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Measurement of microphone membrane displacement with an optical beam deflection technique

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3 Author(s)
Benedetto, G. ; Istituto Elettrotecnico Nazionale Galileo Ferraris, Strada delle Cacce 91, 10135 Torino, Italy ; Gavioso, Roberto ; Spagnolo, R.

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Optical beam deflection is a simple and reliable method for the detection of small displacements. This paper describes its application to the measurement of the displacement of the membrane of a condenser microphone, where the displacement is induced by supplying an alternate voltage to the transducer terminals. A sensitive reconstruction of the dynamic deformation of a microphone membrane in a wide frequency range is obtained. © 1995 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:66 ,  Issue: 12 )

Date of Publication:

Dec 1995

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