Communications – electrical: acoustic wave systems and devices – Testing – monitoring – or calibrating
Patent
1989-03-03
1990-09-04
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Testing, monitoring, or calibrating
367908, 340621, 73290V, G08B 2100
Patent
active
049549979
ABSTRACT:
The sensor device for detecting the presence or absence of a liquid (2) at predetermined level (N) in a tank (1) comprises a transmitter transducer (51; 51'; 61), a receiver transducer (52, 52', 62), and electronic means (100) for processing the signals applied to the transmission transducer and delivered by the receiver transducer. In the vicinity of the predetermined level (N) of the tank (1), the device includes a detection plate (50; 50', 60) having at least one face (58) which comes into contact with the liquid (2) when the liquid reaches that level. The detection plate carries the transmitter transducer which is disposed for locally generating Lamb waves in the plate, and the plate also carries the receiver transducer which is disposed for detecting the presence or the absence of Lamb waves transmitted along the plate. The receiver transducer is connected to a high gain amplifier whose output is connected to the transmitter transducer so as to form an oscillating closed loop, with oscillations in the loop being interrupted when the liquid reaches the predetermined level (N).
REFERENCES:
patent: 4316183 (1982-02-01), Palmer et al.
patent: 4679430 (1987-07-01), Scott-Kestin et al.
patent: 4735097 (1988-05-01), Lynnworth
Dieulesaint Eugene J.
Legras Olivier R.
Royer Daniel R.
Materiel et Auxiliare de Signalisation et de Controle pour l'Aut
Nawrocki Lawrence M.
Pihulic Daniel T.
Tarcza Thomas H.
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