20.500.12556/RUL-126912 Laser-light speckle formation for deflection-shape identification using digital image correlation The application of a speckle pattern to the surface of a structure is usually required for Digital Image Correlation (DIC)-based displacement identification. A speckle pattern generally requires the modification (e.g., painting) of the structure's surface. An improved method of laser-light speckle formation for DIC measurement of relatively large structures is proposed, where the speckle pattern is formed by laser-light interference as a consequence of the surface roughness and the laser illumination, leaving the surface of the object untouched. The interference phenomena caused by the light reflecting from the rough surface create bright spots that move with the observed structure. The size of the speckles depends on the surface roughness, the experimental setup and the optical system. The proposed method is researched using three experimental cases: two rigid-body motion measurements and a full-field operating-deflection-shape measurement. The experiments show that motion can be identified even when the amplitudes of the oscillation are as low as 0.1 m (on a scale of 1/1000 of a pixel). While the laser speckle accuracy is promising, it was found to be less accurate than painted speckle-pattern measurements, but with further development it could become a viable alternative. laser speckle paint speckle digital image correlation (DIC) full-field vibration identification lasersko formiran pikčast vzorec nanešen pikčast vzorec visokoločljivostna identifikacija vibracijskih oblik true false true Angleški jezik Slovenski jezik Članek v reviji 2021-05-10 11:48:55 2021-05-10 11:49:00 2025-03-14 10:40:03 0000-00-00 00:00:00 2021 0 0 Str. 1-15 art. 107899 Vol. 161 Dec. 2021 0000-00-00 PostprintKoncna Objavljeno NiDoloceno 0000-00-00 2021-03-21 2021-12-01 2023-12-01 535:004.932(045) 0888-3270 10.1016/j.ymssp.2021.107899 61853187 RAZ_Zaletelj_Klemen_2021.pdf RAZ_Zaletelj_Klemen_2021.pdf 1 01342B8BD1FD8B9EE525B1BFA419FF7D 530aed7e6bffc51a7ada2477d7a07f9effa7b2f95b1ad9d50dcdb24fcea2cfb3 069cc3fd-b176-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=143052 https://www.sciencedirect.com/science/article/pii/S0888327021002946 1 ea1da9a5-b174-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=143050 Fakulteta za strojništvo 0 0 0