Boots – shoes – and leggings
Patent
1986-07-30
1989-03-28
Lall, Parshotam S.
Boots, shoes, and leggings
364558, 73 4R, 73765, 7386101, G01C 2500, G01N 700, G01L 2700
Patent
active
048170224
ABSTRACT:
Methods and apparatus by which a transducer is employed to create a digital signal representing numerically the value of a changeable physical parameter. The signal from the transducer is subject to large and unpredictable amounts of offset due to either or both (i) manufacturing tolerance departures from the desired target of creating a zero output signal value when the sensed parameter is zero and (ii) changes in offset due to changes in one or more physical conditions (other than the sensed parameter) to which the transducer and its associated electrical components are subjected. A bistate device is associated with the transducer and controlled so as (a) to first apply substitutionally to the transducer a known, and preferably zero, value of the parameter--with the output signal value being stored so as to represent the then-existing offset, and then (b) to apply the changeable physical parameter to the transducer. The stored value of the transducer output signal is, in effect, subtracted from the output signal obtained in the second instance, to produce an accurate final signal numerically representing the existing actual value of the sensed parameter. A programmed microcomputer is preferably employed to carry out the necessary steps in the sequence, and apparatus of that character is described.
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A product known as DATA PRO (a multiple channel data logger) marketed about 1980 by Barber-Colman Company and described in an unpublished Engineering Report dated Apr. 30, 1980. The Report is submitted as describing what was physically in the product which is acknowledged to be in prior art, but the Report itself is not admitted as constituting prior art.
Jornod Eugene R.
Mueller James G.
Solar Matthew S.
Barber-Colman Company
Dixon Joseph L.
Lall Parshotam S.
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