Current sensing noise thermometry: Some recent improvements
- 1 January 1983
- proceedings article
- Published by AIP Publishing in AIP Conference Proceedings
- Vol. 103 (1) , 453-466
- https://doi.org/10.1063/1.34204
Abstract
We report preliminary measurements on several current sensing noise thermometers presently under study in our laboratory. The emphasis of our work is to produce a fast practical absolute thermometer that can be used over the entire temperature range from 4.2 K to .05 mK. The first part of the paper is devoted to demonstrating a practical thermometer based on commercially available rf SQUIDs useful on the temperature range 4.2 K to 2 mK that allows a 1% determination of the absolute temperature with 200 sec of averaging the Johnson noise currents. A comparison of the Johnson noise temperature with the NBS low temperature fixed points is presented. A discussion of the improvements in noise thermometry that are currently possible and under development in our laboratory using low noise dc SQUIDs is given. Using existing dc SQUIDs, it is possible to have a device noise temperature of .01 mK and to determine the absolute temperature to within 1% in 15 sec.Keywords
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