Shaft-Mounted Time Domain Reflectometry Probe for Water Content and Electrical Conductivity Measurements
- Magnus Persson *a and
- Jon M. Wraithb
A new shaft-mounted time domain reflectometry (TDR) probe design is described and evaluated. In contrast to previous shaft-mounted TDR probes (SMPs), the new design may be used to measure both dielectric constant (K a) and bulk electrical conductivity (σa). Two SMP prototypes, 0.03 and 0.04 m long and having diameters of 0.006 m, were evaluated. The probes were calibrated in several fluids having different K a and σa A primary advantage of the SMP is minimal physical probe length without sacrificing accuracy of K a readings. Accuracy of K a measurements for the new probes was similar to that of standard 0.20-m-long three-rod probes.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © 2002. Published in Vadose Zone Journal1:316–319.