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Lumber moisture evaluation by a reflective cavity photothermal technique

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1051/rphysap:019880023090156500
AuthorSearch for: 1; Search for: 1; Search for: 1
Affiliation
  1. National Research Council of Canada
FormatText, Article
Subjectmoisture measurement; nondestructive testing; photothermal effects; reflective cavity photothermal technique; nondestructive quality control; industrial materials; moisture; unseasoned lumber; drying mill process control; surface temperature rise; laser radiation
Abstract
Photothermal methods constitute a convenient approach for the nondestructive quality control of industrial materials because they are rapid and noninvasive. One such application is the monitoring of moisture in unseasoned lumber for drying mill process control. This paper describes a photothermal method for the analysis of moisture in wood by measuring its surface temperature rise under laser radiation. It is shown that this parameter is much more sensitive than thermal diffusivity to moisture content variations. A reflective cavity technique is used to increase both the absorptivity and the emissivity of the inspected surface in order to improve the measurement reliability. Results obtained with an off-center hemispherical cavity on wood samples of different moisture content are presented and discussed.
Publication date
PublisherEDP SCiences
In
  • Revue de Physique Appliquée 23, no. 9: 1565–1576.
LanguageEnglish
Peer reviewedYes
NRC numberNRCC 28664
NRC-IGM88AP-404-682-G
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Record identifier321cf7d0-41c6-4294-ab9b-7c97fa9ac13a
Record created2020-05-02
Record modified2020-05-08
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