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Academic Articles
Regular Paper (Contributed) Vol.3, No.1 (2011) p.1 - p.10

Evaluation of Defect Shape Based on Inverse Analysis Considering the Resolution of Magnetic Sensor

Shogo NAKASUMI1,* Takayuki SUZUKI1
1National Institute of Advanced Industrial Science and Technology (AIST), East 1-2-1 Namiki, Tsukuba, Ibaraki 305-8564, Japan
(Received; For the use of JSM)
This paper presents a technique for improving the accuracy of non-destructive evaluation using magnetic flux leakage. Response function that associates magnetic dipoles and magnetic flux densities in terms of geometrical coordinate is modified so as to capture the average magnetic flux value along the sensor length, that is consistent with experimentally measured magnetic flux. Inverse analysis of a semi-elliptical surface defect is conducted through numerical simulation. By using the modified response function, the restored defect shape becomes more proper and remarkable improvements are indicated, especially in low lift-off cases.
magnetic flux leakage, flux gate sensor, inverse analysis, non-destructive evaluation, magnetic dipole, Tikhonov regularization
Full Paper: PDF EJAM Vol.2 pp.160-167 "Numerical Simulation of Residual Stress Measurement with Acoustic Wave"
Article Information
Article history:
Received 28 March 2011
Accepted 24 May 2011