UNTRANSLATED .. 6.4

Distance Measurement, by ultrasound echoΒΆ

Objective

Measure distance by measuring the time taken by 40~kHz pulse train to echo from a hard surface.

Procedure

_images/sr04-dist.svg
  • Keep a flat surface, like a cardboard sheet, around 10 cm from the echo module
  • Press START
  • Change the distance with time

Discussion

The distance is calculated from the time taken by a burst of sound to echo from the surface kept in front of the module. The distance can be measred as function of time, enabling to calculate velocity, acceleration etc.