Fathy Alaa, Gnambodoe-Capochichi Martine, Sabry Yasser M, Anwar Momen, Ghoname Amr O, Saeed Ahmed, Leprince-Wang Yamin, Khalil Diaa, Bourouina Tarik
ESYCOM, UMR 9007 CNRS, Univ Gustave Eiffel, 77454 Marne-la-Vallée, France.
Si-Ware Systems, Cairo 11361, Egypt.
Sensors (Basel). 2023 Jul 12;23(14):6343. doi: 10.3390/s23146343.
Gas sensors that can measure multiple pollutants simultaneously are highly desirable for on-site air pollution monitoring at various scales, both indoor and outdoor. Herein, we introduce a low-cost multi-parameter gas analyzer capable of monitoring multiple gaseous pollutants simultaneously, thus allowing for true analytical measurement. It is a spectral sensor consisting of a Fourier-transform infrared (FTIR) gas analyzer based on a mid-infrared (MIR) spectrometer. The sensor is as small as 7 × 5 × 2.5 cm. It was deployed in an open-path configuration within a district-scale climatic chamber (Sense City, Marne-la-Vallée, France) with a volume of 20 × 20 × 8 m. The setup included a transmitter and a receiver separated by 38 m to enable representative measurements of the entire district domain. We used a car inside the climatic chamber, turning the engine on and off to create time sequences of a pollution source. The results showed that carbon dioxide (CO) and water vapor (HO) were accurately monitored using the spectral sensor, with agreement with the reference analyzers used to record the pollution levels near the car exhaust. Furthermore, the lower detection limits of CO, NO and NO were assessed, demonstrating the capability of the sensor to detect these pollutants. Additionally, a preliminary evaluation of the potential of the spectral sensor to screen multiple volatile organic compounds (VOCs) was conducted at the laboratory scale. Overall, the results demonstrated the potential of the proposed multi-parameter spectral gas sensor in on-site gaseous pollution monitoring.
能够同时测量多种污染物的气体传感器对于室内外不同规模的现场空气污染监测来说是非常必要的。在此，我们介绍一种低成本的多参数气体分析仪，它能够同时监测多种气态污染物，从而实现真正的分析测量。它是一种光谱传感器，由基于中红外（MIR）光谱仪的傅里叶变换红外（FTIR）气体分析仪组成。该传感器体积小至7×5×2.5厘米。它以开放路径配置部署在法国马恩河谷省的一个区规模的气候室（感知城市）内，该气候室体积为20×20×8米。该装置包括一个发射器和一个接收器，两者相距38米，以便对整个区域进行代表性测量。我们在气候室内使用一辆汽车，通过启动和关闭发动机来创建污染源的时间序列。结果表明，使用该光谱传感器能够准确监测二氧化碳（CO）和水蒸气（HO），与用于记录汽车尾气附近污染水平的参考分析仪结果一致。此外，还评估了CO、NO和NO的更低检测限，证明了该传感器检测这些污染物的能力。此外，还在实验室规模上对该光谱传感器筛选多种挥发性有机化合物（VOCs）的潜力进行了初步评估。总体而言，结果证明了所提出的多参数光谱气体传感器在现场气态污染监测中的潜力。
