基于双螺旋联合/分裂光斑模式的高灵敏度TDLAS传感器。

IF 6.7 1区化学 Q1 CHEMISTRY, ANALYTICAL

Analytical Chemistry Pub Date : 2025-07-03 DOI:10.1021/acs.analchem.5c03159

Haiyue Sun,Xiaorong Sun,Ying He,Shunda Qiao,Yufei Ma

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引用次数: 0

摘要

提出了一种基于双螺旋联合/分裂光斑模式的高灵敏度可调谐二极管激光吸收光谱传感器。为了在紧凑的结构下获得较高的检测灵敏度，设计了一种基于三镜多通单元（MPC）的密集双螺旋联合光斑图。相应的甲烷（CH4）检测最低检出限（MDL）提高到122.9 ppb。当集成时间延长到200s时，MDL降低到15.4 ppb。本文介绍了CH4测量在城市环境监测中的应用实例。为实现实时同步双分量TDLAS传感器，设计了双螺旋分光斑结构。在同时连续监测CH4和乙炔（C2H2）时，成功地获得了与浓度高度敏感的线性关系。CH4/C2H2检测的MDLs分别为354.7和111.2 ppb。当整合时间设置为100 s时，相应的mdl分别提高到35.7和19.5 ppb。

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High-Sensitivity TDLAS Sensors Based on Double-Helix United/Split Spot Patterns.

This paper presents a highly sensitive tunable diode laser absorption spectroscopy (TDLAS) sensor based on a double-helix united/split spot pattern. A dense double-helix united spot pattern was designed based on a three-mirror multipass cell (MPC) to obtain high detection sensitivity in a compact structure. The corresponding minimum detection limit (MDL) for methane (CH4) detection was enhanced to be 122.9 ppb. When the integration time was extended to 200 s, the MDL was reduced to 15.4 ppb. An example of a CH4 measurement application in urban environmental monitoring was presented in this research. A double-helix split spot pattern was designed to realize a real-time simultaneous dual-component TDLAS sensor. In the simultaneous and continuous monitoring of CH4 and acetylene (C2H2), a highly sensitive linear relationship with the concentration was successfully obtained. Corresponding MDLs for the CH4/C2H2 detection were calculated to be 354.7 and 111.2 ppb, respectively. When the integration time was set to 100 s, the corresponding MDLs were enhanced to 35.7 and 19.5 ppb, respectively.

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来源期刊

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.