Simple differential thermometer for low temperatures using a thermocouple with a SQUID detector
- 1 August 1983
- journal article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 54 (8) , 946-948
- https://doi.org/10.1063/1.1137507
Abstract
Details of design and construction of a simple and rugged thermocouple differential thermometer are presented. Gold +0.03 at. % iron wire is used, with niobium leads connected to a SQUID. It is demonstrated that at 1 K the response time is about 15 ms and that the temperature sensitivity of 10−7 K with a 10-Hz filter is Johnson-noise limited. Additional qualities such as small size, little self-heating, and high reproducibility make this device ideal for differential thermometry at low temperatures.Keywords
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- Properties of gold + 0·03 per cent (at.) iron thermoelements between 1 and 300° K and behaviour in a magnetic fieldCryogenics, 1964