Hydrogen Sensor Based on Tunable Diode Laser Absorption Spectroscopy
Hydrogen Sensor Based on Tunable Diode Laser Absorption Spectroscopy
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DOI：
10.3390/s19235313
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发表时间：
2019-12-01
期刊：
影响因子：
3.9
通讯作者：
Paulsen, Ketil Gorm
中科院分区：
文献类型：
--
作者：
Avetisov, Viacheslav;Bjoroey, Ove;Paulsen, Ketil Gorm
研制了一种基于波长调制光谱技术的激光氢传感器，用于非接触测量分子氢。该传感器使用分布反馈（DFB）激光器，以2121.8 nm处的H-2四极吸收线为目标。H-2吸收线表现出弱的碰撞增宽和强的碰撞窄化效应。这两种效应进行了研究，通过比较测量的吸收线宽与详细的模型，使用不同的线轮廓，包括碰撞窄化效应。确定了纯氢以及氢在氮气和空气中的碰撞增宽和缩窄参数。对传感器的性能进行了评估，并证明了传感器在0- 10%v的H-2范围内测量H-2的适用性。当吸收光程为1 m（0.02%v.m），积分时间为1 s时，测量精度为0.02%v.在最佳平均时间为20 s时，精密度可达0.005% v.m. H-2浓度与传感器响应之间存在良好的线性关系。该传感器的发射器-接收器配置简单而坚固，可在恶劣的工业环境中进行现场安装。
A laser-based hydrogen (H-2) sensor using wavelength modulation spectroscopy (WMS) was developed for the contactless measurement of molecular hydrogen. The sensor uses a distributed feedback (DFB) laser to target the H-2 quadrupole absorption line at 2121.8 nm. The H-2 absorption line exhibited weak collisional broadening and strong collisional narrowing effects. Both effects were investigated by comparing measurements of the absorption linewidth with detailed models using different line profiles including collisional narrowing effects. The collisional broadening and narrowing parameters were determined for pure hydrogen as well as for hydrogen in nitrogen and air. The performance of the sensor was evaluated and the sensor applicability for H-2 measurement in a range of 0-10 %v of H-2 was demonstrated. A precision of 0.02 %v was achieved with 1 m of absorption pathlength (0.02 %v.m) and 1 s of integration time. For the optimum averaging time of 20 s, precision of 0.005 %v.m was achieved. A good linear relationship between H-2 concentration and sensor response was observed. A simple and robust transmitter-receiver configuration of the sensor allows in situ installation in harsh industrial environments.