| Issue |
Int. J. Metrol. Qual. Eng.
Volume 6, Number 2, 2015
|
|
|---|---|---|
| Article Number | 203 | |
| Number of page(s) | 3 | |
| DOI | https://doi.org/10.1051/ijmqe/2015010 | |
| Published online | 26 August 2015 | |
SI physiological units
1 IPQ – Instituto Português da
Qualidade, Rua António Gião,
2, 2825-513
Caparica,
Portugal
2 IST – Instituto Superior Técnico,
Universidade de Lisboa Estrada Nacional 10 (km 139.7), 2695-066
Bobadela LRS,
Portugal
⋆ Correspondence:
opellegrino@ipq.pt
Received:
1
December
2014
Accepted:
2
February
2015
One of the seven base units of the International System of Units (SI), the candela, which is the unit of the luminous intensity, and its derived units are physiological units. The effect of the optical radiation on human beings is taken into account by introducing a weighting factor, the luminous efficiency, to the definition of radiant quantity of interest. Some SI physiological units are frequently used in other metrological domains, such as ionizing radiation, photochemical and biological activities, acoustics and photobiology. This communication is intended to present some principles underlying the definitions of physiological quantities and units associated to these metrological fields.
Key words: Physiological units / luminous intensity / illuminance / ionizing radiation / photochemical units / photobiological units / physiological acoustical units / biological activity of substances
© EDP Sciences 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.