Dual-mode self-validating resistance/Johnson noise thermometer system
First Claim
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1. A temperature measuring system comprising:
- a sensor having a resistor;
first signal processor means, having a current source constantly coupled to the sensor, for continuously producing a first temperature signal based on the DC resistance of the sensor resistor; and
second signal processor means, coupled to the sensor, for continuously producing a second temperature signal based exclusively on the a.c. Johnson noise generated by the sensor resistor, said sensor simultaneously and independently measuring DC resistance and AC Johnson noise voltage.
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Abstract
A dual-mode Johnson noise and DC resistance thermometer capable of use in control systems where prompt indications of temperature changes and long term accuracy are needed. A resistance-inductance-capacitance (RLC) tuned circuit produces a continuous voltage signal for Johnson noise temperature measurement. The RLC circuit provides a mean-squared noise voltage that depends only on the capacitance used and the temperature of the sensor. The sensor has four leads for simultaneous coupling to a noise signal processor and to a DC resistance signal processor.
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Citations
14 Claims
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1. A temperature measuring system comprising:
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a sensor having a resistor; first signal processor means, having a current source constantly coupled to the sensor, for continuously producing a first temperature signal based on the DC resistance of the sensor resistor; and second signal processor means, coupled to the sensor, for continuously producing a second temperature signal based exclusively on the a.c. Johnson noise generated by the sensor resistor, said sensor simultaneously and independently measuring DC resistance and AC Johnson noise voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A dual-mode self-validating resistance/Johnson noise thermometer system comprising:
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a four-lead resistive sensor constantly supplied with DC current from a supply to provide a DC potential; means for continuously measuring the DC potential and correlating the measured DC potential to a sensed temperature at the resistive sensor, said potential varying in accordance with variations in temperature at the resistive sensor; and an RLC tuned circuit series connected to the resistive sensor, said RLC tuned circuit series continuously and exclusively measuring noise voltage, said noise voltage varying in accordance with variations in temperature at the resistive sensor, said resistive sensor simultaneously and independently measuring the DC potential and the noise voltage. - View Dependent Claims (14)
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Specification