Abstract
We designed a profiling time domain reflectometry (TDR) probe. The probe includes two short rods that measure through two parallel access tubes. Small diameter wires lead to the top of the measurement interval, limiting the sensitivity of the probe to the medium above the region of interest. Larger diameter target rods span the sample interval, leading to greater sensitivity of the probe to the medium surrounding the access tubes within the measurement interval. The probe sensitivity is further increased by sealing the access tubes and filling them with water. Six prototype probes built using readily available components showed a consistent sensitivity to the soil, receiving ≃25% of the total probe response from the medium around the access tubes in the sample interval. We tested three methods of field calibration of the probe. The calibrated profiling-probe responses produce water-content profiles comparable to those determined with a neutron probe during the advance of a wetting front.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 865-873 |
| Number of pages | 9 |
| Journal | Soil Science Society of America Journal |
| Volume | 62 |
| Issue number | 4 |
| State | Published - Jul 1998 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Soil Science
- Earth-Surface Processes
Cite this
Water content response of a profiling time domain reflectometry probe. / Ferre, Paul A; Rudolph, D. L.; Kachanoski, R. G.
In: Soil Science Society of America Journal, Vol. 62, No. 4, 07.1998, p. 865-873.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Water content response of a profiling time domain reflectometry probe
AU - Ferre, Paul A
AU - Rudolph, D. L.
AU - Kachanoski, R. G.
PY - 1998/7
Y1 - 1998/7
N2 - We designed a profiling time domain reflectometry (TDR) probe. The probe includes two short rods that measure through two parallel access tubes. Small diameter wires lead to the top of the measurement interval, limiting the sensitivity of the probe to the medium above the region of interest. Larger diameter target rods span the sample interval, leading to greater sensitivity of the probe to the medium surrounding the access tubes within the measurement interval. The probe sensitivity is further increased by sealing the access tubes and filling them with water. Six prototype probes built using readily available components showed a consistent sensitivity to the soil, receiving ≃25% of the total probe response from the medium around the access tubes in the sample interval. We tested three methods of field calibration of the probe. The calibrated profiling-probe responses produce water-content profiles comparable to those determined with a neutron probe during the advance of a wetting front.
AB - We designed a profiling time domain reflectometry (TDR) probe. The probe includes two short rods that measure through two parallel access tubes. Small diameter wires lead to the top of the measurement interval, limiting the sensitivity of the probe to the medium above the region of interest. Larger diameter target rods span the sample interval, leading to greater sensitivity of the probe to the medium surrounding the access tubes within the measurement interval. The probe sensitivity is further increased by sealing the access tubes and filling them with water. Six prototype probes built using readily available components showed a consistent sensitivity to the soil, receiving ≃25% of the total probe response from the medium around the access tubes in the sample interval. We tested three methods of field calibration of the probe. The calibrated profiling-probe responses produce water-content profiles comparable to those determined with a neutron probe during the advance of a wetting front.
UR - http://www.scopus.com/inward/record.url?scp=0032124477&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032124477&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0032124477
VL - 62
SP - 865
EP - 873
JO - Soil Science Society of America Journal
JF - Soil Science Society of America Journal
SN - 0361-5995
IS - 4
ER -