Magnetic particle inspection

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Notion

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Science and technology

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What Wikipedia says

Magnetic particle inspection (MPI) is a nondestructive testing process where a magnetic field is used for detecting surface, and shallow subsurface, discontinuities in ferromagnetic materials. Examples of ferromagnetic materials include iron, nickel, cobalt, and some of their alloys.

Excerpt from the Wikipedia article “Magnetic particle inspection”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Skleeba, CC BY-SA 4.0, via Wikimedia Commons.