DOI Number : 10.5614/itbj.eng.sci.2005.37.2.2
Hits : 3

Low-Cost Real-Time Gas Monitoring Using a Laser Plasma Induced by a Third Harmonic Q-Switched Nd-YAG Laser

Syahrun Nur Abdulmadjid1, Koo Hendrik Kurniawan2, Tjung Jie Lie2, Yong Inn Lee3, Iwao Kitazima1 & Kiichiro Kagawa4

1Department of Electrical and Electronic Engineering, Faculty of Engineering, Fukui University, 9-1 bunkyo 3-chome, Fukui 910-8507, Japan

2Research Center of Maju Makmur Mandiri Foundation, 40 Srengseng Raya, Kembangan, Jakarta Barat 11630, Indonesia

3Physics Department, Chonbuk National University, Chonju, 561-756, Korea

4Department of Physics, Faculty of Education and Regional Studies, Fukui University, 9-1 bunkyo 3-chome, Fukui 910-8507, Japan


A gas plasma induced by a third harmonic Nd-YAG laser with relatively low pulsed energy (about 10 mJ) has favorable characteristics for gas analysis due to its low background characteristics, nevertheless a high power fundamental Nd-YAG laser (100-200 mJ) is widely used for laser gas breakdown spectroscopy. The air plasma can be used as a low-cost real-time gas monitoring system such that it can be used to detect the local absolute humidity, while a helium plasma can be used for gas analysis with a high level of sensitivity. A new technique using a helium plasma to improve laser ablation emission spectroscopy is proposed. Namely, the third harmonic Nd-YAG laser is focused at a point located some distance from the target in the 1-atm helium surrounding gas. By using this method, the ablated vapor from the target is excited through helium atoms in a metastable state in the helium plasma.

Keywords: third harmonic Nd-YAG laser; air plasma; He plasma; He metastable state; gas monitoring; gas analysis.

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