Abstract
A resonant reciprocity calibration technique for an ultracompliant acoustic transducer is developed. The technique is applied to a magnetohydrodynamic (MHD) transducer with both salt water and mercury as wave‐propagating media. The waves in question are not ordinary acoustic waves, but rather are low‐frequency gravity waves in an open trough. Agreement between the reciprocity calibration and a calibration based on a primary standard is excellent. This result demonstrates that the sensitivity of the MHD transducer is just that given by the simple application of Faraday’s law, in contrast to recent measurements indicating otherwise. This reciprocity technique should be applicable to calibration of a wide range of transducers, including hydrophones and accelerometers.
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