基于FDR的土壤水分探测系统与应用

根据中国气象局对农业气象观测的要求,采用频域反射技术(Frequency Domain Reflectometry,FDR)设计开发了一套土壤水分探测系统。系统共包括传感器测量、数据采集和远程数据管理等几个部分。FDR测量原理建立在传输线理论和谐振电路的基础上。数据采集部分充分考虑了信号的抗干扰能力以及纠错措施。系统采用无线通信模式将测量数据传送到中心数据库,并使用互联网将数据发送到各个用户。运行结果表明该系统能够连续稳定地测量,经过订正之后的数据与烘干法测量结果接近,误差小于2%,满足农业气象观测的需要。

Soil Moisture Detection System Based on FDR and Its Application

In order to satisfy the needs of agrometeorological observation,a soil moisture detection system using frequency domain reflectometry(FDR)was designed.It includes FDR sensors,data acquisition and remote data management.The FDR measurement is based on transmission theory and resonance circuit, and data acquisition part takes full account of signal’s anti-interference ability and error correction methods. Data measured are transferred to central database in wireless communication mode first,and then are sent back to local stations through Internet.Results show that this system can run continuously and stably. Data revised are close to that from drying method.Errors less than 2%tell that this system can totally meet the needs of agrometeorological observation.