Ultra sensitive liquid level detector and method

Details Ultra sensitive liquid level detector and method Ultra sensitive liquid level detector and method

1980-03-31

1982-05-18

Gill, James J.

Measuring and testing

Liquid level or depth gauge

340621, G01F 2322

Patent

active

043298753

ABSTRACT:
A highly sensitive liquid level detection system. It employs a piezoelectric transducer that has a natural frequency of vibration which effectively varies depending upon the amount that the transducer is immersed in a liquid. An emf is applied to the transducer to cause it to vibrate at the effective natural frequency, and the exact frequency is counted which count indicates the amount of immersion with a high degree of accuracy. A printer may be employed to periodically record the frequency count.

REFERENCES:
patent: 3110890 (1963-11-01), Westcott et al.
patent: 3133442 (1964-05-01), Werner
patent: 4231250 (1980-11-01), Leber
patent: 4240285 (1980-12-01), Langdon

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