【作者】 姜艳秋；

【导师】 王应吉；

【作者基本信息】 吉林大学 ， 电力电子与电力传动， 2006， 硕士

【摘要】 地面核磁共振找水方法是目前世界上唯一直接找水的地球物理方法。目前只有法国拥有商品化的核磁共振找水仪器。本文结合国内外核磁共振找水方法和仪器,提出了地面核磁共振找水仪发射机的设计方案,并且完成了样机的研制。论文重点讲述了地面核磁共振找水仪发射机的总体方案设计及其关键技术的研究。论文首先论述核磁共振找水原理及仪器工作原理,剖析了国内外核磁找水仪器的发展现状和设计特点,提出了核磁共振找水仪发射机的总体设计方案。论文中主要论述了核磁共振找水仪发射机中的四项关键技术的设计与实现:大功率电源技术,拉莫尔频率激发信号的产生及同相位发射技术,H桥逆变技术,发射及快速切换技术。在系统测试部分,包括性能指标测试和野外实验,对实验结果进行了详细的分析。最后作了全文总结,并给出了进一步工作的建议。更多还原

【Abstract】 It wasn’t able to investigate underground water directly until the technology of NMR (Nuclear Magnetic Resonance) was used in the geophysics. Our country is one of thirteen countries that lack of water on the average. More and more importance has been attached to research of investigating water with NMR technique and it would become the key technique to investigate groundwater. The instrument includes two parts: transmitter system and collection system. The transmitter is the main equipment, and its technique level impacts the depth of water investigation. The content of the thesis is to develop the transmitter with the big current to investigate the deeper groundwater.In order to make the H proton of groundwater produce the NMR phenomenon, the big power of transmitter system with Lamor frequency pulses is provided to the loop. The alternating current generates alternating magnetic field. The frequency precision of transmitter, the order of signal degree and the transmitting current magnitude affect the signal precision and reliability of the NMR signal. The transmitter is required that the transmitting更多还原