Abstract
The physical properties of wood are of interest in a wide range of applications, including biology, climate science, and civil engineering. Its orthotropic nature poses considerable challenges in assessing the fully three-dimensional properties of wood. Laser ultrasonic waveforms of Radiata Pine of differing quality illustrate opportunities to extract its angle-dependent physical properties. We present a newly-derived Modified Hankinson Equation that improves the fit to the observed angle-dependence of wave speed in the higher quality sample by almost a factor of 3 to the original Hankinson Equation. Wave forms in the lower quality sample detect small-scale heterogeneity (due to pith, in this case), based on variations in ultrasonic wave speed and attenuation.
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