地面核磁共振(NMR)找水仪发射机的研制

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。本文介绍一种基于谐振原理的大功率，高精度地面核磁共振发射机。该发射机采用DDS产生当地拉莫尔频率，通过大功率开关电路产生功率方波，由发射线圈和谐振电容产生谐振，实现大功率发射。本设计具有输出功率大，频率精度高，重量轻等优点，已成功用于地面核磁共振找水仪样机中。

Development of the transmitter in a surface NMR water investigation instrument

The surface nuclear magnetic resonance(NMR) is the only means of geophysics to directly detect underground water in the world now.A high-power,high-precision surface NMR transmitter based on the resonance principle is discussed.The transmitter adopts DDS to generate local Larmor frequency for the region.A high-power switching circuit generates the high-power square wave,which resonates in the transmitter coil and the resonant capacitor to achieve high-power transmission.This design features many merits such as high output power,high frequency precision,light weight,etc.,and has been successfully applied in the surface NMR water investigation prototype.