Capacitance-type ultrasonic transducer
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United States of America Patent
Stats
-
Aug 15, 1995
Grant Date -
N/A
app pub date -
Apr 22, 1994
filing date -
Apr 22, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A capacitance-type ultrasonic transducer is disclosed in which a thin insulating plastic film or membrane is coated on one side with a thin film conductor, such as gold, and the back or counter electrode is comprised of a gas permeable conductor material such as sintered bronze. Springs are utilized to apply pressure to maintain good electrical contact between the gold film side of the membrane and an annular conductor. Signals are applied to and taken off of the gas permeable conductor backplate. Due to the porous structure of the back electrode and the gas permeability thereof, variations in ambient presure on the membrane or film are equalized. Ranges of operating freqeuncy can be established by size of particles used to form the sintered electrode.
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