用近红外光谱和图像分析研究了木材干燥过程中的流体力学行为

IF 2.2 3区 农林科学 Q2 FORESTRY Holzforschung Pub Date : 2023-06-30 DOI:10.1515/hf-2023-0030
Evelize Aparecida Amaral, Lívia Freire Baliza, Luana Maria dos Santos, André Tetsuo Shashiki, P. F. Trugilho, P. R. Hein
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引用次数: 0

摘要

摘要木材的物理性能是评定材料质量的重要参数。然而,由于它是一种不均匀的材料,样品中的水分含量和木材收缩可能会有所不同。因此,目的是使用近红外光谱和图像分析来监测木材在干燥过程中的流体力学行为。在木板的径向表面上标记等距点,并在干燥过程中在每个标记处记录近红外光谱。在每个干燥步骤中进行光谱采集后,获得图像,并参考标记来监测干燥过程中的收缩。通过近红外光谱估算的水分含量(MC)与参考值具有很强的相关性(R2cv=0.92,RMSEcv=9.82 %). 根据这些估计,可以生成图形图像,以可视化和量化木材干燥过程中MC和收缩的空间变化。在干燥的初始阶段,材料的末端相对于样品的中心显示出高湿度。然而,MC损失为11 % 与内部相比,木板端部的收缩率更大,而外部区域的收缩率是内部的3倍。与图像分析相关的近红外技术的使用可以成为估计木材水分含量和收缩的一种很有前途的工具。
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Hydromechanical behavior of wood during drying studied by NIR spectroscopy and image analysis
Abstract The physical properties of wood are important parameters to qualify the material. However, as it is a heterogeneous material, moisture content and wood contractions may vary within the sample. Thus, the objective was to monitor the hydromechanical behavior of wood during drying using near infrared (NIR) spectroscopy and image analysis. Equidistant points were marked on the radial surface of a wooden board and NIR spectra were recorded at each marking during drying of the piece. After spectral acquisition in each drying step, images were obtained and the markings were referenced to monitor contractions during drying. Moisture content (MC) estimates via NIR spectra showed strong correlation with reference values (R2cv = 0.92, RMSEcv = 9.82 %). From the estimates it was possible to generate graphic images to visualize and quantify the spatial variation of MC and shrinkage during wood drying. In the initial stages of drying, the ends of the material showed high moisture in relation to the center of the sample. However, MC loss was 11 % greater at the ends of the wood board when compared to its interior while the shrinkage in external zones was 3 times greater than the internal part. The use of NIR technique associated with image analysis can be a promising tool for estimating moisture contents and contractions in wood.
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来源期刊
Holzforschung
Holzforschung 工程技术-材料科学:纸与木材
CiteScore
4.60
自引率
4.20%
发文量
83
审稿时长
3.3 months
期刊介绍: Holzforschung is an international scholarly journal that publishes cutting-edge research on the biology, chemistry, physics and technology of wood and wood components. High quality papers about biotechnology and tree genetics are also welcome. Rated year after year as one of the top scientific journals in the category of Pulp and Paper (ISI Journal Citation Index), Holzforschung represents innovative, high quality basic and applied research. The German title reflects the journal''s origins in a long scientific tradition, but all articles are published in English to stimulate and promote cooperation between experts all over the world. Ahead-of-print publishing ensures fastest possible knowledge transfer.
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