Time domain reflectometry of glass beads/magnetite mixtures: A time and frequency domain study

Mattei, Elisabetta; De Santis, Alberto; Di Matteo, Andrea; Pettinelli, Elena; Vannaroni, Giuliano
May 2005
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p224102
Academic Journal
The measurements of the time domain reflectometry (TDR) signal propagating along a coaxial probe, filled with dry mixtures of glass beads and magnetite, are analyzed for deriving the attenuation factor α and the bandwidth. Samples with different percentages (5%–25%) of magnetite are considered. The α values are obtained by two different methods: (i) wave amplitude at the second reflection, (ii) electromagnetic parameters and widths of the passing bands. The two methods provide consistent α values within the experimental uncertainties. The agreement supports the possibility of measuring the attenuation factor from the second TDR reflection, for anhydrous samples similar to the investigated mixtures.


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