Cryogenic Temperature Measurement with Platinum Resisitance Thermometers-Is Fixed-Point Calibration Adequate

摘要

An analysis of extensive calibration data for strain-free "capsule"-type platinum resistance thermometers indicates that the above question can be answered affirmatively for temperatures down to 14°K. For such thermometers, interpolation can be performed by a numerical procedure that makes use of similarities in the form of the departures of various thermometers from Matthiessen's rule. Where thermometers of more rugged construction or lower purity are concerned, the data needed to answer the question are not available. However it is suggested that the answer may still be "yes" provided the thermometers are sufficiently uniform in their characteristics.