Optical, things were daily photonic doppler velocimeter effect.Let's and superstition observation in daily life, often encounter waves and observer relatively medium and activity environment., for example, the train whistle tone, near observer time-varying high, low and away from the observer time-varying, such as waves or the activities of the observer relative dielectric, and the observer the received frequency is a sign of changes, is by the Austrian physicist doppler (Christian doppler) in 1842, the beginning of the doppler effect of invention.The doppler effect can be divided into two categories:The first category for the machine wave doppler effect.It includes the following several environment: (1) waves, the observer relative activities of medium;(2) waves, observers did not move;(3) waves and observer activities at the same time.The second category is the electromagnetic wave doppler effect.Now beginning to on acoustic doppler in 1842 after the invention of the doppler effect, 1930 begin to apply the discipline of electromagnetic wave, the doppler effect of the electromagnetic wave in 1938.
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