The first determination of the Planck constant with the joule balance NIM-2

Li, Zhengkun; Zhang, Zhonghua; Lu, Yunfeng; Hu, Pengcheng; Liu, Yongmeng; Xu, Jinxin; Bai, Yang; Zeng, Tao; Wang, Gang; You, Qiang; Wang, Dawei; Li, Shisong; He, Qing; Tan, Jiubin

doi:10.1088/1681-7575/aa7a65

Cited by 41 publications

(30 citation statements)

References 22 publications

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“…A similar situation exists in the spread of the values of comparative uncertainties. •kg/s [25] and h min = 6.626069120•10 -34 m 2 •kg/s [28]. In this case, the possible observed range S h of h placing is equal to:…”

Section: Kbmentioning

confidence: 98%

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Progress in Reducing the Uncertainty of Measurement of Planck’s Constant in Terms of the Information Approach

Menin¹

2019

PSIJ

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Aims: The purpose of this work is to prove that only by implementing a weighted and thorough theoretical information approach to the development of a physical and mathematical model for measuring Planck’s constant, it is possible to prepare a reasonable justification for calculating the required relative uncertainty. Place and Duration of Study: Mechanical & Refrigeration Consultation Expert, between June 2018 and February 2019. Methodology: Using the principles of information theory and similarity theory, a dimensionless parameter (comparative uncertainty) was formulated to compare the experimental results of measurements of Planck’s constant and the simulated data. Results: Examples of the application of the proposed original method to measure Planck’s constant using the Kibble balance and X-ray crystal density methods are given. Conclusion: The proposed information-oriented approach is theoretically justified and does not include such concepts as a statistically significant trend, cumulative values of consensus or statistical control, which are characteristic of the statistical expert tool adopted in CODATA. We tried to show how the mathematical and, apparently, rather arbitrary expert formalism can be replaced by a simple, theoretically grounded postulate on the use of information in measurements.

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Section: Kbmentioning

confidence: 98%

“…The measurement data are summarised in Table 2. The noted scientific articles belong to CoP SI ≡ LMТI [23][24][25][26][27][28][29]. The values of absolute and relative uncertainties differ by more than a factor of 10.…”

Section: Kbmentioning

confidence: 99%

Progress in Reducing the Uncertainty of Measurement of Planck’s Constant in Terms of the Information Approach

Menin¹

2019

PSIJ

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“…The new kilogram will be realized using the Kibble balance [1], Joule balance [2] or x-ray crystal density (XRCD, Avogadro) experiments [3]. The nature of the Kibble balance, Joule balance and XRCD experiments that three methods will realize the kilogram in vacuum [4].…”

Section: Introductionmentioning

confidence: 99%

Research on Vacuum Transfer Equipment in NIM

Wang

2019

IEEE Access

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By the end of 2018, the 26th Congress of Metrology and Weights (Conférence Générale des Poids et Mesures, CGPM) had been held. A new definition of mass unit has been approved on the meeting of CGPM. Mise en pratique-kg includes the guide of dissemination after the redefinition of kilogram. The traditional dissemination of mass unit is carried out in air. The new method for dissemination from Planck constant to primary mass standard or from primary mass standard to secondary mass is implemented under vacuum. The dissemination method after the redefinition of mass unit will be changed from Planck constant to primary mass standard or from primary mass standard to secondary mass standard. The measurement of weights under vacuum will replace the measurement of weights in air. To transfer weights from vacuum vessel to vacuum mass comparator, a vacuum transfer equipment (VTE) is developed by National Institute of Metrology, China (NIM). A multistage manipulator system is designed to transfer weight under vacuum between VTE and vacuum mass comparator or Joule Balance. The experimental results show that the performance of VTE is efficient for transferring the weights under vacuum.

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“…But at the highest accuracies available today, only two methods are competitive. The Kibble balance method and its variations like the Joule balance, all rely on the Josephson and quantum Hall effects to link to the Planck constant . The X‐ray crystal density (XRCD) method measures the microscopic lattice parameter with a combined X‐ray and optical technique to “count the atoms” in a near perfect sphere of silicon .…”

Section: Introductionmentioning

confidence: 99%

The Planck Constant for the Definition and Realization of the Kilogram

Wood

Bettin

2018

Annalen der Physik

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On May 20, 2019 the values of the Planck, h, and Avogadro, N A , constants will be fixed, revising our measurement system, the International System of Units (SI), and providing a new way to get mass traceability. While the famous energy relations mc 2 and hf may remind many that the Planck constant is indeed related to mass, it is less recognized how this is also true for the Avogadro constant. These concepts are reviewed in the context of the upcoming revision of the SI. How the fixed values were chosen and how mass traceability will be maintained with the smallest uncertainty are also discussed.The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/andp.201800308 ν Cs = 9 192 631 770 Hz hyperfine transition frequency of 133 Cs c = 299 792 458 m s −1 speed of light in vacuum h = 6.626 070 15 × 10 −34 J s Planck constant e = 1.602 176 634 × 10 −19 C elementary charge k = 1.380 649 × 10 −23 J K −1 Boltzmann constant N A = 6.022 140 76 × 10 23 mol −1 Avogadro constant K cd = 683 lm W −1 luminous efficacy of 540 × 10 12 Hz radiationThe values and use of c, ν Cs , and K cd are already established within the SI and this has made the change more manageable.

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The first determination of the Planck constant with the joule balance NIM-2

Cited by 41 publications

References 22 publications

Progress in Reducing the Uncertainty of Measurement of Planck’s Constant in Terms of the Information Approach

Progress in Reducing the Uncertainty of Measurement of Planck’s Constant in Terms of the Information Approach

Research on Vacuum Transfer Equipment in NIM

The Planck Constant for the Definition and Realization of the Kilogram

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