By Topic

Theory and practice in measuring wood grain angle using microwaves

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Jianping Shen ; Dept. of Mech. Eng., British Columbia Univ., Vancouver, BC, Canada ; G. Schajer ; R. Parker

Knowledge of wood grain inclination is critical for achieving improved lumber strength grading. This paper describes an instrumentation system and theory for using microwaves to measure wood grain angle in real time. By using an electrically modulated scattering dipole with a homodyne microwave system, it is found both theoretically and experimentally that the amplitude reading of the modulated scattered signal provides an excellent means far measuring wood grain angle. In addition, the phase output of the system can be used to identify the sign of the grain angle. Two widely used wood species, Douglas Fir and Spruce, are measured at different moisture levels to verify the theoretical prediction experimentally. Preliminary data analysis shows that reliable measurement of grain angles up to about 30° can be made for wood within a wide range of specific gravity and moisture content. Through the experimental measurements, the potential of such a system for industrial use is demonstrated

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:43 ,  Issue: 6 )