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首页> 外文会议>Algorithms and technologies for multispectral, hyperspectral, and ultraspectral imagery XX >The Influence of Particle Size on Infrared Reflectance Spectra
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The Influence of Particle Size on Infrared Reflectance Spectra

机译：粒径对红外反射光谱的影响

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Reflectance spectra of solids are influenced by the absorption coefficient and index of refraction as well as particle size and morphology. In the infrared, spectral features may be observed as either maxima or minima: in general, the upward-going peaks in the reflectance spectrum result from surface scattering, which are rays that have reflected from the surface without penetration, whereas downward-going peaks result from either absorption or volume scattering, i.e. rays that have penetrated into the sample to be absorbed or refracted into the sample interior and are not reflected. The light signal reflected from solids usually encompasses all these effects which include dependencies on particle size, morphology and sample density. This paper measures the reflectance spectra in the 1.3 - 16 micron range for various bulk materials that have a combination of strong and weak absorption bands in order to understand the effects on the spectral features as a function of the mean grain size of the sample. The bulk materials were ground and sieved to separate the samples into various size fractions: 0-45, 45-90, 90-180, 180-250, 250-500, and ＞500 microns. The directional-hemispherical spectra were recorded using a Fourier transform infrared spectrometer equipped with an integrating sphere to measure the reflectance for all of the particle-size fractions. We have studied both organic and inorganic materials, but this paper focuses on inorganic salts, NaNO_3, in particular. Our studies clearly show that particle size has an enormous influence on the measured reflectance spectra for bulk materials and that successful identification requires sufficient representative reflectance data so as to include the particle size(s) of interest. Origins of the effects are discussed.
机译：固体的反射光谱受吸收系数和折射率以及粒径和形态的影响。在红外中，可以观察到的光谱特征为最大值或最小值：通常，反射光谱中的上行峰是由表面散射产生的，表面散射是从表面反射而没有穿透的光线，而下行峰是吸收或体积散射引起的散射，即已渗透到样品中以被吸收或折射到样品内部且未被反射的射线。从固体反射的光信号通常包含所有这些影响，包括对粒度，形态和样品密度的依赖性。本文测量了具有强吸收带和弱吸收带的各种散装材料在1.3-16微米范围内的反射光谱，以了解作为样品平均粒度的函数对光谱特征的影响。将散装物料研磨并过筛，将样品分成各种尺寸部分：0-45、45-90、90-180、180-250、250-500和> 500微米。使用配备有积分球的傅立叶变换红外光谱仪记录定向半球光谱，以测量所有粒度级分的反射率。我们已经研究了有机材料和无机材料，但本文重点研究了无机盐NaNO_3。我们的研究清楚地表明，粒径对散装材料的测量反射光谱有很大的影响，成功的鉴定需要足够的代表性反射率数据，以便包括感兴趣的粒径。讨论了影响的起源。

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