Dielectric behaviour of Aleppo Pine, Holm Oak and Thuja Burl woods in microwaves range  (0.13 to 20 GHz)

 

S. El Alami1,2*, A. Hakam1,3, M. Ziani4, N. Alami Chantoufi1,3,

Z. Hamoutahra1, A. Famiri5, B. Kabouchi1,2

1 UFR Sciences du Bois, Faculté des Sciences, Université Mohammed V- Agdal, B.P 1014, Rabat, Morocco

2 Equipe de Spectronomie Moléculaire, Optique et Instrumentation Laser, Faculté des Sciences,

Université Mohammed V-Agdal, Rabat, Morocco

3Equipe des Sciences et Technologies du Bois, Faculté des Sciences,

Université Mohammed V-Agdal, Rabat, Morocco

4 Institut National des Sciences de l’Archéologie et du Patrimoine, Rabat, Morocco

5 Centre de la Recherche Forestière, Charia Omar Ibn Al khattab, B.P 763, Rabat, Morocco

* Corresponding author. E-mail: sal_alami@yahoo.fr

Received: 17 February 2012; revised version accepted: 28 March 2012

 

Abstract

     The dielectric properties of three Moroccan woods (Aleppo pine, Holm oak and Thuja burl) having moisture content 12%, are measured by the microwaves reflection method, in the frequency range: 0.13 - 20GHz, at a temperature 22°C. The obtained results concerning the dielectric constant (e) and the dielectric loss factor (e’’) for the studied woods are different and depend as well on the frequencies zone and the anisotropy directions. Two principal critical frequencies values (1.14 GHz and 7.49 GHz) are shown respectively for the dielectric constant and dielectric loss factor measurements. The dielectric properties are greater in the longitudinal direction than in radial and tangential directions for all samples.

 

Keywords: Wood; Aleppo pine; Holm oak;  Thuja burl; Dielectric constant; Dielectric loss factor; Microwaves reflection.

 


 

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