Ultrasound thickness measuring.

Discussion in 'Metal Boat Building' started by gcav, Mar 6, 2018.

  1. gcav
    Joined: Mar 2018
    Posts: 1
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    Location: Oakvill,on

    gcav New Member

    I know that best measurement would be againstt bare metal.
    How much distortion is added if measuring over paint?

  2. gonzo
    Joined: Aug 2002
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    Location: Milwaukee, WI

    gonzo Senior Member

    It will depend on the ratio of paint thickness to base material thickness. The ultrasonic measuring devices use a value called "celerity" which is characteristic of each material. The paint has a different value than the base material. You could adjust the measurement by averaging the celerity values. A problem with measuring layered materials, is that there will be secondary, out of phase echoes.
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