Title :
Examination of objects made of wood using air-coupled ultrasound
Author :
Fortunko, C.M. ; Renken, M.C. ; Murray, A.
Author_Institution :
Nat. Inst. of Stand. & Technol., Boulder, CO, USA
Abstract :
The authors describe an experimental air-coupled, ultrasonic measurement system that can be used to study the propagation of megahertz signals in wooden plates ranging in thickness from 3 to 25 mm. They also report experimental measurements of the amplitude of transmitted, narrowband, 0.5-MHz signals as a function of the angle of incidence for different grain orientations. They compare the experimental results for balsa and poplar with results obtained on plates made of polymethyl methacrylate (PMMA). They interpret the results using a slowness-surface approach
Keywords :
ultrasonic materials testing; wood; 3 to 25 mm; air-coupled; angle of incidence; balsa; grain orientations; objects; polymethyl methacrylate; poplar; slowness-surface approach; thickness; ultrasonic measurement system; wood; wooden plates; Acoustic materials; Acoustic measurements; Acoustic signal detection; Acoustic waves; Piezoelectric transducers; Surface acoustic waves; Thickness measurement; Ultrasonic imaging; Ultrasonic transducers; Ultrasonic variables measurement;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171532
