Electric Impedance Characteristics of ‘Shiitake’ Mushrooms during Drying

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  • 乾燥中のシイタケ子実体の電気インピーダンス特性
  • カンソウ チュウ ノ シイタケ シジツタイ ノ デンキ インピーダンス トクセイ
  • Electric Impedance Characteristics of ‘Shiitake’ Mushrooms during Drying

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Abstract

For the purpose of monitoring the interior state of ‘Shiitake’ mushrooms during drying, especially for estimating the moisture conditions, electric impedance of the cap was measured in a frequency range of 42Hz to 5MHz and in a moisture range of 133.1% d.b. to 1671% d.b.<br>Cole-Cole plots showed that the circular-arc shape in the plot-curve characteristic of agricultural products disappeared as drying progressed.<br> The dependency relationship plots of logarithmic resistance to moisture content were divided into two parts at the turning point; showed linear relationships and the other exponential. A moisture estimating formula at 42 Hz of measuring frequency was proposed and its parameters were calculated by the non-linear curve fitting method. The formula had an estimation error of 10.0% in the higher moisture region of more than 590.2%, d.b. and 17.4% in the areas with a moisture content below that threshold on an average relative error basis.

Journal

  • Shokubutsu Kankyo Kogaku

    Shokubutsu Kankyo Kogaku 18 (3), 206-211, 2006

    Japanese Society of Agricultural, Biological and Environmental Engineers and Scientists

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