| Autor: |
Syahrun Nur Abdulmadjid, Koo Hendrik Kurniawan, Tjung Jie Lie, Yong Inn Lee, Iwao Kitazima, Kiichiro Kagawa |
| Jazyk: |
angličtina |
| Rok vydání: |
2005 |
| Předmět: |
|
| Zdroj: |
ITB Journal of Engineering Science, Vol 37, Iss 2, Pp 91-106 (2005) |
| Druh dokumentu: |
article |
| ISSN: |
1978-3051 |
| Popis: |
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. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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