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Title: Microwave moisture measurement for wood drying

Abstract

The goal of this project was to develop a prototype moisture sensor system suitable for a hardwood dry kiln based on the microwave transmission measurements of the complex dielectric constant of the wood. In this project, prototypes of two designs of microwave-based moisture sensor probes (launchers) working in the frequency range from 4.5 GHz to 6 GHz were developed and tested. A prototype set of battery powered electronics that both provides the microwave excitation and records the amplitude and phase of the returned signal after passing through the wood was built and tested. The sensors and electronics built in this project allow a swept frequency microwave transmission measurement through a small area of a board. Using the prototype electronics and launchers, measurements of moisture content (MC) over a range of 6 percent to 70 percent MC for red oak and 6 percent to 100 percent for yellow-poplar with standard deviations of less than 1.5 percent MC have been obtained.

Authors:
 [1];  [2];  [2];  [2];  [2]
  1. University of Tennessee, Knoxville (UTK)
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
932167
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Forest Products Journal; Journal Volume: 57; Journal Issue: 10
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS; AMPLITUDES; DRYING; EXCITATION; FREQUENCY RANGE; KILNS; MOISTURE; OAKS; PROBES; WOOD

Citation Formats

Moschler, William W, Hanson, Gregory R, Gee, Timothy Felix, Killough, Stephen M, and Wilgen, John B. Microwave moisture measurement for wood drying. United States: N. p., 2007. Web.
Moschler, William W, Hanson, Gregory R, Gee, Timothy Felix, Killough, Stephen M, & Wilgen, John B. Microwave moisture measurement for wood drying. United States.
Moschler, William W, Hanson, Gregory R, Gee, Timothy Felix, Killough, Stephen M, and Wilgen, John B. Mon . "Microwave moisture measurement for wood drying". United States. doi:.
@article{osti_932167,
title = {Microwave moisture measurement for wood drying},
author = {Moschler, William W and Hanson, Gregory R and Gee, Timothy Felix and Killough, Stephen M and Wilgen, John B},
abstractNote = {The goal of this project was to develop a prototype moisture sensor system suitable for a hardwood dry kiln based on the microwave transmission measurements of the complex dielectric constant of the wood. In this project, prototypes of two designs of microwave-based moisture sensor probes (launchers) working in the frequency range from 4.5 GHz to 6 GHz were developed and tested. A prototype set of battery powered electronics that both provides the microwave excitation and records the amplitude and phase of the returned signal after passing through the wood was built and tested. The sensors and electronics built in this project allow a swept frequency microwave transmission measurement through a small area of a board. Using the prototype electronics and launchers, measurements of moisture content (MC) over a range of 6 percent to 70 percent MC for red oak and 6 percent to 100 percent for yellow-poplar with standard deviations of less than 1.5 percent MC have been obtained.},
doi = {},
journal = {Forest Products Journal},
number = 10,
volume = 57,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}