Measuring and testing – Vibration – By mechanical waves
Patent
1991-09-06
1993-05-04
Arana, Louis
Measuring and testing
Vibration
By mechanical waves
73290V, G01N 924
Patent
active
052071014
ABSTRACT:
A two-wire ultrasonic transmitter senses level of a material and controls current of power supplied thereto to a magnitude representing sensed level The transmitter comprises a transducer mounted in proximity to a material, the level of which is being sensed. A power supply circuit receives power for operating the instrument. A drive circuit is connected to the transducer and the power supply circuit and periodically energizes the transducer to transmit an energy pulse to be reflected off of a surface of the sensed material. An amplifier circuit is connected to the transducer and develops an analog signal having a magnitude corresponding to reflected energy received by the transducer. A control circuit is operatively coupled to the drive circuit and the amplifier circuit and determines time difference between a first time when the drive circuit energizes the transducer and a second time when the analog signal is above the threshold, the time difference representing level, and energizes the amplifier circuit for a select minimum time duration commencing subsequent to energization of the transducer and terminating after receipt of a return echo pulse A current control circuit is coupled to the control circuit for controlling current received by the power supply circuit to a magnitude representing sensed level.
REFERENCES:
patent: 4221004 (1980-09-01), Combs et al.
patent: 4229798 (1980-10-01), Rosie et al.
patent: 4400976 (1983-08-01), Blades
patent: 4480323 (1984-10-01), Page
patent: 4523472 (1985-06-01), Blades
patent: 4762001 (1988-08-01), Wuttke
patent: 4785664 (1988-11-01), Reebs
patent: 4821215 (1989-04-01), Woodward
patent: 4853694 (1989-08-01), Tomecek
patent: 4945276 (1990-07-01), Mylvaganam et al.
"A Two-Wire Ultrasonic Level Meter With Piezoelectric Polymer-Film Sensor"-Owada et al., 1988.
Arana Louis
Magnetrol International Inc.
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