Faculty of Mechanical Engineering, Lj. (FSLJ)
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Ojačenje optodinamsko generiranih tlačnih valov globoko pod obsevano površino : doktorsko deloTašič Muc, BlažV doktorskem delu smo raziskali metodo laserskega generiranja lokaliziranih tlačnih motenj globoko pod obsevano površino in tvorbo kavitacije. Eksperimentalni sistem je sestavljen iz laserskega vira ... Nd:YAG s preklopom kvalitete, ki omogoča generiranje večjega števila nanosekundnih bliskov do energije 900 mJ, ki si sledijo v intervalu med 50 μs in 400 μs. Z uporabo sferično oblikovane optoakustične leče, ki je izdelana iz titana s površinskim slojem črnega TiOx, smo tvorili tlačne motnje, katerih velikost v gorišču znaša približno 120 x 300 μm2 (dolžine x premer), amplituda tlačne motnje pa znaša ~100 MPa. S schlieren fotografijo in hitro kamero smo pokazali, da je možno doseči lokalizirano kavitacijo v gorišču optoakustične leče. Velikost kavitacijskega oblaka in njegovo nihanje v času narašča monotono z energijo laserskega vzbujanja. V primeru uporabe štirih zaporednih laserskih bliskov, ko je zamik med laserskimi bliski enak trajanju parnih mehurčkov nad optoakustično lečo, se velikost kavitacije poveča za 10-krat, medtem ko se amplituda tlačnega vala poviša za več kot 75 %. Na to ojačenje odločilno vplivajo trije medsebojno konkurenčni pojavi: zastiranje laserskega bliska zaradi prisotnosti oblaka parnih mehurčkov, povečanje temperature površine OL in resonančni učinek, ki se pojavi, kadar je naslednji laserski blisk sprožen ob kolapsu oblaka parnih mehurčkov. Doseženi rezultati so dobra osnova za prihodnji razvoj novih minimalno invazivnih medicinskih posegov, kjer je potrebno vplivati na tkivo globoko pod površjem kože (več mm), ki ga s svetlobo ni možno neposredno osvetliti.Type of material - dissertation ; adult, seriousPublication and manufacture - Ljubljana : [B. Tašič Muc], 2024Language - slovenianCOBISS.SI-ID - 195661827
Author
Tašič Muc, Blaž
Other authors
Jezeršek, Matija
Topics
disertacije |
laserji |
optoakustična leča |
kavitacija |
ablacija |
optodinamika |
dissertations |
lasers |
optoacoustic lens |
cavitation |
ablation |
optodynamics
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Dr TAŠIČ MUC B. Ojačenje IN: 00061588 Dr TAŠIČ MUC B. Ojačenje IN: 00061588 |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Tašič Muc, Blaž | 39666 |
Jezeršek, Matija | 21238 |
Source: Personal bibliographies
and: SICRIS
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