Compact and Versatile QEPAS-Based Sensor Box for Simultaneous Detection of Methane and Infrared Absorber Gas Molecules in Ambient Air

A. Zifarelli, G. Menduni, M. Giglio, A. Elefante, A. Sukhinets, A. Sampaolo, P. Patimisco, Sun Fangyuan, Wang Chongwu, Qi Jie Wang, V. Spagnolo
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引用次数: 9

Abstract

In this work we report on an innovative sensor box employing two acoustic detection modules connected in series for quartz-enhanced photoacoustic multi-gas detection. One detection module is coupled with an internal distributed-feedback quantum cascade laser (DFB-QCL) emitting at ∼7.719 µm for methane (CH4) sensing, while the second module has been designed to be coupled with an external laser source targeting the absorption features of a specific gas molecule Mx in the infrared spectral range. The sensor box can thus be employed for any application, depending on the CH4/Mx gas combination to be detected. The ∼7.719 µm DFB-QCL also allowed water vapor monitoring. To demonstrate the sensor versatility, we report on the QEPAS-box environmental monitoring application by simultaneously detecting in air methane, which is a greenhouse gas, nitric oxide (NO), an ozone depleting substance, and water vapor. Sensitivity levels of 4.30 mV ppm−1 and 17.51 mV ppm−1 and minimum detection limits of 48 ppb and 11 ppb for methane and nitric oxide detection were achieved, respectively. The sensor box operation was tested by analysing ambient air. Average concentrations of ∼1.73 ppm of CH4, ∼0.134 ppm of NO and 1.8% of H2O were measured.
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基于QEPAS的小型通用传感器盒,用于同时检测环境空气中的甲烷和红外吸收气体分子
在这项工作中,我们报告了一种创新的传感器盒,该传感器盒采用两个串联的声学检测模块,用于石英增强光声多气体检测。一个检测模块与内部分布式反馈量子级联激光器(DFB-QCL)耦合,该激光器发射约7.719µm,用于甲烷(CH4)传感,而第二个模块被设计为与外部激光源耦合,目标是红外光谱范围内特定气体分子Mx的吸收特征。因此,传感器盒可以用于任何应用,这取决于要检测的CH4/Mx气体组合。~7.719µm DFB-QCL还允许对水蒸气进行监测。为了证明传感器的多功能性,我们报告了QEPAS盒子环境监测应用,通过同时检测空气中的甲烷(一种温室气体)、一氧化氮(NO)(一种消耗臭氧层的物质)和水蒸气。甲烷和一氧化氮检测的灵敏度分别为4.30 mV ppm−1和17.51 mV ppm−2,最低检测限分别为48 ppb和11 ppb。通过分析环境空气来测试传感器箱的操作。测量了~1.73ppm的CH4、~0.134ppm的NO和1.8%的H2O的平均浓度。
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