Communications – electrical: acoustic wave systems and devices – Echo systems – Returned signal used for control
Patent
1991-09-16
1992-09-22
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Echo systems
Returned signal used for control
367 99, 367908, 367900, 367902, G01S 966
Patent
active
051503344
ABSTRACT:
A system for monitoring level of material in a vessel that includes a transducer for transmitting an ultrasonic signal toward and receiving an echo signal from a surface of the material, and a power switch coupled to the transducer for energizing the transducer to transmit the ultrasonic signal. A microprocessor-based controller has an output coupled to the power switch for controlling operation thereof. The output of the microprocessor provides a pulsed periodic signal to the power switch at controllably variable frequency, duty cycle and/or total burst duration to operate the transducer at an ultrasonic frequency that corresponds to the periodic signal frequency, duty cycle and burst duration. The echo signals are compared to successive thresholds between the transmission bursts, and echo signal data is sampled and stored in the microprocessor over a measurement cycle that includes multiple transmission bursts. The true echo signal from the material surface is distinguished from pulse echo signals as a combined function of amplitude and time duration data so stored.
REFERENCES:
patent: 4264788 (1981-04-01), Keidel et al.
patent: 4427132 (1984-01-01), Thomson
patent: 4928525 (1990-05-01), Aderholt et al.
patent: 4953141 (1990-08-01), Novak et al.
Bindicator Company
Pihulic Daniel T.
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