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Published online 27 February 2006
Published in Soil Sci Soc Am J 70:537-540 (2006)
DOI: 10.2136/sssaj2005.0176N
© 2006 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Right arrow Time Domain Reflectometry, TDR

Experimental Limitations of Time Domain Reflectometry Hardware for Dispersive Soils

S. D. Logsdon*

National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011


Figure 1
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  		Fig. 1. Layout of the four attachment levels. The RG58A cable between the cable tester and transient suppressor is 0.9 m and between the transient suppressor and multiplexer one is 1.8 m. The RG8 low loss cable between multiplexers one and two is 15 m. The probe consists of 3.7-m RG58A cable, head containing 1:1 balun, and 0.3-m waveguides.

 

Figure 2
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  		Fig. 2. Effect of attachments on TDR waveform, shown for one replicate, water content of 0.352 m3 m–3 and 15°C. Level 1 is the probe (and associated cable and head) attached to the cable tester front panel, Level 2 adds a cable and transient suppressor, Level 3 adds a cable and multiplexer, and Level 4 adds a low loss cable and second multiplexer. The waveform times were adjusted so that all levels appeared in the same frame. Points pre-a, b, c, and post-d indicate the areas chosen to compare reflection coefficient differences.

 




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