Response of ECH2O Probe and TDR Probe in the Determination of Dielectric Characteristics of Rough Rice during Drying Process

E. Yasunaga, H. Miyamoto, S. Yoshida, J. Chikushi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    1 Citation (Scopus)

    Abstract

    The purpose of this study is to examine the dielectric characteristics of rough rice during the drying process by using ECH2O probe and TDR probe for monitoring the moisture content of rough rice. Re-wetted rough rice was gradually air-dried, and the ECH2O and TDR waveform during the drying process were monitored by using EC-5 and EC-TE ECH2O probes and conventional two-wire and short-ended TDR probe, across a range of measurement frequencies 70 MHz for ECH2O probe and around 1GHz for TDR probe. In the drying process, the moisture content (m) of rough rice decreased gradually with the passage of time and finally attained about 11-15% w.b. accompanied by about 5% volume shrinkage. The relative dielectric constant (ε) evaluated from these waveforms obtained by TDR generally increased with the moisture content. The high correlation between m and ε demonstrates that the m value can be estimated from ε obtained from these probes with sufficient accuracy. A high correlation between m and mcal could be established. The term mcal stands for moisture content obtained from the equation that expressed the relation between m and ε.

    Original languageEnglish
    Title of host publicationActa Horticulturae
    PublisherInternational Society for Horticultural Science
    Pages371-376
    Number of pages6
    ISBN (Print)9789066055629
    DOIs
    Publication statusPublished - Jan 1 2009

    Publication series

    NameActa Horticulturae
    Volume837
    ISSN (Print)0567-7572

    All Science Journal Classification (ASJC) codes

    • Horticulture

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