Ultrasonic Distance Meter

Ultrasonic Distance Meter

A sonic ranger is a device that determines the distance to an object by sending out an ultrasonic....?

A sonic ranger is a device that determines the distance to an object by sending out an ultrasonic sound pulse and measuring how long it takes for the wave to return after it reflects from the object. Typically these devices cannot reliably detect an object that is less than half a meter from the sensor. Why is that?

If something is half a meter away, the time to bounce off it and back to the sensor is the time for sound to travel 1 meter. At 340 m/sec, that is 0.00294 sec, or about 3 msec. So the time resolution is not much better than about 3 msec. Perhaps that is comparable to the width of the pulse.

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