A novel fiber Bragg grating (FBG)-based weigh-in-motion (WIM) system is introduced in order to achieve a better performance compared with the existing WIM systems. This novel WIM system uses the fiber-reinforced composite (FRC) as the load-supporting material in combination with the FBG technology. The sensor is designed as a multiply FRC laminate with the FBG embedded inside it. A theoretical model is developed to analyze the mechanism of this WIM system. Both static and dynamic tests are conducted to verify the system performance. With the extraordinary mechanical properties of the FRC, this novel WIM system has achieved larger dynamic range and higher sensitivity than prior works. The simple design of the system also reduces the engineering difficulties and overall costs.
The modeling of through-wall sensing using ultra-wideband (UWB) signals is considered. The combined method of ray tracing and diffraction (CMRTD) is employed to analyze the interaction between the UWB signal and the target. The result is obtained in frequency
domain, and then transformed into time domain by use of inverse Fourier transform (IFT). Scattering from a two-dimensional (2D) perfectly conducting circular cylinder is calculated and the result is shown in agreement with that obtained from the eigenfunction
expansion method. Furthermore, the attenuating effects of walls are
considered based on the geometrical optics. Numerical results of scattering from a 2D perfectly conducting circular cylinder behind a
homogeneous, single-layered wall are given in both graphical and tabular formats.
This study investigates the modeling of through-wall sensing using
ultra-wideband (UWB) signals. The combined method of ray tracing and
diffraction (CMRTD) is employed to model and study the interaction
between the UWB signal and the target. The result is obtained in
frequency domain, and then transformed into time domain by use of
inverse Fourier transform. Numerical results of scattering from a
two-dimensional (2D) perfectly conducting circular cylinder are
obtained and compared with those from the eigenfunction expansion
method. Good agreements between the results are achieved. In
addition, the attenuating effects of walls are considered and
numerical result of scattering from a 2D perfectly conducting
circular cylinder behind a homogeneous, single-layered dry wall is
presented. The model can be easily extended to handle the dielectric
target and the multiple-layered walls.
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