Research On Acceleration Sensor Based On New Structure Cymbal Piezoelectric Transducer

Because of its special structure, the piezoelectric transducer with the cymbal structure shows the number of times higher than the typical structure piezoelectric transducer on piezoelectric performance. Since it was proposed, the cymbal piezoelectric transducer has been the research focus of piezoelectric composite transducers, and applied to hydrophones, energy harvest devices, medical equipments and other fields. In original cymbal piezoelectric transducer, the piezoelectric material and the metal end-cap are fixedly connected only by adhesive,so that it causes the adhesive layer failure under cyclic loading or large displacement, which made an impact on its performance, and application scope is limited. In this paper, components of the new structure cymbal piezoelectric transducer are not only fixedly connected by adhesive, but also connected by bolts to improve its fatigue strength, so that it can withstand higher excitation voltage and output larger displacement. The improved design broadens applications range of the cymbal piezoelectric transducer, bring the good application value and prospects.Based on the theoretical analysis and finite element analysis of the cymbal transducer structure, displacement-voltage mathematical model of the transducer is given and verified, and the sensitivity and equivalent piezoelectric constant mathematical expression are derived, and the relationship between transducer structure parameters and its performance is analyzed to illustrate the advantages of the new structure cymbal piezoelectric transducer compared to the original design. According to the theoretical analysis and finite element analysis results, structure parameters of the new structure cymbal piezoelectric transducer are determined, its manufacture process being researched, and the transducer sample is produced. The charge amplifier and low pass filter are designed to realize the impedance conversion of the transducer output signal and basically filter out high-frequency interference signals, and the PCB is designed and produced. At last, the acceleration sensor is designed and produced based on the new structure cymbal piezoelectric transducer.The cymbal piezoelectric transducer and cymbal piezoelectric acceleration sensor are experimentally researched. Comparative experiments between the cymbal piezoelectric transducer and piezoelectric ceramic are conducted, and the impact of the mass on transducer performances is experimentally researched. The influence of the charge amplifier feedback resistor on output signals is researched, and cymbal piezoelectric accelerometer performances are tested to give the relevant static performance indices.Experimental results show that the voltage sensitivity of the acceleration sensor based on cymbal transducer is about 40 times higher than the traditional acceleration sensor based on piezoelectric ceramic. In this paper, some relevant static performance indices of the designed cymbal piezoelectric acceleration is given, which is sensitivity 22.185mV/m?s-2, linearity 1.611%, hysteresis 0.304%, repeatability 0.455%.