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The geoacoustic (GA) parameters (sound speed $c$, density $\rho$, and attenuation $\alpha$) of the bottom play crucial roles in broadband acoustical propagation in shallow water. In general, these parameters and their profiles are very hard to measure directly, especially the bottom attenuation at low frequencies. A common way to get these parameters is inverting them from the acoustical field data...
High-precision permittivity measurements of liquids are essential for specifying the specific absorption rate (SAR) of radio frequency power into human tissue. At VSL, a commercial unit is used for these measurements, but for reaching a low uncertainly some inherent disadvantages need to be overcome. In this paper, a multi-step approach is proposed using a combination of curve fitting, nonlinear progressive...
A commercial two-channel high-speed digitizer is extensively characterized in the frequency range of 50 Hz to 1 MHz. The measurements involve flatness, linearity, phase, and the effects of loading, dc offsets, and temperature. The results indicate that the digitizer can be applied in wideband power measurements with an uncertainty better than 1% at 1 MHz.
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