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.
References
Boden, S., Schinker, M.G., Duncker, P., and Spiecker, H. (2012). Resolution abilities and measuring depth of high-frequency densitometry on wood samples. Measurement 45: 1913–1921, https://doi.org/10.1016/j.measurement.2012.03.013.Suche in Google Scholar
Bossou, O.V., Mosig, J.R., and Zurcher, J.F. (2010). Dielectric measurements of tropical wood. Measurement 43: 400–405, https://doi.org/10.1016/j.measurement.2009.12.008.Suche in Google Scholar
Burke, E.J., Harlow, R.C., and Ferré, T.P.A. (2005). Measuring the dielectric permittivity of a plant canopy and its response to changes in plant water status: an application of impulse time domain transmission. Plant Soil 268: 123–133, https://doi.org/10.1007/s11104-004-0303-7.Suche in Google Scholar
Dahlen, J., Antony, F., Li, A., Love-Myers, K., Schimleck, L., and Schilling, E.B. (2015). Time-domain reflectometry for the prediction of loblolly pine and sweetgum moisture content. Bioresources 10: 4947–4960, https://doi.org/10.15376/biores.10.3.4947-4960.Suche in Google Scholar
Damez, R., Artillan, P., Hellouin de Menibus, A., Bermond and, C., and Xavier, P. (2020). Effect of water content on microwave dielectric properties of building materials. Construct. Build. Mater. 263: 120107, https://doi.org/10.1016/j.conbuildmat.2020.120107.Suche in Google Scholar
Deng, Z., Guan, H., Hutson, J., Forster, M.A., Wang, Y., and Simmons, C.T. (2017). A vegetation-focused soil-plant-atmospheric continuum model to study hydrodynamic soil-plant water relations. Water Resour. Res. 53: 4965–4983, https://doi.org/10.1002/2017wr020467.Suche in Google Scholar
Gray, A.N. and Spies, T.A. (1995). Water content measurement in forest soils and decayed wood using time domain reflectometry. Can. J. For. Res. 25: 376–385, https://doi.org/10.1139/x95-042.Suche in Google Scholar
Hao, G.Y., Wheeler, J.K., Holbrook, N.M., and Goldstein, G. (2013). Investigating xylem embolism formation, refilling and water storage in tree trunks using frequency domain reflectometry. J. Exp. Bot. 64: 2321–2332, https://doi.org/10.1093/jxb/ert090.Suche in Google Scholar PubMed PubMed Central
He, H., Turner, N.C., Aogu, K., Dyck, M., Feng, H., Si, B., Wang, J., and Lv, J. (2021). Time and frequency domain reflectometry for the measurement of tree stem water content: a review, evaluation, and future perspectives. Agric. For. Meteorol. 306: 108442, https://doi.org/10.1016/j.agrformet.2021.108442.Suche in Google Scholar
Hu, L., Li, W.B., Ling, Z.K., and Yu, H.S. (2017). Low temperature microwave-assisted pyrolysis of wood sawdust for phenolic rich compounds: kinetics and dielectric properties analysis. Bioresour. Technol. 238: 109–115, https://doi.org/10.1016/j.biortech.2017.04.030.Suche in Google Scholar PubMed
Jafarpour, G., Dantras, E., Boudet, A., and Lacabanne, C. (2008). Molecular mobility of poplar cell wall polymers studied by dielectric techniques. J. Non-Cryst. Solids 354: 3207–3214, https://doi.org/10.1016/j.jnoncrysol.2008.01.008.Suche in Google Scholar
Luo, H., Bao, L.W., Kong, L.Z., and Sun, Y.H. (2017). Low temperature microwave-assisted pyrolysis of wood sawdust for phenolic rich compounds: kinetics and dielectric properties analysis. Bioresour. Technol. 238: 109–115, https://doi.org/10.1016/j.biortech.2017.04.030.Suche in Google Scholar PubMed
Mai, T.C., Razafindratsima, S., Sbartai, Z.M., Demontoux, F., and Bos, F. (2015). Non-destructive evaluation of moisture content of wood material at GPR frequency. Construct. Build. Mater. 77: 213–217, https://doi.org/10.1016/j.conbuildmat.2014.12.030.Suche in Google Scholar
