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Application of Impedance Measurement Using Noise-FFT to Monitoring of Physical Properties of Cellular Agricultural Products

噪声 FFT 阻抗测量在细胞农产品物理特性监测中的应用

基本信息

批准号：
06806029
负责人：
TOYODA Kiyohiko
金额：
$ 1.22万
依托单位：
Kobe University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

Agricutural products composed of cellular tissues can be macroscopically regarded as systems in which cell membranes electrically isolate intracellular electrolytes from extra cellular ones ; a process which causes the movement of electrolytes or moisture through cell membranes can be detected using an impedance spectroscopic method with an electrical equivalent model.In this study, an impedance measurement based on the FFT algorithm was applied to the analyzes of the relationship between the heat and mass transfer properties of cellular agricultural products and the parameters in an electrical equivalent model through the experiments of heating and drying.The impedance of vegetables and fruits could be expressed as two series arcs corresponding to beta_1 and beta_2 dispersions in the complex plane called the Cole-Cole plot. The first arc observed at the lower frequency than 100kHz was successfully predicted by the modified Hayden model.An increase in the extra cellular resistance in the model showed a good correlation with a decrease in moisture content of a carrot root during drying. Thus, the impedance measurement can be applied for monitoring the moisture of the agricultural products during drying.The temperature of the potato tubers during heating was successfully estimated by the extra cellular and intracellular resistance at the lower temperature than 50ﾟC.At the higher temperature than 50ﾟC,gelatinization of the starch granular in the cells caused the movement of electrolytes inside a cell to the outside. Therefore, the gelatinization could be also detected by the impedance measurement.Through the results, it was concluded that the model of the physical properties of the cellular agricultural products should be developed based on the properties of the inside-cell and outside-cell components and the configuration of them in a cellar material.

农产品是由细胞组织构成的，宏观上可以看作是细胞膜将细胞内电解质与细胞外电解质电隔离的系统;一种导致电解质或水分通过细胞膜的运动的过程可以使用具有电等效模型的阻抗光谱方法来检测。在这项研究中，采用基于FFT算法的阻抗测量方法，通过加热干燥实验，分析了多孔农产品的传热传质特性与电等效模型参数之间的关系，蔬菜和水果的阻抗可以表示为复平面中对应于β_1和β_2色散的两个系列弧，称为Cole-Cole图。修正的Hayden模型成功地预测了在低于100kHz的频率下观察到的第一个电弧，模型中细胞外阻力的增加与胡萝卜根在干燥过程中含水量的降低具有良好的相关性。在低于50 ℃的温度下，利用细胞外电阻和细胞内电阻成功地估计了马铃薯块茎在加热过程中的温度。在高于50 ℃的温度下，细胞内淀粉颗粒的糊化引起细胞内电解质向外移动。结果表明，细胞农产品的物理特性模型应根据细胞内外组分的特性及其在窖内的形态来建立。