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Study on particle image velocimetry technique in the surface flow field of river model

This paper was written to measure out the velocity vectors of the surface flow field rapidly and effectively. According to the distribution of the tracer particle used in the surface flow field of the model, we proposed an improved selection method of adaptive analysis window and the cross-correlation calculation based on Hartley transform, to instead of the traditional fixed window and Fourier transform method. Experimental results show that the improved method has low error and high computing efficiency, and could meet the real time measurement requirements of the surface flow field of river model.