Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine (2017)
Background: Measurement of microfibril angle (MFA) in the S2 layer of the cell walls of wood using speed of sound in wood has become a common way to estimate wood stiffness and stability. Measurements across the radius of a disc can be critical, but sonic testing needs to be validated against direct measurements of MFA. Methods: A robotic machine that uses two transducers to detect the speed of sound through discs of wood from tree stems was validated by comparing its measurements with wood MFA, air-dry density, and modulus of elasticity assessed by X-ray diffractometry through the “Silviscan” system. Results: Ultrasonic velocity (USV) was highly correlated with MFA but not with air-dry density. Variable moving averages were assessed in order to estimate the resolution of the USV measurements, and it appeared that the diameter of the swath detected by the transducers was between 23 and 30 mm. Conclusions: It was concluded that MFA in wood samples can be assessed rapidly and cheaply using USV measurements but at lower resolution than assessments using X-ray diffractometry.
CitationMason EG, Hayes MP, Pink N (2017). Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine. NZ Journal of Forestry Science. 47(16).
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KeywordsWood quality; Microfibril angle; Wood density; Modulus of elasticity
ANZSRC Fields of Research30 - Agricultural, veterinary and food sciences::3007 - Forestry sciences::300708 - Forestry product quality assessment
Rights© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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