The effect of frequency and temperature on dielectric properties of wood with high moisture content
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Ruixia Qin
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Yanbo Hu
Abstract
Dielectric sensors are a popular choice for determining wood moisture content. However, the output of these devices, especially when measuring high moisture content, may be significantly affected by the moisture content itself, by sensor frequency (f) and by environmental temperature (T). This study investigated the effect mechanism of f and T on dielectric properties of wood with different moisture contents. Dielectric constant (ε) and dielectric loss factor (tan δ) for Populus nigra, Tilia tuan, Abies fabri and Fraxinus mandshurica wood samples of various moisture contents were measured from 1 to 107 Hz and from – 40 to 25 °C. The results show that wood ε increases with increasing moisture content and temperature, and decreases with increasing f. The dielectric constant depends significantly on f when T exceeds 6 °C, the rate of ε decreases with increasing f. At room temperature, tan δ of wood with moisture content >50% were not related, and peaked between 103 and 104 Hz. The change of tan δ with T is complex. The results provide a basis for in-depth research on the dielectric properties of wood with high moisture content and a theoretical basis for the measurement and calibration of the moisture content of standing trees.
Funding source: The National Key Research and Development Program of China
Award Identifier / Grant number: 2021YFD2201205
Funding source: The Fundamental Research Funds for the Central Universities
Award Identifier / Grant number: 2572022BL03
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 31870537
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: This work was financially supported by the National Key Research and Development Program of China (grant no. 2021YFD2201205), the National Natural Science Foundation of China (31870537), and the Fundamental Research Funds for the Central Universities (2572022BL03).
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Conflict of interest statement: The authors declare that they have no conflicts of interest regarding this article.
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Articles in the same Issue
- Frontmatter
- Original Articles
- Accelerated weathering performance of plantation-grown juvenile poplar and Chinese fir woods
- The effect of frequency and temperature on dielectric properties of wood with high moisture content
- Evaluation of the spatial variation in moisture content inside wood pieces during drying by NIR spectroscopy
- Effects of boron compounds impregnation on the physical and vibro-mechanical properties of spruce (Picea sp.)
- Assembly of electric double-layer capacitors with hardwood kraft lignin-based electrodes and separator together with ionic liquid electrolyte
Articles in the same Issue
- Frontmatter
- Original Articles
- Accelerated weathering performance of plantation-grown juvenile poplar and Chinese fir woods
- The effect of frequency and temperature on dielectric properties of wood with high moisture content
- Evaluation of the spatial variation in moisture content inside wood pieces during drying by NIR spectroscopy
- Effects of boron compounds impregnation on the physical and vibro-mechanical properties of spruce (Picea sp.)
- Assembly of electric double-layer capacitors with hardwood kraft lignin-based electrodes and separator together with ionic liquid electrolyte
