Influence of the optical quality of the interferometer optics on the diameter measurement of the Avogadro silicon sphere

Author

Nicolaus, R. Arnold ; Bartl, Guido

Author_Institution

Phys.-Tech. Bundesanstalt (PTB), Braunschweig

fYear

2008

fDate

8-13 June 2008

Firstpage

412

Lastpage

413

Abstract

Within the International Avogadro Project measurements of molar mass and lattice parameter of a silicon single crystal and mass and volume of a high precision silicon sphere made of the same crystal are combined to calculate Avogadro´s constant. As an overall uncertainty of 2ldr10^-8 is aimed at, the determination of the volume of the Avogadro sphere requires unequalled precision in absolute interferometry. Especially systematical influences on an experimental setup can only be detected, if relevant influencing parameters can be varied. The spheres interferometer of PTB offers a unique way to investigate the influence of its optical components.

Keywords

diameter measurement; elemental semiconductors; light interferometry; measurement uncertainty; silicon; Avogadro constant; Avogadro silicon sphere; Si; absolute interferometry; diameter measurement; interferometer optics; lattice parameter; measurement uncertainty; molar mass measurement; optical components; optical quality; silicon single crystal; volume measurement; Density measurement; Lattices; Lenses; Optical devices; Optical interferometry; Optical refraction; Phase measurement; Position measurement; Silicon; Volume 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.2008.4574828

Filename

4574828