2024-03-28T08:23:21Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:02002211
2023-01-16T05:17:30Z
643:666:667
Measuring the tensile strain of wood by visible and near-infrared spatially resolved spectroscopy
Ma, Te
Inagaki, Tetsuya
Yoshida, Masato
Ichino, Mayumi
Tsuchikawa, Satoru
open access
This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s10570-021-04239-1
Tensile strain of wood
Non-destructive evaluation
Spatially resolved spectroscopy
Visible and short-wave light scattering
Multivariate analysis
Strain measurement is critical for wood quality evaluation. Using conventional strain gauges constantly is high cost, also challenging to measure precious wood materials due to the use of strong adhesive. This study demonstrates the correlation between the light scattering degrees inside the wood during tension testing and their macroscopic strain values. A multifiber-based visible-near-infrared (Vis–NIR) spatially resolved spectroscopy (SRS) system was designed to rapidly and conveniently acquire such light scattering changes. For the preliminary experiment, samples with different thicknesses, from 2 to 5 mm, were measured to evaluate the influence of sample thickness. The differences in Vis–NIR SRS spectral data diminished with an increase in sample thickness, suggesting that the SRS method can successfully measure the wood samples' whole strain (i.e., surface and inside). Then, for the primary experiment, 18 wood samples were each prepared with approximately the same sample thickness of 2 mm and 5 mm to construct strain calibration models, respectively. The prediction accuracy of the 2-mm samples was characterized by a determination coefficient (R^2) of 0.81 with a root mean squared error (RMSE) of 343.54 με for leave-one-out cross-validation; for test validation, the validation accuracy was characterized by an R^2 of 0.76 and an RMSE of 395.35 με. For the validation accuracy of the 5-mm samples, R2val was 0.69 with 440.78 με RMSEval. Overall, the presented calibration results of the SRS approach were confirmed to be superior to the standard diffuse reflectance spectroscopy.
Springer
2022-11-01
2021-11
eng
journal article
AM
http://hdl.handle.net/2237/0002002211
https://nagoya.repo.nii.ac.jp/records/2002211
https://doi.org/10.1007/s10570-021-04239-1
0969-0239
Cellulose
28
17
10787
10801
https://nagoya.repo.nii.ac.jp/record/2002211/files/Wood tension_SRS_20210921.pdf
application/pdf
2.5 MB
2022-11-01