Papers by Keyword: Magnetic Lens

Abstract: Axial field distribution model of pole piece has a certain theory value in the design of magnetic lenses. In this paper, on the base of analyzing pole piece axial field distribution model which other authors had deduced, using the nonlinear least square method and the curve fitting tool of MATLAB software, the Gaussian model for axial field distribution is obtained. By comparing these models, the Gaussian model has higher precision and also has a certain practical reference value.

Abstract: It is important to estimate the intensity distribution of a magnetic field as a possible magnetic method in an industrial nondestructive evaluation application. A magnetic camera provides the distribution of a quantitative magnetic field with homogeneous lift-off and same spatial resolution. Magnetic flux leakage near a crack on the specimen can be amplified by using a 3- dimensional magnetic fluid, that is to say a magnetic lens. This study introduces the experimental consideration of the effects of magnetic lenses for concentrating of magnetic flux. The experimental results showed that the magnetic fluid has a sufficient lens effect for magnetic camera and effect of improvement in probability of detection.