Environmental Engineering Reference
In-Depth Information
Fig. 3.11 Various probe designs (parallel plate and multi-wire configurations), typically used
for TDR-based soil moisture. Electrical field lines generated for different probe configura-
tions are also shown: closer line spacing is associated with a more concentrated field (i.e.,
greater influence on permittivity) [30]
Fig. 3.12 Three-rod
TDR probe (0.15 m-
long; 3.20 mm-diam. rods;
12.0 mm rod spacing), and
two-rod probe (Campbell
Scientific CS616) [13]
impedances are connected at the section where the sensing portion of the probe
begins. Fig. 3.14 clarifies this aspect; however, the importance of calibration will be
discussed in detail in the following chapters.
 
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