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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 , [ 1 ] tennis serves , and ...
Radar speed guns use a microwave signal that is directed at a vehicle; the Doppler effect is used to derive its speed. LIDAR speed guns utilize the time of flight of laser pulses to make a series of timestamped measurements of a vehicle's distance from the laser; the data is then used to calculate the vehicle's speed. [20]
An early radar detector Car radar detector (Japanese) A radar detector is an electronic device used by motorists to detect if their speed is being monitored by police or law enforcement using a radar gun. Most radar detectors are used so the driver can reduce the car's speed before being ticketed for speeding.
Pocket Radar utilizes very similar microwave signal emission and detection methods found in the Doppler speed radar guns used by law enforcement agencies. The device measures 4.7 by 2.3 inches (119 by 58 mm) and weighs 4.5 ounces (130 g) when equipped with two AAA batteries. It operates at the 24.125 GHz K-Band frequency and can measure speeds ...
Jeremy Dunn (Laser Technology Inc.) developed a police lidar device in 1989, [3] and in 2004 10% of U.S. sales of traffic enforcement devices were lidar rising to 30% in 2006, [1] given the advantages of lidar it appears likely that the majority of current sales are lidar, although sophisticated radar units are still being sold.
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The radar speed gun was invented by Bryce K. Brown of Decatur Electronics in March 1954,[2] and was first used in Chicago, Illinois in April 1954.[citation needed] Patrolman Leonard Baldy was the first officer to issue a speeding ticket using the new device.
To test these radar detectors, I rented a radar gun and went to a deserted community-college campus in Southern California on a weekend. My assistant pointed a K-band radar gun at my test car, a ...