Boots – shoes – and leggings
Patent
1989-11-30
1991-09-24
Lall, Parshotam S.
Boots, shoes, and leggings
36457101, 73 1H, 73304C, 340618, 340620, 331 65, G01F 2326, G01R 2700
Patent
active
050519212
ABSTRACT:
A liquid level and composition sensor includes a first interdigitated capacitor mounted substantially vertically in a tank, and a second interdigitated capacitor mounted substantially horizontally in and near the bottom of the tank. An electronic processor is responsive to the value of capacitance of the first capacitor for producing a first voltage signal proportional to the level of the liquid in the tank and is responsive to the value of capacitance of the second capacitor for producing a second voltage signal having a voltage level corresponding to the composition or dielectric constant of the liquid. The processor also multiplies the first and second voltage signals together to produce a liquid level voltage output signal having a constant slope for voltage amplitude versus liquid level, regardless of the composition of the liquid in the tank.
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Suzuki, K. et al., "A Highly Accurate Fuel Level Measuring System", SAE Technical Paper Series 871961, Oct. 19, 1989.
Burke W. J.
David Sarnoff Research Center Inc.
Lall Parshotam S.
Mattson Brian M.
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