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

• Autorzy: Juha Saarela , Torbjörn Löfqvist , Kerstin Ramser , Per Gren , Erik Olson , Jan Niemi , Mikael Sjödahl
• 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

EN

dielectric breakdown; laser; vibrometer; optoacoustic; surface wave

• Czasopismo: Open Physics
• Rocznik: 2010
• Tom: 8
• Numer: 2
• Strony: 235-241

Daty

wydano

2010-04-01

online

2010-01-30

Twórcy

autor

Juha Saarela

• Department of Electrical and Information Engineering and Infotech Oulu, University of Oulu, P.O. Box 4500, 90014, University of Oulu, Finland,

autor

Torbjörn Löfqvist

• Department of Computer Science and Electrical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden

autor

Kerstin Ramser

• Department of Computer Science and Electrical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden

autor

Per Gren

• Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden

autor

Erik Olson

• Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden

autor

Jan Niemi

• Department of Computer Science and Electrical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden

autor

Mikael Sjödahl

• Department of Applied Physics and Mechanical Engineering, Luleå University of Technology, SE-97187, Luleå, Sweden

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Identyfikatory

DOI

10.2478/s11534-009-0122-9