Ray trace modeling of multipath in ultrasound power measurement system
Keywords:Acoustic variables measurement, Speed control, Ultrasonics, Multipath, Reflecting surfaces, Ultrasound sources
AbstractA ray tracing ultrasound model that calculates the ultrasound pressure at some point in a water tank remote from an ultrasound source is described. The method parallels the process of geometric optics and assumes constant ultrasound speed in water. The discussion of an experiment results shows the validation of the ray trace modeling method, and an algorithm is also presented that finds the optimal measurement settings for an existing ultrasound power measurement system to minimize the effect of multipath. The formation of multiple images of an ultrasound source due to the reflecting surfaces can further simplify the calculation. A tone-burst signal was fed to the transducer so that the direct waves and reflections can be distinguished by their different arrival times at the hydrophone. Experimental data showed that the measured beam shapes are within ?5 mm of those calculated by the ray trace model.
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