Signal-to-Noise Ratio Improvement based on the Discrete Wavelet Transform in Ultrasonic Defectoscopy

Acta Polytechnica

M. Kreidl¹  R. Šmíd¹  V. Matz¹ 

关键词: ultrasonic testing;    discrete wavelet transform;    de-noising algorithms;   

DOI  :  

来源: Czech Technical University in Prague, Faculty of M

【 摘 要 】

In ultrasonic testing it is very important to recognize the fault echoes buried in a noisy signal. The fault echo characterizes a flaw in the material. An important requirement on ultrasonic signal filtering is zero-time shift, because the position of ultrasonic echoes is essential. This requirement is accomplished using the discrete wavelet transform (DWT), which is used for reducing the signal-to-noise ratio. This paper evaluates the quality of filtering using the discrete wavelet transform. Additional computer simulations of the proposed algorithms are presented.

【 授权许可】

Unknown