Application of Coded Excitation Signals for Measurement of Rock Ultrasonic Wave Velocity

被引：0

作者：

He-Zhen Wu

Wei Zhu

Tai-Ming He

Zheng-Yi Liu

Xiao-Wen Lan

机构：

[1] Chinese Earthquake Administration,Institute of Geophysics

[2] Chinese Academy of Sciences,Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics

[3] Chinese Academy of Sciences,Institutions of Earth Science

[4] Chinese Earthquake Administration,Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of Geophysics

[5] Chinese Earthquake Administration,Institute of Crustal Dynamics

来源：

Pure and Applied Geophysics | 2020年 / 177卷

关键词：

Rock ultrasound testing; barker code; golay-coded excitation; pulse compression;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The accurate measurement of ultrasonic velocity requires the detected waveforms to have a high signal-to-noise ratio (SNR). Coded excitation technique (CET) can improve the SNR without resolution loss. This study introduces the basic principles of phase-coded technology and gives a synthetic and experimental evaluation of Barker and Golay codes. All the results show that CET can increase the SNR, but the gain in SNR (GSNR) is lower than the theoretical value. The velocity measurements on red sandstone and granite verify that the Barker code has better pulse compression performance than the Golay code. Besides, the application of Barker-coded signals on the velocity monitoring of uniaxially compressed rock proves that the Barker CET is reliable.

引用

页码：487 / 496

页数：9

共 27 条

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