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Long-distance in-situ methane detection using near-infrared light-induced thermo-elastic spectroscopy
Photoacoustics ( IF 7.1 ) Pub Date : 2020-12-09 , DOI: 10.1016/j.pacs.2020.100230
Lien Hu , Chuantao Zheng , Minghui Zhang , Kaiyuan Zheng , Jie Zheng , Zhanwei Song , Xiuying Li , Yu Zhang , Yiding Wang , Frank K. Tittel

A wavelength-locked light-induced thermo-elastic spectroscopy (WL-LITES) gas sensor system was proposed for long-distance in-situ methane (CH4) detection using a fiber-coupled sensing probe. The wavelength-locked scheme was used to speed the sensor response without scanning the laser wavelength across the CH4 absorption line. A small-size piezoelectric quartz tuning fork (QTF) with a wide spectral response range was adopted to enhance the photo-thermal signal. The optical excitation parameters of the QTF were optimized based on experiment and simulation for improving the signal-to-noise ratio of the LITES technique. An Allan deviation analysis was employed to evaluate the limit of detection of the proposed sensor system. With a 0.3 s lock-in integration time and a ∼ 100 m optical fiber, the WL-LITES gas sensor system demonstrates a minimum detection limit (MDL) of ∼ 11 ppm in volume (ppmv) for CH4 detection, and the MDL can be further reduced to ∼ 1 ppmv with an averaging time of ∼ 35 s. A real-time in-situ monitoring of CH4 leakage reveals that the proposed sensor system can realize a fast response (< 12 s) for field application.



中文翻译:

使用近红外光致热弹性光谱技术进行远距离原位甲烷检测

提出了一种波长锁定的光致热弹性光谱(WL-LITES)气体传感器系统,用于使用光纤耦合传感探头进行远距离原位甲烷(CH 4)检测。波长锁定方案用于加快传感器响应速度,而无需扫描整个CH 4上的激光波长吸收线。采用具有宽光谱响应范围的小型压电石英音叉(QTF)来增强光热信号。基于实验和仿真对QTF的光激发参数进行了优化,以提高LITES技术的信噪比。使用Allan偏差分析来评估所提出的传感器系统的检测极限。WL-LITES气体传感器系统具有0.3 s的锁定积分时间和约100 m的光纤,显示出对CH 4的检测的最低检测限(MDL)约为体积(ppmv)的11 ppm ,并且MDL可以进一步降低到〜1 ppmv,平均时间为〜35 s。CH 4的实时原位监控 泄漏表明,所提出的传感器系统可以实现现场应用的快速响应(<12 s)。

更新日期:2020-12-30
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