Precision thermometry by thermocouples.

概要

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A thermometric method based on the temperature transfer principle has been developed for use in adiabatic low-temperature calorimeters. Temperature difference between the sample and a thermometric block is detected by a thermocouple and the temperature of the latter is regulated to follow that of the former as close as possible by a sensitive thermal servomechanism. The temperature thus tranferred to the thermometric block is measured with a resistance thermometer. Temperature resolution attained is ±0.027mK at 300K, ±0.062mK at 80K, and ±0.20mK at 20K. The thermometric method combines the accuracy of the conventionalresistance thermometry and the small size of the thermocouple junction and is best suitable for application in small-sample calorimeters. An example of calorimetric results obtained with a calorimeter employing the temperature transfer thermometry is presented.
日本熱測定学会の論文