| 蜜瓜和西瓜果汁的射频介电特性及其与糖度的关系(简报) |
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| 引用本文： | 郭文川,Stuart O. Nelson,Samir Trabelsi,Stanley J. Kays.蜜瓜和西瓜果汁的射频介电特性及其与糖度的关系(简报)[J].农业工程学报,2008,24(5). |
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| 作者姓名： | 郭文川 Stuart O. Nelson Samir Trabelsi Stanley J. Kays |
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| 作者单位： | 西北农林科技大学机械与电子工程学院，杨凌 712100;U.S. Department of Agriculture, Agricultural Research Service, Russell Research Center, Athens, Georgia 30604, USA;U.S. Department of Agriculture, Agricultural Research Service, Russell Research Center, Athens, Georgia 30604, USA;Department of Horticulture, University of Georgia, Athens, Georgia 30602, USA |
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| 摘 要： | 为了解果汁的介电特性与其主要内部品质——糖度之间的关系，该文利用末端开路的同轴探头和阻抗分析仪测量了10 MHz～1.8 GHz的频率范围内不同成熟度的3个品种密瓜汁和4个品种西瓜汁的介电特性，同时测量了反映果汁糖度的可溶性固形物含量和果肉的含水率，分析了介电特性和糖度间的关系。结果显示：密瓜和西瓜果汁的相对介电常数和介质损耗因数皆随频率的增大单调减小，品种间的差异对介电特性有影响；1.8 GHz下密瓜汁的损耗角正切与糖度有较好的线性关系，其决定系数为0.784，但西瓜汁的介电特性与糖度的相关性较差；密瓜和西瓜果汁的糖度与果肉的含水率有很好的线性相关性，其决定系数分别为0.973和0.906。该研究将为基于介电特性的果汁糖度检测仪的开发提供了研究基础。
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| 关 键 词： | 蜜瓜 西瓜 果汁 介电特性 可溶性固形物含量 含水率 |
| 收稿时间： | 2007/3/23 0:00:00 |
| 修稿时间： | 5/4/2008 12:00:00 AM |
Radio Frequency(RF) dielectric properties of honeydew melon and watermelon juice and correlations with sugar content |
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| Abstract: | In order to understand the relationship between dielectric properties and sugar content of juices, dielectric properties of juice of three honeydew melon cultivars and four watermelon cultivars with different maturities were measured with an open-ended coaxial-line probe and impedance analyzer over the frequency range from 10 MHz to 1.8GHz. Soluble solids content of fruit juice and moisture of fruit pulp were also measured. The correlation between dielectric properties and soluble solids content was analyzed. Results show that the dielectric constant and loss factor of fruit juice decrease monotonically as frequency increase, and they are influenced by the difference of cultivars. The best linear relationships, with the coefficients of determination of 0.784, are found between loss tangent and soluble solids content for honeydew melons at 1.8 GHz. Better correlation is not noticed between dielectric properties and soluble solids content of watermelons. Obvious linear relationships between soluble solids content and moisture are found in honeydew melons and watermelons, with coefficients of determination of 0.973 and 0.906, respectively. Hope the research offer some useful information in developing sugar sensors for juice based on dielectric properties. |
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| Keywords: | honeydew melon watermelon juice dielectric properties soluble solids content moisture |
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