Nondestructive evaluation of veneer quality using acoustic wave measurements |
| |
Authors: | J Wang J M Biernacki F Lam |
| |
Institution: | (1) Department of Wood Science, University of British Columbia, Vancouver, B. C., Canada V6T 1Z4, CA |
| |
Abstract: | Two nondestructive evaluation methods, impact-induced stress wave techniques and ultrasonics, were investigated to detect
lathe checks and knots in veneer, which were identified as key veneer quality properties for some engineered applications.
Measurements included wave velocity and attenuation in the directions parallel and perpendicular to the grain. The results
showed that both techniques were sensitive to lathe checks when using wave propagation perpendicular to grain. For wave transmission
parallel to grain, signals showed some sensitivity to knots. There was no significant difference in wave velocity measurements
between stress wave and ultrasonic techniques. Regression models based on stress wave velocities in these two orthogonal directions
were developed to estimate the veneer quality index giving a coefficient of determination ranging between 0.39 and 0.50.
Received: 20 December 1998 |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|