Self-calibrating sensor

Details Self-calibrating sensor Self-calibrating sensor

1994-03-08

1994-11-01

Harvey, Jack B.

Boots, shoes, and leggings

36457103, G01K 1500

Patent

active

053612183

ABSTRACT:
A pressure sensor is electronically corrected for inherent and temperature induced errors. The sensor is characterized with a four term, third order equation. The sensor behavior coefficients for the four terms are themselves each characterized with a three term, second order equation that tracks how the four coefficients change with respect to temperature. The temperature effect coefficients for the three terms in each of the four equations, twelve coefficients in all, are stored in memory. In operation, a microprocessor measures the temperature, retrieves the 12 temperature effect coefficients, solves the four second order equations to obtain the four sensor behavior coefficients, solves the third order equation using the four sensor behavior coefficients and the sensor output to yield the true pressure. In this way, the full spectrum error map of the pressure sensor can be remembered with just 12 coefficients using only 72 bytes of onboard memory. The small memory requirement allows use of fast internal microprocessor memory and easy field recalibration.

REFERENCES:
patent: 4399515 (1983-08-01), Gross
patent: 4592002 (1986-05-01), Bozarth, Jr. et al.
patent: 4644482 (1987-02-01), Juanarena
patent: 4715003 (1987-12-01), Keller et al.
patent: 4817022 (1989-03-01), Jornod et al.
patent: 5135002 (1992-08-01), Kirchner et al.

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