Dual-gas sensor for ultra-close overlapping spectra based on second harmonic peak shift

IF 8 1区 化学 Q1 CHEMISTRY, ANALYTICAL
Huifang Gao , Qing Yang , Qianjin Wang , Zhirong Zhang , Yuangang Lu , Le Wang
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Abstract

In spectral absorption techniques, overlapping spectra cause distortion in absorption line heights, leading to inaccuracies in concentration measurements, which poses a significant challenge for measuring multi-component gases. In this paper, an innovative method that utilizes the displacement of the second harmonic (2f) peak to mitigate 2f height errors resulting from cross-interference is presented. Our research findings reveal that cross-interference distorts symmetrical absorption spectra, and by adjusting the modulation depth, a predictable shift in the 2f peak can be induced, with the magnitude of this shift directly correlated to the concentration of the interfering gas. This discovery enables us to correct 2f height errors, thereby enabling precise concurrent analysis of multi-component gases while mitigating the effects of cross-interference. This approach holds promise in addressing the challenge of accurate dual-parameter gas measurement in scenarios of ultra-close spectral overlap. In a proof-of-concept experiment, we selected C2H2 and CO2 (two gases with closely spaced and overlapped absorption spectra) as example gases for detection. Notably, this method achieved high-precision measurements with an accuracy of 27 ppb for C2H2 and 5 ppm for CO2 when dealing with ultra-close spectra of 1 ppm C2H2 and 4350 ppm CO2, whose centerline offset is merely 0.0859 cm−1. This represents a 15-fold improvement in measurement accuracy for C2H2. The minimum detection limits for C2H2 and CO2 are 3.2 ppb and 13.6 ppm, respectively. Furthermore, this work offers a novel solution to mitigate cross-interference, demonstrating good versatility for application in other absorption spectroscopy techniques without additional costs or structural changes.
基于二次谐波峰移的超近重叠光谱双气体传感器
在光谱吸收技术中,光谱重叠会引起吸收线高度的畸变,从而导致浓度测量的不准确性,这对测量多组分气体提出了重大挑战。本文提出了一种利用二次谐波(2f)峰值位移来减轻交叉干扰引起的2f高度误差的创新方法。我们的研究结果表明,交叉干扰会扭曲对称吸收光谱,通过调节调制深度,可以诱导2f峰发生可预测的移位,这种移位的大小与干扰气体的浓度直接相关。这一发现使我们能够纠正2f高度误差,从而能够精确地同时分析多组分气体,同时减轻交叉干扰的影响。这种方法有望解决在超近谱重叠情况下精确测量双参数气体的挑战。在概念验证实验中,我们选择了C2H2和CO2(两种具有紧密间隔和重叠吸收光谱的气体)作为示例气体进行检测。值得注意的是,当处理1 ppm C2H2和4350 ppm CO2的超接近光谱时,该方法实现了高精度测量,C2H2的精度为27 ppb, CO2的精度为5 ppm,其中心线偏移仅为0.0859 cm−1。这表示C2H2的测量精度提高了15倍。C2H2和CO2的最低检出限分别为3.2 ppb和13.6 ppm。此外,这项工作提供了一种新的解决方案来减轻交叉干扰,证明了在其他吸收光谱技术中应用的良好通用性,而不需要额外的成本或结构改变。
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来源期刊
Sensors and Actuators B: Chemical
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.
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