PZT Ceramic Material Research And Cell Structure Simulation Of Pyroelectric Detector

As a detection device,pyroelectric detector is often used in wireless sensor network and other aspects as a collector,alarm and other sensor nodes because of its low cost,high reliability and no need of refrigeration.With the arrival and development of 5G network era with higher frequency transmission speed,lower cost,larger network scale architecture and higher security,it makes The interconnection of everything will be possible,which means that the scale of wireless sensor network will be expanded infinitely.At the same time,the demand of detectors as sensor nodes will be multiplied.However,there are two sides of things.Opportunities and challenges often appear in pairs.Therefore,how to improve the detection performance of pyroelectric detectors is an urgent topic to be studied,and the combination of detectors According to the structure and working principle,to improve the detection performance,the key point is to study the pyroelectric materials,device structure,heating mode and other issues.In this paper,the zirconium rich PMN-PMS-PZT ceramic material is used as the preparation material of the sensitive element.The influence of doping on its phase structure and dielectric properties is studied,and the unit structure of the detector is simulated and optimized.The first part is the preparation of PMN-PMS-PZT ceramics and the influence of doping on the characterization of ceramics.Firstly,the traditional solid-state sintering method was used to prepare PMN-PMS-PZT ceramics with Zr/Ti ratio of 95/5,90/10,85/15 and 82.5/17.5,respectively.The sintering and dielectric properties were compared.The experimental results show that with the increase of Zr Ti ratio,the ceramic materials have the situation of higher sintering temperature and narrower sintering temperature zone.Compared with 85/15 and 82.5/17.5,they perform better in this respect,and 85/15 of them have better dielectric properties,and the related literature has less research on 85/15 of Zr Ti ratio,so the PMN-PMS-PZT ceramics with 85/15 of Zr Ti ratio is selected finally It is the main formulation of pyroelectric sensitive element,but its dielectric property is not very ideal,so the purpose of modification is realized by doping,and the influence of doping Al ion and increasing Mn content on the structure and dielectric property of ceramics is studied.The experimental results show that the doped Al ions do not introduce new phase to the ceramic materials,and the dielectric properties are the best when the content of Mn ion is 0.08wt% on the basis of 0.3wt% Al ion doping.In the second part,the element structure is simulated and optimized.Firstly,SolidWorks software is used to build the three-dimensional model between the sensitive element and the supporting structure,and then ANSYS software is used to simulate the thermal and mechanical analysis of the model,and then the calculation results are used as the basis to further optimize the design model.The experimental results show that the larger the contact area between the support structure and the sensitive element,the slower the instantaneous temperature rise of the sensitive element surface,on the contrary,the faster the temperature rise,but the mechanical deformation is just the opposite.Therefore,it is very difficult to achieve fast instantaneous temperature rise and small shape variables of the sensitive element at the same time.Therefore,a six column support structure is designed to make the sensitive element perform best in both thermal and mechanical aspects.To sum up,on the basis of 0.3wt%Al ion doped 85/15 PMN-PMS-PZT ceramic material,adding Mn content can obtain pyroelectric ceramic material with better dielectric property,which is suitable for being used as a sensitive element in pyroelectric detector;adding a rectangular support structure in the middle part of the long side of the sensitive element can effectively improve the instantaneous temperature rise of the sensitive element and reduce the mechanics of the sensitive element Deformation,which has reference value for improving the overall performance of the detector,has potential research significance for its good application in wireless sensor network.