The determinations of the Boltzmann constant

Author

Pitre, L.

Author_Institution

INM/CNAM, LNE, La plaine Saint Denis

fYear

2008

fDate

8-13 June 2008

Firstpage

298

Lastpage

299

Abstract

The international community started recently to look for a new way to define the Kelvin. Different experiments around the world have begun. This presentation will describe very briefly the four different techniques currently used for the redetermination of k, namely the measurement of the speed of sound in pure helium-4, the determination deduce of the Doppler profile of the linear absorption line, the measurement of the noise power in an electrical resistance and finally the change of refractive index in function of the density of pure helium-4.

Keywords

Doppler broadening; acoustic measurement; constants; electric noise measurement; helium; refractive index; temperature measurement; units (measurement); Boltzmann constant; Doppler profile; He; Kelvin; density function; electrical resistance; linear absorption line; noise power measurement; pure helium-4; refractive index; sound speed measurement; Absorption; Acoustic noise; Current measurement; Density measurement; Electric variables measurement; Electrical resistance measurement; Kelvin; Noise measurement; Power measurement; Velocity measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on

Conference_Location

Broomfield, CO

Print_ISBN

978-1-4244-2399-6

Electronic_ISBN

978-1-4244-2400-9

Type

conf

DOI

10.1109/CPEM.2008.4574771

Filename

4574771