Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1992-07-20
1995-07-04
Chilcot, Jr., Richard E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
G01H 100
Patent
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.
REFERENCES:
patent: 4275363 (1981-06-01), Mishiro et al.
patent: 4427132 (1984-01-01), Thomson
patent: 4445064 (1984-04-01), Bullis
patent: 4562413 (1985-12-01), Mishiro et al.
patent: 4578650 (1986-03-01), Watson
patent: 4587958 (1986-05-01), Noguchi et al.
patent: 4641053 (1987-02-01), Takeda
patent: 4754186 (1988-06-01), Choperena et al.
patent: 4937466 (1990-06-01), Osterkamp et al.
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.
Chilcot Jr. Richard E.
Oen William L.
Pasteur Sanofi Diagnostics
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