Cantilever-Enhanced Fiber-Optic Photoacoustic Spectrophone for Low-Pressure Gas Detection.

IF 6.7 1区 化学 Q1 CHEMISTRY, ANALYTICAL
Analytical Chemistry Pub Date : 2025-01-14 Epub Date: 2025-01-01 DOI:10.1021/acs.analchem.4c05422
Chenxi Li, Xiao Han, Min Guo, Hongchao Qi, Jingya Zhang, Xinyu Zhao, Ke Chen
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引用次数: 0

Abstract

A cantilever-enhanced fiber-optic photoacoustic (PA) spectrophone is reported for trace gas detection at a low-pressure environment. A cantilever-based fiber-optic Fabry-Perot (F-P) interferometer (FPI) is utilized for simultaneous measurement of air pressure and PA pressure. Since the cantilever resonance frequency follows air pressure linearly, the fundamental frequency intensity modulation (1f-IM) technique is applied to scan the frequency response of the solid PA signal from tube wall absorption for tracking the cantilever resonance frequency in real time. The second-harmonic wavelength modulation spectroscopy (2f-WMS) technique is used to measure the gas PA pressure wave at the cantilever resonance. According to the inverse restriction relationship of air pressure on the PA excitation and cantilever detection, the measured gas PA signal at the low-pressure environment is enhanced. The target gas concentration is corrected by the measured air pressure, which makes the spectrophone generally applicable under any pressure. The experimental results indicate that the normalized noise equivalent absorption (NNEA) coefficients of the spectrophone in the standard atmospheric pressure and the low-pressure environment of 60 kPa are 2.2 × 10-9 and 2.0 × 10-9 cm-1·W·Hz-1/2, respectively. 0.1 ppm acetylene (C2H2) can be detected at any air pressure. The detected maximum relative error of 10 ppm C2H2 gas under different pressures is less than ±9% and the error is reduced to less than ±2% when the concentration rises to 70 ppm. In the pressure range of 60-100 kPa, the cantilever-enhanced fiber-optic PA spectrophone has extremely high accuracy and pressure stability, covering the pressure range of most ground gas detection scenes.

用于低压气体检测的悬臂增强型光纤光声光谱仪。
报道了一种用于低压环境下痕量气体检测的悬臂增强型光纤光声(PA)光谱仪。利用悬臂式光纤法布里-珀罗干涉仪(FPI)同时测量气压和PA压力。由于悬臂谐振频率与气压呈线性关系,采用基频强度调制(1f-IM)技术扫描管壁吸收固体扩音信号的频率响应,实时跟踪悬臂谐振频率。采用二次谐波波长调制光谱(2f-WMS)技术测量了悬臂共振下的气体PA压力波。根据气压对振子激励和悬臂梁检测的逆约束关系,增强了低压环境下实测气体振子信号。目标气体浓度通过测量的空气压力进行校正,这使得声谱仪在任何压力下都能普遍适用。实验结果表明,在标准大气压和60 kPa低压环境下,声谱仪的归一化噪声等效吸收系数分别为2.2 × 10-9和2.0 × 10-9 cm-1·W·Hz-1/2。0.1 ppm的乙炔(C2H2)可以在任何气压下检测到。10 ppm C2H2气体在不同压力下的检测最大相对误差小于±9%,当浓度上升到70 ppm时,误差减小到±2%以下。在60-100 kPa的压力范围内,悬臂增强型光纤扩音光谱仪具有极高的精度和压力稳定性,覆盖了大多数地面气体检测场景的压力范围。
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来源期刊
Analytical Chemistry
Analytical Chemistry 化学-分析化学
CiteScore
12.10
自引率
12.20%
发文量
1949
审稿时长
1.4 months
期刊介绍: Analytical Chemistry, a peer-reviewed research journal, focuses on disseminating new and original knowledge across all branches of analytical chemistry. Fundamental articles may explore general principles of chemical measurement science and need not directly address existing or potential analytical methodology. They can be entirely theoretical or report experimental results. Contributions may cover various phases of analytical operations, including sampling, bioanalysis, electrochemistry, mass spectrometry, microscale and nanoscale systems, environmental analysis, separations, spectroscopy, chemical reactions and selectivity, instrumentation, imaging, surface analysis, and data processing. Papers discussing known analytical methods should present a significant, original application of the method, a notable improvement, or results on an important analyte.
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