Real-time active-gas imaging of small gas leaks

Journal of Sensors and Sensor Systems

article

Max Bergau¹  Thomas Strahl³  Benjamin Scherer¹  Jürgen Wöllenstein³ 

[1] Sensors Automation Lab;Laboratory for Gas Sensors, Department of Microsystems Engineering, University of Freiburg;Department of Gas and Process Technology

DOI  :  10.5194/jsss-12-61-2023

学科分类：医学（综合）

来源: Copernicus Publications

【 摘 要 】

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 suchthat it covers roughly half of the camera's field of view. Three-image batches are recorded to perform classic direct absorptionspectroscopy (DAS) at the image scale. The obtained concentration length in parts per million meter (ppm m) is validated using measurements with varying known methaneconcentrations, different reflective elements, and varying distances. The real-time camera was able to record and quantify a methaneleak as low as 40 mL min −1 . Possible incorrect information due to moving objectsis taken into account using an adapted frame-difference approach.

【 授权许可】

CC BY