【作者】 辛立静； 徐勤； 李鲠颖；

【Author】 Xin Lijing Xu Qin Li Gengying (Key Laboratory for Optical and Magnetic Resonance Spectroscopy,Department of Physics,East China Normal University,Shanghai 200062,China)

【机构】 光谱学与波谱学教育部重点实验室,华东师范大学物理系；

【摘要】 <正>脉冲梯度场是现代谱仪的重要组成部分,在核磁共振成像和高分辨核磁共振中已经有了极其广泛的应用。其设计是自行研制开发谱仪的基础。梯度场的产生在硬件上由梯度波形发生器、梯度电流放大器和梯度线圈组成。我们曾设计过一种梯度波形发生器,但是梯度涡流的存在大大影响了实验结更多还原

【Abstract】 The design of gradient waveform generator in NMR and MILl is presented.Its main features are simplicity,high performance and economy.Since arbitrary waveform can be triggered with only two external TTL lines,it can be integrated into different types of NMR spectrometer conveniently.In order to reduce the influence of the eddy-currents produced by the pulsed gradients,the pre-emphasis technique is also included.The pre-emphasis is implemented by a DSP constructed within the FPGA.Details about the design of gradient waveform generator will be given.更多还原