Abstract
Time domain transmissiometry (TDT), a method of measuring transmitted broadband signal in microwave frequency, has been drawing a lot of attention more than ever as an alternative method to monitor water content and solute concentration in soils. To establish the monitoring method by applying TDT, we measured travel time and amplitude of impulse-signal transmitted through several types of fluid media using TDT probes with different lengths, and verified the effectiveness of TDT for the estimation of apparent permittivity and electrical conductivity of the media. Although the determination of apparent permittivity and electrical conductivity of an extremely high-conductive medium was not completed due to the inadmissible loss of the transmitted signal, we successfully determined both properties by TDT in moderate-conductive media. Judging from their distribution from referential values in literature, we concluded that the longer probes provided more accurate estimations of apparent permittivity and electrical conductivity.
