Petkovsek Rok, Horvat Darja, Mocnik Grisa, Terzić Mira, Mozina Janez
Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, SI-1000 Ljubljana, Slovenia.
Ultrasonics. 2006 Dec 22;44 Suppl 1:e1255-8. doi: 10.1016/j.ultras.2006.05.078. Epub 2006 Jun 5.
We propose a method for evaluating the size of the laser-induced breakdown region in water based on the detection and analysis of optodynamic waves. The breakdown region is an optodynamic source of pressure waves that propagate into the surrounding liquid as an ultrasonic pulse. In the experiment the optical breakdown was generated by a standard ophthalmic Nd:YAG laser with a pulse duration of 10 ns and a maximum energy per pulse of 10 mJ. The pulses were detected inside the liquid with a laser-beam deflection probe. The waveforms were captured in the far-field and analyzed. The analysis provides information about the apparent size of the optodynamic source, which is directly related to the size of the breakdown region. The proposed method can be adapted for online monitoring.
我们提出了一种基于对光动力学波的检测和分析来评估水中激光诱导击穿区域大小的方法。击穿区域是压力波的光动力学源，它作为超声波脉冲传播到周围液体中。在实验中，光学击穿由标准眼科钕:钇铝石榴石激光产生，脉冲持续时间为10纳秒，每个脉冲的最大能量为10毫焦。用激光束偏转探头在液体内部检测脉冲。在远场捕获波形并进行分析。该分析提供了有关光动力学源表观大小的信息，这与击穿区域的大小直接相关。所提出的方法可适用于在线监测。
