Wireless telemetry circuit structure for measuring temperature in high temperature environments

US8092080B2 · kind B2 · utility

Assignee

• SIEMENS ENERGY, INC. · US

Inventors

• David J. Mitchell · Oviedo, US
• Anand A. Kulkarni · Oviedo, US
• Ramesh Subramanian · Oviedo, US
• Edward R. Roesch · Orlando, US
• Rod Waits · Sunnyvale, US
• Roberto M. Schupbach · Fayetteville, US
• John R. Fraley · Fayetteville, US
• Alexander Lostetter · Fayetteville, US
• Brice McPherson · Fayetteville, US
• Bryon Western · West Fork, US

Key dates

• Filing date: Aug 15, 2008
• Grant date: Jan 10, 2012
• Expiry date: Nov 10, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04Q2209/40
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A circuit affixed to a moving part of an engine for sensing and processing the temperature of the part. The circuit generates a signal representative of the temperature sensed by a thermocouple (110) and amplified by an amplifier (112). A square wave oscillator (113) with a temperature sensitive capacitor (C8) varies its frequency in response to changes of a local temperature of the circuit. A chopper (114, J27) converts the output of the amplifier into an alternating current signal. The chopper is gated by the square wave oscillator and a second input is coupled to an output of the amplifier. Thus, the chopper has an output signal having a frequency representative of the local temperature and an amplitude representative of the thermocouple temperature, whereby the combined signals represent the true temperature of the part.