Dielectric Characteristics of Rough Rice during Drying Process by Using Time Domain Reflectometry

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  • 時間領域反射法で計測した乾燥過程における籾の比誘電率特性
  • ジカン リョウイキ ハンシャホウ デ ケイソクシタ カンソウ カテイ ニ オケル モミ ノ ヒ ユウデンリツ トクセイ

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Abstract

The objective of this study is to examine the dielectric characteristics of rough rice during the drying process by using time domain reflectometry (TDR) to monitor the wetness of rough rice. Highly moistened rough rice (33.9%-36.8% w.b.) was gradually air-dried, and the TDR waveform during the drying process was monitored by using conventional two-wire and short-ended TDR probes. In the drying process, the moisture content (m) of rough rice decreased gradually with the passage of time and finally attained a value of 11.9% w.b. accompanied by 5% volume shrinkage. Although the TDR waveforms obtained with each probe clearly revealed different traces, the relative permittivity (ε) evaluated from these waveforms generally increased with the moisture content. The high correlation between m and ε (R2=0.95) demonstrates that the m value can be estimated from ε obtained from TDR with sufficient accuracy. To achieve greater accuracy of measurement, a short-ended probe would be more appropriate than a conventional two-wire probe because the former has high sensitivity to changes in ε.

Journal

  • Shokubutsu Kankyo Kogaku

    Shokubutsu Kankyo Kogaku 20 (1), 14-20, 2008

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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