Non-destructive method and apparatus for checking the quality of manufactured wood panels

Abstract From the Canadian patent

Method and apparatus for non-destructive testing the quality of manufactured wood panels which includes supporting the panel so as to have a portion thereof is cantilevered fashion. The cantilevered portion of the panel is caused to vibrate so as to include complex vibrations that include both twisting and bending. The vibrations in the panel are sensed providing an output signal that is fed to analyzers and computers to determined from thee bending and twisting vibrations simultaneously induced respectively the modulus of elasticity and shear modulus of the panel. Two different forms of apparatus are illustrated, one of which requires the panel to be stationary while being tested and the …