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The Doppler Effect Easily experienced when standing by an expressway or railroad track.Still image:
Size: 3742 x 2477
Acquisition: Graphic, Scanned illustration
Frame rate: still
Clearance: No releases required
Location: Graphic
License: Royalty Free
Usage: Creative and Editorial
Point of view: Other
Geography: N/A
Ambiance: N/A
Time shot: N/A

Season shot: N/A

Still images available: Y
Keywords:   Radars, Weather Explanations, Tornado, Weather Radar
Asset ID: 5402
Title: The Doppler Effect
Concept: Easily experienced when standing by an expressway or railroad track.
Detail: The Doppler effect is a very general principle of physics applied to modern radars. As with conventional radar, radiation is scattered back toward the receiver from a target, but another principle is exploited. If the particular target is moving either toward or away from the antenna, there will be a slight shift in the radiation frequency that is scattered backwards. It is possible, by monitoring the shift in frequency of the microwave radiation, to tell whether the target is moving toward or away from the antenna, and at what speed. A graphic example of the Doppler effect is the familiar change in pitch of the sound waves that one hears when a train whizzes past while blowing its whistle. There is a distinct change in the pitch depending on whether the train is moving toward, or away from you. However, converting the Doppler shift information to meaningful meteorological data is an extraordinarily complex task requiring a great deal of computer power. The new NEXRAD radars deployed since the 1990s have massive computer power.

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