Special Issue: Modern Sensing Technologies

Vol. 90, April 2008, pp. 284-293

Sensing Technique Using Laser-induced Breakdown Spectroscopy Integrated with Micro-droplet Ejection System

Satoshi Ikezawa, Muneaki Wakamatsu, Joanna Pawłat and Toshitsugu Ueda

Graduate School of IPS, Waseda University,

Hibikino 2-7-S257, Wakamatsu-ku, Kitakyushu-shi, Fukuoka-ken 808-0135, Japan

E-mail: ikezawa@fuji.waseda.jp

 Received: 15 October 2007   /Accepted: 20 February 2008   /Published: 15 April 2008

Abstract: In this paper, laser-induced breakdown spectroscopy (LIBS) using micro-droplet NaCl solution is described. Since the 1980s, many liquid micronizing techniques for LIBS measurements have been reported. In this study, micro-droplet ejection systems for sampling are designed and presented for two volumes. These micro-droplet ejection systems enable a constant volume of the sample liquid to be obtained and they take advantage of the liquid physical state; the density of the solution can be controlled accurately. The methods presented here generate small droplets (diameter 30 or 50 μm) by confining the entire volume of the sample material in the laser beam spot area (minimum beam spot diameter: 53.2 μm) and separating it from its surroundings. Using these liquid micronizing methods, improved sensitivities are obtained for drawing calibration curves for quantitative LIBS measurements.

Keywords: LIBS, quantitative measurement, Laser, Micro-droplet

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