Patent ID: 8092080
Filing Date: 2012-01-10
Classification: G01K,H04Q

Abstract:
1. In a telemetry system for use in an internal combustion engine, a circuit structure affixed to a moving part of said engine and being disposed for processing information sensed about the temperature of said moving part, said circuit structure being adapted for the high temperature environment of said engine and comprising: a thermocouple disposed on said moving part for sensing a temperature thereof and providing a signal representative of the temperature sensed; an amplifier having an input coupled to an output of said thermocouple and being disposed for amplifying the signal representative of the temperature sensed by said thermocouple; a square wave oscillator disposed for generating a square wave signal having a frequency indicative of a local temperature of said circuit structure; a chopper disposed for converting an output signal of said amplifier into an alternating current signal, said chopper having a first gating input coupled to an output of said square wave oscillator and a second input coupled to an output of said amplifier, said chopper having an output providing a signal having a frequency representative of the local temperature of said circuit and an amplitude representative of the temperature sensed by said thermocouple.