Date of Birth: 11/29/1803
Place of Birth: Salzburg
Christian Doppler Research interests lie in the areas of physics as optics and acoustics. Major works performed by the aberration of light, the theory of the microscope and an optical rangefinder, color theory and some other topics. In 1842 Doppler theorized dependence of the oscillation frequency, perceived by an observer, on the speed and direction of motion of the wave source and the observer relative to each other. This phenomenon was later named after him (the Doppler effect). The main reason for the Doppler effect - change in the number of waves that fit on the propagation path between source and receiver.
While maintaining the wavelengths emitted by the source, this leads to a change in the number of waves arriving at the receiver every second, i.e. to change the frequency of the received oscillations.
In 1848, the Doppler effect has been clarified by the French physicist Armand Fizeau, and in 1990 - and experimentally verified AA Belopol`skii in a laboratory setting. The principle of Doppler received numerous applications in astronomy for measuring velocities of stars along the line of sight, and their rotation around the axis of turbulent flows in the solar photosphere, and so on., And then in the most diverse fields of physics and engineering (up to the radars used by the traffic police).
Christian Doppler Died March 17, 1853 in Venice.