Quantitative, multi-species gas sensing using broadband terahertz time-domain spectroscopy

IF 2.7 3区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Measurement Science and Technology Pub Date : 2024-01-09 DOI:10.1088/1361-6501/ad1cc8

Chuxuan Zhao, Weitian Wang, Zhu Ning, Zihao Song, Xing Chao

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引用次数: 0

Abstract

The broadband terahertz wave, with its correspondence to the fingerprint spectra of gas molecules and relatively high transmittance through smoke, aerosol, and combustion environments, bears great potential for gas detection and combustion diagnostics. While access to the rotational spectral fingerprints in the terahertz region provides opportunities for species-selective diagnostics with minimized background and cross interference, few studies have been devoted to direct, quantitative, simultaneous analysis of multiple components exploiting the terahertz region. In this work, we achieve quantitative measurements of CO, NH3 and H2O gas concentrations at standard temperature and pressure over a bandwidth of 1 THz, using direct absorption spectrum from femtosecond-laser-based terahertz time-domain spectroscopy. Spectral fitting of the fully resolved rotational lines yields good precision and accuracy with validation against calibrated mixtures. The estimated detection limts of the multi-speices sensing system are 250 ppm·m, 7 ppm·m and 4 ppm·m for CO, NH3 and H2O, respectively. The demonstration of quantitative, multi-species gas sensing indicates the feasibility and practical value of using broadband terahertz absorption spectroscopy for real-time, quantitative analysis and speciation of multicomponent gas in complicated practical environments such as combustion and multi-phase flows.

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利用宽带太赫兹时域光谱进行定量、多物种气体传感

宽带太赫兹波与气体分子的指纹光谱相对应，在烟雾、气溶胶和燃烧环境中的透过率相对较高，因此在气体检测和燃烧诊断方面具有巨大潜力。虽然太赫兹区域的旋转光谱指纹为物种选择性诊断提供了机会，并将背景和交叉干扰降至最低，但很少有研究利用太赫兹区域对多种成分进行直接、定量和同步分析。在这项工作中，我们利用基于飞秒激光的太赫兹时域光谱的直接吸收光谱，在 1 太赫兹的带宽内实现了标准温度和压力下 CO、NH3 和 H2O 气体浓度的定量测量。通过对校准混合物进行验证，对完全解析的旋转线进行光谱拟合可获得良好的精度和准确性。据估计，多物种传感系统对 CO、NH3 和 H2O 的检测极限分别为 250 ppm-m、7 ppm-m 和 4 ppm-m。定量、多种类气体传感的演示表明，在燃烧和多相流等复杂的实际环境中使用宽带太赫兹吸收光谱对多组分气体进行实时、定量分析和分类是可行的，并具有实用价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Measurement Science and Technology 工程技术-工程：综合

CiteScore

4.30

自引率

16.70%

发文量

656

审稿时长

4.9 months

期刊介绍： Measurement Science and Technology publishes articles on new measurement techniques and associated instrumentation. Papers that describe experiments must represent an advance in measurement science or measurement technique rather than the application of established experimental technique. Bearing in mind the multidisciplinary nature of the journal, authors must provide an introduction to their work that makes clear the novelty, significance, broader relevance of their work in a measurement context and relevance to the readership of Measurement Science and Technology. All submitted articles should contain consideration of the uncertainty, precision and/or accuracy of the measurements presented. Subject coverage includes the theory, practice and application of measurement in physics, chemistry, engineering and the environmental and life sciences from inception to commercial exploitation. Publications in the journal should emphasize the novelty of reported methods, characterize them and demonstrate their performance using examples or applications.