radar-the world communicates
Current Technology and Advances MadeRadar first began in 1930 when two American scientists realised its military value. Its first major application was in 1940 when the British had developed radar to such a degree that they were very successful in detecting and shooting down many enemy aircraft during WWII. Since then Radar has made a lot of advances and has spread into many different fields such as tracking aeroplane traffic, mapping, weather forecasting and one of its very important uses in police radar and speed cameras.In the late 1950's the police introduced the first technologies to kerb the ever-increasing fatality rate on the N.S.W roads. They introduced the first speed detection device called the Pie Radar (Radio Detection and Ranging) which had an antenna about the size of a 20-litre drum, because of its size and the power required to run it, it had to be carried around in the back of a Ute which had to be kept running to power the radar. These original radars were not really a solution to the problem as they were not practical or accurate. In 1968 a new radar called the S5 was put to the test and showed to be more salubrious than previous models as it was smaller and much easier to use bu
The other modern day speed camera is the Traffixpak Speedshot, which can tell the difference between different vehicles travelling in the same direction as well as calculating the speed of vehicles travelling in both directions this system can also be modified to digital imaging in the future. If the speed is above the set speed it will then trigger the camera, which will take a photo of you and your number plate. One large issue is whether speed cameras are always placed in fair positions and not in places such as the bottom of large hills where sometimes it is difficult to stay exactly under the speed limit, the argument here is whether the police are trying to save lives are if they are just revenue raising. The Lidar can then determine how far away the car is by multiplying the time by the speed of light. They are being situated in black spot locations where there is a history of speeding offences, and serious and often fatal injuries. When the radar and the car the wave hits are both stationary the reflected wave will have the exact same frequency, but if the car is moving each part of the wave will be reflected at a different point which will change the returning waves wavelength. The newest radar instrument, which was introduced in 1997, is called a Lidar (Light Detection and Ranging), which uses light instead of radio. t in 1971 the S5 radar lost a challenge in court and it was proved that the manufacturer couldn't verify their own radar, this was the end of the S5. Ethical Issues and Consequences For SocietyThere are many ethical issues involved with police speed cameras and radars. Applications of the PhysicsThe Police and the RTA have applied the physics of radar to help enure our roads are safer by the development of speed cameras and radars. Wave Motions UsedPolice radars use electromagnetic (radio waves). The Lidar works by shooting out hundreds of bursts of infrared light in a fraction of a second, it times how long it takes for each beam to hit the car and return back to the gun. The one that is quiet often used is the K band radar which operates on a wavelength of 1. The new type of speed detection gun is called Lidar (Light Detection and Ranging).
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