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研究生:陳思宇
研究生(外文):Ssu-yu Chen
論文名稱:發展掃頻聲納系統量測海床反射係數-舉台灣西南海域為例
論文名稱(外文):Development of chirp sonar system and Its application
指導教授:邱永盛邱永盛引用關係
指導教授(外文):Linus Y.S. Chiu
學位類別:碩士
校院名稱:國立中山大學
系所名稱:海下科技研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:103
語文別:中文
論文頁數:99
中文關鍵詞:底質剖面儀掃頻聲納反射係數震測影像台灣西南海域
外文關鍵詞:offshore southwestern Taiwansub-bottom profilerchirp sonarreflection coefficienseismic images
相關次數:
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在海洋工程及海洋聲學應用中,海床之地質結構與物理特性是海洋工程與水下技術中極重要的一環,現今常被用來進行海洋地質研究的工具之一就是海床聲學剖面探測系統,使用海床聲學剖面探測系統可獲得底床表層沉積層資訊,但一般市售海床聲學剖面探測系統皆為獨立封閉系統,訊號模式與內建之訊號處理方式均已固定,往往僅提供少數選項供使用者選擇,限制了探測資料分析上之彈性與結果。根據上述限制,本研究自行開發建置掃頻聲納探測系統,包括硬體系統建置、訊號模組建置及訊號處理技術發展等。其次,本研究為測試本掃頻聲納系統之正確性以自行建置之系統於實海域進行量測實驗,測試實驗地點皆於台灣西南海域,共包含海研二號、三號共6次航次。測試中亦針對本系統進行校正實驗,以獲得系統之聲源聲壓位準及接收靈敏度。
實驗結果顯示本研究自製之掃頻聲納探測系統可提供高品質的地質結構聲學影像,以及本研究使用蒐集的回波資料計算反射係數,了解其實驗海域之回波特性。
Acoustical sub-bottom profiler (Chirp sonar) is widely used as a survey tool to image sediment structure. Chirp sonar data inversion has been used to determine sediment layering and physical properties in underwater acoustics applications. Chirp sonar echoes can be used to measure acoustic reflection coefficients at normal incidence to the seabed and attenuation roll-off rates of surficial sediments. The aim of this research is to (1) develop acoustical sub-bottom profiler and (2) to estimated seabed reflection coefficient and compare with coring data. This research is to integrate acoustic transducer, amplifier, and DAQ system as a independent system for acoustic profiler. The developed prototype of the acoustical sub-bottom profiler has been used and tested in the southwestern sea off Taiwan. This tool lends itself to various tasks that include imaging fluidized mud greater 40 meters, sediment classification, marine geotechnical surveys, hazardous waste target location, geological surveys, archeological surveys, mapping clam populations, military and offshore oil applications, and full ocean depth sub-bottom imaging.
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第一章 緒論… 1
1.1 研究動機與背景 1
1.2 文獻回顧 3
1.3 研究目的 5
第二章 研究方法 6
2.1 系統儀器設備 7
2.1.1 波束寬 13
2.2 訊號設計 15
2.3 其它設備儀器 18
2.3.1 科學測深儀 18
2.3.2 溫壓記錄器 18
2.3.3 重力岩心採樣器 19
2.3.4 抓攫式沈積物採樣器 20
2.4 資料處理及計算方法 21
2.4.1 聲壓位準 21
2.4.2 脈衝壓縮 22
2.4.3 反射係數計算 25
第三章 系統測試實驗 31
3.1 校正實驗 31
3.2 定點漂流實驗 45
3.3 拖曳測線實驗 50
3.4 小結 53
第四章 實驗結果與分析 55
4.1 定點漂流實驗結果 55
4.2 拖曳測線實驗結果 65
4.3 討論及建議 75
第五章 結論… 76
5.1 結論 76
參考文獻… 78
附錄A Biot理論 81
附錄B 實驗日誌與採樣資訊 85
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