Measuring and testing – Fluid pressure gauge – With pressure and/or temperature compensation
Patent
1994-01-26
1995-10-24
Chilcot, Richard
Measuring and testing
Fluid pressure gauge
With pressure and/or temperature compensation
73727, 73152, G01L 906, G01L 1904
Patent
active
054600499
ABSTRACT:
A strain gauge exhibits temperature offset errors and span errors which vary from device to device and vary as a function of temperature. A digitally-compensated strain-gauge apparatus executes embedded calibration and compensation programs for improving accuracy over a wide temperature range. Pressure measurement error bands are reduced to approximately to 0.03% of full scale for a 5 psi device over a 0.degree. C. to 50.degree. C. temperature range. A calibration program defines parameters for compensating for such errors. During field operation, a compensation program uses the calibration parameters to generate a more accurate pressure measurement. According to the compensation scheme, current normalized voltage and bridge impedance are derived from the raw data. A first-pass temperature estimate then is derived from the result. The derived first-pass temperature estimate is plugged into a temperature offset error function to find the temperature offset error at the estimated temperature. Such offset error is used to adjust the current normalized voltage. A first-pass pressure estimate is derived from the adjusted current-normalized voltage, then used to correct the bridge impedance. The corrected bridge impedance leads to a corrected temperature estimate, a corrected current normalized voltage and a corrected pressure. The corrected pressure is the compensated pressure measurement.
REFERENCES:
patent: 4366714 (1983-01-01), Adorni
patent: 5228337 (1993-07-01), Sharpe et al.
HydroNet Series H-300 Waterlog Pressure Transducer (brochure), Aug. 1990.
Chilcot Richard
Felber Joseph L.
Instrumention Northwest, Inc.
Koda Steven P.
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