通用核磁共振测井脉冲序列发生器的逻辑设计

在测井领域，伴随着核磁共振技术广泛的应用和核磁共振技术的进步，新的核磁共振序列不断被提出，这对核磁共振测井仪的脉冲序列发生器提出了更多更复杂的要求。在此背景下，新型脉冲序列发生器须满足高精度、灵活的编程能力、良好的通用性要求。为了同时满足新的和传统的要求，在总结传统脉冲序列和新型脉冲序列的特征要素基础上，提出了一种可通过配置得到目标序列的脉冲序列发生器的逻辑设计，给出了关键的设计说明。最后通过可编程逻辑器件 FPGA 进行验证。该序列发生器可配置生成 CPMG、DE 等一系列脉冲序列，表现出较好的灵活性和通用性。

Logic design of a universal pulse programmer for NMR well logging

In well logging area, along with the widely application and advancement of NMR technology, new pulse sequences have been proposed successively, which inspires more complicated demand for the pulse programmer of NMR well logging tools. In this context, the new pulse programmer must fulfill the requirements including high accuracy, flexible programmability and well generality. In order to meet the latest as well the traditional demand, based on the summary of the features of traditional pulse sequences and new pulse sequences, this paper proposes the logic design which can derive pulse sequences as desired by configuration. The key design specification is illustrated. Then it is verified by programmable logic device FPGA. This pulse programmer can generate CPMG, DE pulse sequence and other terms of pulse sequences, which performs well flexibility and universality.