Thermal measuring and testing – Thermal calibration system – By thermal radiation emitting device
Patent
1996-01-03
1998-05-05
Chilcot, Richard
Thermal measuring and testing
Thermal calibration system
By thermal radiation emitting device
G01K 1500
Patent
active
057465118
ABSTRACT:
A temperature transmitter and a process control system includes a sensor input for coupling to a temperature sensor having a temperature dependent resistance. The resistance measuring circuitry couples to the sensor input and provides a resistance output related to resistance of the temperature dependent resistance. Analog to digital conversion circuitry couples to the sensor input and provides a digital output related to AC signals across the sensor input. Digital signal processing circuitry isolates a Johnson noise component of the AC signals and provides a digitized Johnson noise output. Temperature measurement circuitry provides a calibrated temperature output based upon the resistance output and the digitized Johnson noise output. Output circuitry transmits the calibrated temperature output over the process control loop.
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Eryurek Evren
Lenz Gary
Chilcot Richard
Oen William L.
Rosemount Inc.
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