique known as the two-microphone method is presented, which overcomes these previous limitations. The performace of this method is evaluated by an error study which shows the relationship of the measurement error and the measured impedance load and microphone spacing. The two-microphone method is then compared with another method, the reaction-on-the-source method, and the advantages and disadvantages of both are discussed. The two-microphone method is shown to be robust with loads that are dominantly inertial in the low-frequency limit.
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