Skip to main content
Erschienen in: Wood Science and Technology 6/2017

21.06.2017 | Original

Permittivity measurement of wood material over a wide range of moisture content

verfasst von: Stephen Razafindratsima, Zoubir Mehdi Sbartaï, François Demontoux

Erschienen in: Wood Science and Technology | Ausgabe 6/2017

Einloggen

Aktivieren Sie unsere intelligente Suche um passende Fachinhalte oder Patente zu finden.

search-config
loading …

Abstract

Permittivity measurement of timber structures is important to ensure that its physical property lies within acceptable ranges. For example, permittivity dependence on moisture content can be useful to assess physical condition of wood. Permittivity is also a critical parameter that is needed for timber diagnosis using ground-penetrating radar (GPR) nondestructive technique. Different methods based on microwave measurements of these electromagnetic properties have been used in the past, but measurements over a wide range of moisture content are still needed, especially in the GPR frequency (1–2 GHz). This work presents measurements of relative permittivity values of spruce, pine and beech wood samples over a wide range of moisture content (up to 120%) using weak perturbation method at 1.26 GHz. Effects of moisture content, density and direction of fibers are observed. The main parameter influencing permittivity value is the quantity of water in wood material.

Sie haben noch keine Lizenz? Dann Informieren Sie sich jetzt über unsere Produkte:

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

  • über 67.000 Bücher
  • über 390 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Nachhaltigkeit
  • Maschinenbau + Werkstoffe




 

Jetzt Wissensvorsprung sichern!

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

  • über 102.000 Bücher
  • über 537 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Nachhaltigkeit
  • Finance + Banking
  • Management + Führung
  • Marketing + Vertrieb
  • Maschinenbau + Werkstoffe
  • Versicherung + Risiko

Jetzt Wissensvorsprung sichern!

