Detection of laser induced dielectric breakdown in water using a laser doppler vibrometer [Elektronisk resurs]
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Saarela, Juha (författare)
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Löfqvist, Torbjörn (författare)
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Gren, Per (författare)
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Ramser, Kerstin (författare)
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Olsson, Erik (författare)
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Sjödahl, Mikael (författare)
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Luleå tekniska universitet Institutionen för system- och rymdteknik (utgivare)
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Luleå tekniska universitet Institutionen för teknikvetenskap och matematik (utgivare)
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Luleå tekniska universitet Institutionen för system- och rymdteknik (utgivare)
- 2010
- Engelska.
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Ingår i: Central European Journal of Physics. - 1895-1082. ; 8:2, 235-241
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- This study is focused on exploring the feasibility of an all-optic surface scanning method in determining the size and position of a submerged, laser generated, optoacoustic source. The optoacoustic effect was here generated when the absorption of a short electromagnetic pulse in matter caused a dielectric breakdown, a plasma emission flash and a subsequent acoustic wave. In the experiment, a laser pulse with l = 1064 nm and 12 ns pulse length was aimed at a volume of deionized water. When the laser beam was focused by a f = 16 mm lens, a single dielectric breakdown spot occurred. When a f = 40 mm was used several breakdowns in a row were induced. The breakdowns were photographed using a double shutter camera. The acoustic wave generated by the dielectric breakdowns were detected at a point on the water surface using a laser Doppler vibrometer (LDV). First, the LDV signal was used to calculate the speed of sound with an accuracy of 10 m/s. Secondly, the location and length of the dielectric breakdown was calculated with an accuracy of 1 mm. The calculated position matched the breakdown location recorded by a camera. The results show that it is possible to use LDV surface measurements from a single spot to determine both the position and length of the OA source as well as the speed of sound in the medium. Furthermore, the LDV measurements also show a secondary peak that originates from the OA source. To unravel the origin and properties of this interesting feature, further investigations are necessary.
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