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Electret microphones with stiff diaphragms.

J Hillenbrand1, S Haberzettl1, G M Sessler1

  • 1Institute for Telecommunications Technology, Darmstadt University of Technology, Merckstrasse 25, D-64283 Darmstadt, Germany j.hillenbrand@nt.tu-darmstadt.de, s.haberzettl@nt.tu-darmstadt.de, g.sessler@nt.tu-darmstadt.de.

The Journal of the Acoustical Society of America
|February 12, 2015
PubMed
Summary
This summary is machine-generated.

New electret microphones use stiff plates instead of flexible diaphragms. These robust plate microphones offer high sensitivity and low noise, overcoming limitations of traditional designs.

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Area of Science:

  • Acoustics
  • Materials Science
  • Electrical Engineering

Background:

  • Traditional electret microphones utilize flexible diaphragms that are susceptible to mechanical damage and collapse.
  • Existing microphone designs face challenges with robustness and harmonic distortion.

Purpose of the Study:

  • To introduce and characterize a novel electret microphone design employing stiff plates.
  • To evaluate the performance and advantages of these plate microphones compared to conventional ones.

Main Methods:

  • Development of electret microphones with stiff plates and a polymer spacer ring.
  • Characterization of microphone performance, including sensitivity and noise levels.
  • Creation of an analytical model to predict plate microphone sensitivity.

Main Results:

  • Achieved sensitivities exceeding 10 mV/Pa.
  • Obtained equivalent noise levels as low as 23 dB(A).
  • Demonstrated high mechanical robustness and low harmonic distortion.

Conclusions:

  • The novel plate microphone design offers significant advantages over traditional diaphragm-based microphones.
  • These microphones exhibit excellent robustness, low distortion, and no risk of membrane collapse, making them suitable for demanding applications.