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...

Full description

Saved in:
Bibliographic Details
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
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2010.2077276