Reciprocity calibration of transducers in a plane‐wave resonator

In an article by Rudnick [J. Acoust. Soc. Am. 63, 1923 (1978)] a procedure for the “reciprocity calibration of transducers in unconventional geometries” was described. The theory presented by Rudnick has been tested experimentally and extended to include the effects of the compliance of nonideal transducers on the quality factor of the plane‐wave resonances. A computer controlled system with automated switching was designed and built to acquire and process the resonance data required for the reciprocity calculations. Two reversible transducers and one microphone were mounted in the cylindrical resonant cavity to allow a six‐way round robin self‐consistency check of the experimental precision. The absolute accuracy of the sensitivity thus obtained is then compared with the results of a conventional reciprocity technique [ANSI S1.10‐1966 (R1976)] and/or manufacturers specifications. [Work supported by ONR.]