H - Electricity – 04 – R
Patent
H - Electricity
04
R
349/65
H04R 17/00 (2006.01) G01F 23/28 (2006.01)
Patent
CA 1129541
ABSTRACT OF THE DISCLOSURE A sensor device having a vibratable surface which can be exposed to various materials 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.
323596
Essex Transducers Corporation
Swabey Ogilvy Renault
LandOfFree
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