土壤水分测量仪的设计 design of the instrument to measure the soils moisture.pdfVIP

己口口7年l己月 土壤水分测量仪的设计 魏勋卢洪武 (山东师范大学传播学院 济南 250014) 摘要：精确测量土壤中水分的含量在农业生产和科研中，对于提高粮食产量、减少损失有着重要的作用。本测量仪主要利 用电容式传感器的电压随其电介质的值改变而变的特性。本测量仪核心控制部件是M(§51单片机系统，通过压／频转换 VF℃电路实现单片机系统和电容式传感器之间的信息传输，运算处理后的测量结果通过I。ED显示器显示。该系统结构简单 且测量精度高，便于设计和操控，在土壤水分测量领域有较高的应用价值。 关键词：土壤；水分；测量；电容式传感器；单片机 中图分类号：TP216文献标识码：A oftheinstrumenttomeasurethesoil’smoisture Design WeiXunLu Hongwu Nomal 250014) (CoUeageof(乃mmunication，ShandongUniversity，Jinan AbstI_ct：Exactlymeasurethesoil’smoisturecanincreasethefoodstuff’soutputanddecreasethelosses，whichisvery bothin andscientificresearch．Thisinstrumentmainlyusethesensorof and importantagriculture’sproduce capacitance itsdielectric’s to the ofthe maincontrolofthis thtIoughchange quantitychangevoltagecapacitance．Thepart isthe of the and circuitto the system convert achieve transferbetween singlechip，throughvoltagefrequency message’s the of andthesensorof the of the system resultthe sin91echip capacitance．Finallysystemsin91echipdisplayoperateby Diode．The ofthis isnot and to butthemeasureresultis I。ight—Emitting configurationsystem easy onlysimple design pre— cious．Thisinstrumentwillhave valueinthefieldofmeasurementinthesoil’smoisture． great of Keywords：soil；moisture；measure；sensorcapacitance；singlechip