nähtuse või aine lahutumatul taasesitataval omadusel põhinev etalon
Good to know
Olemusliku etaloniga reprodutseeritava mõõtesuuruse väärtus omistatakse konsensuse alusel ega vaja seost mingi teise sama tüüpi etaloniga ja selle mõõtemääramatus määratakse, vaadeldes kahte komponenti: esimene on seotud mõõtesuuruse leppeväärtusega ja teine on seotud etaloni ehituse, kasutamise ja säilitamisega.
measurement standard based on an inherent and reproducible property of a phenomenon or substance
Good to know
Quantity value of an intrinsic measurement standard is assigned by consensus and does not need to be established by relating it to another measurement standard of the same type, and its measurement uncertainty is determined by considering two components: the first associated with its consensus quantity value and the second associated with its construction, implementation, and maintenance.
Olemusliku etaloni näideteks on: vee kolmikpunkti rakk kui termodünaamilise temperatuuri olemuslik etalon, olemuslik elektrilise pinge etalon Josephsoni efekti baasil, olemuslik elektrilise takistuse etalon Halli kvantefekti baasil ja olemuslik elektrilise juhtivuse etalon vasest näidisobjekti kujul.
Good to know
Olemuslik etalon koosneb tavaliselt konsensusprotseduuri nõuete kohaselt valmistatud süsteemist ja selle nõuetele vastavust kontrollitakse perioodiliselt ning võib sisaldada kasutamisest tingitud parandite rakendamise sätteid. Kvantnähtustel põhinevad olemuslikud etalonid on tavaliselt silmapaistvalt hea stabiilsusega, kusjuures täiend “olemuslik” ei tähenda, et seda etaloni saaks rakendada ja kasutada erilise hooleta või et see etalon ei oleks tundlik sisemiste ja väliste mõjude suhtes.
Triple-point-of-water cell as an intrinsic measurement standard of thermodynamic temperature. Intrinsic measurement standard of electric potential difference based on the Josephson effect. Intrinsic measurement standard of electric resistance based on the quantum Hall effect. Sample of copper as an intrinsic measurement standard of electric conductivity.
Good to know
An intrinsic measurement standard usually consists of a system produced according to the requirements of a consensus procedure and subject to periodic verification. The consensus procedure may contain provisions for the application of corrections necessitated by the implementation. Intrinsic measurement standards that are based on quantum phenomena usually have outstanding stability. The adjective “intrinsic” does not mean that such a measurement standard may be implemented and used without special care or that such a measurement standard is immune to internal and external influences.
