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Comments on "Time Domain Reflectometry Laboratory Calibration in Travel Time, Bulk Electrical Conductivity, and Effective Frequency"

Institute of Chemistry and Dynamics of the Geosphere, Institute IV: Agrosphere, Forschungszentrum Jülich, 52425 Jülich, Germany

View larger version (18K): [in a new window]   Fig. 1. Time domain reflectometry waveforms simulated with the same system parameters (L = 0.20 m and Z0 = 225 ) but different input signals based on measurements of six different open-ended TDR cables 1, 5, 10, 15, 20, and 25 m long. Arrows indicate the minimum reflection coefficient used to calculate the probe impedance in Eq. [4].

View larger version (14K): [in a new window]   Fig. 2. Apparent probe impedance calculated with Eq. [4] from simulated waveforms with different cable and probe lengths. The actual probe impedance was held constant at 225 during all simulations.

View larger version (18K): [in a new window]   Fig. 3. Bulk conductivity estimates based on Eq. [1] to [3] and the apparent or true probe impedance for a 0.2-m TDR probe for simulated TDR waveforms with varying bulk conductivity (input function based on TDR measurements using a 10-m-long open-ended cable).