Zobrazeno 1 - 10
of 24
pro vyhledávání: '"R. A. Nicolaus"'
Autor:
R Arnold Nicolaus, Gerhard Bönsch
Publikováno v:
Metrologia. 46:668-673
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
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::554643d1313f82bbc9220f1e69820c05
https://doi.org/10.1088/0026-1394/46/6/009
https://doi.org/10.1088/0026-1394/46/6/009
Autor:
Kenichi Fujii, R A Nicolaus
Publikováno v:
Measurement Science and Technology. 17:2527-2539
For direct density determination by so-called absolute procedures, the mass and the volume of a body must be determined. The paper gives an overview of dimensional measurements of silicon spheres used as density standards. Relative uncertainties for
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::71e927587761652ac2657ceba374eb61
https://doi.org/10.1088/0957-0233/17/10/001
https://doi.org/10.1088/0957-0233/17/10/001
Autor:
G Bönsch, R A Nicolaus
Publikováno v:
Metrologia. 42:24-31
For an absolute measurement of a density standard, mass and volume are measured separately. The absolute determination of the volume is still the quantity limiting the uncertainty. Lowest uncertainties are achieved by interferometric measurements of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::49bd08515f6808be6726471af623801b
https://doi.org/10.1088/0026-1394/42/1/003
https://doi.org/10.1088/0026-1394/42/1/003
Autor:
R. Arnold Nicolaus
Publikováno v:
Fringe 2013 ISBN: 9783642363580
Metrology is the science of measurement and its application. Whenever one performs a measurement one compares the measurand to an appropriate unit. The number of these units has changed since the metre convention in 1875 to 1960 when the 11th CGPM (C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6aebff81bb1096c8072589757a12710
https://doi.org/10.1007/978-3-642-36359-7_76
https://doi.org/10.1007/978-3-642-36359-7_76
Publikováno v:
Fringe 2013 ISBN: 9783642363580
Fundamental for a further decrease of the measurement uncertainty of the Avogadro constant determination is to gain more information on how optical imperfections of the system influence the measurement results of the diameter determination of the Avo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::81402f83dc3c7b3e56273e6d245270c8
https://doi.org/10.1007/978-3-642-36359-7_159
https://doi.org/10.1007/978-3-642-36359-7_159
Autor:
G Bartl, R A Nicolaus
Publikováno v:
Surface Topography: Metrology and Properties. 4:034007
Interferometry with spherical wavefronts is usually used for characterizing precise optics. A special spherical interferometer was set up to measure the volume of high precision spheres used for the new definition of the SI unit kilogram, for which a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c0c71f1c4db850ef613eb3fd7c46e5d
https://doi.org/10.1088/2051-672x/4/3/034007
https://doi.org/10.1088/2051-672x/4/3/034007
Autor:
Guido Bartl, Ulrich Kuetgens, I. Busch, Michael Borys, Rolf Krüger-Sehm, R. A. Nicolaus, Michael Krumrey, Horst Bettin
Publikováno v:
2012 Conference on Precision electromagnetic Measurements.
The initial determination of Avogadro's constant based on measurements of 28Si material ended up with an overall uncertainty of 3×10−8. The results were clouded by an unexpected effect: the surface of both silicon spheres were contaminated by smal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f320cd3efe06ed4c6400242d50192ba2
https://doi.org/10.1109/cpem.2012.6251008
https://doi.org/10.1109/cpem.2012.6251008
Autor:
R. Arnold Nicolaus
Publikováno v:
Applied optics. 32(31)
Fizeau phase-stepping interferometry permits multiple-beam interferences to be evaluated exactly with a resolution in the subnanometer range when a special four-bucket algorithm is applied. The step width, which is set at 2π/4 for the four-bucket al
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::70fb3706beaca0b8c4cc96e79403bec3
https://pubmed.ncbi.nlm.nih.gov/20856475
https://pubmed.ncbi.nlm.nih.gov/20856475
Autor:
G. Bonsch, R. A. Nicolaus
Publikováno v:
IEEE Transactions on Instrumentation and Measurement. 46:563-565
In order to accurately determine Avogadro's constant, N/sub A/, the volume of a nearly perfect single-crystal silicon sphere of 1 kg mass and about 90 mm diameter is to be measured with a relative uncertainty less than 10/sup -7/. For this purpose,a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1bd578ff5585990ab279131a1bc7db34
https://doi.org/10.1109/19.571915
https://doi.org/10.1109/19.571915
Publikováno v:
SPIE Proceedings.
Double-ended Fizzeau type interferometers can be applied advantageously for direct dimensional measurements of regular bodies with parallel, flat measuring surfaces. At PTB, such an interferometer with specific equipment for phase stepping interferom
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7460cbe01583f3eecf7abb49ae3a2daa
https://doi.org/10.1117/12.323098
https://doi.org/10.1117/12.323098