Current sensing noise thermometry using a low T\+v\c\-v\ DC SQUID preamplifier

Describes the design and performance of a current sensing noise thermometer using a DC SQUID as the front end amplifier. The DC SQUID is used to measure the thermal noise current in a resistor and the temperature is then obtained from the Nyquist formula. The thermometer is fast, absolute and precis...

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Bibliographic Details
Published in:Measurement science & technology 2001-01, Vol.12 (1), p.1-15
Main Authors: Lusher, C P, Li |h J., Maidanov |h V. A., Digby |h M. E., Dyball |h H., Casey |h A., Nyeki |h J., Dmitriev |h V. V., Cowan |h B. P., Saunders |h J.
Format: Article
Language:English
Online Access:Get full text
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Summary:Describes the design and performance of a current sensing noise thermometer using a DC SQUID as the front end amplifier. The DC SQUID is used to measure the thermal noise current in a resistor and the temperature is then obtained from the Nyquist formula. The thermometer is fast, absolute and precise and is useable over a wide temperature range below 4.2 K, in principle down to well below 1 mK. It is possible to determine absolute temperature with a precision of 1% in a measuring time of 10 seconds with an amplifier noise temperature of the order of 30 mu K, and to an accuracy better than 0.3%. (Original abstract - amended)
ISSN:0957-0233