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首页> 外文学位 >Spectroscopic study of channel spectra phenomena in the synchrotron-based FTIR spectrometer at the Canadian Light Source.
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Spectroscopic study of channel spectra phenomena in the synchrotron-based FTIR spectrometer at the Canadian Light Source.

机译：在加拿大光源的基于同步加速器的FTIR光谱仪中对通道光谱现象的光谱学研究。

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摘要

Recently, the high radiance of synchrotron sources was used to enhance FTIR spectrometer performance. However, excessive channel spectra when synchrotron sources are used degrade the quality of retrieved spectral parameters. In the research reported in this thesis, seven different techniques for handling channel spectra were investigated. These techniques were used to reduce channel spectra for a test group of seven samples of CO2 mixed with air recorded using the synchrotron source at the Canadian Light Source. The increases in signal to noise ratio (SNR) of spectra handled with each technique were calculated. SNR results showed that transmission spectra, produced using synthetic background spectra with simulated channel spectra, achieved the highest SNR improvement. However, when the spectra groups were fitted using nonlinear least square fit algorithm, the technique using channel spectra fitting produced the smallest fitting residual. Moreover, the retrieved intensities and air broadening coefficients of 21 spectral lines showed that the spectral fitting technique produced the most accurate values as compared to the HITRAN 2008 database. Although the spectral fitting technique was accurate in retrieving spectral line parameters, applying the technique at wider spectral ranges was less accurate.;A modification to the channel spectra fitting technique by performing iterations of channel fitting was introduced to process wider spectral ranges. Carbon dioxide laser band I centred at 961 wavenumber was analyzed using 24 spectra recorded under different experimental conditions. The intensity and air- and self-broadening coefficients were retrieved for 48 spectral lines with average deviations from HITRAN database values of 2.11%, 1.25% and 4.14%, respectively, using the Voigt profile. These average deviations lie within the uncertainty limits listed by the database. The deviation between our results and other results reported in the literature were also examined and it is found to be also within the range of HITRAN uncertainties. The effect of errors in fitting channel spectra parameters was examined and found to be mitigated by the inclusion of channel-free spectra in the multispectral fit.
机译：最近，同步辐射源的高辐射度被用于增强FTIR光谱仪的性能。但是，当使用同步加速器源时，过多的通道光谱会降低检索到的光谱参数的质量。在本文报道的研究中，研究了七种不同的处理信道频谱的技术。这些技术被用于减少一个测试组的信道光谱，该测试组包含七个在加拿大光源使用同步加速器源记录的与空气混合的二氧化碳样品。计算了每种技术处理的频谱的信噪比（SNR）的增加。 SNR结果表明，使用合成背景光谱和模拟通道光谱生成的透射光谱实现了最高的SNR改善。但是，当使用非线性最小二乘拟合算法拟合光谱组时，使用通道光谱拟合的技术会产生最小的拟合残差。此外，检索到的21条谱线的强度和空气展宽系数表明，与HITRAN 2008数据库相比，光谱拟合技术产生了最准确的值。尽管光谱拟合技术在检索光谱线参数方面是准确的，但在较宽的光谱范围内应用该技术的准确性较差。使用在不同实验条件下记录的24个光谱分析了以961波数为中心的二氧化碳激光带I。使用Voigt剖面图，检索了48条谱线的强度，空气和自增宽系数，其与HITRAN数据库值的平均偏差分别为2.11％，1.25％和4.14％。这些平均偏差在数据库列出的不确定性范围内。我们的结果与文献中报道的其他结果之间的偏差也得到了检验，发现其也在HITRAN不确定性范围内。检查了拟合通道光谱参数中误差的影响，发现通过在多光谱拟合中包含无通道光谱可以减轻这种影响。

著录项

  • 作者

    Ibrahim, Amr.;

  • 作者单位

    University of Lethbridge (Canada).;

  • 授予单位 University of Lethbridge (Canada).;
  • 学科 Astronomy.
  • 学位 M.Sc.
  • 年度 2011
  • 页码 134 p.
  • 总页数 134
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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