A new inspection system for railway wheels using the Doppler Effect is presented in this work. The proposed system analyses the rail-wheel contact by frequency and phase shifts. Cracks on the wheel tread are determined while the train moves at a low speed. A special rail is used to propagate monochromatic surface waves. When a wheel on the measuring rail moves at constant speed, the received signal will present a regular frequency shift related with the movement speed. The difference between the emitted and the received frequencies will change if any defect on the wheel tread is detected

This work analyses the use of parallel processing techniques in synthetic aperture ultrasonic imaging applications. In particular, the Total Focussing Method, which is a O(N ² x P) problem, is studied. This work presents different parallelization strategies for multicore CPU and GPU architectures. The parallelization processes on both platforms are discussed and optimized in order to achieve real-time performance.