Martin, P., Collet, R., Barthelemy, P., and Roussy, G. (1987). Evaluation of wood characteristics internal scanning of the material by microwaves. Wood Sci. Technol. 21: 361–371, https://doi.org/10.1007/bf00380203.Suche in Google Scholar
Martínez-Sala, R., Rodríguez-Abad, I., Diez Barra, R., and Capuz-Lladró, R. (2013). Assessment of the dielectric anisotropy in timber using the nondestructive GPR technique. Construct. Build. Mater. 38: 903–911, https://doi.org/10.1016/j.conbuildmat.2012.09.052.Suche in Google Scholar
Nadler, A., Raveh, E., Yermiyahu, U., and Green, S.R. (2003). Evaluation of TDR use to monitor water content in stem of lemon trees and soil and their response to water stress. Soil Sci. Soc. Am. J. 67: 437–448, https://doi.org/10.2136/sssaj2003.4370.Suche in Google Scholar
Norimoto, M. and Yamada, T. (1971). The dielectric properties of wood V on the dielectric anisotropy of wood. Wood Res. 51: 12–32.Suche in Google Scholar
Ramasamy, S. and Moghtaderi, B. (2010). Dielectric properties of typical Australian wood-based biomass materials at microwave frequency. Energy Fuel. 24: 4534–4548, https://doi.org/10.1021/ef100623e.Suche in Google Scholar
Rice, R.W., Steele, P.H., and Kumar, L. (1992). Detecting knots and voids in lumber with dielectric sensors. Ind. Metrol. 2: 309–315, https://doi.org/10.1016/0921-5956(92)80010-q.Suche in Google Scholar
Sahin, H. and Ay, N. (2004). Dielectric properties of hardwood species at microwave frequencies. J. Wood Sci. 50: 375–380, https://doi.org/10.1007/s10086-003-0575-1.Suche in Google Scholar
Schimleck, L., Love-Myers, K., Sanders, J., Raybon, H., Daniels, R., Mahon, J., Andrews, E., and Schilling, E. (2011). Measuring the moisture content of green wood using time domain reflectometry. For. Prod. J. 61: 428–434, https://doi.org/10.13073/0015-7473-61.6.428.Suche in Google Scholar
Sparks, J.P., Campbell, G.S., and Black, A.R. (2001). Water content, hydraulic conductivity, and ice formation in winter stems of Pinus contorta: a TDR case study. Oecologia 127: 468–475, https://doi.org/10.1007/s004420000587.Suche in Google Scholar PubMed
Sugimoto, H. and Norimoto, M. (2003). Dielectric relaxation of heat-treated wood. J. Soc. Mater. Sci. 52: 362–367, https://doi.org/10.2472/jsms.52.362.Suche in Google Scholar
Sugimoto, H., Miki, T., Kanayama, K., and Norimoto, M. (2008). Dielectric relaxation of water adsorbed on cellulose. J. Non-Cryst. Solids 354: 3220–3224, https://doi.org/10.1016/j.jnoncrysol.2008.01.003.Suche in Google Scholar
Tiitta, M. and Olkkonen, H. (2002). Electrical impedance spectroscopy device for measurement of moisture gradients in wood. Rev. Sci. Instrum. 73: 3093, https://doi.org/10.1063/1.1485783.Suche in Google Scholar
Torgovnikov, G.I. (Ed.) (1993). Dielectric properties of wood-based materials. Springer, Berlin Heidelberg.10.1007/978-3-642-77453-9_8Suche in Google Scholar
Xu, H.D. and Wang, L.H. (2014). Analysis of cold temperature effect on stress wave velocity in green wood. Holzforschung 68: 693–698, https://doi.org/10.1515/hf-2013-0151.Suche in Google Scholar
Yu, H.Z., Liu, H., Zhang, Y.L., Ning, J.B., G, Y., Hu, T.X., and Yang, G. (2022). Design and experiment of monitoring system for surface fine fuel moisture. For. Eng. 38: 38–47.Suche in Google Scholar
© 2022 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- 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
Artikel in diesem Heft
- 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
