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Temperature-Dependent Scaled Frequency: Improved Accuracy of Multisensor Capacitance Probes

^a Natural Resources & Environmental Management Dep., Univ. of Hawaii-Manoa, 1910 East West Rd., Honolulu, HI 96822
^b Molecular Bioscience and Bioengineering Dep., Univ. of Hawaii at Manoa, 1955 East West Rd., Honolulu, HI 96822

View larger version (29K): [in this window] [in a new window]   Fig. 1. Schematic of the experimental setup. The multisensor capacitance probe (MCP) is inserted in the soil column, which is placed in the water bath.

View larger version (43K): [in this window] [in a new window]   Fig. 2. Capacitance sensor scaled frequencies (SF) in deionized water treatment at varying temperatures of heating and cooling.

View larger version (21K): [in this window] [in a new window]   Fig. 3. Capacitance sensor scaled frequencies (SF) in air treatment at varying temperatures of heating and cooling.

View larger version (24K): [in this window] [in a new window]   Fig. 4. Hysteretic effect of the multisensor capacitance probe (MCP) output in the quartz sand treatment under heating and cooling cycles for a range of temperatures between 5 and 45°C.

View larger version (42K): [in this window] [in a new window]   Fig. 5. Capacitance sensor output in (A) unsaturated and (B) saturated quartz sand based on the manufacturer's default calibration within the temperature range from 5 to 45°C.

View larger version (24K): [in this window] [in a new window]   Fig. 6. The apparent water contents before and after adjustment using temperature-dependent scaled frequency calibration of multisensor capacitance probes in quartz sand at (A) 5 and (B) 45°C.

View larger version (27K): [in this window] [in a new window]   Fig. 7. Regression correlations describing the relationship between the values of the fitted calibration parameters for the multisensor capacitance probes and quartz sand temperature for the range of 5 to 45°C. The calibration equation is in the following form: water content = A + B(scaled frequency)C.

View larger version (26K): [in this window] [in a new window]   Fig. 8. Capacitance sensor output at (A) unsaturated and (B) saturated quartz sand after the temperature-dependant scaled frequency calibration was applied within the temperature range from 5 to 45°C.