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Published online 27 February 2006
Published in Soil Sci Soc Am J 70:533-536 (2006)
DOI: 10.2136/sssaj2005.0209N
© 2006 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Small-Scale Matric Potential Sensor Based on Time Domain Reflectometry

Magnus Perssona,*, Jon M. Wraithb and Torleif Dahlinc

a Dep. of Water Resources Engineering, Lund Univ., Box 118, SE-221 00 Lund, Sweden
b Land Resources and Environmental Sciences Dep., Montana State Univ., P.O. Box 173120, Bozeman, MT 59717-3120, USA
c Engineering Geology, Lund Univ., Box 118, SE-221 00 Lund, Sweden


Figure 1
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  		Fig. 1. Schematic design of the gypsum time domain reflectometry matric potential sensor; all measurements are in millimeters.

 

Figure 2
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  		Fig. 2. Measured effective dielectric constant Keff for the four coiled probes before adding gypsum, versus the reference dielectric constants of the surrounding media measured in five different fluids and air.

 

Figure 3
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  		Fig. 3. Typical TDR traces of the gypsum TDR probes. The two traces are from measurements in air dry (solid line) and water saturated (dotted line) gypsum using probe GP1.

 

Figure 4
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  		Fig. 4. Measured dielectric constant of three gypsum probes (GP1–GP3) plotted vs. soil matric potential {psi}. The solid line is the modeled relationship using Eq. [2] with parameters calibrated using the GP1 measurements (Table 2).

 




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