Measuring and testing – With fluid pressure – Leakage
Patent
1989-07-03
1991-01-15
Williams, Hezron E.
Measuring and testing
With fluid pressure
Leakage
73290V, G01M 324, G01N 2328
Patent
active
049844490
ABSTRACT:
A liquid level measuring system having a tubular ultrasonic probe with a length in excess of the depth of liquid to be measured; for vertical insertion into a tank. A transducer inside the tube, at a first distance above the bottom end of probe body, responds transmits a sinusoidal acoustical pulse through the probe to the surface of the liquid. An echo returns from the surface of the liquid to the transducer and provides a sinusoidal echo signal. A receiver responds to the echo signal by providing a start signal corresponding to the transmitter signal crossing a predetermined amplitude in a predetermined direction and by providing a stop signal corresponding to a first selected echo signal crossing a second predetermined reference level in a predetermined direction. The speed of sound in the liquid is measured by measuring the echo time to a calibration rod in the tube at a known distance from the transducer. A timer measures the time between the start and stop signals and provides the time to a sequential controller. The depth of the liquid and the leak rate of the tank are calculated for display.
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Caldwell Joseph W.
Slobodnik Mark W.
Caldwell System Corp.
Roskos Joseph W.
Williams Hezron E.
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