Primarni etaloni za zagotavljanje meroslovne sledljivosti LDA merilnega sistema za hitrost tekočin

Štefe, Blaž (author), Kutin, Jože (mentor), Bobovnik, Gregor (comentor)

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.

• Language: Slovenian
• Keywords: laserska Dopplerjeva anemometrija, kalibracija LDA z vrtečim diskom, dosegljiva merilna negotovost, primarni etalon
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [B. Štefe]
• Year: 2023
• Number of pages: XII, 36 str.
• PID: 20.500.12556/RUL-149021
• UDC: 531.5:531.771:52-323.4(043.2)
• COBISS.SI-ID: 163865091
• Publication date in RUL: 02.09.2023

ŠTEFE, Blaž, 2023, Primarni etaloni za zagotavljanje meroslovne sledljivosti LDA merilnega sistema za hitrost tekočin [online]. Bachelor’s thesis. Ljubljana : B. Štefe] . [Accessed 26 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=149021

Secondary language

• Language: English
• Title: Primary standards to ensure metrological traceability of the LDA measuring system for fluid velocity

Abstract

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.

• Keywords: laser Doppler anemometry, LDA calibration with rotating disk, achievable measurement uncertainty, primary standard