摘要
针对线圈式磁传感器随测量转速变化所产生的电动势信号幅值线性变化的问题,为实现此类幅值与周期动态变化信号的无失真采集,设计了一种增益随输入信号幅值水平改变的自适应增益采集系统;本系统以现场可编程门阵列(FPGA)为控制核心,对输入信号幅值进行分析,根据幅值分析结果控制电路增益在-20~80 dB范围内自适应改变,并记录系统当前时刻增益,根据当前增益还原得到输入信号,将增益信号和还原信号同步存储;采集信号经自适应增益后输出信号幅值控制在设定范围内,利于对动态信号中不同幅值区间信号变化细节直接观察;通过幅值在20μV~10 V范围内转速信号输入测试,系统自适应增益后信号幅值控制在了0.1~4 V范围内,实现了对动态转速信号的无失真采集,验证了本自适应增益采集电路的性能,在高动态幅值信号采集领域,具有良好的应用前景。
Aimed at the linear variation in the amplitude of the electromotive force signal generated by the coil magnetic sensors with the change of measuring speed,in order to realize the distortion-free acquisition of such amplitude and periodic dynamic change signals,this paper proposes an adaptive gain acquisition system with gain varying with input signal amplitude.The system takes field programmable gate array(FPGA)as a control core,analyzes the input signal amplitude,and adaptively controls the circuit gain within the range of-20~80 dB according to the amplitude analysis result,records the current gain of the system,restores the input signal according to the current gain,and synchronously stores the gain signal and restore signal.The collected output signal amplitude with adaptive gain is controlled within the set range,the signal change details are directly observed in different amplitude ranges of dynamic signal.Through the speed signal input test within the range of 20μV~10 V,the signal amplitude of the system with the adaptive gain is controlled within the range of 0.1~4 V,which achieves the dynamic speed signal without distortion and verifies the performance of the adaptive gain acquisition circuit.It has a good application prospect in dynamic signal acquisition field with high amplitude.
作者
张永杰
马林
董浩森
康良伟
边瑞卿
李凯
ZHANG Yongjie;MA Lin;DONG Haosen;KANG Liangwei;BIAN Ruiqing;LI Kai(Shanxi Provincial Key Laboratory of Information Detection and Processing,North University of China,Taiyuan 030051,China;China weapon Industry Test and Research Institute,Huayin 714200,China)
出处
《计算机测量与控制》
2024年第3期218-224,231,共8页
Computer Measurement &Control
基金
中央引导地方科技发展资金(YDZJSX20231A025)
山西重点研发计划项目(202202010101007)
山西省科技成果转化引导专项(202204021301044)
山西省基础研究计划(20210302123058)。
关键词
动生电动势
测速
FPGA
自适应增益
信号采集系统
motional electromotive force
speed measurement
FPGA
adaptive gain
signal acquisition system
