DocumentCode
1977003
Title
Microwave Instrument for Accurate Moisture Measurement of Timber
Author
Tiuri, M. ; Heikkilä, S.
Author_Institution
Helsinki University of Technology, Otakaari 5 A, 02150, ESPOO 15, Finland
fYear
1979
fDate
17-20 Sept. 1979
Firstpage
702
Lastpage
705
Abstract
In this report a new instrument developed for moisture measurement of timber is described. In order to determine the dependence of the dielectric properties of moisture many measurements of the properties of timber were performed at 10 GHz. The results showed that the attenuation through timber is dependent on moisture content, on density, and on temperature. In the developed instrument the attenuation of timber is measured at 10 GHz, the density is determined by ¿-ray attenuation and the temperature by an infrared detector. A microprocessor calculates the moisture content. Field tests have shown that the correlation coefficient between the moisture content determined by the instrument and measured directly is 0.993 and the standard deviation of the moisture per cent is 0.68.
Keywords
Attenuation measurement; Density measurement; Dielectric measurements; Infrared detectors; Instruments; Microprocessors; Moisture measurement; Performance evaluation; Temperature dependence; Testing;
fLanguage
English
Publisher
ieee
Conference_Titel
Microwave Conference, 1979. 9th European
Conference_Location
Brighton, UK
Type
conf
DOI
10.1109/EUMA.1979.332663
Filename
4131437
Link To Document