Hyperspectral Imaging Surface Analysis for Dried and Thermally Modified Wood: An Exploratory Study

Table 3

Band assignment for the average spectrum of naturally seasoned and kiln-dried wood.

Peak no. in Figure 7	Wavelength (nm)	Bond vibrations:
1	1452	Linked to O-H 2nd overtone (CH2-OH) from primary alcohols
2	1695–1725	Related to C-H 2nd overtone of symmetric stretching in aliphatic hydrocarbons and overlaps with C-H methyl in aromatics that may be phenols or lignin at 1744 nm
3	1928	Related to O-H stretching and HOH deformation combination from water molecule
4	2148	Related to first overtone of C-H stretching in aromatics (indicated by black and red arrow in Figure 6(b))
5	2280	Related to C-H stretching and CH2 deformations in the polysaccharides that end by signal from C-H, C-C
6	2347	Related to C-O-C stretching combinations in hydrocarbons, cellulose, and aromatics
7	2475	Related to C-H in methyl groups and C-C stretching combinations in hydrocarbons, aromatics, and cellulose