The term “Time Domain Transmissometry” (TDT) describes the measurement methods used to characterize the quality of signal transmission. In Time Domain Transmissometry, the time required for an electromagnetic wave to propagate along a given length of the transmission line is measured. TDT measures the propagation time of an electrical pulse from the beginning to the end of the loop. Similar to TDR, a pulse measured using TDT will travel slower in wetter terrains compared to drier ones. The pulse velocity is correlated with the dielectric constant.
