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Self-Validating ThermocoupleSelf-Validating Thermocouple (SVT) Systems capable of detecting sensor probe open circuits, short circuits, and unnoticeable faults such as a probe debonding and probe degradation are useful in the measurement of temperatures. SVT Systems provide such capabilities by incorporating a heating or excitation element into the measuring junction of the thermocouple. By heating the measuring junction and observing the decay time for the detected DC voltage signal, it is possible to indicate whether the thermocouple is bonded or debonded. A change in the thermal transfer function of the thermocouple system causes a change in the rise and decay times of the thermocouple output. Incorporation of the excitation element does not interfere with normal thermocouple operation, thus further allowing traditional validation procedures as well.
Document ID
20110000833
Acquisition Source
Headquarters
Document Type
Other - Patent
Authors
Perotti, Jose M.
Mata, Carlos T.
Santiago, Josephine B.
Vokrot, Peter
Zavala, Carlos E.
Burns, Bradley M.
Date Acquired
August 25, 2013
Publication Date
November 30, 2010
Subject Category
Electronics And Electrical Engineering
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-Case-KSC-12875|US-Patent-7,841,771
Patent Application
US-Patent-Appl-SN-11/777,711

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