Most of you may heard about sensors particularly Radar, Lidar and camera. Is camera a sensors ? Yes !! Camera can be use as a sensors. Camera actually widely use on self driving car to detect an object. Camera able to identify traffic signal, driving lane and so on.
Radar or radio detection and ranging is using radio signal. It’s bounce on hard surfaces but at lowest resolution. Radar is use Doppler effect by measuring changes of radar wave and compare between two reading to measure speed.
Lidar or light detection and ranging is using infrared laser beam (wave-length around 900 nano meter). Lidar measurement is work by measure reflection return by object. Lidar in other hand is more focus than others sensor above. Lidar sensor must be maintain on clean condition to operate better.