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Novel Electret Microphone

This paper introduces a new type of electret microphone with an excellent dynamic range (0-120 dB SPL) and excellent frequency response characteristics over the range of 20 Hz to 20 kHz. The fundamental concept behind the new microphone is the placement of a thin PTFE (Teflon) electret membrane insi...

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Published in:	IEEE sensors journal 2011-04, Vol.11 (4), p.988-994
Main Authors:	Bakhoum, E G, Cheng, M H M
Format:	Article
Language:	English
Subjects:	Acoustics Biomembranes Coils electret microphone Electrets Magnetic cores magnetic field sensor Magnetic fields Membranes microphone Microphones Noise levels Polytetrafluoroethylenes SQUIDs Superconducting quantum interference devices Toroidal magnetic fields vibrations
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description	This paper introduces a new type of electret microphone with an excellent dynamic range (0-120 dB SPL) and excellent frequency response characteristics over the range of 20 Hz to 20 kHz. The fundamental concept behind the new microphone is the placement of a thin PTFE (Teflon) electret membrane inside the core of a toroidal coil. As the membrane vibrates in response to the sound, a very small magnetic field is created, is picked up by the coil, and is amplified by a superconducting quantum interference device (SQUID) or by a conventional FET amplifier. Analysis and experimental results show that this new transduction mechanism results in a microphone that, while physically larger than other microphones, has substantially better performance in high-bandwidth applications.
doi_str_mv	10.1109/JSEN.2010.2077276
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Analysis and experimental results show that this new transduction mechanism results in a microphone that, while physically larger than other microphones, has substantially better performance in high-bandwidth applications.</description><subject>Acoustics</subject><subject>Biomembranes</subject><subject>Coils</subject><subject>electret microphone</subject><subject>Electrets</subject><subject>Magnetic cores</subject><subject>magnetic field sensor</subject><subject>Magnetic fields</subject><subject>Membranes</subject><subject>microphone</subject><subject>Microphones</subject><subject>Noise levels</subject><subject>Polytetrafluoroethylenes</subject><subject>SQUIDs</subject><subject>Superconducting quantum interference devices</subject><subject>Toroidal magnetic fields</subject><subject>vibrations</subject><issn>1530-437X</issn><issn>1558-1748</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><recordid>eNpdkE1Lw0AQhhdRsFZ_QPFSvHhK3dnvHKXUL2o9qOBt2WwmmJI2dTcV_PduSPHgaWbgeYeZh5AJ0BkAzW-eXherGaNpZFRrptURGYGUJgMtzHHfc5oJrj9OyVmMa0oh11KPyGTVfmMzXTTou4Dd9Ln2od19tls8JyeVayJeHOqYvN8t3uYP2fLl_nF-u8w8Z6LLXGGcTxc4Q3PGVe4KXhYOgAPVXJpScHSCFS73hSsqarSkSpWyZNppUYLmY3I97N2F9muPsbObOnpsGrfFdh-tUSCVNMASefWPXLf7sE3HWSOBJ0r262CA0h8xBqzsLtQbF34sUNursr0q26uyB1UpczlkakT845M9qUTOfwGgnGJV</recordid><startdate>20110401</startdate><enddate>20110401</enddate><creator>Bakhoum, E G</creator><creator>Cheng, M H M</creator><general>IEEE</general><general>The Institute of Electrical and Electronics Engineers, Inc. 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language	eng
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source	IEEE Electronic Library (IEL) Journals
subjects	Acoustics Biomembranes Coils electret microphone Electrets Magnetic cores magnetic field sensor Magnetic fields Membranes microphone Microphones Noise levels Polytetrafluoroethylenes SQUIDs Superconducting quantum interference devices Toroidal magnetic fields vibrations
title	Novel Electret Microphone
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