Abstract

A number of noncontacting measurement techniques have been used to find and measure the extent of biological defects (knots, decay, etc.) in solid wood products. These include visible and laser light scanners, acoustic waves, microwaves, and gamma rays.¹ There would be a large benefit in automating the defecting function in a wide range of lumber and plywood applications where this function is now carried out by human observation and decision.

© 1983 Optical Society of America