20.500.12556/RUL-149021 Primarni etaloni za zagotavljanje meroslovne sledljivosti LDA merilnega sistema za hitrost tekočin Primary standards to ensure metrological traceability of the LDA measuring system for fluid velocity Laserski Dopplerjev anemometer (LDA) uporabljamo kot referenčni etalon za merjenje hitrosti tekočin. Da zagotovimo sledljivost meritev, moramo sistem ustrezno umeriti. Za umerjanje LDA merilnikov različni svetovni meroslovni instituti uporabljajo t.i. vrteči disk. V nalogi smo preko pregleda literature predstavili osnovne principe delovanja obstoječih etalonskih sistemov in izpostavili ključne vplivne veličine na njihovo merilno negotovost. Na podlagi tega smo naredili kriterije načrtovanja lastne izvedbe primarnega etalona za umerjanje LDA merilnika. Predstavili smo rezultate ključnih vplivnih veličin na merilno negotovost. Za vsak primer smo s pomočjo primerjalne analize izpostavili vplivne veličine, ki vplivajo na negotovost obodne hitrosti diska in jih medsebojno primerjali. Prikazali smo smernice za izdelavo lastnega etalonskega sistema z vrtečim diskom. Laser Doppler Anemometer (LDA) is used as a reference standard for measuring the velocity of liquids. To ensure measurement traceability, the system must be properly calibrated. Many international metrology institutes use a rotating disk for calibrating LDA measurement system. In this study, we presented the basic working principles of existing standard systems and highlighted key influential variables on their measurement uncertainty through a review of the literature. Based on this, we established criteria for designing our own implementation of a primary standard for calibrating LDA instruments. We presented the results of key influential variables on measuremnt uncertainty. For each case, we used comparative analysis to indentify influential variables affecting the uncertainty of the disk's circumferential velocity and compared them. We provided guidelines for creating our own standard system with rotating disk. laserska Dopplerjeva anemometrija kalibracija LDA z vrtečim diskom dosegljiva merilna negotovost primarni etalon laser Doppler anemometry LDA calibration with rotating disk achievable measurement uncertainty primary standard true false false [B. Štefe] Slovenski jezik Angleški jezik Zaključna naloga 2023-09-02 08:33:46 2023-09-02 08:33:46 2023-11-03 12:56:23 0000-00-00 00:00:00 2023 0 Ljubljana 0 XII, 36 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 531.5:531.771:52-323.4(043.2) 255677 163865091 29779.pdf 29779.pdf 1 0C0767ACF8029AAB4D06BDE9EB61ED6A 0ada20080e62179686190805cb31372ff2a00d2af327b89072d822b43b5cebfb aa278fbf-495a-11ee-af86-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=173403 Fakulteta za strojništvo 0 0 0