基于FPGA的便携式正交锁相放大器研制
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摘要
基于FPGA研制了一种用于微弱信号检测的便携式正交锁相放大器。先由信号处理模块接收待测信号并对其进行可变增益放大与工频噪声滤波,经过A/D转换模块转换后输入FPGA,通过数字锁相环完成对待测信号的相位锁定,提取反馈信号以计算待测信号幅度,实现微弱信号检测。该锁相放大器的幅度测量范围为100 nV~100μV、动态范围达60 dB,相位精度达0.001°。该系统设计为便携式设备,成本低,易维护,可满足野外作业等特殊环境的测量要求,具有广阔的应用前景。
A portable orthogonal phase-locked amplifier for weak signal detection has been developed based on FPGA. First, the signal processing module receives the signal, does variable gain amplification on the signal and puts it through the power frequency noise filtering. The signal is put into the FPGA through A/D conversion module conversion. By the digital phase-locked loop, the amplifier completes the measured signal phase lock, extracts the feedback signal to calculate the measured signal amplitude, and completes weak signal detection. The lock-in amplifier amplitude measurement range is 100 nV ~ 100 μV, dynamic range can reach up to 60 dB, phase accuracy can attain 0. 001 °. The system is designed as a portable device, low cost, easy to maintain, can meet the measurement requirements of the special environment such as fieldwork or etc, and has broad application prospects.
A portable orthogonal phase-locked amplifier for weak signal detection has been developed based on FPGA. First, the signal processing module receives the signal, does variable gain amplification on the signal and puts it through the power frequency noise filtering. The signal is put into the FPGA through A/D conversion module conversion. By the digital phase-locked loop, the amplifier completes the measured signal phase lock, extracts the feedback signal to calculate the measured signal amplitude, and completes weak signal detection. The lock-in amplifier amplitude measurement range is 100 nV ~ 100 μV, dynamic range can reach up to 60 dB, phase accuracy can attain 0. 001 °. The system is designed as a portable device, low cost, easy to maintain, can meet the measurement requirements of the special environment such as fieldwork or etc, and has broad application prospects.
引文
[1]赵俊杰,郝育闻,郭璐璐,等.数字锁相放大器的实现研究[J].现代电子技术,2012,35(3):191-198.
[2]康跃腾,胡晓娅,汪秉文.基于锁相放大原理的微弱信号检测电路[J].电子设计工程,2013,21(6):162-164.
[3]陈希.基于AD630锁相放大器的研究设计及其在光纤气体传感检测系统中的应用[D].济南:山东大学,2017.
[4]许文佳.基于FPGA的数字锁相放大器的设计与研究[D].长春:吉林大学,2012.
[5]朱晓莉,厉霞.基于AD630的双相锁相放大器设计[J].机电工程技术,2012,42(6):19-23.
[6]赵婷婷,王先全,姜增晖,等.基于数字锁相放大的时栅传感器信号处理研究[J].工具技术,2017,51(4):87-92.
[7]苏鑫,罗文广,马超.一种双相位锁相放大电路设计[J].电子科技,2012,25(3):75-81.
[8]蔡满军,于彬,赵晓东.基于正交锁相放大器的微弱应变信号检测系统[J].仪表技术与传感器,2017(4):67-72.
[9]蒋碧波,杨振国,杨越.基于锁定放大器的微弱信号检测系统设计[J].科技经济市场,2017(4):1-2.
[2]康跃腾,胡晓娅,汪秉文.基于锁相放大原理的微弱信号检测电路[J].电子设计工程,2013,21(6):162-164.
[3]陈希.基于AD630锁相放大器的研究设计及其在光纤气体传感检测系统中的应用[D].济南:山东大学,2017.
[4]许文佳.基于FPGA的数字锁相放大器的设计与研究[D].长春:吉林大学,2012.
[5]朱晓莉,厉霞.基于AD630的双相锁相放大器设计[J].机电工程技术,2012,42(6):19-23.
[6]赵婷婷,王先全,姜增晖,等.基于数字锁相放大的时栅传感器信号处理研究[J].工具技术,2017,51(4):87-92.
[7]苏鑫,罗文广,马超.一种双相位锁相放大电路设计[J].电子科技,2012,25(3):75-81.
[8]蔡满军,于彬,赵晓东.基于正交锁相放大器的微弱应变信号检测系统[J].仪表技术与传感器,2017(4):67-72.
[9]蒋碧波,杨振国,杨越.基于锁定放大器的微弱信号检测系统设计[J].科技经济市场,2017(4):1-2.