Nasrullah Idris, Syahrun Nur Madjid, Muliadi Ramli, Koo Hendrik Kurniawan, Yong Inn Lee, Kiichiro Kagawa
A new electrode circuit for measuring the induced current from laser plasma produced during laser material processing has been devised. The new electrode circuit has greatly increased the possible separation between the electrodes and the workable probing distance of the electrodes from the processed sample surface, namely 38 and 22 mm, respectively, sufficing the requirements of actual industrial laser material processing, avoiding direct contact of the electrodes with the big plasmas and profound sputtering. Several possible electrode configurations were investigated to accommodate the specific needs of the actual laser processing. It was shown that this technique is a very effective tool for accurately determining the moment of completion of penetration, as required in the laser piercing process. In contrast to this, the optical method currently in use cannot accurately determine the piercing completion moment due mainly to the disturbance from smoke arising at the processing point. A preliminary work using a CW CO2 laser normally used in the actual industrial material processing was also made, resulting in a strong induced current signal corresponding to the laser pulse duration and frequency. The signal was successfully used for monitoring the penetration completion in a stainless steel plate drilling process. This reveals that this technique can be used for monitoring actual industrial material processing using high power lasers. © 2008 Elsevier B.V. All rights reserved.
Department of Physics, Faculty of Mathematics and Natural Sciences, Syiah Kuala University, Banda Aceh, Aceh 23111, Darussalam, Indonesia; Department of Chemistry, Faculty of Mathematics and Natural Sciences, Syiah Kuala University, Banda Aceh, Aceh 23111, Darussalam, Indonesia; Research Center, Maju Makmur Mandiri Foundation, Kembangan, Jakarta Barat 11630, 40 Srengseng Raya, Indonesia; Physics Department, Research Institute of Physics and Chemistry, Chonbuk National University, Chonju, 561-756, South Korea; Department of Physics, Faculty of Education and Regional Studies, University of Fukui, Fukui, 910-8507, Japan
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