Bidirectional Electrostatic Microphone with Segmented Back-Plate
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F24%3A00376295" target="_blank" >RIV/68407700:21230/24:00376295 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1109/JSEN.2024.3426093" target="_blank" >https://doi.org/10.1109/JSEN.2024.3426093</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1109/JSEN.2024.3426093" target="_blank" >10.1109/JSEN.2024.3426093</a>
Alternative languages
Result language
angličtina
Original language name
Bidirectional Electrostatic Microphone with Segmented Back-Plate
Original language description
This study investigates the directivity of electrostatic (condenser) microphones featuring a circular membrane and a back-plate segmented into four parts. We analyze the relationship between the direction of arrival of incoming sound pressure waves and the non-axisymmetrical displacement field of the membrane using both analytical and numerical models. Since the output voltage of an electrostatic microphone is proportional to the mean value of the membrane displacement over the fixed electrode surface, the membrane displacement field influenced by the acoustic pressure field inside the transducer must be accurately calculated. By subtracting the output voltage signals from two opposite electrodes, we obtain two directional outputs with bidirectional directivity patterns perpendicular to each other. To validate our theoretical findings, we conduct measurements on an experimental transducer specimen. The experimental results, obtained using a scanning laser vibrometer to analyze the membrane displacement field and directivity measurements performed in an anechoic chamber, confirm our theoretical predictions. Bidirectional patterns at both outputs, which are perpendicular to each other, are observed in the frequency range corresponding to the pass band of the transducer, except at very low frequencies where phase problems occur.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10307 - Acoustics
Result continuities
Project
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Continuities
S - Specificky vyzkum na vysokych skolach
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
IEEE Sensors Journal
ISSN
1530-437X
e-ISSN
1558-1748
Volume of the periodical
24
Issue of the periodical within the volume
16
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
25486-25492
UT code for WoS article
001295190900141
EID of the result in the Scopus database
2-s2.0-85199065084