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1414 North Memorial Parkway Huntsville, AL 35801 (256) 533-4848 . Contact Us. Badanie USG. Because the Doppler effect depends on things moving, it can generally be used to determine the motion or speed of an object. Objects of interest may be the speed of a car on the highway, the motion of blood flowing through an artery, the rotation of a galaxy, even the expansion of the Universe..