论文部分内容阅读
阐述核磁共振找水仪工作原理,并得出探测地下水深度主要受发射机发射脉冲矩影响的结论。根据找水仪发射机原理,分析出电容供电的过程中电压快速衰减的问题,导致发射机发射的有效时间短,激发的电流脉冲矩小;进而使地下水不能够充分的极化,接收弛豫信号小,还限制了仪器的探测的深度。针对找水仪发射机电源设计,论文提出在电容放电过程中同时采用恒压源对电容进行补偿,延缓电容的衰减过程。延长发射的脉冲时间,增大激发的电流脉冲矩,提高了发射机的极化地下水的效率,并有助于提升装置的探测深度。
Explain the working principle of NMR water finding instrument and draw the conclusion that the depth of groundwater is mainly affected by the transmitting pulse moment of the transmitter. According to the principle of water transmitter, the problem of rapid voltage decay in the process of capacitor power supply is analyzed, which results in short effective time of transmitter and small current pulse moment of excitation, so that groundwater can not be fully polarized and receive relaxation The small signal also limits the depth of the instrument’s detection. In view of the power supply design of water-finder transmitter, the paper proposes to use constant voltage source to compensate the capacitor in the process of capacitor discharge and delay the process of capacitor attenuation. Extend the pulse duration of the emission, increase the excitation current pulse moment, improve the efficiency of the transmitter’s polarized groundwater, and help to enhance the detection depth of the device.