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Descripción
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| The mechanical properties of timber can be estimated from wave propagation velocity by measuring wave time-of-flight (ToF). However, a time-lag complicates the measurements, which produces an apparent velocity dependency on length and this species and instrument dependent property is also influenced by knottiness. This research is dealing with time-lag determination by different sensor positioning in situ ToF measurements. ToF longitudinal measurements were conducted on 120 90 mm × 140 mm specimens of the coniferous species radiata pine, Scots pine, laricio pine and maritime pine. The following commercially available acoustic devices were used: Sylvatest Duo, USLab, and Microsecond Timer. The sensors were arranged for the measurement types ?end-to-end?, ?on the same surface? and ?on opposite surfaces?. ToF data were obtained from the full-length (4 m) specimens and then from the same specimens shortened to 3 m, 2 m and 1 m in length. The in situ procedures of ToF are applicable for a reliable length determination independently from the time-lag (tL) and velocity. The differences observed by end-to-end measurements, with respect to velocity, are below 4.4%. A velocity correction factor can be deduced for each instrument, which is independent of species. | |
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Internacional
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JCR del ISI
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Si |
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Título de la revista
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Holzforschung |
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ISSN
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0018-3830 |
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Factor de impacto JCR
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1,868 |
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Información de impacto
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Volumen
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71 |
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DOI
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10.1515/hf-2016-0214 |
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Número de revista
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9 |
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Desde la página
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713 |
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Hasta la página
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723 |
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Mes
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SEPTIEMBRE |
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Ranking
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