Canadian Forest Service Publications
Development of a portable spectroscopic sensor to measure wood and fibre properties in standing mountain pine beetle-attacked trees and decked logs. 2006. Hsieh, E.; Uy, N.; Wallbacks, L. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, Victoria, BC. Mountain Pine Beetle Initiative Working Paper 2006-16. 33 p.
Available from: Pacific Forestry Centre
Catalog ID: 26603
A visible-near-infrared (vis-NIR) spectrometer was used to develop a unique, fast-scanning and field-portable tool to quantify parameters of relevance to mountain pine beetle infested standing lodgepole pines and decked logs. Three calibration models to simultaneously predict moisture, density, blue stain and decay were developed for three different applications; 1) to measure wood cores in the laboratory 2) to obtain field measurements on standing trees 3) to measure decked logs. All calibration models were validated and the results demonstrate that vis-NIR can be used to measure moisture, blue stain and decay with high accuracy. Density trends can also be measured using vis-NIR spectroscopy, but with less accuracy than standard laboratory methods. Of the three models, the calibration for decked logs produced the smallest errors due to the larger measuring spot size and the superior optical design of the contact probe used to collect the data.