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首页> 外文会议>Air Waste Management Association's Annual conference Exhibition >PARTICULATE MATTER MEASUREMENTS USING OPEN-PATH FOURIER TRANSFORM INFRARED SPECTROSCOPY
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PARTICULATE MATTER MEASUREMENTS USING OPEN-PATH FOURIER TRANSFORM INFRARED SPECTROSCOPY

机译：使用开放式傅里叶变换红外光谱法测量颗粒物质测量

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Open-path Fourier transform infrared (OP-FTIR) spectroscopy is a well-accepted technology designed for measuring gaseous air contaminants. OP-FTIR absorbance spectra acquired during changing aerosol conditions reveal related changes in very broad baseline features. Usually this "shearing" of a spectrum's baseline is viewed as undesirable because it interferes with quantifying gases. However, this paper demonstrates that this wavelength-dependent absorbance can be used to measure particulate matter (PM). A developed inversion algorithm for retrieving the size distribution of the PM in the beam path is described. This paper presents preliminary results from OP-FTIR measurements conducted downwind from an active dirt road. Using the developed inversion algorithm and measured optical properties, the calculated extinction spectra were fitted to the measured extinction by using the Mie theory for spherical particles. Time series data reveal significant rapid shifts in size distribution of the PM in the OP-FTIR. Results indicate that size distribution parameters may be retrieved from OP-FTIR spectra acquired over an open optical path. The suggested method may provide real-time concentrations of gaseous and PM contaminants simultaneously. Emission flux estimates of PM may be generated for near-ground-level line (roads) and area sources when several beam paths are deployed downwind from the source.
机译：开放式傅立叶变换红外（OP-FTIR）光谱是一种专为测量气态空气污染物而设计的良好的技术。在改变气溶胶条件期间获得的OP-FTIR吸光度光谱显示出非常广泛的基线特征中的相关变化。通常，光谱基线的这种“剪切”被视为不希望的，因为它会干扰量化气体。然而，本文证明这种波长依赖性吸光度可用于测量颗粒物质（PM）。描述了用于检索光束路径中PM的大小分布的发达的反演算法。本文提出了从活性污垢道路中排水的OP-FTIR测量的初步结果。使用开发的反转算法和测量光学性质，通过使用MIE理论用于球形颗粒，计算出计算的消光光谱。时间序列数据显示了OP-FTIR中PM的大小分布的显着快速变化。结果表明可以从开放光路上获取的OP-FTIR光谱检索大小分布参数。建议的方法可以同时提供气态和PM污染物的实时浓度。当几个光束路径从源部署下行时，可以为近地级线（道路）和区域来源产生PM的发射磁通估计。

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