DocumentCode
2283229
Title
Volume of the Avogadro sphere: diameter determination with the spheres interferometer
Author
Nicolaus, R.A. ; Bonsch, G.
Author_Institution
Phys. Tech. Bundesanstalt, Braunschweig, Germany
fYear
2002
fDate
16-21 June 2002
Firstpage
296
Lastpage
297
Abstract
For the new determination of Avogadro´s constant, N/sub A/, one part of the measuring task consists in the high accuracy determination of the volume of a silicon sphere with a mass of 1 kg and a diameter of about 90 mm. An interferometer with spherical reference surfaces has been designed for this specific purpose. The measuring principle of the interferometer and first measurements on silicon spheres are described.
Keywords
diameter measurement; light interferometry; measurement by laser beam; silicon; 1 kg; 45 mm; Avogadro sphere volume; Avogadro´s constant; Si; Si sphere; diameter determination; spherical Fizeau interferometer; spherical reference surfaces; tunable diode laser; Frequency; Interference; Laser tuning; Lenses; Optical interferometry; Performance evaluation; Silicon; Surfaces; Volume measurement; Wavelength measurement;
fLanguage
English
Publisher
ieee
Conference_Titel
Precision Electromagnetic Measurements, 2002. Conference Digest 2002 Conference on
Conference_Location
Ottawa, Ontario, Canada
Print_ISBN
0-7803-7242-5
Type
conf
DOI
10.1109/CPEM.2002.1034838
Filename
1034838
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