Evaluation of sensing properties of stiffness-sensitive electret microphones

S. Sivaramakrishnan, R. Rajamani

Research output: Contribution to journalArticle

1 Scopus citations


This paper presents an evaluation of the sensing properties of a new thin-film stiffness sensing technology that utilizes commercial electret microphones. The analysis is intended to provide researchers with both quantitative and qualitative information on microphone selection for stiffness sensing applications. The sensing properties examined include sensitivity, selectivity and the effect of microphone's electric field. Specifically, a mathematical method to estimate the stiffness sensitivity of a commercial microphone from its acoustic sensitivity is presented. This method utilizes direct measurements of the microphone's parameters to compute sensitivity to thin-film stiffness changes. The discussion on selectivity focuses on undesired cross-stiffness changes in the microphone membrane in the presence of changes in unrelated environmental analytes. Finally, the influence of the microphone's electric field on its stiffness sensing ability is presented.

Original languageEnglish (US)
Pages (from-to)154-160
Number of pages7
JournalSensors and Actuators, B: Chemical
Issue number1
StatePublished - Aug 18 2009


  • Carbon dioxide sensor
  • Electret microphone
  • Stiffness sensor
  • Thin-film stiffness

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