Title :
Measured Permittivity Ratio of Argon/Helium using Cross Capacitors
Author :
Schmidt, J.W. ; Moldover, M.R. ; Wang, Yicheng
Author_Institution :
Process Meas. Div., NIST, Gaithersburg, MD
Abstract :
In order to improve primary pressure standards at NIST we have measured the dielectric permittivity ratio of argon to helium epsiv Ar/epsivHe using two cross capacitors that were operated side by side in a thermostatted bath (plusmn0.002 K) over a temperature range (273-323) K and over a pressure range (0-6) MPa. For these measurements we have used both an 8-ring toroidal cross capacitor and a 64-rod linear array cross capacitor in pressure chambers separated by a sensitive differential pressure cell
Keywords :
argon; capacitance measurement; capacitors; helium; measurement standards; permittivity measurement; pressure measurement; 0 to 6 MPa; 273 to 323 K; cross capacitors; dielectric permittivity ratio; thermostatted bath; Argon; Capacitors; Dielectric measurements; Helium; Measurement standards; NIST; Permittivity measurement; Pressure measurement; Temperature distribution; Temperature sensors;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2004 Conference on
Conference_Location :
London
Print_ISBN :
0-7803-8494-6
Electronic_ISBN :
0-7803-8494-6
DOI :
10.1109/CPEM.2004.305326
