G - Physics – 01 – D
Patent
G - Physics
01
D
354/21, 73/70
G01D 3/02 (2006.01) G01D 18/00 (2006.01) G01L 27/00 (2006.01)
Patent
CA 1294794
METHOD AND APPARATUS FOR AUTOMATIC OFFSET COMPENSATION IN PARAMETER-SENSING TRANSDUCER SYSTEMS Abstract of the Disclosure 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 artificially 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.
539263
Jornod Eugene R.
Mueller James G.
Solar Matthew S.
Invensys Building Systems Inc.
Macrae & Co.
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