Patent ID: 7573391

Claim:
A temperature sensing system configured for use with a variable reluctance sensor consisting of an electrical conductor winding carrying a magnetically induced alternating current voltage signal, the temperature sensing system comprising: a set of electrical components operatively coupled in a Wheatstone bridge configuration with said electrical conductor winding, said set of electrical components including a plurality of resistors, and said Wheatstone bridge configuration operatively coupled to an electrical ground; a constant voltage source operatively coupled to said Wheatstone bridge configuration; a first capacitive filter circuit operatively coupled to a first node of said Wheatstone bridge configuration, said capacitive filter circuit configured to pass only the magnetically induced alternating current voltage signal from said electrical conductor winding: and a second capacitive filter circuit coupled to said node comprising at least one resistor and one capacitor, said second capacitive filter circuit configured to pass only a temperature dependant DC voltage signal from said electrical conductor winding; wherein said Wheatstone bridge configuration of said set of electrical components consists of five nodes coupled by seven branches; wherein the electrical conductive winding comprises a first of said seven branches; a capacitor is disposed on a second of said seven branches; a first resistor of said plurality of resistors is disposed on a third of said seven branches; a second resistor of said plurality of resistors is disposed on a fourth of said seven branches; a third resistor of said plurality of resistors is disposed on a fifth of said seven branches; a fourth resistor of said plurality of resistors is disposed on a sixth of said seven branches; and a fifth resistor of said plurality of resistors is disposed on a seventh of said seven branches.