Measuring and testing – Liquid level or depth gauge
Patent
1994-12-19
1997-03-11
Cuchlinski, Jr., William A.
Measuring and testing
Liquid level or depth gauge
73290V, 342124, G01S 1300
Patent
active
056090595
ABSTRACT:
The present electronic multi-purpose material level sensor is based on time domain reflectometry (TDR) of very short electrical pulses. Pulses are propagated along a transmission line that is partially immersed in a liquid, powder, or other substance such as grain in a silo. The time difference of the reflections at the start of the transmission line and the air/liquid interface are used to determine levels to better than 0.01 inch. The sensor is essentially independent of circuit element and temperature variations, and can be mass produced at an extremely low price. The transmission line may be a Goubau line, microstrip, coaxial cable, twin lead, CPS or CPW, and may typically be a strip placed along the inside wall of a tank. The reflected pulses also contain information about strata within the liquid such as sludge-build-up at the bottom of an oil tank.
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Cuchlinski Jr. William A.
Sartorio Henry P.
The Regents of the University of California
Worth Willie Morris
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