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One-dimensional eddy current multi-frequency data fusion : a multi-resolution analysis approach
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1998
Year
EngineeringSingle Measurement MethodMeasurementMechanical EngineeringMulti-sensor Information FusionEducationGeophysical Signal ProcessingMulti-resolution MethodCondition MonitoringMagnetohydrodynamicsComputational ElectromagneticsInstrumentationNondestructive TestingMulti-resolution Analysis ApproachData FusionMultidimensional Signal ProcessingStructural Health MonitoringInverse ProblemsFusion ProcessSignal ProcessingBasic Fusion Algorithm
The application ofdata fusion in the field of non-destructive testing (NDT) has become attractive in recent years. It is believed that a single measurement method or condition is not enough to discover all the characters of the objects examined. Researchers try to fuse the information from different resources. In eddy current testing (ET), the multi-frequency method is often applied for its 'skin effect'. In this paper, we introduce the multi-resolution analysis method to fuse the information obtained at different frequencies, which enhances the one-dimension eddy current Signal-to-Noise Ratio (SNR). The information on cracks on both sides of the specimen can be emphasised by the fused signal. The fusion process is achieved in the transform domain. The maximum selection rule is applied as the basic fusion algorithm. The application of a revised maximum method is also discussed.