Marine physics

Signal Processing and Spectrum Analysis of Acoustics Measuring over Seafloor Sediment in Temperature Perturbation Condition

  • ZEN Jie-ying ,
  • ZOU Da-peng ,
  • WU Bai-hai ,
  • ZHANG Wen-fan
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  • 1.Faculty of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510090, China; 2. State Key Lab of Acoustics, Institute of Acoustics, Chinese Academy of Science, Beijing 100080, China

Received date: 2008-11-15

  Revised date: 2009-01-06

  Online published: 2010-02-05

Abstract

Temperature, salinity, and pressure are the three effectors of marine sediment’s physical, mechanical and acoustic properties. The authors focus on the effect of temperature perturbation on seafloor sediment, and study the spectrum Characteristics. They use the sediment remainder of the South China Sea, make artificial samples and then place them in a temperature-controlled environment, measure the sediment acoustic signals, and finally obtain the sediment’s spectrum characteristics by fast Fourier transform. The characteristics of temperature perturbation can be described by frequency drift, frequency amplitude, frequency bandwidth, and energy reception, respectively. For example, temperature contributes to the seafloor sediment’s spectrum regularity, with low repeatability; temperature increase enhances acoustic signal attenuation; frequency bandwidth and amplitude are negatively correlated, but the correlation of thermal-amplify is much clearer than thermal-bandwidth. The experiment suggests that the frequency in different temperature distinguishes the acoustics spectrum.

Cite this article

ZEN Jie-ying , ZOU Da-peng , WU Bai-hai , ZHANG Wen-fan . Signal Processing and Spectrum Analysis of Acoustics Measuring over Seafloor Sediment in Temperature Perturbation Condition[J]. Journal of Tropical Oceanography, 2009 , 28(4) : 79 -86 . DOI: 10.11978/j.issn.1009-5470.2009.04.079

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