TDLAS based gas absorption spectrum detection system for the college physics experimental teaching

Abstract Laser absorption spectroscopy, grounded in the Lambert-Beer law, stands out as a prevalent non-destructive testing method within optical gas sensing technology. It finds extensive applications across atmospheric environment monitoring, industrial process control, combustion diagnosis, and biomedicine. Within this study, a pioneering gas absorption spectrum detection system is introduced, leveraging LabVIEW programming and tunable diode laser absorption spectroscopy (TDLAS). This system is tailored for college physics education, enabling undergraduates to grasp the fundamental workings of optical gas sensing technology. Methane (CH4) is selected as the target gas molecule for its relevance in environmental dynamics and the push towards carbon neutrality. Investigative experiments delve into diverse spectral line parameters impacting the gas absorption signal profile, as prescribed by the theoretical underpinnings of laser spectroscopy. The teaching methodology proposed herein blends theoretical concepts with hands-on experimentation, fostering a deep student interest in the exploration of gas sensing technologies within the college physics domain.