Speed Measurement by Optical Techniques
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چکیده
The most obvious optical method for measuring the speed of a moving object is to use the Doppler effect: light reflected from the moving object will be shifted in frequency on proportion to the line of sight velocity of the object. While we are familiar with examples in the radio domain (such as police traffic radar and Doppler weather radar) and with acoustic waves (the apparent change in pitch of a passing siren), demonstrating the Doppler effect optically is not so trivial a matter. The primary reasons for this are:
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