Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1978-03-24
1980-03-11
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310324, 310321, 310358, H01L 4110
Patent
active
041930100
ABSTRACT:
A sensor device having a vibratable surface which can be exposed to variousmaterials and used to determine the presence thereof is disclosed. The device includes a sandwich structure comprising a substrate coated with a piezoelectric material, a pickup electrode joined to the piezoelectric and a drive electrode also joined to the piezoelectric. The piezoelectric material is applied to the substrate as a slurry and when dried forms a ceramic coating which is chemically bonded to the substrate. The sensor is electrically driven to vibrate and depending upon the absence or presence of the material to be detected a characteristic vibrational frequency or amplitude of the sensing surface is observed to indicate contact with such material. Various embodiments are discussed including a rectangular configuration which is cantilevered from a support base and a circular configuration which is held circumferentially by the support base.
REFERENCES:
patent: 3638052 (1972-01-01), Massa
patent: 3745384 (1973-07-01), Blanchard
patent: 3815129 (1974-06-01), Sweany
patent: 3948089 (1976-04-01), Shaw
patent: 4019072 (1977-04-01), Mifune et al.
Brushed-on Piezoelectric Transducers by J. G. Martner, Ultrasonics, vol. 7, No. 4, Oct. 1969, pp.234-237.
Budd Mark O.
Criso Anthony J.
Essex Transducers Corporation
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