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Applications of remote field eddy current testing are severely restricted by disadvantages such as weak signals and over-long sensors. New methods used to overcome these disadvantages are investigated as follows: firstly, optimal sensor design methods including shielding and magnetic circuits are introduced to shorten the length of the sensor and enhance signal magnitude, and finite element method (FEM) is used to determine appropriate sensor length so as to get an optimal design compromise between sensitivity and signal magnitude. At the same time, a data acquisition system with orthogonal lock-in amplifier is used for weak signal measurement. Secondly, advanced digital signal processing techniques such as the homomorphic filter, wavelet transform and error correction are investigated to ensure detection reliability. Lastly, experimental results are presented showing that better performance has been achieved.
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Xiao-jie et al. (2006) studied this question.
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