Data processing: measuring – calibrating – or testing – Calibration or correction system – Fluid or fluid flow measurement
Reexamination Certificate
2006-02-21
2006-02-21
Hoff, Marc S (Department: 2857)
Data processing: measuring, calibrating, or testing
Calibration or correction system
Fluid or fluid flow measurement
C702S045000, C702S050000, C702S104000, C073S001160, C073S001590, C073S204190
Reexamination Certificate
active
07003418
ABSTRACT:
Temperature compensation methods for physical property sensors are disclosed herein, based on a simple bridge circuit. An imbalance of the bridge circuit can be driven to a zero value, while a supply voltage thereof is simultaneously driven to a level required to bring the heating element to the temperature rise above ambient temperature that optimally compensates for a number of temperature-dependent effects. The heating element can be configured as a thin-film heating material. The resulting total temperature dependence of the measuring system, which includes the heating element, the bridge-circuit with amplifier and the fluid to be measured, can be reduced to a level at which the need for additional digital temperature compensation circuitry and its associated costs may be reduced.
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PCT Notification of Transmittal of The International Search Report and The Written Opinion of the International Searching Authorithy, or the Declaration—Date of Mailing Dec. 22, 2004.
Bonne Ulrich
Kubisiak David
Barbee Manuel L.
Frederick Kris T.
Hoff Marc S
Lopez Kermit D.
Ortiz Luis M.
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