TDR200-Based Time-Domain Reflectometry System
18
probe rods. The attenuation of the signal can affect the accuracy and resolution
of water content measurements.
presents a series of waveforms when a solution with an electrical
conductivity of 1.0 dS m
–1
is added to a soil which has essentially no salt
present. FIGURE
shows data for solution with high electrical conductivity.
FIGURE 8-2. Waveforms collected in a sandy loam using CS610 probe
with RG8 connecting cable. Volumetric water content values are
0.10, 0.16, 0.18, 0.21, and 0.25. Solution electrical conductivity is
1.0 dS m
–1
.
FIGURE 8-3. Waveforms collected in a sandy loam using CS610 probe
with RG8 connecting cable. Volumetric water content values are
0.10, 0.18, 0.26, 0.30, and 0.37. Solution electrical conductivity is
10.2 dS m
–1
.
water content = 18%
water content = 37%
water content = 0.095
water content = 0.25
