传感技术学报Issue(6)：779-784,6.DOI:10.3969/j.issn.1004-1699.2013.06.005
基于信号波形幅度检测放大技术的电容式土壤水分传感器研究
Development of a Capacitive Soil Moisture Sensor Based on Wave Amplitude Detection and Amplification
摘要
Abstract
Measurement of soil water content is essential for evaluation and selection of agro-systems, and for the reasonable use of water resources. According to the relationship between soil water content and soil relative permittivity,a new type of capacitive soil moisture sensor is presented based on the wave amplitude detection and am-plification. The sensor was tested in solution samples,clay loam,sandy loam and clay soils. Results show that there is a very linear relationship between sensor output voltage and water content of the measured medium(R2 is from 0. 81 to 0. 99). The sensor should be calibrated before being put into applications because the sensitivity of the sensor varies significantly with soil texture. The power consumption of the sensor is lower than 8 mW under an operating voltage of 2. 5 V. The sensor can be extended to real-time measurement of soil moisture in precise agricultural systems.关键词
土壤水分传感器/电容法/信号波形幅度检测放大技术/低功耗设计Key words
soil moisture sensor/capacitance method/wave amplitude detection and amplification/low-power design分类
信息技术与安全科学引用本文复制引用
徐燕,易卫东,卓国文..基于信号波形幅度检测放大技术的电容式土壤水分传感器研究[J].传感技术学报,2013,(6):779-784,6.基金项目
“十二五”农村领域国家科技计划项目(2012BAJ24B01) （2012BAJ24B01）
中国科学院百人计划项目(99T300CEA2) （99T300CEA2）
