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Planck Extension for High-precision Vacuum Mass Comparators

Markus PabstThomas FröhlichFalko Hilbrunner

出版	TU Ilmenau, Universitätsbibliothek, ilmedia, 2023
URL	http://books.google.com.hk/books?id=Zu5f0AEACAAJ&hl=&source=gbs_api

註釋This paper describes a technical implementation for the realization of the kilogram according to the new definition of the International System of Units (SI) of 2019. A commercially available high-vacuum prototype mass comparator from Sartorius serves as the basis. Mass comparators were used to directly compare kilogram prototypes, such as the International Prototype of the Kilogram (IPK or R), with other kilogram prototypes to realize a calibration chain. Since the redefinition of the SI in 2019, the kilogram is defined by Planck's constant (h). The Planck extension presented here is intended to make it possible, through technical modifications and some additional components, to convert high-vacuum mass comparators so that they can calibrate kilogram prototypes and mass standards according to the new definition. In addition, this should allow the continuous calibration of mass standards up to 1 kg in accordance with the E1 standard of OIML R 111-1 (2004). At the same time, all functions of the mass comparators are retained, which makes it possible to compare measurements according to the old and the new mass definition. During this elaboration, the functional principle of the Planck extension is described. Furthermore, measurement results from initial test measurements of 100 g with a relative standard deviation of 0.68 ppm are presented, analyzed, and evaluated. Based on the experience with the first prototype Planck extension, possible improvements and future work are proposed.