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physics behind police radars

physics behind police radars - Shift occurs The radar gun...

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Boris Demonjic The Physics behind…. Police Radars Although we may not like police radars and the money they can take away from us, the physics behind how they work is interesting. A police radar is used to send out radio waves of specific frequencies in a chosen direction. The traveling waves then bounce off objects (like cars) , and return to the radar gun. When the waves reflect off a moving vehicle, a measurable frequency shift, called Doppler
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Unformatted text preview: Shift, occurs. The radar gun computer then uses the frequency shift to calculate the speed of the moving vehicle. If the speed returned is higher than the speed limit, you of course receive a big fat ticket, and a “have a nice day!” Source: http://www.pbelectronics.com/police_radar.htm on May 21, 2007....
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