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It is very important and effective that the online monitoring of partial discharge(PD) for the transformer to detecting defects. The sensitivity of online monitoring system has been influenced by strong external interference. With the development of computer and signal processing technology, many digital signal processing technologies, such as infinite impulse response filter, finite impulse response...
Electromagnetically induced acoustic emission (EMAE) technique is a new nondestructive testing (NDT). It does nondestructive detection with the effect of dynamic electromagnetic loading to generate a stress field stimulating stress waves from the defects. When EMAE is used to detect crack in the metal sheets, the EMAE signal is easy to be disturbed by various sources of noises, and the detectability...
The wavelet packet plays an important role in the signal processing of electromagnetic acoustic emission. It can eliminate signals noise, and basing on it, improves the accuracy of acoustic emission source location. The wavelet packet algorithm is a further breakdown of orthogonal wavelet decomposition; it allows the observation of characteristics of signal transaction in a narrower band, so it increases...
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