Elimination of scattering effects in spectral measurement of granulated materials using terahertz pulsed spectroscopy

被引：116

作者：

Shen, Y. C. ^{[1
]}

Taday, P. F. ^{[2
]}

Pepper, M. ^{[2
]}

机构：

[1] Univ Liverpool, Dept Elect Engn & Elect, Liverpool L69 3GJ, Merseyside, England

[2] TeraView Ltd, Platinum Bldg, Cambridge CB4 0WS, England

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 05期

关键词：

D O I：

10.1063/1.2840719

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：3

共 20 条

[1] Terahertz spectroscopy [J].

Beard, MC ;

Turner, GM ;

Schmuttenmaer, CA .

JOURNAL OF PHYSICAL CHEMISTRY B, 2002, 106 (29) :7146-7159

[2]

Bohren C.F., 1998, ABSORPTION SCATTERIN

[3] Time resolved measurements which isolate the mechanisms responsible for terahertz glory scattering from dielectric spheres [J].

Cheville, RA ;

McGowan, RW ;

Grischkowsky, D .

PHYSICAL REVIEW LETTERS, 1998, 80 (02) :269-272

[4]

COATES J, 1997, APPL SPECTROSCOPY

[5] Material parameter estimation with terahertz time-domain spectroscopy [J].

Dorney, TD ;

Baraniuk, RG ;

Mittleman, DM .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 2001, 18 (07) :1562-1571

[6] Materials for terahertz science and technology [J].

Ferguson, B ;

Zhang, XC .

NATURE MATERIALS, 2002, 1 (01) :26-33

[7]

GARRETT RH, 1999, BIOCH, pCH1

[8] Characterizing individual scattering events by measuring the amplitude and phase of the electric field diffusing through a random medium [J].

Jian, ZP ;

Pearce, J ;

Mittleman, DM .

PHYSICAL REVIEW LETTERS, 2003, 91 (03)

[9] Direct observation of the Gouy phase shift in THz impulse ranging [J].

McGowan, RW ;

Cheville, RA ;

Grischkowsky, D .

APPLIED PHYSICS LETTERS, 2000, 76 (06) :670-672

[10] Propagation of terahertz pulses in random media [J].

Pearce, J ;

Jian, ZP ;

Mittleman, DM .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 2004, 362 (1815) :301-313

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