扩展压电传感器频率响应范围的方法研究

为了进一步提高压电传感器及其信号调理电路的低频响应能力，扩展压电传感器的工作频带，通过分析压电传感器电荷放大电路的频率响应情况，提出了采用数字滤波器进行补偿的方法。利用对压电传感器标定后获得的输入输出和MATLAB软件设计了FIR滤波器，并将传感器测试系统与滤波器串联来复现原有被测信号。仿真结果表明该方法使压电测量系统的工作带宽得以扩展，进一步降低了整个压电测量系统的低频截止频率，达到了减小动态测量误差的目的。

Study on the method to extend frequency response of piezoelectric sensors

In order to improve furtherly the low frequency response ability of the piezoelectric sensor and its signal conditioning circuit and extend the frequency of piezoelectric sensors, through the analysis of the frequency response of the charge amplifier circuit of the piezoelectric sensor,a method for compensation with a digital filter is proposed . Using the piezoelectric sensor calibration for input and output and matlab software,a FIR filter is designed. Through the sensor testing system with the filter in series, the original measured signal is reproduced. The simulation results show that the method makes the working bandwidth of the measurement system expand and the low frequency cutoff frequency of the piezoelectric measuring system is reduced furtherly,the goal to reduce the dynamic measurement error is achieved.