Radar speed gun
Measuring device
Radar speed gun
A radar speed gun, also known as a radar gun, speed gun, or speed trap gun, is a device used to measure the speed of moving objects. It is commonly used by police to check the speed of moving vehicles while conducting traffic enforcement, and in professional sports to measure speeds such as those of baseball pitches, tennis serves, and cricket bowls. A radar speed gun is a Doppler radar unit that may be handheld, vehicle-mounted, or static. It measures the speed of the objects at which it is pointed by detecting a change in frequency of the returned radar signal caused by the Doppler effect, whereby the frequency of the returned signal is increased in proportion to the object's speed of approach if the object is approaching, and lowered if the object is receding. Such devices are frequently used for speed limit enforcement, alongside more modern LIDAR speed gun instruments, which use pulsed laser light instead of radar. While radar speed guns may be used while stationary, LIDAR speed guns...
Read on Wikipedia · Image Dennis van Zuijlekom from Ermelo, The Netherlands, CC BY-SA 2.0
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