I am trying to build an ultrasound thickness measurement device using either Arduino or raspberry pi (haven't decided on which yet), before i start i have a doubt and am hoping someone can clarify the doubt

Will ultrasound travel from a medium with higher speed to a medium with lower speed or is just one way i.e from lower speed to higher speed.

The place i am trying to implement this ultrasound machine is having layers where the speed of ultrasound will be faster on the outermost layer and then it will gradually decrease. can i use a ultrasound thickness measurement device to find the thickness of all the layers present?

  • $\begingroup$ As a hint, if you look at an ultrasound picture of a baby, if you can see a line where the ultrasound went into bone, out of bone, and you can see things on the other side, that is proof that it can traverse in both directions. It may, however, be worth noting that ultrasound picks up impedance mismatches. Gradual changes are much harder. $\endgroup$ – Cort Ammon Feb 21 '17 at 1:41

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