Signal Processing of Magnetic Flux Leakage Inspection of Pipeline Based on Wavelet Transform

Non-destructive testing is developing in the direction of automatization and intelligentization, but there still exists some difficulty in analyzing quantitatively the signal of magnetic flux leakage. The Mallat quick algorithm of wavelet transformation is described simply. As an advanced digital signal processing method, wavelet transformation can be used to compress data and separate the signal and the noise in the magnetic flux leakage inspection. So introducing wavelet transformation into the magnetic flux leakage inspection provides high feasibility for the quantitative analysis of the test signals.