Measuring and testing – Liquid level or depth gauge
Patent
1982-10-29
1985-07-30
Frankfort, Charles
Measuring and testing
Liquid level or depth gauge
73644, G01S 1508
Patent
active
045314063
ABSTRACT:
An ultrasonic liquid quantity measuring apparatus directs a collimated beam of ultrasonic energy from a transmitter transducer (14) through a conveyor (15) into the liquid (11) in a container (10) perpendicular to the top liquid surface. The ultrasonic beam travels with little loss through a tube (20) connected to the conveyor (15) until it reaches the top liquid surface. At this time the energy is reflected and detected with a receiver transducer (14). A microprocessor (34) measures the total signal round trip travel time representing the height of the liquid (11). Using several ultrasonic transducers (14) and knowing the size and shape of the container (10) the quantity of liquid (11) in the container (10) is accurately determined. A calibration (known reflected signal time) transducer (14a) is used to compensate for the change in propagation velocity due to temperature change in the liquid (11). Conventional electronic circuitry including the microprocessor (34) is employed to coordinate the operation of the several transducers (14 and 14a) automatically.
REFERENCES:
patent: 3010318 (1961-11-01), Mongan
patent: 3184969 (1965-05-01), Bolton
patent: 4183007 (1980-01-01), Baird
patent: 4229798 (1980-10-01), Rosie
patent: 4373401 (1983-02-01), Baumoel
Corr Denis E.
Frankfort Charles
Lockheed Corporation
Sullivan John J.
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