Energy trapped piezoelectric resonator liquid sensor

Details Energy trapped piezoelectric resonator liquid sensor Energy trapped piezoelectric resonator liquid sensor

1984-06-29

1986-01-21

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310320, 310323, 310337, 310366, 310340, H01L 4108

Patent

active

045659427

ABSTRACT:
A liquid sensor mounted on the side wall of a liquid tank for detecting the existence of liquid in the tank. The sensor includes an element which generates a vibration in the direction of its thickness, of energy-trapped type for detecting the existence of liquid. The element consists of electrodes provided on both sides of a piezo-electric substrate, one side of the element for contacting the liquid in the tank being covered with a liquid-proof coating. The existence of liquid is detected from the change in resonance impedance or antiresonance impedance resulting from the liquid contact.

REFERENCES:
patent: 2814575 (1957-11-01), Lange, Jr.
patent: 3110890 (1963-11-01), Westcott et al.
patent: 3253219 (1966-05-01), Littler
patent: 3401276 (1968-09-01), Curran et al.
patent: 3706981 (1972-12-01), Hart
patent: 4117074 (1978-09-01), Tierstein et al.
patent: 4175243 (1979-11-01), Corbett
patent: 4469976 (1984-09-01), Scott

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