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首页> 外文期刊>NDT & E international >Automated and antidispersive coherent and incoherent noise reduction of waveforms that contain a reference pulse
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Automated and antidispersive coherent and incoherent noise reduction of waveforms that contain a reference pulse

机译：包含参考脉冲的波形的自动和反分散相干和非相干降噪

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Fully automated and antidispersive noise reduction of a waveform containing a reference pulse is often necessary for more efficient, accurate, and reliable interpretation of signals - such as highly attenuated waves in ultrasonic NDE. We propose two methods, pulse specification (PS) and coherent enhanced pulse specification (CEPS), for improving the signal-to-noise ratio (SNR) of coherent pulse amplitudes against both incoherent and coherent noise, as well as apply complementary antidispersive pulse generation (APG) to localise the pulse upon reception. We have demonstrated PS and CEPS effectiveness, with and without APG, using two examples of ultrasonic inspection, by comparison with established methods and demonstrated improvements in SNR up to a factor of 2 (6.02 dB) and never less than 1 (0 dB) for favoured pulse specifications. This has benefits in applications such as NDE, medical ultrasonics, seismology, and acoustics.We deconvolve waveforms using a reference pulse time windowed from said waveforms. These waveforms are convolved with pulses that have centre frequencies and bandwidths that are optimally and automatically specifiable for that unprocessed waveform. We combine independent measurements of the waveforms using PS and CEPS to maximise the coherent pulse amplitude of known scatterers and minimise the noise content. CEPS also enhances the coherent scatterer amplitude to significantly greater than achieved using an established filtered time shift method - where the time shift is subjective. Unlike such time shift methods, PS and CEPS do not reduce the amplitude of the coherent pulse signals when reducing noise.Automated and antidispersive coherent and incoherent noise reduction by pulse specification has been demonstrated to be effective in ultrasonic NDE of both damping and scattering media. Suggestions for further applications of this method have already included application to ultrasonic NDE of composite media, application to ultrasonic guided wave NDE, ultrasonic NDE imaging that can include ultrasonic B-scans, and more. This is greatly encouraging regarding the potential immediate applicability of noise reduction by pulse specification.
机译：为了更有效，准确和可靠地解析信号（例如超声NDE中的高衰减波），通常需要对包含参考脉冲的波形进行全自动且抗分散的降噪。我们提出了两种方法：脉冲规范（PS）和相干增强脉冲规范（CEPS），以提高相干脉冲幅度对非相干噪声和相干噪声的信噪比（SNR），并应用互补的抗分散脉冲生成（APG）以在接收时定位脉冲。通过与已建立的方法进行比较，我们使用两个超声波检测示例证明了使用APG和不使用APG的PS和CEPS的有效性，并证明了SNR的改进高达2（6.02 dB），且从不小于1（0 dB）首选脉冲规格。这在诸如NDE，医学超声，地震学和声学等应用中具有优势。我们使用从所述波形开窗的参考脉冲时间对波形进行反卷积。这些波形与具有中心频率和带宽的脉冲进行卷积，这些中心频率和带宽可针对该未处理的波形最佳且自动地指定。我们结合使用PS和CEPS对波形进行独立测量，以使已知散射体的相干脉冲幅度最大，并使噪声含量最小。 CEPS还可以将相干散射体的幅度提高到明显大于使用已建立的滤波时移方法所达到的程度，在这种方法中，时移是主观的。与此类时移方法不同，PS和CEPS在降低噪声时不会降低相干脉冲信号的幅度。已证明通过脉冲规范自动和反分散相干和非相干噪声降低可有效用于阻尼介质和散射介质的超声NDE。对于该方法的进一步应用的建议已经包括对复合介质的超声NDE的应用，对超声导波NDE的应用，可以包括超声B扫描的超声NDE成像等等。对于通过脉冲规范进行降噪的潜在直接适用性，这是极大的鼓舞。

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