Hu Lien, Zheng Chuantao, Zhang Minghui, Zheng Kaiyuan, Zheng Jie, Song Zhanwei, Li Xiuying, Zhang Yu, Wang Yiding, Tittel Frank K
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun, 130012, PR China.
Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, TX, 77005, USA.
Photoacoustics. 2020 Dec 9;21:100230. doi: 10.1016/j.pacs.2020.100230. eCollection 2021 Mar.
A wavelength-locked light-induced thermo-elastic spectroscopy (WL-LITES) gas sensor system was proposed for long-distance in-situ methane (CH) 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 CH 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 CH 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 CH leakage reveals that the proposed sensor system can realize a fast response (< 12 s) for field application.
提出了一种波长锁定光致热弹性光谱（WL-LITES）气体传感器系统，用于使用光纤耦合传感探头进行长距离原位甲烷（CH₄）检测。采用波长锁定方案来加快传感器响应，而无需在CH₄吸收线上扫描激光波长。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。基于实验和模拟对QTF的光激发参数进行了优化，以提高LITES技术的信噪比。采用艾伦偏差分析来评估所提出传感器系统的检测限。在0.3 s的锁定积分时间和约100 m的光纤条件下，WL-LITES气体传感器系统对CH₄检测的体积最低检测限（MDL）约为11 ppm（体积分数，ppmv），平均时间约为35 s时，MDL可进一步降低至约1 ppmv。对CH₄泄漏的实时原位监测表明，所提出的传感器系统可实现快速响应（<12 s），适用于现场应用。
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