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

  • He-Zhen WuEmail author
  • Wei Zhu
  • Tai-Ming He
  • Zheng-Yi Liu
  • Xiao-Wen Lan
Article
  • 26 Downloads

Abstract

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.

Keywords

Rock ultrasound testing barker code golay-coded excitation pulse compression 

Notes

Acknowledgements

This research is supported by National Natural Science Foundation of China (41104117), and a research grant from the Institute of Crustal Dynamics, China Earthquake Administration (No. ZDJ2013-10).

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Institute of GeophysicsChinese Earthquake AdministrationBeijingChina
  2. 2.Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina
  3. 3.Institutions of Earth ScienceChinese Academy of SciencesBeijingChina
  4. 4.Key Laboratory of Seismic Observation and Geophysical Imaging, Institute of GeophysicsChinese Earthquake AdministrationBeijingChina
  5. 5.Institute of Crustal DynamicsChinese Earthquake AdministrationBeijingChina

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