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Shaft-Mounted Time Domain Reflectometry Probe for Water Content and Electrical Conductivity Measurements

^a Dep. of Water Resources Engineering, Lund University, Box 118, SE-221 00 Lund, Sweden
^b Land Resources and Environmental Sciences, Montana State University, P.O. Box 173120, Bozeman, MT 59717-3120

View larger version (22K): [in a new window]   Fig. 1. Design schematic for the SMP2 shaft-mounted TDR probe. All lengths are in millimeters.

View larger version (22K): [in a new window]   Fig. 2. Measured effective shaft-mounted TDR probe (SMP) dielectric constant Ka vs. reference probe Ka, including best-fit calibration lines from Table 1, in seven different fluids and air.

View larger version (16K): [in a new window]   Fig. 3. Standard deviation of estimated target media dielectric constant Ksurr based on measured shaft-mounted TDR probe (SMP) Ka and Eq. [1], along with standard deviations for the two 0.20-m-long reference TDR probes. All standard deviations are based on 15 measurements for each probe.