Determination of Moisture Content in Mortar at Near Relaxation Frequency 17 GHz
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Dec 21, 2011
About this article
Published Online: Dec 21, 2011
Page range: 203 - 206
DOI: https://doi.org/10.2478/v10048-011-0031-0
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The knowledge of moisture content in cement based material is important especially for the safety in field work. In this paper, a non-destructive and contactless free space method is used for measurement of moisture content in cement based materials (mortar) at microwave frequencies. The measurement system consists of a 17 GHz dielectric resonator oscillator (DRO) as a microwave source, a Power Meter as the detector, and a pair of lens horn antennas to transmit and receive the microwave signal. An empirical formula of moisture content was obtained by using a relationship between attenuation and moisture content. This model is best for prediction of moisture content greater than 2% with percentage mean error of 3%.