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Effect of Cable Length on Time Domain Reflectometry Calibration for High Surface Area Soils

^a USDA-ARS, National Soil Tilth Laboratory, 2150 Pammel Dr., Ames, IA 50011 USA

View larger version (13K): [in a new window]   Fig. 1 Typical waveform used to determine apparent length (La) and 90% rise time

View larger version (13K): [in a new window]   Fig. 2 Diagram of the setup for cable tester, multiplexers, cables and accessories. Waveguide cables were attached to either the first level multiplexer or the second level multiplexer, but not both at the same time. The lengths of cables between the transient suppressor and the two multiplexers varied as described in Table 1

View larger version (21K): [in a new window]   Fig. 3 Water content as a function of the square root of apparent dielectric number for two temperatures, and four cable length combinations for Okoboji Sample A

View larger version (17K): [in a new window]   Fig. 4 Water content as a function of the square root of apparent dielectric number for two temperatures, and four cable length combinations for sand Sample D

View larger version (19K): [in a new window]   Fig. 5 Bulk DC electrical conductivity as a function of water content and temperature for the Okoboji and sand samples

View larger version (18K): [in a new window]   Fig. 6 Square root of the apparent dielectric number as a function of the frequency bandwidth for the two Okoboji and two sand samples each at two different water contents

View larger version (12K): [in a new window]   Fig. 7 Waveforms for Okoboji Sample A at the highest water content and three cable length combinations