This book on nondestructive evaluation (NDE) of wood was prepared at the request of our colleaguesthroughout the world who expressed the desire for a synthesized source of information on the subject.We have attempted to meet their needs through this book.We contacted several widely respected technical authorities and asked them to prepare chapters dealingwith their areas of expertise. Professor Frank Beall (University of California-Berkeley), BrianBrashaw (University of Minnesota-Duluth), Kevin Cheung (Western Wood Products Association), Bill Galligan (retired, Frank Lumber Company), John Kearns (Weyerhaeuser Company), and XipingWang (University of Minnesota-Duluth) responded positively to our request and prepared excellentchapters on acoustic emission/acousto-ultrasonics, ultrasonic veneer grading, visual grading of lumber, mechanical grading of lumber, and recent research on NDE of green materials, respectively.Sections of the book originally appeared in technical journals, research reports, and various symposiaproceedings. We have included, for example, a chapter on inspection of timber structures that originallyappeared as a research paper, which was widely distributed and used by engineering consultantswho inspect structures as a part of their business.We prepared this book to serve as a primary reference on NDE of wood. More than 400 technicalarticles are cited in the chapters or listed in the Appendix. We also intended it to be used as a primeror handbook on several widely used NDE technologies. The chapters on machine grading of lumber, ultrasonic veneer grading, and inspection of wood in service were written to provide a concise sourceof information to manufacturers and users of wood products who are considering use of various commerciallyavailable NDE technologies in their manufacturing operation or consulting business.This book was made possible through the efforts of dedicated scientists who spent countless hours inlaboratories developing our technical knowledge base on NDE of wood.Roy F. PellerinRobert J. R
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