Calibration-free quartz tuning fork enhanced laser spectroscopy for trace gas detection

IF 3.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-09-27 DOI:10.1016/j.snb.2025.138854

Linguang Xu, Qiannan Cai, Dingli Xu, Haoyue Wu, Gang Zhang, Qiang Ge, Jingsong Li

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Abstract

In this paper, a calibration-free quartz tuning fork enhanced laser spectroscopy (QTFELS) gas sensing system is presented for trace gas detection. To demonstrate the proposed gas detection technique, a near-infrared distributed feedback (DFB) semiconductor laser operating at 1653 nm was combined with a 30-meter multi-pass cell was specifically employed for CH₄ gas measurements using the first harmonic-normalized second harmonic signal of wavelength modulation spectroscopy (WMS-2f/1 f). A standard spectral model and least-squares-based calibration-free algorithm were proposed for real-time inversion of gas concentrations. This algorithm is designed to compensate for signal amplitude fluctuations in QTF detectors induced by ambient light intensity variations. Experimental results demonstrate that the 2 f/1 f signal ratio exhibits an 8.31-fold enhancement in response sensitivity for concentration retrieval compared to the standalone 2 f signal. The CH₄ detection system achieves a maximum error below 3.3%, with its precision reaching 20 ppb at an optimal Allan deviation integration time of 308 s. Finally, the proposed gas sensing system was employed for approximately 24-hour long-term measurements of ambient CH₄ concentrations outside the laboratory, demonstrating the sensor's exceptional monitoring performance.

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无校准石英音叉增强激光光谱痕量气体检测

本文提出了一种无需校准的石英音叉增强激光光谱（QTFELS）气体传感系统，用于微量气体检测。为了验证所提出的气体检测技术，将工作波长为1653 nm的近红外分布反馈（DFB）半导体激光器与30米多通电池相结合，利用波长调制光谱（WMS-2f/ 1f）的一次谐波归一化二次谐波信号对CH4气体进行测量。提出了一种用于实时反演气体浓度的标准光谱模型和基于最小二乘的免校准算法。该算法用于补偿环境光强变化引起的QTF探测器信号幅度波动。实验结果表明，与单独的2f信号相比，2f / 1f信号比对浓度检索的响应灵敏度提高了8.31倍。CH4检测系统最大误差在3.3%以下，在最优Allan偏差积分时间为308 s时，检测精度可达20 ppb。最后，采用所提出的气体传感系统对实验室外的环境CH4浓度进行了大约24小时的长期测量，证明了该传感器的卓越监测性能。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.