Zhang Lewen, Zhang Zhirong, Sun Pengshuai, Pang Tao, Xia Hua, Cui Xiaojuan, Guo Qiang, Sigrist Markus Werner, Shu Chimin, Shu Zhifeng
Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China; University of Science and Technology of China, Hefei 230026, China.
Anhui Provincial Key Laboratory of Photonic Devices and Materials, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China; Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China; Advanced Laser Technology Laboratory of Anhui Province, Hefei, Anhui 230037, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2020 Oct 5;239:118495. doi: 10.1016/j.saa.2020.118495. Epub 2020 May 16.
Methane (CH) and acetylene (CH) are important bioscience and chemical gases. The real-time monitoring and analysis of them have important research value in industrial process control. The time-sharing scanning assisted wavelength modulation spectroscopy (WMS) technique is developed for real-time and simultaneous detection of CH and CH. This system involves two near-infrared distributed feedback (DFB) lasers and a compact multipass cavity with an effective optical path of 52.2 m. The selected strong absorption lines of methane and acetylene are located at 6046.96 cm-1 and 6531.7 cm-1, respectively. The experiment environment is conducted at room temperature 23 °C and pressure 760 Torr. The sensor performance, including the minimum detection limit (MDL) and the stability, was improved by eliminating the influence of light intensity fluctuation using the WMS-2f/SAW technique. Allan deviation analysis indicates that a MDL of 0.1 ppm for CH and 0.2 ppm for CH are achieved with 1-s integration time. And the instrument response time is about 44 s through the continuous analysis of standard gases. This sensitive, simple, reliable, and lowcost dual-gas sensor is very suitable for applications in the field environment, chemical process, and many other gas-phase analysis areas.
甲烷（CH₄）和乙炔（C₂H₂）是重要的生物科学和化学气体。对它们进行实时监测和分析在工业过程控制中具有重要的研究价值。为了实时同时检测CH₄和C₂H₂，开发了分时扫描辅助波长调制光谱（WMS）技术。该系统包括两台近红外分布反馈（DFB）激光器和一个有效光程为52.2米的紧凑型多程腔。所选择的甲烷和乙炔的强吸收线分别位于6046.96厘米⁻¹和6531.7厘米⁻¹处。实验环境在室温23℃和压力760托下进行。通过使用WMS-2f/SAW技术消除光强波动的影响，提高了传感器性能，包括最低检测限（MDL）和稳定性。阿伦偏差分析表明，在1秒积分时间下，CH₄的MDL为0.1 ppm，C₂H₂的MDL为0.2 ppm。通过对标准气体的连续分析，仪器响应时间约为44秒。这种灵敏、简单、可靠且低成本的双气体传感器非常适合用于现场环境、化学过程及许多其他气相分析领域的应用。
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