Moisture measurement of timber using microwave attenuation at two frequencies

Seichi Okamura; Yangjung Zang; Tomoki Kurematsu

doi:10.1117/12.365725

15 October 1999 Moisture measurement of timber using microwave attenuation at two frequencies

Seichi Okamura, Yangjung Zang, Tomoki Kurematsu

Proceedings Volume 3752, Subsurface Sensors and Applications; (1999) https://doi.org/10.1117/12.365725
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

This paper describes a new method for measuring moisture content distribution of timber using only attenuation at two microwave frequencies. The experiment showed that the setup of transmission type operating at 9 and 12 GHz measured moisture contents of some timbers of different kinds having various thickness and density without any knowledge about the thickness and the density. Four timbers of three species having different thickness and density were measured by the method. The result showed that the setup based on the method measured samples with the timbers mentioned above. The measurable range of moisture content was below 20% in dry basis and the mean value of error was 2.3%, and the maximum error was 7.7% using a calibration curve expressed with a third polynomial equation.

Citation Download Citation

Seichi Okamura, Yangjung Zang, and Tomoki Kurematsu "Moisture measurement of timber using microwave attenuation at two frequencies", Proc. SPIE 3752, Subsurface Sensors and Applications, (15 October 1999); https://doi.org/10.1117/12.365725

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