Infrared photoacoustic spectrometer for CO2 detection
Didar R. Makashev1, David A. López Guardado1, Viktor V. Nikolaev1, Yury V. Kistenev2;
1 Laboratory of Ecophotonics, Tomsk State University 36, Lenin Ave., Tomsk, 634050 Russia
2 Laboratory of Laser Molecular Imaging and Machine Learning, Tomsk State University 36, Lenin Ave., Tomsk, 634050 Russia
Abstract
Carbon dioxide (CO₂) detection is important in a wide range of applications, including environmental monitoring, air-quality assessment and industrial process control. Characteristic absorption bands of CO₂ in the infrared (IR) spectral range can be targeted for its selective detection and quantitative analysis. Low power IR semiconductor diode lasers also provide the possibility of developing compact and cost-effective sensing systems. Photoacoustic spectroscopy (PAS) in combination with a low power IR semiconductor diode laser can provide the possibility of developing sensitive, mobile and cost-effective systems for gas detection with real-time monitoring potential.
An infrared photoacoustic spectrometer for CO₂ detection is presented. A distributed feedback laser diode with a center wavelength of 1570 nm was selected as an optical source to target CO₂ absorption. The spectrometer employs a differential photoacoustic detector fabricated by photopolymer stereolithography 3D printing. The geometry of the differential photoacoustic detector was optimized using computer simulation to maximize the photoacoustic signal.
The developed spectrometer was experimentally tested using a gas sample with a CO₂ concentration of 10%. The test results demonstrate the feasibility of the proposed spectrometer for a variety of CO₂ sensing applications.
The work was performed according to the Government research assignment for TSU, project FSWM-2025-0038
Speaker
Makashev Didar Ruslanovich
LMIML Laboratory, Tomsk State University
Russia
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