Title :
Precision AC measurements of temperature below 90 K
Author :
Levine, Paul D. ; Jaeger, K.B. ; Mellons, Brad E.
Author_Institution :
Lockheed Missiles & Spacecraft Co., Sunnyvale, CA, USA
fDate :
4/1/1989 12:00:00 AM
Abstract :
Specially designed sealed cells filled with ultrapure gas have been utilized for the realization of thermodynamic fixed points in the Primary Standards Laboratory. Accurate determination of the triple-point temperatures of Ar, N2, O2, Ne, and D2 was accomplished with a high-precision AC resistance bridge operating at a frequency of 30 Hz. Detailed data obtained for platinum resistance thermometers (PRTs) and rhodium-iron (Rh-Fe) sensors are presented. The levels of accuracy and precision achieved are evaluated
Keywords :
bridge instruments; critical points; electric sensing devices; iron alloys; low-temperature techniques; measurement standards; platinum; resistance thermometers; rhodium alloys; temperature measurement; 30 Hz; 90 K; AC measurements; Ar; D2; N2; Ne; O2; Primary Standards Laboratory; Pt resistance thermometer; Rh-Fe sensor; resistance bridge; sealed cells; thermodynamic fixed points; triple-point temperatures; ultrapure gas; Argon; Bridges; Frequency; Laboratories; Measurement standards; Platinum; Temperature measurement; Temperature sensors; Thermal resistance; Thermodynamics;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
