基于相位检测的高盐碱与高有机土壤水分传感器研究  

Study of Moisture Sensor for High Saline-alkali Soil and High Organic Soil Based on Phase Detection

作　　者：赵燕东[1,2] 高超[1,2] 刘卫平[1,2] 王勇志[1,2] 

机构地区：[1]北京林业大学工学院,北京100083 [2]北京林业大学城乡生态环境北京实验室,北京100083

出　　处：《农业机械学报》2015年第9期151-158,共8页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(31371537);北京市共建项目专项资助项目

摘　　要：为解决高盐碱土壤与高有机土壤水分实时检测难题,研究了一种基于相位检测的时域传输(TDT)型土壤水分检测方法,并对传感器的探头结构、测量频率进行了分析。通过试验分析可知:当探针直径为2 mm、两针间距为10 mm、针长120 mm、测量频率为100 MHz时,在砂壤土、粘壤土、盐碱土、高有机土中的测量误差分别为±0.87%、±0.95%、±2.20%、±1.94%,动态响应时间约为4ms左右,测量性能较好,满足实际测量需要。通过与国外设备TRIME(TDR)及国产设备BD-Ⅲ型土壤水分传感器的对比研究,得出测量频率100 MHz时的TDT型土壤水分传感器能够满足高盐碱土壤、高有机土壤水分实时检测的要求,具有良好的动态性能和稳定性,且技术难度较小、成本低,有着很好的研究和应用前景。To solve the problem of moisture real-time detection in high saline-alkali soil and high organic soil, this paper used time domain transmission （TDT） method to detect soil moisture based on phase detection. The probe of sensor structure and measuring frequency were analyzed in detail. The experiments showed that when the probes were 2 mm in diameter, 10 mm in interval, 120 mm in length and the frequency was 100 MHz, the measured performance was good to meet the demands of actual measurement. The measurement error of TDT soil moisture sensor in sandy loam, clay loam, saline-alkali soil and high organic soil were ＋0. 87% , ＋0. 95% , _＋2.20% and _＋ 1.94% respectively, and the dynamic response time of TDT soil moisture sensor was about 4 ms. The comparative analysis between foreign equipment TRIME （TDR） and domestic equipment BD-m type soil moisture sensor showed that TDT soil moisture sensor of 100 MHz could meet the requirements for detecting high saline-alkali soil and high organic soil moisture in real-time. In addition, this device has good dynamic performance and stability with less technical difficulty and low cost but for good research and application prospects.

关 键 词：土壤水分 相位检测 传感器 时域传输 高盐碱土壤 高有机土壤 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]