Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-12-04
1988-03-29
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310349, 310800, 310334, 310357, H01L 4108
Patent
active
047346116
ABSTRACT:
The invention concerns an ultrasonic sensor (24) in which a polymer foil (4) supported in its peripheral area is piezoelectrically activated at least in a partial section (42). The partial section (42) is electrically coupled to electrodes (8). According to the invention, the electrodes (8), which produce an electrical signal in cooperation with this partial section (42) in response to an ultrasonic wave and are spatially separated from the piezoelectrically active section (42). Because of this feature, the ultrasonic sensor (24) can be used also for measuring ultrasonic shock waves with a high pressure amplitude, since an electrically conductive layer for receiving the electrical signal located on the flat sides of the polymer foil (4) in the piezoelectrically active section (42), is no longer needed.
REFERENCES:
patent: 2646610 (1953-07-01), Williams
patent: 3766615 (1973-10-01), Shimizu
patent: 3912830 (1975-10-01), Murayama et al.
patent: 4048526 (1977-09-01), Taylor
patent: 4079437 (1978-03-01), Sheffield
patent: 4413202 (1983-11-01), Krempl et al.
patent: 4433400 (1984-02-01), De Reggi et al.
patent: 4653036 (1987-03-01), Harris et al.
Ultrasonics, 9/1980, Seiten 123-126, Guilford, GB; K. C. Schotton: "A PVDF Membrane Hydrophone for Operation in the Range 0.5 MHz to 15 MHz".
Ultrasonics, 9/1981, Seiten 213-216, Guilford, GB; P.A. Lewin: "Miniature Piezoelectric Polymer Ultrasonic Hydrophone Probes".
Journal of the Acoustic Society of America, Band 63, No. 3, 3/1981, Seiten 853-859, New York, US; De Reggi, "Piezoelectric Polymer Probe for Ultrasonic Applications".
Budd Mark O.
Siemens Aktiengesellschaft
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