Determination of moisture fraction in wood by mobile NMR device

Casieri, C.; Senni, Luca; Romagnoli, Manuela; Santamaria, Ulderico; Luca, Francesco De

doi:10.1016/j.jmr.2004.09.014

Cited by 76 publications

(50 citation statements)

References 14 publications

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“…As a matter of fact, as has been just mentioned, the unilateral device is characterized by a natural spatial selectivity of the sensitive volume of the probe that allows one to measure the NMR parameters in a precise and fixed volume of the sample. That makes it possible, by utilizing proper calibration procedures [14], to relate the NMR magnetization to the water content of this volume.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, the possibility of using relaxation data as a non-destructive and non-invasive tool for in situ analysis of objects and materials of interest for the Cultural Heritage has become available, thanks to the development of portable surface probes [10,11], which can be applied to art objects of any dimensions, even if unmovable, simply by placing them on the selected surface of the sample to be analyzed [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Water absorption kinetics in different wettability conditions studied at pore and sample scales in porous media by NMR with portable single-sided and laboratory imaging devices

Bortolotti

Camaiti²,

Casieri

et al. 2006

Journal of Magnetic Resonance

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water absorption kinetics in different wettability conditions studied at pore and sample scales in porous media by NMR with portable single-sided and laboratory imaging devices

Bortolotti

Camaiti²,

Casieri

et al. 2006

Journal of Magnetic Resonance

Self Cite

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“…NMR Imaging has been proven to be an excellent tool to determine the distribution and the concentration of water in wood during drying (Quick et al 2007;Stenström et al 2014;Dvinskikh et al 2011a, b), and during uptake (Robertson and Packer 1999;Van Meel et al 2011;Donkers et al 2013). In situ determination of local moisture content has been achieved by portable NMR devices (Casieri et al 2004;Dvinskikh et al 2011b). Another important advantage of NMR over other methods is its ability to distinguish between bound and free water by relaxation analysis (T 2 ), i.e.…”

Section: Introductionmentioning

confidence: 99%

Bound and free water distribution in wood during water uptake and drying as measured by 1D magnetic resonance imaging

et al. 2016

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Knowledge on moisture transport in wood is important for understanding its utilization, durability and product quality. Moisture transport processes in wood can be studied by Nuclear Magnetic Resonance (NMR) imaging. By combining NMR imaging with relaxometry, the state of water within wood can be identified, i.e. water bound to the cell wall, and free water in the cell lumen/vessel. This paper presents how the transport of water can be monitored and quantified in terms of bound and free water during water uptake and drying. Three types of wood from softwood to hardwood were selected covering a range of low to high density wood; pine sapwood and oak and teak. A calibration is performed to determine the different water states in each different wood type and to convert the NMR signal into moisture content. For all wood types, water transport appeared to be internally limited during both uptake and drying. In case of water uptake, free water was observed only after the cell walls were saturated with bound water. In case of drying, the loss of bound water starts only after vanishing of free water, irrespective of the position. Obviously, there is always a local thermodynamic equilibrium of bound and free water for both uptake and drying. Finally, we determined the effective diffusion coefficient (D eff ). Experimentally determined diffusion constants were compared with those derived by the diffusion models for conceptual understanding of transport mechanism. We found that diffusion in the cell wall fibers plays a critical role in the transport process.

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“…A newly developed digital X-ray microscope used to measure WMC was presented by Watanabe et al (2008). Nuclear magnetic resonance (NMR) enables instantaneous determination of the proton density in liquids and is thus convenient for determining MC of measured objects (Barale et al, 2002;Casieri et al, 2004;Merela et al, 2009;Senni et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Nondestructive testing method of wood moisture content based on a planar capacitance sensor model

2010

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For our research, a new hybrid experimental-computational method is presented. We applied a least squares fitting method (LSFM) to reconstruct the wood moisture content (WMC) from the data measured with a planar capacitance sensor. A boundary element method (BEM) was used to compute the relationship between capacitance and the dielectric constant. A functional relationship between MC and the dielectric constant was identified by LSFM. The agreement of this final computation result with the experimental data indicates that this method can be used to estimate the WMC quickly and effectively with engineering analysis. Compared with popular statistical methods, a large number of experiments are avoided, some costs of testing are reduced and the efficiency of testing is enhanced.

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Determination of moisture fraction in wood by mobile NMR device

Cited by 76 publications

References 14 publications

Water absorption kinetics in different wettability conditions studied at pore and sample scales in porous media by NMR with portable single-sided and laboratory imaging devices

Water absorption kinetics in different wettability conditions studied at pore and sample scales in porous media by NMR with portable single-sided and laboratory imaging devices

Bound and free water distribution in wood during water uptake and drying as measured by 1D magnetic resonance imaging

Nondestructive testing method of wood moisture content based on a planar capacitance sensor model

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