Mid-Infrared Absorption Spectroscopy for NO and NO2 Detection in a Flexible Hollow Core Fiber (Invited)
Citation
温大新, 高丽梅, 段锟, 吉雍彬, 石艺尉, & 任伟. (2024). 基于柔性空芯光纤的NO与NO2中红外吸收光谱检测（特邀） [Mid-Infrared Absorption Spectroscopy for NO and NO2 Detection in a Flexible Hollow Core Fiber (Invited)]. 激光与光电子学进展 [Laser & Optoelectronics Progress], 61(3), 58-62. https://doi.org/10.3788/LOP232576
Keywords
- Laser absorption spectroscopy (LAS)
- Flexible hollow-core fiber (HCF)
- Quantum cascade laser (QCL)
- Mid-infrared (MIR)
- Nitric oxide (NO)
- Nitrogen dioxide (NO2)
- Intermittent continuous wave (iCW)
- Time-division multiplexing (TDM)
- Direct absorption spectroscopy (DAS)
- Wavelength modulation spectroscopy (WMS)
- First harmonic normalized second harmonic (2f/1f)
Brief
This article reports on a mid-infrared absorption spectroscopy technique using flexible hollow-core fiber and quantum cascade lasers to simultaneously and sensitively detect NO and NO2 gases, achieving detection limits of 39×10−9 for NO and 9. 2×10−9 for NO2.
Summary
This study reports a miniaturizable mid-infrared gas sensor utilizing flexible hollow-core fiber and two quantum cascade lasers (QCLs) operating in intermittent continuous wave (iCW) mode for the simultaneous and sensitive detection of NO and NO2. The sensor employs both direct absorption spectroscopy (DAS) and wavelength modulation spectroscopy (WMS), achieving detection limits of 39×10−9 for NO and 9.2×10−9 for NO2 with good precision, showcasing its potential for environmental monitoring and other applications. The use of iCW mode and flexible HCF contributes to the system's compactness.
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