Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy
Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy
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DOI：
10.1063/1.2840719
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发表时间：
2008-02-04
影响因子：
4
通讯作者：
Pepper, M.
中科院分区：
文献类型：
--
作者：
Shen, Y. C.;Taday, P. F.;Pepper, M.
在颗粒状材料的太赫兹光谱中经常观察到光谱畸变。光谱学中的这些寄生结构是由于颗粒与其周围介质之间的折射率失配引起的散射引起的。我们发现，散射的贡献是随机的样品位置，并可以通过求和和平均多个测量样品面积消除。本文给出了尺寸在50-250 μ m范围内的吸收粒子和非吸收粒子的实验结果，并给出了描述粒子尺寸对散射消光效应随频率变化的经验表达式。(C)2008年美国物理学会。
Spectral distortions are commonly observed in terahertz spectra of granulated materials. These spurious structures in the spectroscopy are caused by scattering due to the refractive index mismatch between the particles and their surrounding medium. We find that the scattering contribution is random across sample positions and could be eliminated by summing and averaging multiple measurements over a sample area. We present experimental results of both absorbing and nonabsorbing particles in the size range 50-250 mu m and also give an empirical expres-sion to describe the effect of grain size on the scattering-induced extinction as a function of frequency. (C) 2008 American Institute of Physics.