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An apparatus comprising a processor configured to implement a method comprising obtaining a pipe profile comprising a diameter, a nominal thickness, and a material, receiving a magnetic flux leakage (MFL) indication for a pipe associated with the pipe profile, and determining a wall thickness for the pipe using the pipe profile and the MFL indication. Also disclosed is a method comprising modeling an apparatus comprising a magnet configured to induce a magnetic field in a pipe, and determining a wall thickness measurement (WTM) for the pipe using a model of the apparatus and the pipe, a detected MFL signal, and a simulated MFL signal.

Titel:	Measurement of pipe wall thickness using magnetic flux leakage signals
Autor/in / Beteiligte Person:	Dutta, Sushant Madhukul ; Ghorbel, Fathi Hassan
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2009
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20090243604 Publication Date: October 1, 2009 Appl. No: 12/411180 Application Filed: March 25, 2009 Assignees: William Marsh Rice University (Houston, TX, US) Claim: 1. An apparatus comprising: a processor configured to implement a method comprising: obtaining a pipe profile comprising a diameter, a nominal thickness, and a material; receiving a magnetic flux leakage (MFL) indication for a pipe associated with the pipe profile; and determining a wall thickness for the pipe using the pipe profile and the MFL indication. Claim: 2. The apparatus of claim 1, wherein the wall thickness is calculated without using empirical data. Claim: 3. The apparatus of claim 1, wherein calculating the wall thickness comprises solving a plurality of Maxwell's equations. Claim: 4. The apparatus of claim 3, wherein the Maxwell's equations are solved using a finite element method. Claim: 5. The apparatus of claim 3, wherein the Maxwell's equations comprise a permeability tensor for a ferromagnetic core, a permeability tensor for a pipe, a permeability tensor for a magnet, and the magnet's magnetization vector. Claim: 6. The apparatus of claim 1, wherein a simulated MFL indication is also used to determine the wall thickness for the pipe. Claim: 7. The apparatus of claim 6, wherein the simulated MFL indication is calculated using a tuning factor, the received MFL indication, and a reference pipe profile. Claim: 8. The apparatus of claim 1, wherein the pipe model is axis-symmetric. Claim: 9. The apparatus of claim 1, wherein the pipe comprises a wall thinning defect that ranges from about five percent to about 50 percent of the pipe's original wall thickness. Claim: 10. The apparatus of claim 1 further comprising: a magnet; a core coupled to the magnet; and a sensor coupled to the processor and the magnet, the core, or both. Claim: 11. A method comprising: modeling an apparatus comprising a magnet configured to induce a magnetic field in a pipe; and determining a wall thickness measurement (WTM) for the pipe using a model of the apparatus and the pipe, a detected magnetic flux leakage (MFL) signal, and a simulated MFL signal. Claim: 12. The method of claim 11 further comprising calibrating the simulated MFL signal. Claim: 13. The method of claim 12, wherein the simulated reference signal is calibrated using a tuning factor to match the simulated MFL signal's value to the detected MFL signal's value. Claim: 14. An apparatus comprising: a magnet; a core coupled to the magnet; a sensor system coupled to the magnet, the core, or both, and configured to detect a magnetic flux leakage (MFL) signal from a pipe; and a processor coupled to the sensor system and configured to calculate a wall thickness measurement (WTM) for the pipe using the MFL signal and a mathematical model of the magnet and the core. Claim: 15. The apparatus of claim 14, wherein the magnet, the core, and the sensor system are part of an automated robotic system that is translated along the pipe's length. Claim: 16. The apparatus of claim 14, wherein a sensor system comprises a Hall-effect sensor. Claim: 17. The apparatus of claim 14, wherein the magnet, the core, and the sensor system are positioned inside the pipe, and wherein the sensor system comprises a plurality of sensors distributed around the periphery of the core. Claim: 18. The apparatus of claim 14, wherein the magnet, the core, and the sensor system are positioned outside the pipe. Claim: 19. The apparatus of claim 14, wherein the magnet comprises a permanent magnet. Claim: 20. The apparatus of claim 14, wherein the magnet comprises a coil. Current U.S. Class: 324/229 Current International Class: 01

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Measurement of pipe wall thickness using magnetic flux leakage signals