Literature reports have indicated that application of
sonic pressure waves enhances the rate of impregnation of
preservatives in wood. However, these studies have been
limited and inconclusive. The technique or process is not
in commercial use. In this study a laboratory scale
treating cylinder connected to a mechanical sonic wave...
The velocity of sound in gases was measured, using an ultrasonic
wave train as a diffraction grating. The fundamental problems
involved in the optical technique are discussed. An apparatus utilizing
an objective lens of focal length 1.5 m and aperture f/20 was constructed
and used at an ultrasonic frequency close...
Ultrasonic wave attenuation and velocity in the transverse direction were used to detect defects in ponderosa pine (Pinus Ponderosa) lumber previously dried from green to 9% moisture content. After ultrasonic testing the boards were visually inspected for defects and classified according to the defects present. An ANOVA with Bonferroni pairwise...
The application of laser generated ultrasonics was first
demonstrated in the mid-seventies and has shown good potential
when applied to isotropic materials. However, its use with
composite materials is still in the early stages of development.
This study explores the potential for application of laser
generated Rayleigh and Lamb waves...