Identification of Acoustic Wave Orientation for Ultrasound-Based Flow Measurement by Exploiting the Hough Transform

P. Ploß, S.J. Rupitsch, T. Fröhlich, R. Lerch
2012 Procedia Engineering  
Ultrasound-based flow measurement relies on the proper knowledge of the angle under which the acoustic waves propagate with respect to the flow direction of the streaming fluid. We present a novel image processing approach for the identification of the wavefronts' orientation by exploiting a modified Hough transform. The spatially discretized sound pressure amplitude of measurement/simulation data is utilized as a weighting function for the Hough transform. It is shown that the angle and
more » ... n of a wavefront can be estimated with subpixel accuracy, where the size of a pixel depends on the data's spatial resolution. This is achieved by incorporating a least-squares algorithm, fitting a 2D Gaussian function to the Hough parameter plane and thus improving the accuracy of the detected wavefront properties.
doi:10.1016/j.proeng.2012.09.122 fatcat:q67a5k7t65ed5gt3a7on76fnki