Hydrogen emission has been studied in laser plasmas by focusing a TEA CO2 laser (10.6μm, 500 mJ, 200 ns) on various types of samples, such as glass, quartz, black plastic sheet, and oil on copper plate sub-target. It was found that Hα emission with a narrow
spectral width occurs with high efficiency when the laser plasma is produced in the low-pressure region. On the contrary, the conventional well-known laser-induced breakdown spectroscopy (LIBS), which is usually carried out at atmospheric air pressure, cannot be applied to the analysis of
hydrogen as an impurity. By combining low-pressure laser-induced plasma spectroscopy with laser surface cleaning, a preliminary quantitative analysis was made on zircaloy pipe samples intentionally doped with hydrogen. As a result, a good linear relationship was obtained between Hα
emission intensity and its concentration.
Department of Fiber Amenity Engineering, Graduate School of Engineering, University of Fukui, Fukui 910-8507, Japan
Publication date: January 1, 2005
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