| 基于FDC1004的电容式谷物水分检测仪的设计 |
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| 引用本文： | 徐冬平,张鹏鹏,孙诗裕.基于FDC1004的电容式谷物水分检测仪的设计[J].农机化研究,2016(8):173-178. |
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| 作者姓名： | 徐冬平 张鹏鹏 孙诗裕 |
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| 作者单位： | 南京工业大学自动化与电气工程学院,南京,211816 |
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| 基金项目： | 国家自然科学基金项目(61350008);国家星火计划项目(2012GA690166);江苏省高校产业化推进项目(JHB2012-55) |
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| 摘 要： | 提出了一种利用谷物介电特性快速测量谷物含水率的方法,采用同心圆筒电容传感器,对传感器做屏蔽干扰处理。运用Texas Instruments公司最新的电容数字转换芯片FDC1004,具有测量精度高电路简单及抗干扰等特点。加入NTC温度传感器对测量电路进行温度补偿,人机通过按键交互,测量结果通过LCD屏幕显示。系统核心器件采用单片机MSP430F5528,具有低功耗及运算速度快的优点。系统采用4.2V可充电蓄电池供电,系统的测量范围为5%~35%。标定后的系统经验证测试得测量平均误差为0.85%,符合设计要求。
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| 关 键 词： | 水分检测仪 谷物 介电特性 电容传感器 温度补偿 低功耗 |
Design of a Grain Moisture Detector Based on Dielectric Character |
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| Xu Dongping;Zhang Pengpeng;Sun Shiyu.Design of a Grain Moisture Detector Based on Dielectric Character[J].Journal of Agricultural Mechanization Research,2016(8):173-178. |
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| Authors: | Xu Dongping;Zhang Pengpeng;Sun Shiyu |
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| Institution: | Xu Dongping;Zhang Pengpeng;Sun Shiyu;Department of Automation and Electrical Engineering,Nanjing University of Technology; |
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| Abstract: | This article aims to present a rapid method of grain moisture measurement based on dielectric character .The capacitor sensor is composed of two metal barrels with the same center but different radiuses , deals with cutting out dis-tractions .As the core of the capacitance measurement circuit , the device of FDC1004 which is a 24-Bit Capacitance-to-Digital Converter , minimizes the peripheral components and increase the accuracy .The system interface through the keys , with the NTC temperature sensor circuit working as temperature compensation and displaying results on the LCD . The MCU of this system is MSP430 F5528 working with low-power .The measurement is powered by a storage battery of 4.2 volt , and the range of measurement is 5%~35%.After the calibration experiment ,the average error was 0.85%, meeting the requirements of the design . |
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| Keywords: | moisture detector grain dielectric property capacitive sensor temperature compensation low-power Dis-sipation |
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