The Doppler effect is a phenomenon in which the frequency of a wave changes relative to an observer who is moving in relation to the wave source. It is named after Austrian physicist Christian Doppler, who first described it.
Doppler radar is a type of weather radar that uses the Doppler effect to measure the velocity of objects, such as raindrops, in relation to the radar.
Doppler ultrasound is a noninvasive test that uses sound waves to measure the blood flow through blood vessels.
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The Doppler effect or Doppler shift (or simply Doppler , when in context) is the apparent change in frequency of a wave in relation to an observer who is moving relative to the wave source. It is named after the Austrian physicist Christian Doppler , who described the phenomenon
Doppler effect - Wikipedia
NEXRAD (Next Generation Radar) is a weather radar that obtains weather information based on returned energy, which is reflected back toward the radar. The Doppler effect was named after the Austrian physicist, Christian Doppler, who discovered it. The radar's computers measure the phase change of the reflected pulse of energy which then convert that change to a velocity of the object, either toward or from the radar.
Using and Understanding Doppler Radar
A Doppler radar is a specialized radar that uses the Doppler effect to produce velocity data about objects at a distance. It does this by bouncing a microwave signal off a desired target and analyzing how the object's motion has altered the frequency of the returned signal. This variation gives direct and highly accurate measurements of the radial component of a target's velocity relative to the radar.
Doppler radar - Wikipedia
A Doppler ultrasound is a noninvasive test that can be used to estimate the blood flow through your blood vessels by bouncing high-frequency sound waves (ultrasound) off circulating red blood cells. A regular ultrasound uses sound waves to produce images, but can't show blood flow.
Doppler ultrasound: What is it used for? - Mayo Clinic
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A Doppler ultrasound is an imaging test that uses sound waves to show blood moving through blood vessels. The test shows the speed and direction of blood flow ...
Doppler Ultrasound: MedlinePlus Medical Test
Dopplers (also called shifters, mimics, doubles, imitators, or pavrats) are shapeshifters who can take the form of anyone or any beast they have encountered, ...
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A Doppler fetal monitor is a hand-held ultrasound transducer used to detect the fetal heartbeat for prenatal care. It uses the Doppler effect to provide an audible simulation of the heart beat. Some models also display the heart rate in beats per minute (BPM). Use of this monitor is sometimes known as Doppler auscultation. The Doppler fetal monitor is commonly referred to simply as a Doppler or fetal Doppler. It may be classified as a form of Doppler ultrasonography (although usually not technically -graphy but rather sound-generating).
Doppler fetal monitor - Wikipedia