title: Chemical analysis of wood chips in motion using thermal-emission mid-infrared spectroscopy with projection to latent structures regression.
abstract: The opacity and random surface orientation of process streams of solids complicates the application of spectroscopy to on-line analysis of solid streams. We have used a specialized form of thermal-emission mid-infrared spectroscopy, called transient infrared spectroscopy, combined with PLS regression to analyze a moving stream of wood chips for lignin, hemicellulose, glucan, and extractives content. Sixty-eight softwood samples from 6 species were analyzed using one regression, and 28 hardwood samples from 14 species were analyzed with another. Root-mean-square errors of prediction for the properties varied from 0.8 to 1.9 wt %, depending on property and wood type, with lignin and hemicellulose being the most accurately determined and glucan being the least.
authors.affiliation: Ames Laboratory, Iowa State University, 50011, USA. jonesrw@ameslab.gov
authors.forename: Roger W
authors.initials: RW
authors.lastname: Jones
authors.forename: Robert R
authors.initials: RR
authors.lastname: Meglen
authors.forename: Bonnie R
authors.initials: BR
authors.lastname: Hames
authors.forename: John F
authors.initials: JF
authors.lastname: McClelland