A Qualitative and Quantitative NIRs Study on Larch Wood Surface Color Change by UV Light Irradiation

Rui-yun FU; Xiao-hui FU; Wen-bo ZHANG; Dong-qing LI; Cheng GUAN; Hou-jiang ZHANG

doi:10.3964/j.issn.1000-0593(2022)01-0056-06

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 1 >Page 56 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 1, 56 (2022)

A Qualitative and Quantitative NIRs Study on Larch Wood Surface Color Change by UV Light Irradiation

Rui-yun FU^1、*, Xiao-hui FU^1、1;, Wen-bo ZHANG^{1、1; 4; *;}, Dong-qing LI^2、2;, Cheng GUAN^{3、3; 4;}, and Hou-jiang ZHANG^{3、3; 4;}

Author Affiliations

¹1. College of Material Science and Technology, Beijing Forestry University, Beijing 100083, China

²2. Beijing Research Institute of Historic Architecture Conservation & Design, Beijing 100050, China

³3. College of Technology, Beijing Forestry University, Beijing 100083, China

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DOI: 10.3964/j.issn.1000-0593(2022)01-0056-06 Cite this Article

Rui-yun FU, Xiao-hui FU, Wen-bo ZHANG, Dong-qing LI, Cheng GUAN, Hou-jiang ZHANG. A Qualitative and Quantitative NIRs Study on Larch Wood Surface Color Change by UV Light Irradiation[J]. Spectroscopy and Spectral Analysis, 2022, 42(1): 56 Copy Citation Text

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Fig. 1. The NIRs second derivative spectra of larch wood with and without ultraviolet light irradiation
(a): 7 100~5 450 cm^-1; (b): 5 000~4 000 cm^-1

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The NIRs difference spectrum (dotted line) and Second-derivative spectra (solid lines) of without and with ultraviolet light irradiation of 1 080 h(a): 7 100~5 450 cm-1; (b): 5 000~4 000 cm-1

Fig. 2. The NIRs difference spectrum (dotted line) and Second-derivative spectra (solid lines) of without and with ultraviolet light irradiation of 1 080 h
(a): 7 100~5 450 cm^-1; (b): 5 000~4 000 cm^-1

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Fig. 3. Correlation between colorimetric parameters values a^*, b^*, L^*(a, b, c) measured value and predicted value

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紫外老化时间	L^*	a^*	b^*	ΔE^*
未处理	72.01	11.29	23.74	-
180 h	53.61	19.57	33.96	22.62
540 h	49.04	21.07	33.97	26.98
900 h	42.78	20.88	27.73	31.02
1 080 h	39.19	19.66	23.00	33.88

Table 1. Chromaticity parameters of larch wood with and without ultraviolet light irradiation

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No.	波数/cm^-1	吸收带归属	文献
a	6 996	1^st OT. O—H str./纤维素非结晶区	[8]
b	6 773	1^st OT. O—H str./纤维素半结晶区	[9]
c	6 287	1^st OT. O—H str./纤维素结晶区	[8]
d	5 986	1^st OT. C—H str.木质素芳香环骨架	[9]
e	5 800	1^st OT. C—H str./半纤维素的呋喃和吡喃	[8]
f	4 852~4667	O—H str.+C—H def./纤维素结晶区或半结晶区	[9]
g	4 404	O—H str.+C—H₂ def./纤维素和半纤维素	[8]
h	4 281	C—H str.+C—H def.纤维素和半纤维素、木聚糖	[8]
i	4019	C—H str.+C-C str./纤维素	[8]

Table 2. Assignment of representative absorption bands in Larch wood

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参数	预处理方法	光谱范围/cm^-1	维数	$R_{C}^{2}$	$R_{V}^{2}$	RMSEC	RMSECV	RPD_C	RPD_V
L^*	矢量归一+ 一阶导数+ 多元散射校正	6 102~4 598 5 450~4 598 4 602~4 247	10	0.970 8	0.948 8	2.14	2.68	5.85	4.42
a^*	一阶导数	5 450~4 598 6 102~5 446	9	0.954 2	0.928 0	0.878	1.04	4.67	3.73
b^*	一阶导数	5 450~4 247 6 102~5 446	9	0.9448	0.831 0	1.31	2.18	4.26	2.43

Table 3. Detailed parameters of color prediction models of larch wood

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