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高灵敏度、无定标全内反射微分吸收光谱法（WM-DAS）用于吸收恢复的方法研究：实验分析。

Highly Sensitive, Calibration-Free WM-DAS Method for Recovering Absorbance-Part II: Experimental Analysis.

机构信息

State Key Laboratory of Power Systems, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China.

出版信息

Sensors (Basel). 2020 Jan 22;20(3):616. doi: 10.3390/s20030616.

DOI:10.3390/s20030616
PMID:31979159
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7038228/
Abstract

Following the theoretical work in Part I, in this experimental study, the robustness, temporal resolution, and the narrow scan performance of the proposed wavelength modulation-direct absorption spectroscopy (WM-DAS) method are experimentally validated in a high-temperature tube furnace. The electromagnetic and other random-frequency noises can be effectively eliminated by extracting the characteristic spectra of the light intensity. The performance of WM-DAS with modulation frequencies from 0.1 to 100 kHz and scan indexes from 3.3 to 11.1 are also investigated at atmospheric pressure. The proposed method produces accurate line profile and high SNR over 500 consistently even with a weak absorption. As for real applications, the spectral line parameters of CO at 4300.6999 cm including the collisional broadening, Dicke narrowing, and their dependence on temperature are measured. Furthermore, the high-speed measurement (1 ms) of the temperature and CO concentration of a McKenna flat flame are demonstrated.

摘要

在第一部分的理论工作之后，在这项实验研究中，我们在高温管式炉中对所提出的波长调制直接吸收光谱（WM-DAS）方法的稳健性、时间分辨率和窄扫描性能进行了实验验证。通过提取光强的特征光谱，可以有效地消除电磁和其他随机频率噪声。我们还在常压下研究了调制频率为 0.1 到 100 kHz 以及扫描指标为 3.3 到 11.1 的 WM-DAS 的性能。即使在弱吸收的情况下，该方法也能产生准确的线轮廓和高信噪比，超过 500 。对于实际应用，我们测量了 CO 在 4300.6999 cm 处的光谱线参数，包括碰撞展宽、Dicke 变窄以及它们对温度的依赖性。此外，还演示了 McKenna 平板火焰的高速测量（1 ms），包括温度和 CO 浓度。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/dc77126b5c1c/sensors-20-00616-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/df79fa5b1eb8/sensors-20-00616-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/9940a44a86a1/sensors-20-00616-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/747efb33b9e3/sensors-20-00616-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/f48cf2053c7a/sensors-20-00616-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/f2ca3e56fcdc/sensors-20-00616-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/5462087a2105/sensors-20-00616-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/ff16b64276a6/sensors-20-00616-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/a8745e868240/sensors-20-00616-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/706918c81a17/sensors-20-00616-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/cc5e02033009/sensors-20-00616-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/704cfda254e8/sensors-20-00616-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/55c786261fff/sensors-20-00616-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/dc77126b5c1c/sensors-20-00616-g013.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/df79fa5b1eb8/sensors-20-00616-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/9940a44a86a1/sensors-20-00616-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/747efb33b9e3/sensors-20-00616-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/f48cf2053c7a/sensors-20-00616-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/f2ca3e56fcdc/sensors-20-00616-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/5462087a2105/sensors-20-00616-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/ff16b64276a6/sensors-20-00616-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/a8745e868240/sensors-20-00616-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/706918c81a17/sensors-20-00616-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/cc5e02033009/sensors-20-00616-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/704cfda254e8/sensors-20-00616-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/55c786261fff/sensors-20-00616-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/609c/7038228/dc77126b5c1c/sensors-20-00616-g013.jpg

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本文引用的文献

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A high-accurate and universal method to characterize the relative wavelength response (RWR) in wavelength modulation spectroscopy (WMS).一种用于表征波长调制光谱法（WMS）中相对波长响应（RWR）的高精度通用方法。
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Highly Sensitive, Calibration-Free WM-DAS Method for Recovering Absorbance-Part I: Theoretical Analysis.用于恢复吸光度的高灵敏度、免校准WM-DAS方法——第一部分：理论分析
Sensors (Basel). 2020 Jan 26;20(3):681. doi: 10.3390/s20030681.
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Novel method for quantitative and real-time measurements on engine combustion at varying pressure based on the wavelength modulation spectroscopy.基于波长调制光谱技术的变压下发动机燃烧定量实时测量新方法。
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