基于可调谐半导体激光器吸收光谱的高灵敏度甲烷浓度遥测技术

发布时间：2018-06-16 20:41

  本文选题：波长调制光谱 + 遥测　； 参考：《物理学报》2017年10期

【摘要】：讨论了一种新的高灵敏度甲烷遥测方法,利用可调谐激光二极管的调制光谱技术扫描甲烷的吸收峰,通过在测量光路中插入参考气池,增强低浓度情况下的吸收峰辨识能力,以提高甲烷浓度遥测信号的信噪比.此外,可以将激光器的中心波长锁定至气体吸收峰的峰值位置从而使仪器工作于吸收峰锁定模式,进行甲烷浓度的连续监测.实验结果表明,在测量距离分别为10 m和20 m时,周围环境中的甲烷积分浓度探测极限可以分别达到5 ppm·m和16 ppm·m.在吸收峰锁定工作模式下,系统在37 m距离处具有22 ppm·m的检出限,并可以监测甲烷浓度的快速变化.
[Abstract]:A new method for methane telemetry with high sensitivity is discussed. The modulation spectrum of tunable laser diode is used to scan the absorption peak of methane, and the identification ability of absorption peak at low concentration is enhanced by inserting a reference gas cell into the measurement path. In order to improve the signal-to-noise ratio of the telemetry signal of methane concentration. In addition, the central wavelength of the laser can be locked to the peak position of the gas absorption peak to enable the instrument to work in the absorption peak locking mode for continuous monitoring of methane concentration. The experimental results show that the detection limits of methane integral concentration in the surrounding environment can reach 5 ppm m and 16 ppm m, respectively, when the measuring distances are 10 m and 20 m, respectively. In the mode of absorption peak locking, the system has a detection limit of 22 ppm m at a distance of 37 m, and can monitor the rapid change of methane concentration.
【作者单位】： 清华大学精密仪器系精密测试技术及仪器国家重点实验室;
【基金】：国家重大科学仪器设备开发专项(批准号:2012YQ200182,2012YQ0901670602)资助的课题~~
【分类号】：TN248.4
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本文编号：2028038