Abstract
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 (R2) 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 R2 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.
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The authors are grateful for the financial support provided by JSPS (KAKENHI, no.19K15886)
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This study is supportted by JSPS (KAKENHI, No.19K15886).
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TM: methodology, data collection and analysis, writing-original draft preparation. TI: methodology, data validation, and writing- reviewing. MY: contributed to capture the submicroscopic changes during tension testing, writing- reviewing. MI: data collection and analysis. ST: supervision, conceptualization, writing- reviewing and editing.
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Ma, T., Inagaki, T., Yoshida, M. et al. Measuring the tensile strain of wood by visible and near-infrared spatially resolved spectroscopy. Cellulose 28, 10787–10801 (2021). https://doi.org/10.1007/s10570-021-04239-1
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DOI: https://doi.org/10.1007/s10570-021-04239-1