Quantitative visualization of the laser induced plume behavior using quasi-heterodyne holographic interferometry

✍ Scribed by Young-June Kang; Weon-Jae Ryu; Koung-Suk Kim; Wan-Shik Jang

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 475 KB
• Volume: 33
• Category: Article
• ISSN: 0030-3992
• DOI: 10.1016/s0030-3992(01)00071-8

✦ Synopsis

It is very important that we understand the dynamic behaviors of the laser induced plume in welding, because the laser induced plume has considerable e ects on welding e ciency and the quality of materials. Many experimental studies have been performed in order to observe the plume behaviors using a visualization method. In this paper, we describe the visualization and quantiÿcation of the laser induced plumes by pulse holographic interferometry. A pulsed Nd : YAG laser was used for the generation of laser induced plume and a Q-switched Ruby laser was employed to record the weld plume. For qualitative visualization of the laser induced plume, we used the double-exposure holographic interferometry. Then, we chose the quasi-heterodyne holographic interferometry with the dual-reference-beam and phase shifting in order to visualize the plume quantitatively. The experimental results show the visible behavior of the laser induced plume according to a change in the output power of the pulsed Nd : YAG laser and the time delay of Q-switched Ruby laser. Finally, we obtained the quantitative results by using the dual-reference-beam.