Articles | Volume 13, issue 1
https://doi.org/10.5194/jsss-13-25-2024
https://doi.org/10.5194/jsss-13-25-2024
Feature article
 | 
26 Feb 2024
Feature article |  | 26 Feb 2024

On non-SI units accepted for use with the SI in a digital system of units

Joaquín Valdés

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Towards exclusive use of SI units in sensor systems
Joaquín Valdés and Héctor Manuel Laiz
J. Sens. Sens. Syst., 15, 23–26, https://doi.org/10.5194/jsss-15-23-2026,https://doi.org/10.5194/jsss-15-23-2026, 2026
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Cited articles

BIPM: The International System of Units (SI), Bureau International des Poids et Mesures, 9th edn., V2.01, updated December 2022, ISBN 978-92-822-2272-0, https://bipm.org/en/publications/sibrochure (last access: February 2024), 2019.​​​​​​​ 
Cladé, P., Biraben, F., Julien, L., Nez, F., and Guellati-Khelifa, S.: Precise determination of the ratio h/mu: a way to link microscopic mass to the new kilogram, Metrologia, 53, A75–A82, https://doi.org/10.1088/0026-1394/53/5/A75, 2016. 
Emerson, W. H.: One as a “unit” in expressing the magnitudes of quantities, Metrologia, 41, L26, https://doi.org/10.1088/0026-1394/41/4/L03, 2004.​​​​​​​ 
Hutzschenreuter, D., Härtig, F., Heeren, W., Wiedenhöfer, T., Forbes, A., Brown, C., Smith, I., Rhodes, S., Linkeová, I., Sýkora, J., Zelený, V., Ačko, B., Klobučar, R., Nikander, P., Elo, T., Mustapää, T., Kuosmanen, P., Maennel, O., Hovhannisyan, K., and Paciello, V.: SmartCom Digital System of Units (D-SI), Guide for the use of the metadata-format used in metrology for the easy-to-use, safe, harmonised and unambiguous digital transfer of metrological data (D-SI 1.3), Zenodo, https://doi.org/10.5281/zenodo.3522631, 2019. 
Johansson, I.: Metrological thinking needs the notions of parametric quantities, units and dimensions, Metrologia, 47, 219, https://doi.org/10.1088/0026-1394/47/3/012, 2010. 
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Short summary
There is a need to develop an unambiguous digital version of the International System of Units (SI), as required for information systems and distributed sensor networks. The unit kilogram could already replace the non-SI unit for atomic masses (dalton, Da) because the experimental uncertainties are now very close. But changing the current status of the well-known unit decibel would require considerably more time, until a digital version of a Unique SI Reference Point would be approved.
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