直线时栅位移传感器正交激励信号源设计（英文）

Quadrature exciting signal sources for a linear time grating sensors

时栅激励信号质量直接影响时栅磁场运动匀速性,进而决定时栅位移测量精度,因而研究高精度时栅激励信号源对于提高时栅传感器测量精度具有重要意义。针对直线时栅传感器对正交激励信号高质量的要求,采用直接频率合成技术设计满足要求的正交激励信号源。并且设计了一种有源带通滤波器用来消除干扰,提高信号质量。设计的正交激励信号具有幅值和频率可任意调节,并且具有精度较高,设计简单方便的特点。通过FPGA芯片将时栅传感器激励信号源与信号处理电路的一体化设计,最大限度地缩小时栅信号处理电路体积,并提高工作可靠性。仿真和实验结果证明了设计的有效性。这种设计方法可广泛应用于许多需要高质量激励信号的应用场合。

The uniform speed of the magnetic field is directly influenced by the quality of the exciting signals for time grating sensors,which determines the measurement accuracy of the time grating sensors.Therefore,the highquality exciting signals are of great significance to the measurement accuracy improvement of the time grating sensors.Regarding the high requirements on quadrature exciting signal sources for linear time grating sensors,a direct digital frequency synthesis technique is employed to design the quadrature exciting signals.In addition,an active band-pass filter is designed to eliminate the interference and improve the signal quality.The frequency and the phase of the proposed quadrature exciting signal sources can easily adjust,and the precision of the signals is high.The exciting signal sources and the signal processing circuits are integrated into one FPGA chip,which greatly decrease the size of the circuit board and improve the reliability.Simulation and experiment results prove the validity.This design method can be widely applied into many applications which require high quality of exciting signal sources.