Ultrasonic Flaw Echoes Detection Based on Generalized S-Transform
- Authors: Zeng X.1, Yang C.L.1, Zhou X.J.1, Chen Y.C.2
-
Affiliations:
- State Key Laboratory of Fluid Power Transmission and Control
- 715th Research Institute of China Shipbuilding Industry Corporation
- Issue: Vol 54, No 2 (2018)
- Pages: 137-145
- Section: Ultrasonic Methods
- URL: https://journals.rcsi.science/1061-8309/article/view/181564
- DOI: https://doi.org/10.1134/S1061830918020080
- ID: 181564
Cite item
Abstract
Micro defects usually lead to performance degradation of materials. Pulse-echo technique is an effective method of revealing micro defects in materials, and booming in which has been witnessed over the years. However, detection of flaw echoes submerged in intensive noise is challenging. In this paper, a method of flaw echoes detection based on generalized S-transform is proposed. The original signals are transformed to time-frequency domain by generalized S-transform in the first stage. Subsequently, the time-frequency spectrums are enhanced through image segmentation techniques, including global thresholding and dilation. Finally, clear flaw echoes are obtained by inverse generalized S-transform, contributing to further investigation of defects. Both the simulation and experimental results show effectiveness of the flaw echoes detection method.
About the authors
X. Zeng
State Key Laboratory of Fluid Power Transmission and Control
Author for correspondence.
Email: zxzjume2012@gmail.com
China, Hangzhou
C. L. Yang
State Key Laboratory of Fluid Power Transmission and Control
Email: zxzjume2012@gmail.com
China, Hangzhou
X. J. Zhou
State Key Laboratory of Fluid Power Transmission and Control
Email: zxzjume2012@gmail.com
China, Hangzhou
Y. C. Chen
715th Research Institute of China Shipbuilding Industry Corporation
Email: zxzjume2012@gmail.com
China, Hangzhou