Precise defect echo wave orientation is one of main missions of ultrasonic testing (UT), wavelet transform (WT), as new method of signal processing, becomes suitable to analysis singular signal. Defect echo wave of A-UT is the typical singular signal; a' tuous algorithm needn't down-sampling and up-sampling when decompose and reconstruct signals, so it can improve precision of defect echo wave orientation, Using WT based on a' tuous algorithm shall have better effect on wave orientation than using Mallat algorithm. In this paper, wavelet transform based on a' tuous algorithm and its application in defect echo wave orientation of A-UT were studied, the precision-contrast between two algorithms was made, and it turned out that a' tuous algorithm can improve precision of defect echo wave orientation and achieve more information by experiment.
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