An in situ probe-spacing-correction thermo-TDR sensor to measure soil water content accurately
An in situ probe-spacing-correction thermo-TDR sensor to measure soil water content accurately
复制标题
用于精确测量土壤水分含量的原位探头间距校正热 TDR 传感器
DOI：
10.1111/ejss.12718
复制
发表时间：
2018
影响因子：
4.2
通讯作者：
Noborio K.
中科院分区：
文献类型：
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作者：
Wen M. M.;Liu G.;Horton R.;Noborio K.
为了降低探头偏转的可能性，传统的热时域反射（T-TDR）传感器具有相对较短的探头长度（≤4 cm）。然而，短探头会导致TDR估算的土壤含水量（θv）误差较大。在本研究中，研究了两个新的6厘米长探头间距校正T-TDR（CT-TDR）传感器。与传统的4 cm长T-TDR传感器相比，6 cm长的CT-TDR传感器减少了TDR估计θv的误差。当实施线性或非线性探头间距校正算法时，由于探头偏转而导致的热脉冲（HP）估计θ v的误差减少。与传统的4 cm长的T-TDR传感器相比，6 cm长的CT-TDR传感器提供了更精确的θ估算。亮点短的热-TDR传感器在确定土壤含水量方面存在不足。可以原位确定由偏转引起的热-TDR探头间距的变化。校正改变的热-TDR探头间距可以准确地确定土壤含水量。6 cm长的热-TDR传感器比4 cm长的传感器更准确地确定土壤含水量。
To reduce the possibility of probe deflections, conventional thermo‐time domain reflectometry (T‐TDR) sensors have relatively short probe lengths (≤4 cm). However, short probes lead to large errors in TDR‐estimated soil water content (θv). In this study, two new 6‐cm‐long probe‐spacing‐correction T‐TDR (CT‐TDR) sensors were investigated. Compared with conventional 4‐cm‐long T‐TDR sensors, the 6‐cm‐long CT‐TDR sensors reduced errors in TDR‐estimatedθv. Errors in heat pulse (HP)‐estimatedθvbecause of probe deflections were reduced when linear or nonlinear probe‐spacing‐correction algorithms were implemented. The 6‐cm‐long CT‐TDR sensors provided more accurateθvestimations than do the conventional 4‐cm‐long T‐TDR sensors.HighlightsShort thermo‐TDR sensor has shortcomings in determining soil water content.Changes in thermo‐TDR probe spacing caused by deflections can be determinedin situ.Correcting changed thermo‐TDR probe spacing determined soil water content accurately.The 6‐cm‐long thermo‐TDR sensors determined soil water content more accurately than 4‐cm‐long sensors.