Aperture correction for a sphere interferometer

Autor:	R Arnold Nicolaus, Gerhard Bönsch
Rok vydání:	2009
Předmět:	Physics Silicon Aperture business.industry General Engineering chemistry.chemical_element Collimated light Interferometry symbols.namesake Superposition principle Optics chemistry Avogadro constant symbols Pinhole (optics) SPHERES business
Zdroj:	Metrologia. 46:668-673
ISSN:	1681-7575 0026-1394
DOI:	10.1088/0026-1394/46/6/009
Popis:	Considerations have been made to derive a correction for the diameter measurements of a sphere by means of a special sphere interferometer. This correction is caused by the finite diameter of the light source acting as the entrance 'pinhole' aperture in the light collimating system. The finite diameter has the effect that the wave which is incident on the sphere is a superposition of spherical waves which are slightly inclined with respect to each other. The resulting correction is essential for high accuracy dimensional measurements of silicon spheres to determine the Avogadro constant—a new determination of which is a contribution to a new definition of the kilogram.
Databáze:	OpenAIRE
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