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A novel approach to identifying the ultrasonic echoes for inspecting well cementing quality
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作者 YU Houquan HUANG Zailu and QU Wanli(Dept. of Electronics and Information Eng., Huazhong Universitg of Science and Technology Wihan 430074) 《Chinese Journal of Acoustics》 1997年第1期13-19,共7页
In this paper, it is presented that an approach based on Continuous Wavelet Thansform(CWT) and Fourier Transform(FT) for identifying ultrasonic echoes in inspecting oil well cementing quality. First, CWT is used to pr... In this paper, it is presented that an approach based on Continuous Wavelet Thansform(CWT) and Fourier Transform(FT) for identifying ultrasonic echoes in inspecting oil well cementing quality. First, CWT is used to process echo signals. Then spectra of the processing results in some specilic scale-time segments are calculated as pattern features. The research results show that theoretical calculations basically agree with experimental results. Compared with the aPproach based on the spectra or Discrete Wavlet Transform, our approach has advantages of fine analyzing scales, stable features and high recognizing rate. It is very suitable to identify echo signals whose spectra vary with time. 展开更多
关键词 WELL A novel approach to identifying the ultrasonic echoes for inspecting well cementing quality CWT
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