The sample areas of conventional and alternative time domain reflectometry probes

The sample areas of conventional and alternative time domain reflectometry probes We define the sample area in the plane perpendicular to the long axis of conventional and alternative time domain reflectometry (TDR) probes based on the finite element numerical analysis of Knight et al. (1997) and the definition of spatial sensitivity ofKnight (1992). The sample area of conventional two‐ and three‐rod probes is controlled by the rod separation. Two‐rod probes have a much larger sample area than three‐rod designs. Low dielectric permittivity coatings on TDR rods greatly decrease the sample area. The sample area of coated rod probes decreases as the relative dielectric permittivity of the surrounding medium increases. Two alternative profiling probes were analyzed. The separation of the metal rods of Hook et al. (1992) probes controls the size of the sample area. Reducing the height or width of the rods improves the distribution of sensitivity within the sample area. The relative dielectric permittivity of the probe body does not affect the sample size. The sample size of the Redman and DeRyck (1994) probe is also controlled by the rod separation. Two alternative surface probe designs (White and Zegelin, 1992; Selker et al., 1993) are shown to have similar sample areas. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Water Resources Research Wiley

The sample areas of conventional and alternative time domain reflectometry probes

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Publisher
Wiley
Copyright
Copyright © 1998 by the American Geophysical Union.
ISSN
0043-1397
eISSN
1944-7973
D.O.I.
10.1029/98WR02093
Publisher site
See Article on Publisher Site

Abstract

We define the sample area in the plane perpendicular to the long axis of conventional and alternative time domain reflectometry (TDR) probes based on the finite element numerical analysis of Knight et al. (1997) and the definition of spatial sensitivity ofKnight (1992). The sample area of conventional two‐ and three‐rod probes is controlled by the rod separation. Two‐rod probes have a much larger sample area than three‐rod designs. Low dielectric permittivity coatings on TDR rods greatly decrease the sample area. The sample area of coated rod probes decreases as the relative dielectric permittivity of the surrounding medium increases. Two alternative profiling probes were analyzed. The separation of the metal rods of Hook et al. (1992) probes controls the size of the sample area. Reducing the height or width of the rods improves the distribution of sensitivity within the sample area. The relative dielectric permittivity of the probe body does not affect the sample size. The sample size of the Redman and DeRyck (1994) probe is also controlled by the rod separation. Two alternative surface probe designs (White and Zegelin, 1992; Selker et al., 1993) are shown to have similar sample areas.

Journal

Water Resources ResearchWiley

Published: Nov 1, 1998

References

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