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2010 | 8 | 2 | 235-241
Tytuł artykułu

Detection of laser induced dielectric breakdown in water using a laser doppler vibrometer

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
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 (OA) source. The optoacoustic effect in this case was 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 λ = 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
Słowa kluczowe
Wydawca

Czasopismo
Rocznik
Tom
8
Numer
2
Strony
235-241
Opis fizyczny
Daty
wydano
2010-04-01
online
2010-01-30
Twórcy
autor
  • Department of Electrical and Information Engineering and Infotech Oulu, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland, juha.saarela@oulu.fi
  • Department of Computer Science and Electrical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden
  • Department of Computer Science and Electrical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden
autor
  • Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden
autor
  • Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden
autor
  • Department of Computer Science and Electrical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden
  • Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden
Bibliografia
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Typ dokumentu
Bibliografia
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Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11534-009-0122-9
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