Frequency Optimization for Dynamic Measurements of Wide-range Moisture Content using Microwave
نویسندگان
چکیده
This paper describes dynamic and static measurement methods for wide-range moisture content of agricultural products such as rice and silage. The proposed method uses the attenuation and phase shift of the microwave transmitted signal through a microstrip transmission line (MSTL) sensor. The results of dynamic measurements of rice samples with low moisture content(< 18 %) showed close agreement with those of static measurements. Furthermore, the proposed method showed possibility to measure the silage samples with high moisture content (69.8 % to 79.5 %). To optimize the measurement frequency, the linearity between moisture content and slope (dB/radian) were evaluated. As a result, the best linearity was obtained at 2.46 GHz. Keyword Dynamic measrurement, Microstrip transmission line, Microwave, Transmission characteristics, Phase shift, Moisture content
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