2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 7: Energy Production, Environmental & Multiscale
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 528 pages |
| ISBN: | 978-1-987820-09-6 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Gas Analysis by Laser-Induced Breakdown Spectroscopy
Maryam Dehghani1;1NATIONAL IRANIAN OIL COMPANY, Omiodieh, Iran (Islamic Republic of Iran);
Type of Paper: Regular
Id Paper: 157
Topic: 15
Abstract:
Laser-induced breakdown spectroscopy (LIBS) is a type of atomic emission spectroscopy which uses a highly energetic laser pulse as the excitation source. The laser is focused to form plasma, which atomizes and excites samples. In principle, LIBS can analyze any matter regardless of its physical state, be it solid, liquid or gas. Because all elements emit light of characteristic frequencies when excited to sufficiently high temperatures, LIBS can (in principle) detect all elements, limited only by the power of the laser as well as the sensitivity and wavelength range of the spectrograph & detector. In practice, detection limits are a function of a) the plasma excitation temperature, b) the light collection window, and c) the line strength of the viewed transition. In laser induced breakdown spectroscopy (LIBS), a high power laser pulse is used to ablate a small volume of a sample and excite it to a plasma state. As the ionized particles recombine, they emit light that can be analyzed to determine the composition of the gas. The accuracy of LIBS is dependent on selecting appropriate laser parameters for the application. There is no single LIBS system that will work in all situations. Much of the work done with LIBS is qualitative; it is used to test for the presence of a particular compound without concern for the concentration. The complexity of the plasma plume makes it difficult to get accurate qualitative LIBS results, but it is possible under certain conditions.