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Time domain reflectometry of glass beads/magnetite mixtures: A time and frequency domain study
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Image of FIG. 1.
FIG. 1.

Measured TDR traces (arbitrary units of the voltage output) for different percentage of magnetite. The traces were displayed from the start to the end of the probe. The vertical arrows indicate the voltages , , and used to calculate the attenuation factor. The inset shows the functions for the same percentages of magnetite (same symbols of the main figure). The first reflections occur at about 9 ns and the second ones in the range 12–14 ns.

Image of FIG. 2.
FIG. 2.

Measured (open circles) and fitted (solid line) (arbitrary units of the TDR voltage output) for the mixture with 5% of magnetite. Dotted and dashed lines represent Gaussian-like and exponential components, respectively. The inset shows normalized power spectra of the functions shown in the inset of Fig. 1.

Image of FIG. 3.
FIG. 3.

(a) vs the magnetite percentage. The uncertainties on the values are of only few percents, and are not displayed. (b) comparison between the attenuation factor (◇) from Eq. (4) and [▴ (Ref. 7)] from Eq. (3). The values have uncertainties of the same order of magnitude than . The error bars are not quoted for sake of clarity.


Generic image for table
Table I.

Parameters values obtained by fitting the function [Eq. (2)].


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time domain reflectometry of glass beads/magnetite mixtures: A time and frequency domain study