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Title: Electronic multi-purpose material level sensor

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.
Inventors:
 [1]
  1. (Livermore, CA)
Issue Date:
OSTI Identifier:
870854
Assignee:
Regents of University of California (Oakland, CA) LLNL
Patent Number(s):
US 5609059
Contract Number:
W-7405-ENG-48
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Country of Publication:
United States
Language:
English
Subject:
electronic; multi-purpose; material; level; sensor; based; time; domain; reflectometry; tdr; electrical; pulses; propagated; transmission; line; partially; immersed; liquid; powder; substance; grain; silo; difference; reflections; start; air; interface; determine; levels; 01; inch; essentially; independent; circuit; element; temperature; variations; mass; produced; extremely; price; goubau; microstrip; coaxial; cable; twin; lead; cps; cpw; typically; strip; placed; inside; wall; tank; reflected; contain; information; strata; sludge-build-up; bottom; oil; reflected pulses; material level; domain reflectometry; temperature variations; level sensor; transmission line; coaxial cable; electrical pulses; inside wall; time domain; circuit element; temperature variation; partially immersed; time difference; electrical pulse; reflected pulse; multi-purpose material; liquid interface; mass produced; electronic multi-purpose; /73/342/