Y6DL-3型动态电阻应变仪小信号的测量研究

he type of AC(Alternating Current) bridge and carrier amplification were used in Y6DL-3 dynamic resistance strain gauge. The carrier signal was not filtered out by the π type filter in the dynamic resistance strain gauge completely. The measurement of small-signal would be affected by the carrier signal . In view of the above practical situation, a Butterworth low-pass active filter was designed based on the Filterlab2.0 software in this text. Then it was made and applied in the dynamic resistance strain gauge. The results show that: The carrier signal can be restrained and the signal-to-noise can be enhanced by the filter effectively.The effect of filtering is very good.This text offers an effective method for the solution of the signal disturb problems in similar instruments .