Have you ever wondered about the instruments that the police use to measure vehicle speeds on our highways? My favourite tool was LIDAR because it gave me the ability to accurately measure the speeds of individual vehicles. Although the laser must be used from a stationary position, either hand held or on a tripod, being able to target a specific vehicle made it superior to RADAR on a busy highway.
How Does a Laser Device Measure Vehicle Speed?
When I pulled the trigger on the laser, it sent a train of infrared laser pulses toward the vehicle I had aimed it at. These pulses reflected off of the vehicle back to the laser device. It had to see 80% of these pulses returned in recognizable form or it would refuse to display a reading.