Abstract
The corrosion pits, rust, slag and dust of metal surface can cause a sharp bottom echo noise signal, and affect the accuracy of the thickness measurement values. This paper designed a set of ultrasonic reflection signal acquisition and processing circuit and wavelet packet analysis and reconstruction software, which can suppress noise and improve signal to noise ratio. Experiments show that the signal processing circuit and the wavelet packet technologies in non-smooth surface metal plate ultrasonic thickness measurement is effective and useful, which can obtain a more pure reflection of the ultrasonic bottom signal, thereby enhance the accuracy of thickness measurement.
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