Abstract
A sensor has been built with two capacitive reciprocal transducers, one used to emit sound, the other acting as a microphone. Since the theoretical impedance functions of tubes are easily obtained, the calibration and the control of the functioning of the sensor are realized by taking detailed measurements of the input impedance of such tubes. This apparatus allows a variety of acoustical impedances to be measured with facility over a frequency range from 0.2–7 kHz.
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