A Simple Method to Extend the Range of Low Temperature Resistance Thermometers
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Resistance thermometers show saturation effects at temperature below around 20 mK. A simple method to extend the range of low temperature resistance thermometers is proposed. The temperatures to be measured are shifted to an upper range where the resistance thermometer does not saturate. The shifting is controlled by an electrically supplied power which heats a metal–insulator junction. A simple mathematical relation between the temperature of interest and the temperatures measured by the resistance thermometer was found for measured temperatures between 20 mK and 60 mK. The difference between the temperatures measured by a calibrated CMN thermometer and the values obtained from the proposed method was evaluated as less than 0.5 %.
KeywordsContact thermal resistance Cryogenic thermometry Millikelvin thermometry
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