Current sensing noise thermometer
AssigneeRoyal Holloway and Bedford New College
InventorJunyun Li
Life of this patent
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Abstract
A current sensing noise thermometer is described, in which a low noise amplifier is used to measure the noise current in a sensor resistor and the sensor resistor is connected in series with a superconducting coil, or a coil assembly including at least one superconductor. The superconductor of the coil assembly is preferably positioned inside the coil, and the superconducting transition temperature of the superconductor is used to calibrate the thermometer. Preferably, the sensor resistor is grounded to enable particularly low temperatures to be achieved.
Claims22
A current sensing noise thermometer for measuring a temperature of an object comprising a sensor resistor, a low noise amplifier for measuring the noise current in the resistor, and a coil made from superconducting material connected in series between the resistor and the amplifier to allow the superconducting transition temperature of the superconducting material to be used to calibrate the thermometer.
A current sensing noise thermometer for measuring a temperature of an object comprising a sensor resistor, a low noise amplifier for measuring the noise current in the resistor, and a coil assembly comprising a coil made from superconducting material and at least one superconductor positioned in close proximity to the coil to influence the action of the coil, wherein the coil assembly is connected in series between the resistor and the amplifier to allow the superconducting transition temperature of the at least one superconductor of the coil assembly to be used to calibrate the thermometer.
A method of current sensing noise thermometry comprising the steps of positioning a sensor resistor in close proximity to an object whose temperature is to be measured, measuring the noise current in the resistor by means of a low noise amplifier, and recording and/or displaying information derived from the measured noise current which represents the temperature of the resistor, characterized in that a superconducting element is connected to the sensor resistor and at least one superconducting transition temperature of the superconducting element is used for calibration purposes.
Dependencies are inferred from the claim text.