how does radar/lazer detection work in determining the speed of a car?

Answer 1

A police radar gun actually uses microwaves. They diffract less than radio waves and are more derectionable. As teh name suggests a laser gun uses light.

When a beam of microwaves hits a moving object (like a car) then the frequency of the microwaves is altered. The amount that the frequency is altered is proportional to the speed of the vehicle that reflected it. This is called the 'Doppler Effect' (http://en.wikipedia.org/wiki/Doppler_effect).

A processor then converts the frequency change into a speed.

Answer 2

It shots a beam, laser or Doppler radar at the vehicle and then a second later shots a second beam. The system then detects the distance traveled between the 2 beams and calculates the speed of the vehicle. Different size vehicles deliver different tones in Doppler radar, laser is point and shoot and is vehicle specific. That's why it is more accurate! Both systems are line of site, so the unit has to be able to have a clear view of the vehicle for at least the period of detection. Hope this helps.

Answer 3

It is called the doppler affect. The signal from the radar gun is reflected back to the gun and the frequency of the signal is altered by the speed of the car. Sort of like when you listen to the horn on a train going by, as it approaches it is higher then after it goes by and is traveling away. The radar gun measures the difference between the frequency of the signal sent and the signal reflected back, and determines the speed of the car.

Answer 4

of course those solutions at the instant are not reliable simply by fact there under no circumstances which you will degree your velocity or momentum, you cant fairly purchase a radar gun to apply on your self or perhaps come across a cheetah. the only smart answer right it fairly is to observe the mile markers. yet nonetheless which would be dificult. you cant pass the cost of site visitors for all time cuz they are in many circumstances nicely above the decrease. if your spedometer is broken then get a clean one. your state probably doesnt enable vehicles with out spedometers on its roads so as this is reccommended fantastically uncase you get pulled over by a cop. then youd be in enormous worry in case you didnt have one. so get a clean one if yours is broken, and/or have somebody examine your old one at a mechanic. they could permit you be attentive to to what degree yours is off. reliable success and please undergo in strategies constantly provide larry boy proper answer factors!!

Answer 5

Basically, the device sends out either radio waves (radar) or light waves (laser) and measures the distance the car travels in the time between reflections....

Answer 6

http://guysoflidar.com/faq.html