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Measurement of a Tonpilz transducer in terms of a lumped‐parameter equivalent circuit model
Journal article   Open access   Peer reviewed

Measurement of a Tonpilz transducer in terms of a lumped‐parameter equivalent circuit model

Mark E. Schafer and W. Jack Hughes
The Journal of the Acoustical Society of America, v 71(S1), pp S109-S109
Apr 1982
DOI: https://doi.org/10.1121/1.2019205
url
https://doi.org/10.1121/1.2019205View
Published, Version of Record (VoR)Maybe Open Access (Publisher Bronze),  Open

Abstract

An in‐air measurement procedure has been developed for determining element values in the lumped‐parameter equivalent circuit model for a Tonpilz‐type transducer. The technique first finds the electrical immitance of the transducer at the resonant, antiresonant, and half‐power frequencies, to determine the shunt electrical elements and the motional elements. The electromechanical transformation factor is derived from measurements of the radiating face velocity and the input voltage and current of the transducer at resonance. Once the transformation factor is found, calculated acoustical radiation impedance may be accurately incorporated into the circuit. The utility of the technique lies in the ability to predict the response of the transducer to any acoustic load. Thus, the effects of variations in the acoustic load caused by mutual interaction effects in arrays can be predicted. Results will be shown which indicate the accuracy of the model, and which demonstrate the variations in the transformation factor with frequency.

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