Ahmed Chitnalah

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The aim of this paper is to study the modeling of the 3-D ultrasonic fields propagation using the angular spectrum approach (ASA). This approach is based on the two-dimensional spatial Fourier transform. It is well known that the numerical implementation of this method results in aliasing errors. Hence, the angular spectrum approach is modified to reduce or(More)
During its propagation in a given medium, the ultrasonic wave is disturbed by several phenomena that affect the waveform in both time and frequency domains. Among these phenomena, the most important are absorption, nonlinearity, and diffraction. The aim of this brief is to simulate in the SPICE-like simulator the diffraction losses in a pulse-echo(More)
The ultrasonic wave propagation is affected by absorption and diffraction. The transmission line is used to simulate the propagation media in PSpice model. To take into account diffraction effects we used the model proposed by J. Johansson [11]. A set of Gaussian beam is used to simulate the radiated field allowing us to deduce the exact diffraction loss.(More)
Nonlinearity is one of the phenomena that affect the ultrasonic wave during its propagation in a given medium. In the time domain the nonlinearity is seen as a variation of the phase velocity which leads to a distortion of the wave form that corresponds in the frequency domain to energy transfer from the fundamental frequency to the harmonic and among the(More)
We present a procedure for measurement of the non linear B/A parameter using a simple comparative method. A theoretical model of the measurement system is proposed. A function sensitivity of the system is derived in order to connect the electric and acoustic magnitudes. Thus the optimal conditions in order to avoid complex calculation of the transducers(More)
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