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
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;
Conference_Titel :
Precision Electromagnetic Measurements, 2002. Conference Digest 2002 Conference on
Conference_Location :
Ottawa, Ontario, Canada
Print_ISBN :
0-7803-7242-5
DOI :
10.1109/CPEM.2002.1034838
