An Approach to Synchronise Effective Areas of Pressure Balances

Sabuga, Wladimir; Priruenrom, Tasanee

doi:10.1007/s12647-014-0116-y

Cited by 6 publications

(9 citation statements)

References 3 publications

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“…2014 2011 Then it is of course desirable to determine the synchronized effective areas, which are as consistent as possible both with the initial dimensional effective areas and with the cross-float ratios. A suitable synchronization method is described in [14].…”

Section: Synchronization Of Effective Areasmentioning

confidence: 99%

“…where the n × n matrix M i results from M by replacing column i with vector A d . For the Type A relative standard uncertainty of the effective area A i , u Ai = u A (A i )/A i , the following formula is given by Sabuga and Priruenrom [14]:…”

Section: Taking Into Account That the Term (Amentioning

confidence: 99%

“…The formulas for the Type B relative standard uncertainty u Bi = u B (A i )/A i of the effective area A i result directly from equation ( 4) applying the law of propagation of uncertainty. They are presented in [14] (equations ( 9) to ( 14)). For obtaining a maximum estimate, the formula for correlated data has to be used.…”

Section: Taking Into Account That the Term (Amentioning

confidence: 99%

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Measurement of pressures up to 7 MPa applying pressure balances for dielectric-constant gas thermometry

Zandt¹,

Sabuga²,

Gaiser³

et al. 2015

Metrologia

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For the determination of the Boltzmann constant by dielectric-constant gas thermometry, the uncertainty of pressure measurements in helium up to 7 MPa has been decreased compared with previous achievements (Sabuga 2011 PTB-Mitt. 121 247-55). This was possible by performing comprehensive cross-float experiments with a system of six special pressure balances and the synchronization of their effective areas. It is now possible to measure a helium pressure of 7 MPa with a relative standard uncertainty of 1.0 ppm applying a 2 cm 2 piston-cylinder unit, the calibration of which is traceable to the SI base units.

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Section: Synchronization Of Effective Areasmentioning

confidence: 99%

Section: Taking Into Account That the Term (Amentioning

confidence: 99%

Section: Taking Into Account That the Term (Amentioning

confidence: 99%

See 1 more Smart Citation

Measurement of pressures up to 7 MPa applying pressure balances for dielectric-constant gas thermometry

Zandt¹,

Sabuga²,

Gaiser³

et al. 2015

Metrologia

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show abstract

“…While the pressure more than 50 MPa, the main uncertainty contribution of the pressure measurement becomes to . Therefore, the controlled-clearance piston gauge (CCPG) is widely used as the primary standard in many NMIs [1,2,3] for high pressure scale in order to realize and optimize the uncertainty estimation of  The pressure laboratory of National Institute of Metrology (Thailand), NIMT started to establish the gas primary pressure standards from 1.5 to 350 kPa since 2012 by using the dimensional properties to determine A0 [4]. Then the pressure standard obtained from the dimensional measurement were initially used to determine the effective area at zero pressure (A0) up to pressure 500 MPa by using the crossfloating method.…”

Section: Introductionmentioning

confidence: 99%

ESTABLISHMENT OF THAILAND PRESSURE STANDARD FROM 1.5 kPa TO 500 Mpa

Wongthep¹,

Sainoo²

2023

Proceedings of the 6th IMEKO TC16 Conference on Pressure and Vacuum Measurement

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This paper describes the method used to characterize the zero-pressure effective area (A0) and pressure distortion coefficient () of 200MPa-CCPG oil piston-cylinder unit (PCU) in order to realize the national pressure scale from 1.5 kPa to 500 MPa. The A0 was determined by cross-floating method from a set of primary gas pressure standard, while the H-W method was used for calculating . A set of three oil PCUs was maintained as a primary pressure standard and used for scaling up and down pressure to determine  for the other PCUs. The relative standard uncertainty of 200MPa-CCPG pressure standard is 3.010 -5 .

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“…There are some available methods, however they were developed to match only the form profiles without taking into account the diameters [10,11]. Sabuga et al managed this task manually until an approach based on the least squares method was developed [12]. However, they did not use all available information content of the data.…”

Section: Introductionmentioning

confidence: 99%

Hybrid data fusion strategy for the low-uncertainty 3D calibration of cylinder standards

Liu

Jusko

Tutsch

2017

Meas. Sci. Technol.

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A hybrid data fusion strategy which has been developed to fuse the form and diameter data acquired in the low-uncertainty calibration of cylinder standard is presented. It consists of two Gaussian process models and one least squares model. It is intrinsically robust and, as such, not sensitive to outliers and data randomness. The fused data points reconstruct the 3D cylinder form and the estimated parameters are used for profile transformation. The transformed profiles can be applied to other calculations. Simulations were conducted to test the data fusion performances. The results showed that the data fusion error was as low as 20% of the measurement uncertainty. The data fusion process largely reduced the uncertainty of data, namely, the uncertainty of the fused data was only 20% to that of the raw data. Experiments were performed by applying the data fusion strategy to the calibration of a piston gauge standard. The data fusion results showed good agreement with the specified tolerances, which indirectly verified the good quality of the measurement. The hybrid data fusion strategy is suitable for generalized calibration of cylinder standards and each step of it can also be applied independently to the data fusion of roundness profiles with diameters or with straightness profiles.

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An Approach to Synchronise Effective Areas of Pressure Balances

Cited by 6 publications

References 3 publications

Measurement of pressures up to 7 MPa applying pressure balances for dielectric-constant gas thermometry

Measurement of pressures up to 7 MPa applying pressure balances for dielectric-constant gas thermometry

ESTABLISHMENT OF THAILAND PRESSURE STANDARD FROM 1.5 kPa TO 500 Mpa

Hybrid data fusion strategy for the low-uncertainty 3D calibration of cylinder standards

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