Literatur
Zurück zum Zitat Boudouris G (1964) Validité de la méthode de perturbation appliquée aux cavités résonnantes pour la mesure de la perméabilité et de la permittivité des petits échantillons (Weak perturbation method validity applied to resonant cavity: measurement of permeability and permittivity of small samples). Ann Telecommun 19:63–80 (in French) Boudouris G (1964) Validité de la méthode de perturbation appliquée aux cavités résonnantes pour la mesure de la perméabilité et de la permittivité des petits échantillons (Weak perturbation method validity applied to resonant cavity: measurement of permeability and permittivity of small samples). Ann Telecommun 19:63–80 (in French)
Zurück zum Zitat Daian G, Taube A, Birnboim A, Shramkov Y, Daian M (2005) Measuring the dielectric properties of wood at microwave frequencies. Wood Sci Technol 39:215–223CrossRef Daian G, Taube A, Birnboim A, Shramkov Y, Daian M (2005) Measuring the dielectric properties of wood at microwave frequencies. Wood Sci Technol 39:215–223CrossRef
Zurück zum Zitat Demontoux F (1999) Contribution à l’amélioration des mesures de permittivité à 2450 MHz et au développement d’un applicateur micro ondes dédié à la flash pasteurisation à l’aide de modélisations électromagnétique et thermique (Contribution to increase the accuracy of the permittivity measurement at 2450 MHz and to develop a microwave applicator for flash pasteurisation thanks to electromagnetic and thermal modelling). PhD. thesis, Bordeaux 1 (in French) Demontoux F (1999) Contribution à l’amélioration des mesures de permittivité à 2450 MHz et au développement d’un applicateur micro ondes dédié à la flash pasteurisation à l’aide de modélisations électromagnétique et thermique (Contribution to increase the accuracy of the permittivity measurement at 2450 MHz and to develop a microwave applicator for flash pasteurisation thanks to electromagnetic and thermal modelling). PhD. thesis, Bordeaux 1 (in French)
Zurück zum Zitat Hanhijärvi A (2000) Advances in the knowledge of the influence of moisture changes on the long-term mechanical performance of timber structures. Mater Struct 33:43–49CrossRef Hanhijärvi A (2000) Advances in the knowledge of the influence of moisture changes on the long-term mechanical performance of timber structures. Mater Struct 33:43–49CrossRef
Zurück zum Zitat Hans G, Redman D, Leblon B, Nader J, La Rocque A (2015) Determination of log moisture content using early-time ground penetrating radar signal. Wood Mater Sci Eng 10:112–129CrossRef Hans G, Redman D, Leblon B, Nader J, La Rocque A (2015) Determination of log moisture content using early-time ground penetrating radar signal. Wood Mater Sci Eng 10:112–129CrossRef
Zurück zum Zitat Hansson L, Lundgren N, Antti A, Hagman O (2005) Microwave penetration in wood using imaging sensor. Measurement 38:15–20CrossRef Hansson L, Lundgren N, Antti A, Hagman O (2005) Microwave penetration in wood using imaging sensor. Measurement 38:15–20CrossRef
Zurück zum Zitat James W, Hamill D (1965) Dielectric properties of Douglas-fir measured at microwave frequencies. Forest Prod J 15:51–56 James W, Hamill D (1965) Dielectric properties of Douglas-fir measured at microwave frequencies. Forest Prod J 15:51–56
Zurück zum Zitat Johansson J, Hagman O, Fjellner BA (2003) Predicting moisture content and density distribution of scots pine by microwave scanning of sawn timber. J Wood Sci 49:312–316CrossRef Johansson J, Hagman O, Fjellner BA (2003) Predicting moisture content and density distribution of scots pine by microwave scanning of sawn timber. J Wood Sci 49:312–316CrossRef
Zurück zum Zitat Kollman FFP, Côté WA (1968) Principles of wood science and technology: solid wood. Allen & Unwin, Crows NestCrossRef Kollman FFP, Côté WA (1968) Principles of wood science and technology: solid wood. Allen & Unwin, Crows NestCrossRef
Zurück zum Zitat Maï T, Sbartaï Z, Bos F, Razandratsima S, Demontoux F (2014) Non destructive evaluation of timber structures using GPR technique. In: 2014 15th international conference on ground penetrating radar (GPR). IEEE, pp 218–222 Maï T, Sbartaï Z, Bos F, Razandratsima S, Demontoux F (2014) Non destructive evaluation of timber structures using GPR technique. In: 2014 15th international conference on ground penetrating radar (GPR). IEEE, pp 218–222
Zurück zum Zitat Maï TC, Razandratsima S, Sbartaï ZM, Demontoux F, Bos F (2015) Non-destructive evaluation of moisture content of wood material at GPR frequency. Constr Build Mater 77:213–217CrossRef Maï TC, Razandratsima S, Sbartaï ZM, Demontoux F, Bos F (2015) Non-destructive evaluation of moisture content of wood material at GPR frequency. Constr Build Mater 77:213–217CrossRef
Zurück zum Zitat Martínez-Sala R, Rodríguez-Abad I, Barra RD, Capuz-Lladró R (2013) Assessment of the dielectric anisotropy in timber using the nondestructive GPR technique. Constr Build Mater 38:903–911CrossRef Martínez-Sala R, Rodríguez-Abad I, Barra RD, Capuz-Lladró R (2013) Assessment of the dielectric anisotropy in timber using the nondestructive GPR technique. Constr Build Mater 38:903–911CrossRef
Zurück zum Zitat Milota MR (1994) Specific gravity as a predictor of species correction factors for a capacitance-type moisture meter. Forest Prod J 44:63 Milota MR (1994) Specific gravity as a predictor of species correction factors for a capacitance-type moisture meter. Forest Prod J 44:63
Zurück zum Zitat Peyskens E, De Pourcq M, Stevens M, Schalck J (1984) Dielectric properties of softwood species at microwave frequencies. Wood Sci Technol 18:267–280CrossRef Peyskens E, De Pourcq M, Stevens M, Schalck J (1984) Dielectric properties of softwood species at microwave frequencies. Wood Sci Technol 18:267–280CrossRef
Zurück zum Zitat Reci H, Sbartaï ZM, Pajewski L, Marciniak M (2016) Moisture evaluation of wood material using GPR with WARR method-cost action TU1208. In: EGU general assembly conference abstracts, vol 18, p 18414 Reci H, Sbartaï ZM, Pajewski L, Marciniak M (2016) Moisture evaluation of wood material using GPR with WARR method-cost action TU1208. In: EGU general assembly conference abstracts, vol 18, p 18414
Zurück zum Zitat Sahin H, Ay N (2004) Dielectric properties of hardwood species at microwave frequencies. J Wood Sci 50:375–380CrossRef Sahin H, Ay N (2004) Dielectric properties of hardwood species at microwave frequencies. J Wood Sci 50:375–380CrossRef
Zurück zum Zitat Schajer GS, Orhan FB (2006) Measurement of wood grain angle, moisture content and density using microwaves. Holz Roh Werkst 64:483–490CrossRef Schajer GS, Orhan FB (2006) Measurement of wood grain angle, moisture content and density using microwaves. Holz Roh Werkst 64:483–490CrossRef
Zurück zum Zitat Stamm AJ (1929) The fiber-saturation point of wood as obtained from electrical conductivity measurements. Ind Eng Chem 1:94–97 Stamm AJ (1929) The fiber-saturation point of wood as obtained from electrical conductivity measurements. Ind Eng Chem 1:94–97
Zurück zum Zitat Torgovnikov GI (1993) Dielectric properties of wood-based materials. In: Timell TE (ed) Dielectric properties of wood and wood-based materials. Springer, Berlin, pp 135–159 Torgovnikov GI (1993) Dielectric properties of wood-based materials. In: Timell TE (ed) Dielectric properties of wood and wood-based materials. Springer, Berlin, pp 135–159
Zurück zum Zitat Walker JC (2006) Primary wood processing: principles and practice. Springer, Berlin Walker JC (2006) Primary wood processing: principles and practice. Springer, Berlin
Zurück zum Zitat Wilson PJ (1999) Accuracy of a capacitance-type and three resistance-type pin meters for measuring wood moisture content. Forest Prod J 49:29 Wilson PJ (1999) Accuracy of a capacitance-type and three resistance-type pin meters for measuring wood moisture content. Forest Prod J 49:29
Metadaten
Titel
Permittivity measurement of wood material over a wide range of moisture content
verfasst von
Stephen Razafindratsima
Zoubir Mehdi Sbartaï
François Demontoux
Publikationsdatum
21.06.2017
Verlag
Springer Berlin Heidelberg
Erschienen in
Wood Science and Technology / Ausgabe 6/2017
Print ISSN: 0043-7719
Elektronische ISSN: 1432-5225
DOI
https://doi.org/10.1007/s00226-017-0935-4

Weitere Artikel der Ausgabe 6/2017

Wood Science and Technology 6/2017 Zur Ausgabe

IAWS NEWS

IAWS News