Dielectric measurement of logs for improved internal imaging

Author

Holmes, Wayne S. ; Rehman, Saeed Ur ; Riley, Steve

Author_Institution

Dept. of Electrotechnol., Unitec Inst. of Technol., Auckland, New Zealand

fYear

2011

fDate

Nov. 28 2011-Dec. 1 2011

Firstpage

202

Lastpage

206

Abstract

This paper describes the measurement of the dielectric properties of the typical log features of Heartwood, Sapwood and internal Branches. Measurements were made using the waveguide cell technique covering the frequency range of 2.3 to 6.5GHz. This has shown that for the desired contrast between heartwood and Sapwood to be achieved the imaging system must operate above 4GHz. Additional work was undertaken to establish a method to correct these measurements for variations in basic density and EarlywoodLatewood banding, giving rise to a potential moisture content estimation error of 0.63%. This will lead to improved spatial location of features of interest.

Keywords

measurement errors; microwave imaging; permittivity measurement; wood; Earlywood-Latewood bonding; Heartwood; Sapwood; dielectric property measurement; frequency 2.3 GHz to 6.5 GHz; internal branch; internal imaging; logs; moisture content estimation error; waveguide cell technique; Microwave imaging; Microwave measurements; Microwave theory and techniques; Moisture; Permittivity; Permittivity measurement; basic density; dielectric; imaging; log;

fLanguage

English

Publisher

ieee

Conference_Titel

Sensing Technology (ICST), 2011 Fifth International Conference on

Conference_Location

Palmerston North

ISSN

2156-8065

Print_ISBN

978-1-4577-0168-9

Type

conf

DOI

10.1109/ICSensT.2011.6136965

Filename

6136965