本文選題：聲學探測 + D類功率放大器�。� 參考：《南京理工大學》2015年碩士論文

【摘要】：據(jù)估計,海洋蘊藏了全球超過70%的油氣資源,隨著工業(yè)化進程的不斷推進,我國原油、天然氣對外依存度已越來越高。從保障國家安全的角度考慮,我國必須將能源的開發(fā)目光投向海洋。目前,世界海洋天然氣探明率為60.5%,而我國僅為10.9%,因此,如何有效探測這些潛在的能源成了這項戰(zhàn)略任務的首要問題。本文對海底“冷泉”聲學探測系統(tǒng)的硬件展開了深入研究。論文首先從理論出發(fā),建立了探測系統(tǒng)的硬件總體架構和指標,分析了探測系統(tǒng)的可行性；接著,設計、制作了水聲信號發(fā)射機和信號調理機硬件電路,并對其中的關鍵模塊D類功率放大器的∑-△調制、自激振蕩、功率放大級、死區(qū)時間控制、過流檢測、信號解調和供電模塊等電路展開了深入研究,對功率放大器和換能器基陣之間的寬帶匹配網絡、信號調理機各級電路進行了深入分析和設計。最后,對所設計的系統(tǒng)進行了測試和湖上驗證。該系統(tǒng)在湖上探測氣泡的試驗結果顯示該系統(tǒng)可以有效探測到水中的氣泡。通過改變換能器姿態(tài)以及探測頻率進行測試,獲得了預期的試驗效果。這也驗證了本文設計的硬件系統(tǒng)的正確性。本課題的難點在于：基于∑-△調制的大功率發(fā)射機的實現(xiàn)、換能器寬帶匹配和時變增益信號調理機。本文克服了各種困難,設計了可靠的水聲信號發(fā)射機和信號調理機硬件電路。
[Abstract]:It is estimated that the ocean contains more than 70% of the world's oil and gas resources. With the continuous advancement of industrialization, China's crude oil and natural gas are more and more dependent on foreign dependence. From the point of view of ensuring national security, our country must focus on the development of energy in the ocean. At present, the exploration rate of the world's marine natural gas is 60.5%, but China is only 10.9%, Therefore, how to effectively detect these potential energy sources has become the primary problem of this strategic task. This paper studies the hardware of the acoustic detection system for the "cold spring" of the sea bottom. Firstly, the paper sets out the overall hardware structure and index of the detection system from the theory, and analyzes the feasibility of the detection system; then, design and make the production. The hardware circuit of the acoustic signal transmitter and signal conditioner is made, and the key modules D class power amplifier's sigma delta modulation, self excited oscillation, power amplification stage, dead time control, over current detection, signal demodulation and power supply module are deeply studied, and the broadband matching network between power amplifier and transducer array is carried out. The system has been analyzed and designed at all levels of the signal conditioner. Finally, the system is tested and the lake is verified. The test results of the system on the Lake show that the system can detect the bubbles in the water effectively. The desired test is obtained by changing the transducer attitude and detection frequency. It also validates the correctness of the hardware system designed in this paper. The difficulty of this topic lies in the realization of the high-power transmitter based on the sigma delta modulation, the broadband matching of the transducer and the time variable gain signal conditioner. This paper overcomes various difficulties and designs a reliable acoustic signal transmitter and the hardware circuit of the signal conditioner.

【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE95

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本文編號：1847637