相位可控的核四极矩共振激励脉冲发生器设计

doi:10.11938/cjmr20202809

波谱学杂志 ›› 2020, Vol. 37 ›› Issue (4): 515-523.doi: 10.11938/cjmr20202809

相位可控的核四极矩共振激励脉冲发生器设计

雒媛, 朱凯然

西安石油大学电子工程学院, 陕西西安 710065

收稿日期:2020-02-18 出版日期:2020-11-05 发布日期:2020-04-24
通讯作者: 朱凯然,Tel:18092160918,E-mail:krzhu@xsyu.edu.cn. E-mail:krzhu@xsyu.edu.cn
基金资助:
国家自然科学基金青年项目（41804115）；陕西省自然科学基础研究计划项目（2018JQ4008）；陕西省教育厅科研计划重点项目（18JS094）；西安市科技计划项目（2017081CGRC044）.

A Phase-Controllable Nuclear Quadrupole Resonance Excitation Pulse Generator

LUO Yuan, ZHU Kai-ran

School of Electronic Engineering, Xi'an Shiyou University, Xi'an 710065, China

Received:2020-02-18 Online:2020-11-05 Published:2020-04-24

摘要/Abstract

摘要： 在核四极矩共振（NQR）领域，射频激励脉冲信号的优劣对NQR响应信号有重要影响.针对常规方法中射频激励脉冲参数不可控的问题，本文基于32位闪存微型控制器STM32和直接数字频率合成（DDS）芯片AD9910设计了一种相位可控激励脉冲发生器.采用STM32控制AD9910产生波形参数（脉冲宽度、脉冲间隔、脉冲个数和共振频率等）可控的射频激励脉冲，利用LabVIEW软件平台设计脉冲参数设置界面，并建立计算机与微控制器通信，实现波形参数的精确优化控制.实验结果表明，该方法实现了相位可控的NQR激励脉冲序列，可为后续NQR信号检测提供有效激励源.

关键词: 核四极矩共振（NQR）, 相位可控激励脉冲, 直接数字频率合成（DDS）, STM32

Abstract: The quality of the radio frequency (RF) excitation pulse signal has important effects on nuclear quadrupole resonance (NQR) response signal. In this work, a phase-controllable excitation pulse generator was designed based on the 32-bit flash microcontroller STM32 and the direct digital frequency synthesis (DDS) chip AD9910. STM32 is used to control the AD9910 to generate RF excitation pulses with controllable carrier phase. The LabVIEW software platform was used to design the pulse parameter setting interface, and the computer and microcontroller were established to communicate. This design achieved precise and optimized control of the waveform parameters (i.e., pulse width, pulse interval, number of pulses and resonance frequency) for the RF pulse. Experimental results demonstrated that this method could be used to obtain a phase-controlled NQR excitation pulse sequence, providing an effective excitation source for subsequent NQR signal detection.

Key words: nuclear quadrupole resonance (NQR), phase-controllable excitation pulse, direct digital frequency synthesis (DDS), STM32

中图分类号:

O482.53

雒媛, 朱凯然. 相位可控的核四极矩共振激励脉冲发生器设计[J]. 波谱学杂志, 2020, 37(4): 515-523.

LUO Yuan, ZHU Kai-ran. A Phase-Controllable Nuclear Quadrupole Resonance Excitation Pulse Generator[J]. Chinese Journal of Magnetic Resonance, 2020, 37(4): 515-523.

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相位可控的核四极矩共振激励脉冲发生器设计

A Phase-Controllable Nuclear Quadrupole Resonance Excitation Pulse Generator

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