Evaluation of a curve-fitting method for diffuse reflectance spectra in the UV–Visible–NIR wavelength region
Evaluation of a curve-fitting method for diffuse reflectance spectra in the UV–Visible–NIR wavelength region
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DOI：
10.1016/j.polar.2009.06.004
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发表时间：
2009-09
期刊：
影响因子：
1.8
通讯作者：
M. Miyamoto;T. Arai;M. Komatsu;A. Yamamoto;T. Mikouchi
中科院分区：
文献类型：
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作者：
M. Miyamoto;T. Arai;M. Komatsu;A. Yamamoto;T. Mikouchi
Sunshine等人提出的修正高斯方法（MGM）。[阳光，J.M.，Pieters，C.M.，普拉特，S.F.，1990.矿物吸收谱带的去卷积：一种改进的方法。地球物理研究杂志95，6955-6966。通常用于将UV-可见光-NIR波长区域中的光谱分解成矿物的特征吸收带。在这里，我们比较了使用不同的曲线拟合方法获得的优化结果。使用高斯函数获得的吸收带的结果显示出比使用洛伦兹函数获得的结果更好的拟合。波数的二次多项式的背景连续提供了比波数的线性函数更好的结果。我们成功地将普通橄榄石和钙钛矿的光谱分解为橄榄石和辉石的吸收带。这些吸收带的波长位置与橄榄石和辉石的铁含量大致一致。虽然目前的结果是来自有限数量的光谱，它们是使用的漫反射光谱的分解。
The Modified Gaussian Method (MGM) proposed by Sunshine et al. [Sunshine, J.M., Pieters, C.M., Pratt, S.F., 1990. Deconvolution of mineral absorption bands: an improved approach. Journal of Geophysical Research 95, 6955–6966.] is generally used to decompose spectra in the UV–Visible–NIR wavelength region into the characteristic absorption bands of minerals. Here, we compare the optimized results obtained using different curve-fitting methods for this spectrum. The result obtained using the Gaussian function for the absorption band shows a better fit than that obtained using the Lorentzian function. The background continuum of a quadratic polynomial for the wavenumber provides a better result than does the linear function for the wavenumber. We successfully decomposed the spectra of ordinary chondrites and eucrites into the absorption bands of olivine and pyroxene. The wavelength positions of these absorption bands are broadly consistent with the Fe contents of olivine and pyroxene. Although the present results are derived from a limited number of spectra, they are of use in terms of the decomposition of diffuse reflectance spectra.