Extracting Wood Properties From Structured THz Spectra: Birefringence and Water Content

被引：25

作者：

Zolliker, Peter ^{[1
]}

Rueggeberg, Markus ^{[2
,3
]}

Valzania, Lorenzo ^{[1
]}

Hack, Erwin ^{[1
]}

机构：

[1] Empa, Lab Transport Nanoscale Interfaces, CH-8600 Dubendorf, Switzerland

[2] Empa, Lab Appl Wood Mat, CH-8600 Dubendorf, Switzerland

[3] ETH, Swiss Fed Inst Technol, Inst Bldg Mat, CH-8092 Zurich, Switzerland

来源：

IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY | 2017年 / 7卷 / 06期

基金：

瑞士国家科学基金会;

关键词：

Birefringence; humidity; terahertz (THz) spectroscopy; water content; wood; TIME-DOMAIN SPECTROSCOPY; LIQUID WATER; TERAHERTZ; DENSITY; FREQUENCIES; ABSORPTION; CELLULOSE; MOISTURE;

D O I：

10.1109/TTHZ.2017.2755508

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Transmission terahertz (THz) spectroscopy on heterogeneous materials often shows structured spectra due to interference of waves passing through the object along different optical paths. Of special interest is wood with its strong birefringence and pronounced orientation-dependent structure. In this paper, we show that at specific polarization angles, the THz transmission spectra show gaps at distinct frequencies. The frequency changes of these gaps can be used for a fast and accurate determination of the dependence of birefringence on humidity. We present results for spruce and beech with different sample thicknesses and orientations, and study and model their optical properties as a function of water content.

引用

页码：722 / 731

页数：10

共 20 条

[1] MEASUREMENTS OF OPTICAL-CONSTANTS OF LIQUID H2O AND D2O BETWEEN 6 AND 450 CM-1 [J].

AFSAR, MN ;

HASTED, JB .

JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, 1977, 67 (07) :902-904

[2]

[Anonymous], 2003, SENSING TERAHERTZ RA

[3]

Choy T. C., 2016, International Series of Monographs on Physics, V165

[4] Review of Moisture and Liquid Detection and Mapping using Terahertz Imaging [J].

Federici, John F. .

JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, 2012, 33 (02) :97-126

[5] Catalogue of human tissue optical properties at terahertz frequencies [J].

Fitzgerald, AJ ;

Berry, E ;

Zinov'ev, NN ;

Homer-Vanniasinkam, S ;

Miles, RE ;

Chamberlain, JM ;

Smith, MA .

JOURNAL OF BIOLOGICAL PHYSICS, 2003, 29 (2-3) :123-128

[6] Colours in metal glasses and in metallic films. [J].

Garnett, JCM .

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-CONTAINING PAPERS OF A MATHEMATICAL OR PHYSICAL CHARACTER, 1904, 203 :385-420

[7] Measurements of leaf water content using terahertz radiation [J].

Hadjiloucas, S ;

Karatzas, LS ;

Bowen, JW .

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, 1999, 47 (02) :142-149

[8] Simultaneous prediction of density and moisture content of wood by terahertz time domain spectroscopy [J].

Inagaki, Tetsuya ;

Ahmed, Belal ;

Hartley, Ian D. ;

Tsuchikawa, Satoru ;

Reid, Matthew .

JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, 2014, 35 (11) :949-961

[9] Investigation of aqueous alcohol and sugar solutions with reflection terahertz time-domain spectroscopy [J].

Jepsen, Peter Uhd ;

Moller, Uffe ;

Merbold, Hannes .

OPTICS EXPRESS, 2007, 15 (22) :14717-14737

[10] Investigation of the water absorption in polyamide and wood plastic composite by terahertz time-domain spectroscopy [J].

Joerdens, C. ;

Wietzke, S. ;

Scheller, M. ;

Koch, M. .

POLYMER TESTING, 2010, 29 (02) :209-215

← 1 2 →