Flat-surface wringing and contact error variability

Siddall, G.J.; Willey, P.C.T.

doi:10.1088/0022-3727/3/1/303

Cited by 10 publications

(10 citation statements)

References 10 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The wringing of gauge blocks has a long history. [41] During a recent Key Comparison [42], 11 laboratories wrung together pairs of gage blocks and measured the resulting lengths. The standard deviation of the repeatability of the lengths ranged from 3 to 12 nm, depending upon the laboratory.…”

Section: Dimensional Metrologymentioning

confidence: 99%

Optimizing acoustic measurements of the Boltzmann constant

Moldover

2009

Comptes Rendus. Physique

View full text Add to dashboard Cite

We review the progress in acoustic metrology of gases that has occurred since the 1988 measurement of the universal gas constant R using a spherical acoustic resonator. The advances in understanding resonators and in calculating the thermophysical properties of helium ab initio suggest that today one could determine Boltzmann's constant k B from acoustic measurements using either helium or argon with a relative uncertainty less than 10 −6 . RésuméProgrès dans la détermination de la constante de Boltzmann par voie acoustique L'article récapitule les avancées effectuées en métrologie acoustique dans les gaz depuis la mesure de la constante universelle des gaz R effectuée en 1988 en utilisant un résonateur acoustique sphérique. Des progrès substantiels ont été réalisés, tant pour mieux comprendre le fonctionnement des résonateurs acoustiques que pour calculer ab initio, avec une fiabilité accrue, les caractéristiques thermo-physiques de l'hélium. Ils permettent d'envisager désormais une détermination de la constante de Boltzmann k B par voie acoustique avec une incertitude relative meilleure que 10 -6 , en utilisant soit l'argon, soit l'hélium.________________________________ 1. Introduction.

show abstract

Section: Dimensional Metrologymentioning

confidence: 99%

Optimizing acoustic measurements of the Boltzmann constant

Moldover

2009

Comptes Rendus. Physique

View full text Add to dashboard Cite

show abstract

“…Many studies made by Siddall, some as far back as 1969 [4], investigate the error sources focusing on the wringing between the gauge block and the platen. Many thereafter [5][6][7] continue this research.…”

Section: Difficulties and Restrictions With The Calibration Of Gauge mentioning

confidence: 99%

The design of a double ended interferometer (DEI)

Krüger

Hungwe

Farid

et al. 2014

Int. J. Metrol. Qual. Eng.

View full text Add to dashboard Cite

Abstract. At NMISA the SI unit for length is realised by an iodine stabilised He-Ne laser, an optical measurement. In industry most measurements are performed by mechanical probing. Gauge blocks are the link between the optical measurements and the mechanical measurements, and are therefore critical in disseminating traceability. The gauge block length is currently determined by wringing the gauge block onto a platen. This is laborious, requires skill and causes contact errors. Since around 1943, there have been efforts to build a double ended interferometer where gauge block length can be determined without wringing it onto a platen. While there has been a lot of progress in building DEIs, to date, there is still no commercially available DEI. We present a collaboration project between the National Metrology Institute of South Africa (NMISA), the National Institute of Standards (NIS Egypt) and Stellenbosch University (SUN) in South Africa to build a double ended interferometer for use at the respective National Metrology Institutes. We investigate improvements to the interferometric calibration of gauge blocks and recent developments. The different systems currently in use in the national metrology laboratories are described and various designs are investigated. Lastly the expected outcome of the project will be discussed.

show abstract

“…When the gauge block is made of same material as platen, qG = qp , and M=G+f. (3) When the roughness of the surface of the gauge block is the same as that of platen, the length given by equation (3) is the length of gauge block defined by ISO 3650. According to Thwite's work, the wrung gauge block is contact at the peak of asperity of the gauge surface with another gauge surface or platen.…”

Section: Phase Correctionmentioning

confidence: 99%

<title>Phase correction in measurement of gauge blocks using a new double-ended interferometer</title>

Ishii¹

1998

SPIE Proceedings

View full text Add to dashboard Cite

Phase correction in measured lengths of gauge blocks was researched. It has been known that the phase correction depends on the surface roughness of the gauge and the shift of the effective plane of reflection caused by penetration, due to the complex refractive index.We compared measured lengths of gauge blocks between two methods, a new double-ended interferometer and a conventional Kösters' interferometer. The distance between two effective planes of reflection of the gauge block is measured directly using this double-ended interferometer. While the phase correction for the length of the gauge block using Kösters' interferometer depends only the surface roughness of the gauge block and the platen, if the gauge block and the platen is made of the same material. Thus the part of the phase correction that depends on the surface roughness is separated from that depends on refractive index. The surface roughness of the gauge blocks and the platens were measured using an instrument by stylus method and an atomic force microscope. As the results of the experiments, the consistency of the well-known model for phase correction was confirmed, in which the mechanical plane is determined by the tops of peaks in the profile of the gauge surface.

show abstract

Flat-surface wringing and contact error variability

Cited by 10 publications

References 10 publications

Optimizing acoustic measurements of the Boltzmann constant

Optimizing acoustic measurements of the Boltzmann constant

The design of a double ended interferometer (DEI)

<title>Phase correction in measurement of gauge blocks using a new double-ended interferometer</title>

Contact Info

Product

Resources

About