Title page for etd-0110117-152714


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URN etd-0110117-152714
Author Xiang-rong Luo
Author's Email Address No Public.
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Department Institute of Undersea Technology
Year 2016
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Test of the Differential Pressure Gauge
Date of Defense 2017-01-19
Page Count 75
Keyword
  • DPG
  • OBS
  • infragravity wave
  • teleseismic wave
  • Abstract An Ocean Bottom Seismometer (OBS) is an instrument designed to record seismic waves as electronic signals, in order to obtain more precise seismic information from the surrounding waters. However, teleseismic waves have a low energy level, such that teleseismic signals typically cannot be distinguished from the ambient noise received by an OBS. Among the different types of ambient noise received by an OBS, infragravity waves are long-period signals, generated by the interactions between ocean waves and coastlines, which essentially overlap the low-frequency teleseismic signals. A Differential Pressure Gauge (DPG) is an instrument designed to detect low-frequency changes of pressure in the water, due to small fluctuations of the water surface. Therefore, an integrated system comprised of an OBS and a DPG is able to detect infragravity waves with frequencies ranging from 0.003 Hz to 0.03 Hz by the DPG. As a result, teleseismic waves received by the OBS can be analyzed to determine whether or not they interfered with infragravity waves. The critical issue of this research is that whether a DPG has a frequency response that can cover the periodic changes of pressure in the ocean caused by infragravity waves.Thus, in this research, we developed a mechanism that drives a DPG with simple harmonic motion inside a small water tank for periodic pressure tests. We also performed spectrum analysis on the DPG data to obtain the frequency response and characteristics of the DPG, so as to evaluate the DPG's capability of detecting infragravity waves in the ocean.
    Advisory Committee
  • Hsin-Hung Chen - chair
  • Yu-Cheng Chou - co-chair
  • Yuan-Ying Chang - co-chair
  • Chau-Chang Wang - advisor
  • Files
  • etd-0110117-152714.pdf
  • Indicate in-campus at 2 year and off-campus access at 2 year.
    Date of Submission 2017-02-10

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