【摘要】 研究了小波变换在细尺度下检测信号奇异性的原理。通过对样管中标准缺陷的超声回波分析试验,证明6层db5小波变换可以有效地分离出湮没在噪声中的微弱缺陷信号,并可以有效地分离出信号的孤立奇异点,准确定位缺陷出现时刻。更多还原

【Abstract】 The theory of testing the signal singularity by wavelet transform under fine scale was studied.It was proved by the analysis of the ultrasonic echoes from the flaws in the pipe samples prepared that six-layer db5 wavelet transform could be used to separate weak flaw echoes from heavy noises effectively,extract the isolated singularity point and locate the arrival time of flaw echoes.更多还原