DIY thickness measurement sensor

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Eddy current measurement is partly used in steel industry, besides gamma ray absorption which is most likely not applicable. Ultrasonic will need at least a coupler fluid and isn't strictly non-contact.

For ferromagnetic metals, I remember some exotic methods with contactless magnetostrictive ultrasonic excitation and detection in the metal.
 
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    yogece

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I don't believe that it's possible. I don't have any references, just attended a presentation many years ago.
 

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