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Proceedings Paper

Laser-based visualization of environmental crucial gases
Author(s): Heinz Haferkamp; Martin Goede; Ulrich Schroeder
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Paper Abstract

The principle of the presented visualization system is based on the backscatter absorption gas imaging technique. Applying this technique, developed by Lawrence Livermore National Laboratory and Laser Imaging Systems in the USA, it is possible to visualize a large amount of environmental relevant gases normally invisible to the human eye. An image of the spreading of gases is created from infrared (IR) laser radiation that is backscattered from the scenery background in the field of view of a special designed IR- camera. Gaseous components within this field of view absorb a portion of the emitted laser radiation at their specific absorption wavelength and cause an attenuation of a portion of the radiation, backscattered by the scenery background. This leads to a dark gas image on the video screen. Analyzing the wavelength of maximum attenuation then allows the identification of the observed gas. The applied method is based on commercially available IR technology consisting of a thermal imaging device and a tunable CO2-laser. Main advantages of this approach in comparison to conventional laser-based remote gas-sensing methods (i.e. Differential Absorption Lidar DIAL or Raman Lidar) are reachable speed of localization, high sensitivity as well as the detection of multileakages. Main aim of a project carried out at the Laser Zentrum Hannover is the computer based processing of spectroscopic and IR-image information provided by the visualization system described above. For this the dependence between the wavelength and the power output of the laser has to be known and so investigations have been carried out to determine this dependence.

Paper Details

Date Published: 24 September 1998
PDF: 10 pages
Proc. SPIE 3414, Opto-Contact: Workshop on Technology Transfers, Start-Up Opportunities,and Strategic Alliances, (24 September 1998); doi: 10.1117/12.323525
Show Author Affiliations
Heinz Haferkamp, Laser Zentrum Hannover e.V. (Germany)
Martin Goede, Laser Zentrum Hannover e.V. (Germany)
Ulrich Schroeder, Laser Zentrum Hannover e.V. (Germany)

Published in SPIE Proceedings Vol. 3414:
Opto-Contact: Workshop on Technology Transfers, Start-Up Opportunities,and Strategic Alliances
Robert J. L. Corriveau; M. J. Soileau; Michel Auger, Editor(s)

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