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Thin Bilaminar Piezodisks Used as Microphone and Telephone Membranes

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Properties of thin bilaminar disks of a piezoceramic material are discussed. The acousto-electrical transducer properties can be simply described in terms of the resonance frequency and the coupling constant of the ceramic disk. For example, the sensitivity when used in a microphone does not vary with the disk diameter, provided the resonance frequency remains the same. Thus, the making of thinner disks permits the construction of smaller microphones.

JAES Volume 17 Issue 2 pp. 174, 175; April 1969
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