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Moisture content and strain relation in wood by Bragg grating sensor and unilateral NMR

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Abstract

The paper describes a low-invasive experimental apparatus designed for the accurate determination of mechanical deformation and moisture content (MC) relationship on macroscopic wood samples. The device is particularly indicated for monitoring wooden handwork whose mechanical deformation is especially critical in relation to its role such as, for example, works of art or architectural works. The MC of wood is measured with a portable single-sided NMR probe and mechanical deformation by a fiber Bragg grating optical sensor. The data obtained are of high accuracy, despite the dimensions of the sample. The methodology provides an effective tool for investigating the dynamic relation between environmental relative humidity, MC, and shrinking–swelling of wood. Adsorption results collected for longitudinal deformation in silver fir (Abies alba Mill.) are presented to show the sensitivity of the optical sensor. Interesting findings include the detection of two different mechanisms of elongation and the time evolution of water mobility versus hydration and strain.

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Acknowledgments

We thank Paola Fantazzini who supplied us with UPEN algorithm to get inverse Laplace transform of relaxation data. Thanks are due to Sergio Ciuchi for suggestions regarding Eq. 5. All of us are indebted to Bruker BioSpin S.r.L., Milan, Italy, for the assistance and updating of the NMR sensor.

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Authors and Affiliations

  1. Dipartimento di Fisica, Università “La Sapienza”, P.le Aldo Moro 2, 00185, Rome, Italy

    Luca Senni & Francesco De Luca

  2. ENEA CR Frascati, Via Enrico Fermi 45, 00044, Frascati, RM, Italy

    Michele Caponero

  3. Dipartimento di Fisica, Università di L’Aquila, V. Vetoio 10, 67010, Coppito, L’Aquila, Italy

    Cinzia Casieri

  4. Dipartimento ICMMPM, Università “La Sapienza”, Via Eudossiana 18, 00184, Rome, Italy

    Ferdinando Felli

  5. Centro SOFT-INFM-CNR, Università “La Sapienza”, P.le Aldo Moro 2, 00185, Rome, Italy

    Cinzia Casieri & Francesco De Luca

Authors
  1. Luca Senni
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  2. Michele Caponero
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  3. Cinzia Casieri
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  4. Ferdinando Felli
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  5. Francesco De Luca
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Correspondence to Francesco De Luca.

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Senni, L., Caponero, M., Casieri, C. et al. Moisture content and strain relation in wood by Bragg grating sensor and unilateral NMR. Wood Sci Technol 44, 165–175 (2010). https://doi.org/10.1007/s00226-009-0268-z

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  • DOI: https://doi.org/10.1007/s00226-009-0268-z

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