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Would you like to add information to this article? Interested in writing or submitting an article? Have a question about this article? A microwave method for measuring moisture content, density, and grain angle of wood       The attenuation, phase shift and depolarization of a polarized 4.81-gigahertz wave as it is transmitted through a wood specimen can provide estimates of the moisture content (MC), density, and grain angle of the specimen. Calibrations are empirical, and computations are complicated, with considerable interaction between parameters. Measured dielectric parameters, however, correlate uniquely and repeatably with MC over a range of MC at least as great as 100 percent of the dry weight of the wood. Grain angle can be deduced reliably when the specimen thickness and MC are great enough to introduce sufficient dielectric anisotropy to appreciably depolarize the incident wave. At present, the apparatus and techniques are very complex, but the principles developed by this research show the method to be feasible for nondestructive testing of lumber as it is produced. This article is in PDF format (file size: 127 kb). To download this article, right click on the link immediately below and choose "save target as". To view the article, left click the link immediately below. (Download the latest Acrobat Reader if required.) A microwave method for measuring moisture content, density, and grain angle of wood   ( ) The attenuation, phase shift and depolarization of a polarized 4.81-gigahertz wave as it is transmitted through a wood specimen can provide estimates of the moisture content (MC), density, and grain angle of the specimen. Calibrations are empirical, and computations are complicated, with considerable interaction between parameters. Measured dielectric parameters, however, correlate uniquely and repeatably with MC over a range of MC at least as great as 100 percent of the dry weight of the wood. Grain angle can be deduced reliably when the specimen thickness and MC are great enough to introduce sufficient dielectric anisotropy to appreciably depolarize the incident wave. At present, the apparatus and techniques are very complex, but the principles developed by this research show the method to be feasible for nondestructive testing of lumber as it is produced. Author: James, W. L.; Yen, Y.-H.; King, R. J. Source: (Research note FPL ; 0250):9 p. ; 28 cm. Citation: James, W. L.; Yen, Y.-H.; King, R. J.  .  A microwave method for measuring moisture content, density, and grain angle of wood   (Research note FPL ; 0250):9 p. ; 28 cm.. Have you reviewed the related Knowledge Base areas below? KnowledgeBase: FPL (Forest Products Laboratory) KnowledgeBase: Forestry KnowledgeBase: FPL (Forest Products Laboratory) Would you like to add information to this article? ... Click Here If you have a question regarding a Knowledge Base article, your best chance at uncovering an answer is to search the entire Knowledge Base for related articles or to post your question at the appropriate WOODWEB Forum. Before posting your message, be sure to review our Forum Guidelines. Questions entered in the Knowledge Base Article comment form will not generate responses! A list of WOODWEB Forums can be found at WOODWEB's Site Map. When you post your question at the Forum, be sure to include references to the Knowledge Base article that inspired your question. The more information you provide with your question, the better your chances are of receiving responses. Return to beginning of article. Refer a Friend || Read This Important Information || Site Map || Privacy Policy Letters, questions or comments? E-Mail us and let us know what you think. Be sure to review our Frequently Asked Questions page. Contact us to discuss advertising or to report problems with this site. To report a problem, send an e-mail to our Webmaster Copyright © 1996-2008 - WOODWEB ® Inc. All rights reserved. No part of this publication may be reproduced in any manner without permission of the Editor. Review WOODWEB's Copyright Policy. The editors, writers, and staff at WOODWEB try to promote safe practices. What is safe for one woodworker under certain conditions may not be safe for others in different circumstances. Readers should undertake the use of materials and methods discussed at WOODWEB after considerate evaluation, and at their own risk. WOODWEB, Inc. RR4 Box 265A Montrose, PA 18801 Contact WOODWEB