Doppler is used in an ultrasound exam to look for and analyze movement, usually in evaluating venous or arterial blod flow.
Doppler echocardiography Doppler echocardiography Doppler echocardiography Doppler echocardiography
You may be referring to the Doppler effect. I suggest to look up "Doppler Effect" in the Wikipedia; but briefly, waves get "compressed" in the forward direction, and "elongated" in the opposite direction.
Doppler effect and Doppler radar are the two most common compound nouns for the proper adjective Doppler.
He discoverd the Doppler effect
Christian Doppler
The Doppler effect describes how the frequency of a wave changes depending on the relative motion between the source of the wave and the observer. For sound waves, this effect causes a change in pitch as the source moves towards or away from the observer. For light waves, the Doppler effect causes a shift in color towards the blue end of the spectrum as objects move towards an observer and towards the red end as they move away.
doppler in poptropica
The Doppler effect was discovered by Austrian physicist Christian Doppler in 1842. He observed that the frequency of sound waves changes when the source of the sound is in motion relative to the observer.
the Doppler effect involves moving objectsthe Doppler effect involves moving objects
The Doppler Effect was named after Austrian physicist Christian Doppler, who first described it in 1842.
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