Thermal noise thermometer
AssigneeYokogawa Electric Works, Ltd.
InventorsAkira Ohte, Makoto Imamura
Life of this patent
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Abstract
A thermal noise thermometer operating on the principle that the temperature of a resistor is related to the magnitude of the thermal noise signal produced in the resistor. The thermoseter comprises a temperature-sensing resistor, a shot noise source, means for selectively applying shot noise signals from the shot noise source to the resistor, a DC amplifier for amplifying the DC signal produced in the resistor, an AC amplifier for amplifying the AC signal produced in the resistor, and means for calculating the temperature to be measured from the output signal of the AC amplifier produced when the shot noise signal is applied to the resistor, the output signal of the AC amplifier produced when no shot noise signal is applied to the resistor, and the output signal of the DC amplifier.
Claims10
A thermal noise thermometer based on the principle that the magnitude of thermal noise signal produced in the resistor is a function of the temperature of the resistor, comprising:
- means to develop a shot noise signal;
- switch means to interruptedly apply said shot noise signal to said resistor;
- voltage-responsive means coupled to said resistor for producing output signals responsive to the voltage thereof in the different conditions of said switch means;
- and
- means coupled to the output of said voltage-responsive means for producing a measurement signal representing the temperature of said resistor.
Dependencies are inferred from the claim text.