HELP NEEDED!! Ultrasonic thickness sensor

Projects General Guidance
1

I am working on my final year project in which I will be building an underwater drone to inspect the hull of a ship. I was hoping to accommodate an ultrasonic thickness sensor to report the thickness reading of hull. So for that I have a couple of silly questions.

  1. Does the water medium [30-40m deep] affect the readings taken by the normal ultrasonic thickness gauge which are usually used in air?

  2. If not, I have narrowed down a few ultrasonic thickness transducers which are under my budget [as against some special gauge equipment made by Cygnus]. But I am not sure how the transducers will be interfaced with Arduino, or how difficult signal processing is going to be.

I really appreciate any form of guidance. Thank you in advance.

2

The water depth won't matter much. Except your electronics has to be packaged such that high pressure salt water won't ingress.

Not easy.

You need to energise such a ( probably piezo ) transducer with a pulsed signal of many MHz, and interpret small echoes coming back to uS accuracy.

Not easy.

A lot of carefully designed hardware is required.

The arduino bit , whatever you want it to do, is trivial by comparison.

Allan

3

Duplicate topic deleted.

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