What is a Time Domain Reflectometer (TDR)?

Definition of Time Domain Reflectometers (TDR).

Time Domain Reflectometers (TDR) are advanced soil water content sensors. When implemented properly, TDR sensors provide superior water content sensing over other electronic soil moisture sensors because of their insensitivity to soil electrical conductivity.

This insensitivity occurs because only the temporal events of the waveform are analyzed. Waveform amplitude, which is highly affected by soil EC, is effectively eliminated in the determination water content and permittivity.

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