Near- and mid-infrared laser monitoring of industrial processes, environment and security applications

被引:270
作者
Willer, Ulrike [1 ]
Saraji, Mohammad [1 ]
Khorsandi, Alireza [1 ]
Geiser, Peter [1 ]
Schade, Wolfgang [1 ]
机构
[1] Tech Univ Clausthal, Inst Phys & Phys Technol, D-38678 Clausthal Zellerfeld, Germany
关键词
near-and mid-infrared laser spectroscopy; fiber sensor; combustion; evanescent field; explosives;
D O I
10.1016/j.optlaseng.2005.04.015
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
The advantages of infrared laser monitoring in terms of sensitivity, selectivity and the ability of non-intrusive detection of gases are reviewed. Emphasis is laid on direct absorption spectroscopy and evanescent-field spectroscopy. The performance of the latter for gas detection in the near-infrared is demonstrated for the analysis of volcanic gases. For industrial process control, direct mid-infrared absorption spectroscopy is used to detect CO in the high-temperature atmosphere of a glass melting furnace. For both applications portable, stable, rugged and easy-to-handle laser systems are needed. Mid-infrared absorption spectroscopy is also applied to detect different explosives. Material evaporation is achieved by plasma generation with a pulsed laser at high repetition rate. Energetic materials contain high concentrations of nitrogen; therefore NO is present in the generated plasma. However, the rate at which NO is produced varies in a highly characteristic manner for different energetic materials. This enables the distinction between different types of explosives. (c) 2005 Elsevier Ltd. All rights reserved.
引用
收藏
页码:699 / 710
页数:12
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