Originally Posted by
tomato coupe
Yes, that's what they're designed to do. But, the OP is interested in distance -- that's not what speed sensors are designed to do.
??? They are clearly designed for distance too. That's their primary (historical) purpose.
They started out to measure distance (they couldn't do speed at all).
They aren't "speed" sensors anyway. They are "rotation" sensors. The speed and distance have to be provided by the head unit (there are a few that do this calculation in the sensor but that's a recent thing).