Process to correct a differential pressure signal

Details Process to correct a differential pressure signal Process to correct a differential pressure signal

1996-08-15

1997-04-22

Chilcot, Richard

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

G01L 1904

Patent

active

056231016

ABSTRACT:
A process for correcting differential pressure signals which takes into account the disturbance variables, temperature and static pressure, that influence the absolute pressure and thereby reduce the accuracy of the corrected differential pressure signals. A corrected differential pressure signal is recursively calculated from a measured differential pressure signal, a measured absolute-pressure signal and a temperature signal in combination with a plurality of lower degree correction polynomials. The corrected differential pressure signal may be further processed via a linearization polynomial to produce a linearization correction signal which, when combined with the corrected differential pressure signal, produces a linearization differential pressure signal. Recursivity in the calculation of the corrected differential pressure signal links residual errors into the correction process despite the use of relative simple lower degree correction polynomials. The use of lower degree polynomials renders the process especially suitable for execution on sequential machines.

REFERENCES:
patent: 5197334 (1993-03-01), Guziak
patent: 5329818 (1994-07-01), Frick et al.
patent: 5383367 (1995-01-01), Bertrand et al.
patent: 5394345 (1995-02-01), Berard et al.

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