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Proceedings Paper

Modelling laser interferometers for the measurement of the Avogadro constant
Author(s): Birk Andreas; Giovanni Mana; Enrico Massa; Carlo Palmisano
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Paper Abstract

In dimensional measurements by laser interferometry, when the accuracy approaches 10-9 λ, wavefront aberra­ tions cause systematic variations of the fringe period. This paper illustrates how these effects are modeled and experimentally studied in the measurements of the lattice parameter and the topographical survey of 1 kg Si spheres, which measurements are necessary to "count" atoms and to make it possible to realize the kilogram from the Planck constant value.

Paper Details

Date Published: 13 May 2013
PDF: 12 pages
Proc. SPIE 8789, Modeling Aspects in Optical Metrology IV, 87890W (13 May 2013); doi: 10.1117/12.2020282
Show Author Affiliations
Birk Andreas, Physikalisch-Technische Bundesanstalt (Germany)
Giovanni Mana, Istituto Nazionale di Ricerca Metrologica (Italy)
Enrico Massa, Istituto Nazionale di Ricerca Metrologica (Italy)
Carlo Palmisano, Univ. di Torino (Italy)

Published in SPIE Proceedings Vol. 8789:
Modeling Aspects in Optical Metrology IV
Bernd Bodermann; Karsten Frenner; Richard M. Silver, Editor(s)

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