Diameter comparison of a silicon sphere for the International Avogadro Coordination project

Author

Kuramoto, N. ; Fujii, K. ; Nicolaus, A. ; Bartl, G. ; Gray, M. ; Manson, P. ; Giardini, W.

Author_Institution

Nat. Metrol. Inst. of Japan (NMIJ), AIST Tsukuba Central 3, Tsukuba, Japan

fYear

2010

fDate

13-18 June 2010

Firstpage

127

Lastpage

128

Abstract

In the International Avogadro Coordination (IAC) Project using the x-ray crystal density method, volume measurements of silicon spheres by optical interferometry play a crucial role for the density measurement of the ²⁸Si enriched crystal. To confirm the reliability of the volume measurement, specified diameters of a silicon sphere were measured independently by optical interferometers at PTB (Germany), NMIA (Australia) and NMIJ (Japan). The sphere was washed before the measurement with the same procedure. The directions of the diameters were identified with reference marks prepared on the surface of the sphere. Details on the comparison results are presented.

Keywords

density measurement; diameter measurement; light interferometers; volume measurement; density measurement; diameter direction comparison; international Avogadro coordination project; optical interferometry; silicon sphere surface; volume measurement; x-ray crystal density method; Australia; Diode lasers; Frequency; Metrology; Optical interferometry; Phase shifting interferometry; Pollution measurement; Silicon; Temperature measurement; Volume measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Precision Electromagnetic Measurements (CPEM), 2010 Conference on

Conference_Location

Daejeon

Print_ISBN

978-1-4244-6795-2

Type

conf

DOI

10.1109/CPEM.2010.5544274

Filename

5544274