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Shock-wave generation during dry laser cleaning of particles
Bregar, Vladimir Boštjan ; Možina, Janez, fizik, 1945-
Generation of shock waves during a dry laser-cleaning process was examined with the probe-beam-deflection technique. Our experimental set-up allows measurement of a density gradient and a time of ...flight of the generated optoacoustic waves. With analysis of the measured signals we observedsupersonic propagation velocities, density profiles matching the shock-wave profile, and reasonable agreement between the shock-wave theory andmeasured data. Furthermore, we inspected the mechanisms for the generation of these optoacoustic waves. For the clean surface a rapid thermoelastic surface expansion is the main generation mechanism, creating only weak shock wavesč however, during the dry laser cleaning the ejected contaminants generate relatively strong shock waves. This difference is easily observed with our experimental set-up, thus enabling the on-line monitoring of the laser-cleaning process.
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