Article | REF: E5160 V1

Microphones

Author: Jacques JOUHANEAU

Publication date: March 10, 1991, Review date: January 1, 2020

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3. Electrostatic microphone

3.1 Operating principle

Two metal armatures of surface area S placed face to face at a distance d from each other form a planar capacitor (figure 17 ) of capacitance : $C = ε \frac{S}{d}$

ε is the permittivity of the interelectrode space and is equal to :

$ε_{0} = \frac{1}{36 π \times 10^{9}}$

...

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Electrostatic microphone

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Electret microphone

References

General works

Books

(1) - EARGLE (J.) - The Microphone Handbook. - Elar Publ., New York (1981).
(2) - HUNT (F. V.) - Electroacoustics. - 1954, Harvard University Press, Cambridge. Reprinted by Acoustical Society of America...

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