Optical Measurement of a Laser Induced Micro Shock Wave on a Metal Surface

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概要

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• Laser induced streaming is one of the interesting phenomena. When we provide a highly concentrated energy in a small region with laser beam, an induced streaming, such as micro shock wave or laser induced thermal acoustics is observed in the region. In the present paper, a micro shock wave in air which was induced by laser irradiation was observed by the optical techniques. The shock wave was generated on the metal surface due to the laser ablation. In the present experiment, we focused on a relatively low irradiation intensity region. As the laser power decreased, the plasma plume was not observed clearly on the metal target, but a strong micro shock was still induced. The trajectory of shock front was recorded with the shadowgraphic measurement and the Mach number was calculated experimentally. Alternatively, the induced density behind the shock wave was measured by speckle photographic technique. The shock Mach number and density distribution was analyzed and discussed with self-similar theory.

• 一般社団法人 日本機械学会の論文

著者

• Hirahara Hiroyuki

  Graduate School Of Engineering Sciences Kyushu University

• HIRAHARA Hiroyuki

  Graduate School of Science and Engineering, Saitama University

• KAWAHASHI Masaaki

  Graduate School of Science and Engineering, Saitama University

• FUJINAMI Masaru

  Graduate School of Science and Engineering, Saitama University

関連論文

• Investigations of Mach Reflection of a Shock Wave : 4th Report, The Transition between Regular and Mach Reflections
• Investigations of Mach Reflection of a Shock Wave : 3rd Report, Strength of a Reflected Shock Wave
• Investigations of Mach Reflection of a Shock Wave : 2nd Report, Shape of a Reflected Shock Wave
• Optical Measurement of a Laser Induced Micro Shock Wave on a Metal Surface

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