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Rapid on-line non-destructive detection of the moisture content of corn ear by bioelectrical impedance spectroscopy

查看全文 作　　者：Zhao [1,2]Pengfei;Zhang [1,3]Hanlin;Zhao [1,3]Dongjie;Wang [1,3]Zhijie;Fan [1,3]Lifeng;Huang [1,2,3]Lan;Ma [1,3]Qin;Wang [1,2,3]Zhongyi 高影响力作者 机构地区：[1]College of Information and Electrical Engineering,China Agricultural University,Beijing 100083,China;[2]Modern Precision Agriculture System Integration Research Key Laboratory,Ministry of Education,Beijing 100083,China;[3]Key Laboratory of Agricultural Information Acquisition Technology(Beijing),Ministry of Agriculture,Beijing 100083,China高影响力机构 出　　处：《International Journal of Agricultural and Biological Engineering》索引2015年第8卷第6期,共9页高影响力期刊 基　　金：This research was supported by the Special Fund for Agro-scientific Research in the Public Interest(20120302);the Program of the Co-Construction with Beijing and the Specialized Research Fund for the Doctoral Program of Higher Education(20130008110035). 摘　　要：Moisture content of corn directly affects its quality and storage time,and the rapid on-line detection of the moisture content of corn ears not threshed or in vivo in the fields is required.Because of the special shape of corn ear,the rapid,low cost and non-destructive bioelectrical impedance measurement is more suitable for its moisture content detection.Using the four-electrode method with the Agilent E4980A precision LCR meter,the electrical impedance spectroscopies of the sweet corn ears and waxy corn ears at different moisture contents were acquired.The frequency range of the detection was from 20 Hz to 2 MHz and to enhance the contact,the attached-type electrodes were wrapped in cotton soaked with 0.1%NaCl solution.The impedance data over the frequency range from 300 Hz to 5 kHz were used to obtain the parameters of the bio-impedance Cole-Cole model.The results showed a good linear correlation(coefficient of determination R2=0.960)between the equivalent parallel resistance R∞of sweet corn ear and the moisture content value determined by standard chemical method.The research proved that the bioelectrical impedance spectroscopy can be used for detecting the moisture content of corn ear. 关 键 词：moisture content non-destructive detection bioelectrical impedance spectroscopy corn ear
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