Simultaneous measurement of temperature and C2H4 concentration in hydrocarbon flames using interference-immune differential absorption spectroscopy at 3.3 μm

IF 3.1 3区 物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION Infrared Physics & Technology Pub Date : 2024-09-15 DOI:10.1016/j.infrared.2024.105556
Wenjian Huang, Guangzhen Gao, Mingke Zhang, Shujing Ruan, Tingdong Cai
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Abstract

In diagnostic applications based on tunable diode laser absorption spectroscopy, the measurement of target substances can be influenced by factors such as background thermal radiation in the combustion environment, extinction caused by solid or liquid particles, and other interfering absorptions. In this work, we developed a differential absorption diagnostic technique based on wavelength pairs, utilizing an interband cascade laser near 3.3 μm to simultaneously measure temperature and C2H4 concentration in hydrocarbon flames. Based on a detailed study of the C2H4 spectrum in this region and considering the optimal standard for spectral lines, two wavelength pairs were selected. The temperature is determined by the ratio of the absorption cross-sections of two wavelength pairs, and the C2H4 concentration is inferred based on the wavelength pair with higher differential absorption. In the initial stage, the system’s accuracy was verified in high-temperature static conditions (T = 300–800 K, P = 1 atm), and continuous time series measurements demonstrated the system’s stability. The limit of detection achieved by Allan-Werle variance analysis is 2.5 ppm at the optimal average time of 100 s. Subsequently, measurements were taken in a hydrocarbon flame. The obtained results indicate an average deviation of 1.021 % between the measured temperature in the flame and the reference value, with a standard deviation of 1.381 % for concentration measurement. All the measurements show that the system can be potentially applied to combustion diagnosis.

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利用 3.3 μm 波长的干涉免疫微分吸收光谱法同时测量碳氢化合物火焰中的温度和 C2H4 浓度
在基于可调谐二极管激光吸收光谱的诊断应用中,目标物质的测量可能会受到燃烧环境中背景热辐射、固体或液体颗粒引起的消光以及其他干扰吸收等因素的影响。在这项工作中,我们开发了一种基于波长对的差分吸收诊断技术,利用 3.3 μm 附近的带间级联激光同时测量碳氢化合物火焰中的温度和 C2H4 浓度。根据对该区域 C2H4 光谱的详细研究,并考虑到光谱线的最佳标准,选择了两个波长对。温度由两个波长对的吸收截面之比确定,C2H4 浓度则根据吸收差值较大的波长对推断。在初始阶段,该系统的准确性在高温静态条件下(T = 300-800 K,P = 1 atm)得到了验证,连续的时间序列测量证明了该系统的稳定性。通过 Allan-Werle 方差分析,在最佳平均时间 100 秒时的检测限为 2.5 ppm。测量结果表明,火焰中的测量温度与参考值之间的平均偏差为 1.021%,浓度测量的标准偏差为 1.381%。所有测量结果表明,该系统可用于燃烧诊断。
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来源期刊
CiteScore
5.70
自引率
12.10%
发文量
400
审稿时长
67 days
期刊介绍: The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.
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