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

Volume

38

Issue

2

fYear

1989

fDate

4/1/1989 12:00:00 AM

Firstpage

428

Lastpage

433

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;

fLanguage

English

Journal_Title

Instrumentation and Measurement, IEEE Transactions on

Publisher

ieee

ISSN

0018-9456

Type

jour

DOI

10.1109/19.192320

Filename

192320