Research on compensation of low frequency response of piezoelectric dynamic strain measurement system
Ming Da Zhu · Journal of Transducer Technology · 2005
A digital filtering method is proposed for compensation of the low frequency characteristics of piezoelectric dynamic strain measurement system.By dynamic calibration of the sensor,the step response of the measuring system is obtained.A digital compensation filter is then designed based on the step response by using the system identification toolbox in Matlab environment.Results show that the digital filter can well compensate the low frequency distortion in the measured waveform,and the low cut-off frequency is reduced from 2.2 Hz to less than 10~(-3) Hz.