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基于相位检测原理的土壤水分时域反射测量技术

DOI: 10.3969/j.issn.1000-1298.2010.1.014

Keywords: 土壤含水量,介电常数,时域反射,相位检测

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Abstract:

针对土壤水分测量的特点,提出了用高频正弦波代替脉冲信号作为测试信号,利用相位检测原理测量信号传播时间,从而测量土壤含水量的方法。设计了由高频信号发生器、相位检测器、微处理器和土壤水分探头等组成的P〖CD*2〗TDR原理样机。试验表明,该样机测量信号传播时间的精度可达到10ps,在砂土、壤土和粘壤土中的土壤含水量测量结果与称重法对比差值不超过003。

References

[1]  Jones S B,Wraith J M,Or D,Time domain reflectometry measurement principles and applications,Hydrological Processes,2002(1).
[2]  Robinson D A,Jones S B,Wraith J M,A review of advances in dielectric and electrical conductivity measurement in soils using time domain reflectometry,Vadose Zone Journal,2003(4).
[3]  Topp G C,Davis J L,Annan A P,Electromagnetic determination of soil water content:measurements in coaxial transmission lines,Water Resources Research,1980(3).
[4]  Roth K,Schulin R,Fluhler H,Calibration of time domain reflectometry for water content measurement using a composite dielectric approach,Water Resources Research,1990(10).
[5]  Quinones H,Ruelle P,Nemeth I,Comparison of three calibration procedures for TDR soil moisture sensors,Journal of Irrigation and Drainage,2003(3).
[6]  Mojid M A,Wyseure G,Rose D A,The use of insulated time-domain reflectometry sensors to measure water content in highly saline soils,Irrigation Science,1998(2).
[7]  赵燕东.王一鸣 基于驻波率原理的土壤含水率测量方法 [J].-农业机械学报2002(4)
[8]  冯炜.纪奕才.沈绍祥.方广有 测试土壤含水率和电导率的时域反射仪系统 [J].-农业机械学报2009(5)

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