Enhancing RTD measurement accuracy by means of variable excitation current
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United States of America Patent
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Jan 31, 2023
Grant Date -
Aug 19, 2021
app pub date -
Feb 13, 2020
filing date -
Feb 13, 2020
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Abstract
A method, apparatus and system for measuring a temperature can involve measuring a voltage with a resistance temperature detector using a variable excitation current, and deriving a process temperature from the voltage measured by the resistance temperature detector. The process temperature can be further derived by applying a plurality of values of the variable excitation current, measuring corresponding values of voltage, and estimating a resistance by applying a least square estimation. The process temperature can also be derived by applying a different value of the variable excitation current at every iteration, using a recursive least square estimation to measure a resistance, and using confidence intervals for instrument diagnostics.
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