核磁共振测井仪高压发射控制时序设计与应用

Design and Application of High Pressure Emission Control Timing for the NMR Logging Tool

为设计一种高压发射控制时序,基于核磁共振测井仪高压发射控制原理,分析采用DDS技术实现高压发射控制时序的可行性。描述DDS模块设计过程,其核心组件为32bit相位累加器,采用流水线性技术实现;功能仿真结果表明,满足不同初始相位不同频率正交信号合成。实际应用表明,设计的高压发射控制时序满足核磁共振测井仪多频工作模式、初始相位交替变换和高压发射控制要求。

In order to design a high-voltage emission control timing,this paper analyzes the feasibility of adopting DDS technology to realize high-voltage emission control timing based on high-voltage emission control theory of NMR logging tool.In addition,this paper also describes the process of designing the DDS module,the core component of which is a 32-bit phase accumulator that can be implemented through the pipeline linear technology.The functional simulation results show that it can produce different initial phase and different frequency orthogonal signal.The practical application shows that the design of high-voltage emission control timing meets the requirements of NMR logging tool such as multi-frequency mode of operation,the initial phase alternation and high-voltage emission control.