海底“冷泉”声学探测系统硬件设计

发布时间：2018-05-05 12:09

本文选题：声学探测 + D类功率放大器　；参考：《南京理工大学》2015年硕士论文

【摘要】：据估计,海洋蕴藏了全球超过70%的油气资源,随着工业化进程的不断推进,我国原油、天然气对外依存度已越来越高。从保障国家安全的角度考虑,我国必须将能源的开发目光投向海洋。目前,世界海洋天然气探明率为60.5%,而我国仅为10.9%,因此,如何有效探测这些潜在的能源成了这项战略任务的首要问题。本文对海底“冷泉”声学探测系统的硬件展开了深入研究。论文首先从理论出发,建立了探测系统的硬件总体架构和指标,分析了探测系统的可行性；接着,设计、制作了水声信号发射机和信号调理机硬件电路,并对其中的关键模块D类功率放大器的∑-△调制、自激振荡、功率放大级、死区时间控制、过流检测、信号解调和供电模块等电路展开了深入研究,对功率放大器和换能器基阵之间的宽带匹配网络、信号调理机各级电路进行了深入分析和设计。最后,对所设计的系统进行了测试和湖上验证。该系统在湖上探测气泡的试验结果显示该系统可以有效探测到水中的气泡。通过改变换能器姿态以及探测频率进行测试,获得了预期的试验效果。这也验证了本文设计的硬件系统的正确性。本课题的难点在于：基于∑-△调制的大功率发射机的实现、换能器宽带匹配和时变增益信号调理机。本文克服了各种困难,设计了可靠的水声信号发射机和信号调理机硬件电路。
[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.

【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE95

【参考文献】