Standard Telephones and Cables Public Limited Company

Ge Infrastructure Sensing, Inc.

David R Hutcherson

Philip G Camp

Eric D Macklen

Victor H Hole

Methods and systems for detecting a temperature Tof a remote object are provided. The method includes storing in memory, a lookup table relating an output voltage of an infrared sensor to a temperature sensed by the infrared sensor V(T, T), determining a temperature sensor voltage output corresponding to a temperature Tproximate the infrared sensor, determining a first voltage as a function of the temperature Tproximate the infrared sensor and a reference temperature T, V(T, T), determining a second voltage as a function of the temperature of the object Tand the reference temperature T, V(T, T) by combining the determined temperature sensor voltage output and the first voltage, and determining a temperature of the object Tfrom the lookup table using the second voltage.

Methods and systems for determining temperature of an object

A temperature sensor for a motor vehicle comprises a composite of PTC and NTC thermistors (1, 2, 3) whose overall temperature characteristic (c) is negative with a plateau (P) centered on the normal working temperature (88.degree. C.) to be sensed, so that tolerances in the sensing system and normal fluctuations of the working temperature will tend not to be registered by the vehicle temperature gauge. Thus only abnormal variations in temperature caused by a fault or overload condition will be indicated.

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Somerset, United Kingdom

David R Hutcherson