Studies on the measurement of grain moisture using high frequency coil (part 1) The relationship between grain moisture and inductance of coil
The aim of this study was to develop a method to measure moisture content in real-time in the drying and processing of grain. High frequency (100-1000kHz), close and limited coils were used as sensors for grain moisture. It was found that response of coil to the moisture content was affected by the...
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| Published in | Nogyo Shisetsu (Journal of the Society of Agricultural Structures, Japan) Vol. 29; no. 4; pp. 181 - 186 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English Japanese |
| Published |
The Society of Agricultural Structures, Japan
25.03.1999
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| Subjects | |
| Online Access | Get full text |
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| Abstract | The aim of this study was to develop a method to measure moisture content in real-time in the drying and processing of grain. High frequency (100-1000kHz), close and limited coils were used as sensors for grain moisture. It was found that response of coil to the moisture content was affected by the three essential elements (rolls N, diameter D and length l) and frequency. The optimal measurements of moisture content were obtained by using coil G (N=180, D=75mm, l=108mm) with 1000kHz. Relative magnetic permeability and inductance of coil varied with frequency and grain moisture. We found the regression equations between inductance and moisture for rice and wheat. In particular, when moisture was in range of 15%-30%, the moisture content could be estimated accurately, with relative error less than 2%. |
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| AbstractList | The aim of this study was to develop a method to measure moisture content in real-time in the drying and processing of grain. High frequency (100-1000kHz), close and limited coils were used as sensors for grain moisture. It was found that response of coil to the moisture content was affected by the three essential elements (rolls N, diameter D and length l) and frequency. The optimal measurements of moisture content were obtained by using coil G (N=180, D=75mm, l=108mm) with 1000kHz. Relative magnetic permeability and inductance of coil varied with frequency and grain moisture. We found the regression equations between inductance and moisture for rice and wheat. In particular, when moisture was in range of 15%-30%, the moisture content could be estimated accurately, with relative error less than 2%. |
| Author | LI, Zaigui FUJIKI, Tokumi UCHIDA, Susumu INABA, Shigeki |
| Author_xml | – sequence: 1 fullname: LI, Zaigui organization: Faculty of Agriculture, Saga University – sequence: 2 fullname: FUJIKI, Tokumi organization: Faculty of Agriculture, Saga University – sequence: 3 fullname: UCHIDA, Susumu organization: Faculty of Agriculture, Saga University – sequence: 4 fullname: INABA, Shigeki organization: Faculty of Agriculture, Saga University |
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| DOI | 10.11449/sasj1971.29.181 |
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| References | 4. 加藤宏郎 (1988): 高周波インピーダンスによる穀物の非破壊鮮度判定 (第一報). 農業機械学会誌50 (6): 99-107 8. 大岡茂 (1983): 電気物理電気回路電磁測定, P86. CQ出版社 9. 電気学会: 電気工学ポケットブック第4版, P114. 株式会社オーム社 11. 鳥居徹, 岡本嗣男, 木谷収, 落合貴之 (1992): 植物の体内水分状態の計測制御に関する研究 (第一報). 農業機械学会誌54 (6): 73-79 7. 菅野允 (1992): 電磁気計測, P108. コロナ社 12. 下原融 (1997): 穀物水分の迅速計測法. 農業機械学会誌59 (5): 123-126 3. C. V. K. Kandala, R. G. Leffler (1987): Capacitance sensors for measuring single-kernel moisture content in corn. Transactions of ASAE. 30 (3): 793-797 5. 農産物物性研究グループ: 農産物物性研究. 農業機械学会. 東京. 第1集～第4集 6. 伴敏三 (1975): 人工乾燥における穀物水分の電気的検出に関する研究. 農業機械化研究所報告11号, 1-58 10. C. K. Hwan, 青木明善ら (1990): 籾の誘電特性の測定. 農業施設20 (3): 254-269 1. S. O. Nelson, K. C. Lawrence, C. V. K. Kandala (1990): Comparison of impedance and DC conductance sensing for single-kernel moisture measurement in corn. Transactions of ASAE 33 (2), 637-641 2. S. O. Nelson (1984): Density dependence of the dielectric properties of particulate materials. Transactions of ASAE 26 (6), 1823-1825 |
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| SubjectTerms | coil high frequency inductance moisture content measurement relative magnetic permeability |
| Subtitle | The relationship between grain moisture and inductance of coil |
| Title | Studies on the measurement of grain moisture using high frequency coil (part 1) |
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