ACOUSTIC IMPEDANCE MEASUREMENT, PART I: A REVIEW

In this review, impedance sensors are presented as linear sensors with two entries whose signals are influenced by both pressure and volume velocity. Pressure is generally measured with a microphone, therefore impedance sensors are classified according to the way the volume velocity is determined or controlled. The review touches on the multi-port characterization which is shown to be a generalization of impedance measurement. Finally the question of the calibration and error sources is discussed.