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Electromagnetic inspection tool for ferromagnetic casings

  • US 4,292,588 A
  • Filed: 12/18/1978
  • Issued: 09/29/1981
  • Est. Priority Date: 12/18/1978
  • Status: Expired due to Term
First Claim
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1. In an electromagnetic thickness measuring tool having means for generating a thickness signal indicative of the thickness of a ferromagnetic casing, and means for generating a permeability signal indicative of the permeability of the casing the improvement comprisng:

  • means for generating a corrected permeability signal corrected for the variations of inside diameter of the casing andmeans for generating a corrected thickness signal corrected for the variations of permeability of the casing.

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