Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine
Abstract 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 agains...
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Online Access: | http://link.springer.com/article/10.1186/s40490-017-0098-y |
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doaj-155054d2f0064622b797865f5ad591012020-11-24T22:10:41ZengScionNew Zealand Journal of Forestry Science1179-53952017-08-014711510.1186/s40490-017-0098-yValidation of ultrasonic velocity estimates of wood properties in discs of radiata pineEuan G. Mason0Michael Hayes1Nigel Pink2School of Forestry, University of CanterburyDepartment of Electrical and Computer Engineering, University of CanterburySchool of Forestry, University of CanterburyAbstract 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.http://link.springer.com/article/10.1186/s40490-017-0098-yWood qualityMicrofibril angleWood densityModulus of elasticity |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Euan G. Mason Michael Hayes Nigel Pink |
spellingShingle |
Euan G. Mason Michael Hayes Nigel Pink Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine New Zealand Journal of Forestry Science Wood quality Microfibril angle Wood density Modulus of elasticity |
author_facet |
Euan G. Mason Michael Hayes Nigel Pink |
author_sort |
Euan G. Mason |
title |
Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine |
title_short |
Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine |
title_full |
Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine |
title_fullStr |
Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine |
title_full_unstemmed |
Validation of ultrasonic velocity estimates of wood properties in discs of radiata pine |
title_sort |
validation of ultrasonic velocity estimates of wood properties in discs of radiata pine |
publisher |
Scion |
series |
New Zealand Journal of Forestry Science |
issn |
1179-5395 |
publishDate |
2017-08-01 |
description |
Abstract 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. |
topic |
Wood quality Microfibril angle Wood density Modulus of elasticity |
url |
http://link.springer.com/article/10.1186/s40490-017-0098-y |
work_keys_str_mv |
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