Comparison of Methods for Estimating Mechanical Properties of Wood by NIR Spectroscopy

Table 6

Summary of modulus of elasticity (MOE) calibrations based on radial and transverse face NIR spectra obtained using three different methods (Foss Direct, Foss Probe, and ASD Probe) for collecting spectral data. 334 samples were used to develop the calibrations.

Property/method	Number of factors	R^2	SEC	SECV	RPDc
Foss Direct
MOE (MPa)—radial face	8	0.78	1154	1215	2.1
MOE (MPa)—transverse face	6	0.81	1095	1124	2.2
Foss Probe
MOE (MPa)—radial face	7	0.55	1668	1727	1.4
MOE (MPa)—transverse face	10	0.71	1342	1431	1.7
ASD Probe
MOE (MPa)—radial face	9	0.73	1308	1413	1.8
MOE (MPa)—transverse face	6	0.75	1252	1303	1.7