Thermal Substitution Power Measurement System with RF Self-Heating Temperature Sensor
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United States of America Patent
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Issued Date -
Feb 19, 2015
app pub date -
Aug 14, 2013
filing date -
Aug 14, 2013
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Abandoned
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Abstract
A thermal substitution power measurement system includes an electromechanically-resonant temperature sensor, a temperature measurement circuit coupled to the temperature sensor, an RF power source, and a power controller. The temperature sensor has a temperature-dependent resonance at a first frequency. The temperature measurement circuit generates a temperature signal dependent on the first frequency. The RF power source delivers to the temperature sensor a controllable level of RF power at a second frequency corresponding to a resonance of the temperature sensor and outputs a measure of the RF power delivered to the temperature sensor. The power controller operates in response to the temperature signal to control the RF power delivered to the temperature sensor to maintain the temperature signal constant notwithstanding variations in external power input to the temperature sensor.
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