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

机译:木材在宽含水量范围内的介电常数测量

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摘要

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.
机译:木材结构的介电常数测量对于确保其物理性能在可接受范围内非常重要。例如,介电常数对水分含量的依赖可用于评估木材的物理状况。介电常数也是使用探地雷达(GPR)无损技术进行木材诊断所需的关键参数。过去已经使用了基于微波测量这些电磁特性的不同方法,但是仍然需要在很宽的水分含量范围内进行测量,尤其是在GPR频率(1-2 GHz)中。这项工作提出了在1.26 GHz的弱摄动方法下,在宽范围的水分含量(高达120%)中测量云杉,松木和山毛榉木材样品的相对介电常数的方法。观察到水分含量,密度和纤维方向的影响。影响介电常数的主要参数是木材中的水量。

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  • 来源
    《Wood Science and Technology》 |2017年第6期|1421-1431|共11页
  • 作者单位

    Univ Bordeaux, CNRS, UMR 5218, IMS,Bordeaux INP, 351 Cours Liberat, F-33405 Bordeaux, France|Univ Bordeaux, GCE Dept, Lab I2M, 351 Cours Liberat, F-33405 Talence, France;

    Univ Bordeaux, CNRS, UMR 5218, IMS,Bordeaux INP, 351 Cours Liberat, F-33405 Bordeaux, France;

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