Resonant photoacoustic cells for laser-based methane detection

Journal of Sensors and Sensor Systems

article

Katrin Schmitt¹  Mara Sendelbach¹  Christian Weber¹  Jürgen Wöllenstein¹  Thomas Strahl¹ 

[1] Fraunhofer Institute for Physical Measurement Techniques IPM;University of Freiburg, Institute of Microsystems Engineering, Laboratory for Gas Sensors;present address: Diotec Semiconductor AG

DOI  :  10.5194/jsss-12-37-2023

学科分类：医学（综合）

来源: Copernicus Publications

【 摘 要 】

Against the background of the steady increase ingreenhouse gases in the atmosphere, a fast and inexpensive method fordetecting methane is required. This applies to the direct measurement of thebackground concentration of methane in the atmosphere and also to thedetection of leaks in natural gas pipelines. Photoacoustic (PA) sensorsoffer the possibility of highly sensitive gas detection andcost-effective design at the same time. In this work, we investigated a photoacoustic sensorfor methane in low concentrations, focusing on a special cell design, theso-called T-cell. Different cylinder geometries of six T-cells and theinfluence on the sensor performance were examined. An interband cascadelaser (ICL) with a central wavelength of 3270 nm was used for excitationand a micro-electromechanical systems (MEMS) microphone as detector. The detection limits achieved were belowthe methane background concentration in air of 1.8 ppm.

【 授权许可】

CC BY