22 May 1997 Laser-based thermographic visualization and identification of gases
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This paper reports on investigations regarding the visualization of environmental relevant gases normally invisible to the human eye. The principle of this system is based on the backscatter absorption gas imaging technique developed by Lawrence Livermore National Laboratory and Laser Imaging Systems. Main advantages of this approach in comparison to conventional laser-based remote gas-sensing methods are reachable speed of localization, high sensitivity as well as the detection of multileakages. The applied method is based on infrared (IR)-technology consisting of a thermal imaging device and a tunable CO2-laser. Main aim of a project carried out at the Laser Zentrum Hannover e.V. is the computer based processing of spectroscopic and IR-image information provided by this technique. For this, several important parameters like the wavelength tuning precision, the dependence of the wavelength on the average output power of the laser source as well as the optical resolution have been investigated. The results show, that the BAGI-technology offers a large potential for future developments related to the observation of transparent gases. In addition to this the authors presents a new concept for an enhanced system that would not only be able to visualize gases but also capable of determining their direction of moving, computing their volume and forecasting their possible further spreading.
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Heinz Haferkamp, Heinz Haferkamp, Dirk Seebaum, Dirk Seebaum, Ulrich Schroeder, Ulrich Schroeder, Oliver Thuerk, Oliver Thuerk, } "Laser-based thermographic visualization and identification of gases", Proc. SPIE 3106, Spectroscopic Atmospheric Monitoring Techniques, (22 May 1997); doi: 10.1117/12.274711; https://doi.org/10.1117/12.274711

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