Method of and device for fluid surface detection using an ultras

Measuring and testing – Vibration – Resonance – frequency – or amplitude study

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G01H 100

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active

054289971

ABSTRACT:
The present invention provides a method of detecting a fluid surface and a circuit for an ultrasonic transducer for detecting such a fluid surface. In accordance with the method, an ultrasonic transducer driver generates a first voltage proportional to the resonant frequency of the ultrasonic transducer. A reference voltage is generated and the reference voltage and the first voltage are monitored and compared, and a surface detect signal is generated when the first voltage drops below the reference voltage. The circuit of the invention includes means for generating a first voltage proportional to the resonant frequency of the transducer, means for generating a reference voltage, and a comparator for monitoring the first and reference voltages and generating a surface detect signal when the first voltage drops below the reference voltage.

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patent: 4977786 (1990-12-01), Davis
Van Der Burgt, C. M. et al., "Motional Positive Feedback Systems for Ultrasonic Power Generators", IEEE Transactions on Ultrasonics Engineering, Jul. 1963, pp. 2-19.
Neppiras, E. A., "Motional Feed-back Systems for Ultrasonic Transducers".
Bullis, Davis C., et al., "Response of Ultrasonic Motional Bridge Circuits Under Resistive and Reactive Loads", IEEE Transactions on Sonics and Ultrasonics, vol. SU-29, No. 2, Mar., 1982, pp. 92-97.

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