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使用宽带紫外吸收和激光诱导荧光定量检测燃烧环境中的 SO。

Quantitative SO Detection in Combustion Environments Using Broad Band Ultraviolet Absorption and Laser-Induced Fluorescence.

机构信息

Division of Combustion Physics , Lund University , P.O. Box 118, Lund SE-221 00 , Sweden.

出版信息

Anal Chem. 2019 Aug 20;91(16):10849-10855. doi: 10.1021/acs.analchem.9b02505. Epub 2019 Aug 8.

DOI:10.1021/acs.analchem.9b02505
PMID:31364841
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6776380/
Abstract

Spectrally resolved ultraviolet (UV) absorption cross sections of SO in combustion environments at temperatures from 1120 to 1950 K were measured for the first time in well-controlled conditions through applying broad band UV absorption spectroscopy in specially designed one-dimensional laminar flat flames. The temperature was observed to have a significant effect on the absorption cross-section profiles at wavelength shorter than 260 nm, while at the longer wavelength side, the absorption cross-section profiles have much less dependence on temperature. The absorption cross section at 277.8 nm with a value of 0.68 × 10 cm/molecule was suggested for the evaluation of the SO concentration because of the weak dependence on temperature. To make spatially resolved measurements, laser-induced fluorescence (LIF) of SO excited by a 266 nm laser was investigated. Spectrally resolved LIF signal was analyzed at different temperatures. The LIF signal showed strong dependence on temperature, which can potentially be used for temperature measurements. At elevated temperatures, spatially resolved LIF SO detection up to a few ppm sensitivity was achieved. Combining UV broad band absorption spectroscopy and LIF, highly sensitive and spatially resolved quantitative measurements of SO in the combustion environment can be achieved.

摘要

首次在温度为 1120 至 1950 K 的受控条件下，通过在特别设计的一维层流平面火焰中应用宽带紫外吸收光谱法，测量了燃烧环境中 SO 的光谱分辨紫外（UV）吸收截面。结果表明，温度对波长小于 260nm 的吸收截面轮廓有显著影响，而在较长波长侧，吸收截面轮廓对温度的依赖性要小得多。由于对温度的依赖性较弱，建议在 277.8nm 处使用 0.68×10cm/mol 的吸收截面来评估 SO 浓度。为了进行空间分辨测量，研究了用 266nm 激光激发的 SO 的激光诱导荧光（LIF）。在不同温度下分析了光谱分辨的 LIF 信号。LIF 信号强烈依赖于温度，这可能可用于温度测量。在较高温度下，实现了高达几 ppm 灵敏度的空间分辨 LIF SO 检测。结合紫外宽带吸收光谱法和 LIF，可以实现燃烧环境中 SO 的高灵敏度和空间分辨定量测量。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/5bfaa62bbd47/ac9b02505_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/16a922e44836/ac9b02505_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/4317e53a0dc0/ac9b02505_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/f2801848a2a6/ac9b02505_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/34e37bb99035/ac9b02505_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/58f9969669e1/ac9b02505_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/697f80e928f3/ac9b02505_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/57a78e4fcf43/ac9b02505_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/92e3c57cab4e/ac9b02505_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/3913e827d75f/ac9b02505_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/5bfaa62bbd47/ac9b02505_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/16a922e44836/ac9b02505_0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/4317e53a0dc0/ac9b02505_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/f2801848a2a6/ac9b02505_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/34e37bb99035/ac9b02505_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/58f9969669e1/ac9b02505_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/697f80e928f3/ac9b02505_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/57a78e4fcf43/ac9b02505_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/92e3c57cab4e/ac9b02505_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/3913e827d75f/ac9b02505_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/0ee5/6776380/5bfaa62bbd47/ac9b02505_0010.jpg

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