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  4. Real-time active-gas imaging of small gas leaks
 
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2023
Journal Article
Title

Real-time active-gas imaging of small gas leaks

Abstract
To tackle global warming, the reduction of greenhouse gas leaks is of great public interest. While state-of-the-art optical gas imaging (OGI) cameras can visualize larger gas leaks with magnitudes of liters per minute in the case of methane, a much more sensitive laser-based approach is introduced here. This is accomplished using an infrared camera in combination with an interband cascade laser (ICL) as active illumination. The laser beam diverges such that it covers roughly half of the camera's field of view. Three-image batches are recorded to perform classic direct absorption spectroscopy (DAS) at the image scale. The obtained concentration length in parts per million meter (ppm m) is validated using measurements with varying known methane concentrations, different reflective elements, and varying distances. The real-time camera was able to record and quantify a methane leak as low as 40 mL min-1. Possible incorrect information due to moving objects is taken into account using an adapted frame-difference approach.
Author(s)
Bergau, Max
Endress + Hauser  
Strahl, Thomas  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Scherer, Benjamin
Endress + Hauser  
Wöllenstein, Jürgen  
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Journal
Journal of sensors and sensor systems : JSSS  
Open Access
DOI
10.5194/jsss-12-61-2023
Language
English
Fraunhofer-Institut für Physikalische Messtechnik IPM  
Keyword(s)
  • Gas leakage

  • Greenhouse gas

  • Laser-based gas imaging

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