Minimal watt balance

Ward, R.J.

doi:10.1088/0031-9120/49/3/277

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2023

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“…The basic mechanical setup using two loudspeakers was inspired by the proposal of a possible 'watt' balance based on the 'seismometer' suspension mechanism by Kibble and Robinson [6]. The electrical measurements involve some modification of the Minimal Watt Balance proposed by Professor Ward [7] with the aim of generating the voltage induced in the speaker's coil directly from the mechanical vibration of the loudspeaker in the moving phase. For this, a second loudspeaker is used as a system for driving the mechanical vibration in the first one when it is excited by alternating voltage.…”

Section: Figure 1 Si Illustrationmentioning

confidence: 99%

A simple Kibble balance approach for principle demonstration at Inmetro

Cacais,

Loayza,

Beatrici

et al. 2023

J. Phys.: Conf. Ser.

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This work shows the results obtained by Inmetro’s mass lab implementation of a simple Kibble balance approach for demonstration of its mass measurement principle based on the Planck’s constant. It is based on some modifications of Mimimal Watt Balance work reducing the required electrical measurements by using two loudspeakers mechanically coupled so that one of them acts as a linear actuator in order to perform BL measurements in the moving phase. The mean BL value obtained in weighing phase was 2.66 N/A and in moving phase 2.67 N/A. The maximum error of mass values measured for standard weights in the range from 5 g to 50 g was lower than 5%.

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Section: Figure 1 Si Illustrationmentioning

confidence: 99%