作者：唐洋, 李光林

作者单位：西南大学工程技术学院, 重庆 400716

关键词：土壤水分; 电场; 传感器; 介电常数

摘要：

合适的土壤水分是作物良好生长和获得高产的条件之一,同时合理灌溉也是节约水资源的有效途径。基于电场法原理研制了测试土壤水分含量的传感器,并利用单片机实现自动控制。通过与烘干法对比研究,该传感器在土壤水分含量小于25%时实验误差小于5%,完全能满足农业生产需要。该传感器使用稳定安全,便于携带,能定点实时监测,精度较高,具有实用价值。

Study on a soil moisture sensor based on electric field

TANG Yang, LI Guang-lin

College of Engineering and Technology, Southwest University, Chongqing 400716

Abstract: Proper moisture of soil is one of the necessary conditions for crop's growth and high yield. Meanwhile, reasonable irrigation is an effective way for saving water resources. In this paper, a sensor that is automatically controlled by a microchip was developed for soil moisture measurement based on electric field method Compared with the study of drying and weighing method, the measurement error of the sensor for soils with water content below 25% is less than 5%, indicating that it can meet the requirement of farming satisfactorily. In addition, the sensor is stable, safe, and portable, thus is promising to be used for in-situ measurement of soil moisture.

Keywords: Soil moisture; Electric field; Sensor; Dielectric constant

2010, 36(2): 91-93  收稿日期: 2009-10-11;收到修改稿日期: 2009-12-24

基金项目: 重庆市自然科学基金项目(2007BB7306)

作者简介: 唐洋(1985-),男,四川安岳县人,硕士研究生,专业方向为电子技术应用。

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