20.500.12556/RUL-170966 Analiza pegavosti pri laserskem osvetljevanju kavitacijskih pojavov Speckle analysis in laser illumination of cavitation phenomena Hitro spreminjajoče se pojave, kot so udarni valovi pri lasersko povzročeni kavitaciji, je težje opazovati, zato potrebujemo posebne napredne osvetlitvene sisteme, ki so sposobni ustvariti kratke laserske pulze trajanja nekaj nanosekund. Zaradi teh pa pogosto pride do pegastega vzorca na sliki, kar je posledica interference svetlobe, s katero osvetljujemo. V okviru naloge smo naredili digitalno analizo slik in določili kontrast pegavosti, ki je posledica stopnje koherence osvetlitve. Ugotovili smo, da na izračun kontrasta vpliva ozadje in opravili tudi zaznavo udarnega vala s pomočjo bilateralnega filtriranja. Rapidly changing phenomena, such as shock waves in laser-induced cavitation, are more difficult to observe, so we need special advanced illumination systems that are capable of generating short laser pulses lasting a few nanoseconds. These often result in a speckled pattern in the image, which is a consequence of the interference of the light with which we illuminate. As part of the task, we performed a digital analysis of the images and determined the speckle contrast, which is a consequence of the degree of coherence of the illumination. We found that the calculation of the contrast is affected by the background and also performed shock wave detection using bilateral filtering. pegavost lasersko osvetljevanje kavitacija kontrast pegavosti Gaussovo filtriranje bilateralno filtriranje speckle laser illumination cavitation speckle contrast Gaussian filtering bilateral filtering true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-07-24 07:30:07 2025-07-24 07:30:11 2025-08-01 14:15:00 0000-00-00 00:00:00 2025 0 0 XII, 31 f. 2025 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.375.826:532.528(043.2) 271884 244623107 39516.pdf 39516.pdf 1 A6D034F2A50826DFEFAA9EBCAF35B4B6 e3b2416dc27ee769de050aa5d949d631d3e0e6f6d0034893c2204c155834a812 402f7eae-684f-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=213269 Fakulteta za strojništvo 0 0 0