Boots – shoes – and leggings
Patent
1987-07-07
1989-06-20
Lall, Parshotam S.
Boots, shoes, and leggings
324 62, 340584, 374184, 374185, G01K 724, G01R 2702
Patent
active
048414581
ABSTRACT:
The present invention is a technique for forming a digital signal representing an environmental condition. The technique consists of measuring the variable time constant of an analog sensing device having a variable resistance dependent upon the environmental condition and a capacitor as well as measuring the reference time constant of a precision fixed resistor and the same capacitor. The time constants are measured by discharging the capacitor, charging the capacitor through the appropriate element and measuring the time for the voltage across the capacitor to reach a predetermined level. Lastly, the digital ratio between the two time constants is formed. This digital ratio is the digital representation of the environmental condition sensed by said analog sensing device.
REFERENCES:
patent: 3672218 (1972-06-01), Hartman
patent: 3911374 (1975-10-01), Busse et al.
patent: 4150573 (1979-04-01), Iinuma et al.
patent: 4206872 (1980-06-01), Levine
patent: 4362988 (1982-12-01), Weimer
patent: 4492916 (1985-01-01), Johnson
Levine Michael R.
Rigotti Victor
Russo James
Skogler Nicholas
Cosimano Edward R.
Honeywell Incorporated
Lall Parshotam S.
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