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Statements

Subject Item
n2:RIV%2F00025615%3A_____%2F13%3A%230001948%21RIV14-MSM-00025615
rdf:type
skos:Concept n15:Vysledek
rdfs:seeAlso
http://iopscience.iop.org/0026-1394/50/5/452
dcterms:description
It has been recommended that the relative standard uncertainty of the numerical value of the Planck constant required for the redefinition of the kilogram should not exceed 2E-8. To reach this goal using experiments based on a watt balance, the free-fall acceleration (g) traceable to the SI, at a given point and a given time, needs to be known with a sufficiently small uncertainty well below 2E-8. Reducing the uncertainty in g allows the other uncertainties related to the watt balance to be increased. Instead of a simultaneous operation of an absolute gravimeter with a watt balance, we propose an alternative approach and demonstrate that a standard uncertainty below 5 microGal (relative uncertainty of 5E-9) is reachable under the conditions at BIPM. In our approach we combine the following information: (1) the Key Comparison Reference Values obtained from the CCM.G-K1, a key comparison carried out in the frame of the International Comparison of Absolute Gravimeters in 2009 (ICAG2009); (2) the accurate gravity network established using the qualified absolute and relative gravimeters; (3) temporal gravity variations based on observed Earth-tide parameters and modelled effects of polar motion and atmospheric mass redistribution; (4) uncertainty estimates that account for non-modelled effects; (5) the option to carry out absolute gravity measurements once every one or two years with two or more gravimeters for monitoring the stability of the gravity field at the BIPM. It has been recommended that the relative standard uncertainty of the numerical value of the Planck constant required for the redefinition of the kilogram should not exceed 2E-8. To reach this goal using experiments based on a watt balance, the free-fall acceleration (g) traceable to the SI, at a given point and a given time, needs to be known with a sufficiently small uncertainty well below 2E-8. Reducing the uncertainty in g allows the other uncertainties related to the watt balance to be increased. Instead of a simultaneous operation of an absolute gravimeter with a watt balance, we propose an alternative approach and demonstrate that a standard uncertainty below 5 microGal (relative uncertainty of 5E-9) is reachable under the conditions at BIPM. In our approach we combine the following information: (1) the Key Comparison Reference Values obtained from the CCM.G-K1, a key comparison carried out in the frame of the International Comparison of Absolute Gravimeters in 2009 (ICAG2009); (2) the accurate gravity network established using the qualified absolute and relative gravimeters; (3) temporal gravity variations based on observed Earth-tide parameters and modelled effects of polar motion and atmospheric mass redistribution; (4) uncertainty estimates that account for non-modelled effects; (5) the option to carry out absolute gravity measurements once every one or two years with two or more gravimeters for monitoring the stability of the gravity field at the BIPM.
dcterms:title
On the gravimetric contribution to watt balance experiments On the gravimetric contribution to watt balance experiments
skos:prefLabel
On the gravimetric contribution to watt balance experiments On the gravimetric contribution to watt balance experiments
skos:notation
RIV/00025615:_____/13:#0001948!RIV14-MSM-00025615
n15:predkladatel
n16:ico%3A00025615
n3:aktivita
n17:P n17:I
n3:aktivity
I, P(ED1.1.00/02.0090)
n3:cisloPeriodika
5
n3:dodaniDat
n8:2014
n3:domaciTvurceVysledku
n13:1835785
n3:druhVysledku
n18:J
n3:duvernostUdaju
n19:S
n3:entitaPredkladatele
n20:predkladatel
n3:idSjednocenehoVysledku
93884
n3:idVysledku
RIV/00025615:_____/13:#0001948
n3:jazykVysledku
n12:eng
n3:klicovaSlova
gravity acceleration; free-fall acceleration; gravimeter; watt balance; kilogram
n3:klicoveSlovo
n9:gravimeter n9:kilogram n9:gravity%20acceleration n9:free-fall%20acceleration n9:watt%20balance
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[1B3C80F0901D]
n3:nazevZdroje
Metrologia
n3:obor
n14:DE
n3:pocetDomacichTvurcuVysledku
1
n3:pocetTvurcuVysledku
13
n3:projekt
n6:ED1.1.00%2F02.0090
n3:rokUplatneniVysledku
n8:2013
n3:svazekPeriodika
50
n3:tvurceVysledku
Jiang, Zhiheng Pálinkáš, Vojtěch
n3:wos
000330831400005
s:issn
0026-1394
s:numberOfPages
20
n11:doi
10.1088/0026-1394/50/5/452