Do ultrasonic sensors send out waves in a straight line, all the way to a reflecting substance (if any) and get reflected in the same line back to the receiver?
Or do they send out a wave which gradually becomes wider?
If the answer is case (ii), could someone please tell me how they work?
This is for a project I am doing about using an ultrasonic/IR/laser proximity sensor.
Do any of the available distance sensors send waves in straight lines, to the reflecting substance and back?
Thanks a bunch.