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Temperature measurement method using temperature coefficient timing for resistive or capacitive sensors

United States Patent

5,862,170
January 19, 1999
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A method and apparatus for temperature measurement especially suited for low cost, low power, moderate accuracy implementation. It uses a sensor whose resistance varies in a known manner, either linearly or nonlinearly, with temperature, and produces a digital output which is proportional to the temperature of the sensor. The method is based on performing a zero-crossing time measurement of a step input signal that is double differentiated using two differentiators functioning as respective first and second time constants; one temperature stable, and the other varying with the sensor temperature.
Britton, Jr.; Charles L. (Alcoa, TN), Ericson; M. Nance (Knoxville, TN)
Lockheed Martin Energy Research Corporation (Oak Ridge, TN)
08/ 744,357
November 6, 1996
This invention was made with Government support under contract DE-AC05-96OR22464 awarded by the U.S. Department of Energy to Lockheed Martin Energy Research Corporation, and the Government has certain rights in this invention.