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CO Detection System Based on TDLAS Using a 4.625 μm Interband Cascaded Laser
Kun Li1, Boyang Wang1, Mingyao Yuan1
1Kunming Institute of Physics, Kunming 650223, China.
International Journal of Environmental Research and Public Health
|October 14, 2022
Summary
This study presents a tunable diode laser absorption spectroscopy (TDLAS) system for detecting carbon monoxide (CO). The TDLAS system achieved a minimum detectable CO concentration of 10.32 ppmm over an 8m open optical path.
Area of Science:
- Analytical Chemistry
- Laser Spectroscopy
- Environmental Monitoring
Background:
- Carbon monoxide (CO) poses significant risks in industrial settings due to potential accumulation from poor ventilation or appliance maintenance.
- Early detection of low CO concentrations is crucial for ensuring safety in industrial operations and confined spaces.
- Lasers offer versatile applications in gas detection owing to the selective absorption of specific light wavelengths by gas molecules.
Purpose of the Study:
- To develop and evaluate a tunable diode laser absorption spectroscopy (TDLAS) system for sensitive and remote carbon monoxide (CO) detection.
- To assess the performance of an interband cascaded laser (ICL) based TDLAS system for CO monitoring in open optical paths.
Main Methods:
- Construction of a TDLAS system utilizing an interband cascaded laser (ICL) emitting at 4.625 μm for CO detection.
- Implementation of a modulated signal generated by an FPGA module to control the laser and process detector signals.
- Application of lock-in amplification to extract the second harmonic signal for high-frequency modulation analysis.
Main Results:
- The developed TDLAS system successfully identified various concentrations of CO dispersed via static gas distribution.
- An open optical path CO detection system was established with a detection distance of approximately 8 meters.
- The minimum detectable concentration for CO was determined to be approximately 10.32 ppmm.
- Calibrated measurements in an open optical path indicated a CO concentration of 510.6 ppmm.
Conclusions:
- The interband cascaded laser (ICL) based TDLAS system demonstrates effective remote CO monitoring capabilities in open optical paths.
- The system's sensitivity and detection range make it suitable for industrial safety and environmental monitoring applications.
- TDLAS technology offers a viable solution for real-time, non-invasive CO detection in challenging environments.
