Samila Andriy, Hotra Oleksandra, Majewski Jacek
Department of Radio Engineering and Information Security, Yuriy Fedkovych Chernivtsi National University, Kotsyubynsky 2, 58000 Chernivtsi, Ukraine.
Department of Electronics and Information Technology, Lublin University of Technology, Nadbystrzycka 38D, 20-618 Lublin, Poland.
Sensors (Basel). 2021 Sep 9;21(18):6029. doi: 10.3390/s21186029.
This paper presents a method for implementing the configuration structure of an integrated computational core of a pulsed nuclear quadrupole resonance (NQR) sensor based on a field-programmable gate array (FPGA), which comprises the following modules: a three-channel direct digital synthesizer (DDS), a pulse sequence shaper and a software-defined radio. Experimental studies carried out using the in-circuit analyzer SignalTap Logic Analyzer have confirmed the reliability of the correct and stable operation of the functional modules of the configuration structure at all stages of signal transformations, starting from the formation of the envelope of the excitation pulses and ending with the obtainment of low-frequency quadrature signals at the outlet of the compensating filters. The time and frequency dependences of the amplitude of the output signals generated using the DDS based on a 48 bit phase accumulator are investigated. This development can be used when creating pulsed coherent NQR sensors in the frequency range of 1 MHz-50 MHz.
本文提出了一种基于现场可编程门阵列（FPGA）实现脉冲核四极共振（NQR）传感器集成计算核心配置结构的方法，该结构包括以下模块：三通道直接数字频率合成器（DDS）、脉冲序列整形器和软件定义无线电。使用在线分析仪SignalTap Logic Analyzer进行的实验研究证实了配置结构功能模块在信号转换各阶段正确稳定运行的可靠性，从激励脉冲包络的形成到补偿滤波器输出端获得低频正交信号。研究了基于48位相位累加器的DDS生成的输出信号幅度的时间和频率依赖性。该开发成果可用于创建频率范围为1 MHz至50 MHz的脉冲相干NQR传感器。
