2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications最新文献_第3页

Influence of converse piezoelectric effects on the frequency properties of electron emission in PZT cathode 反向压电效应对PZT阴极电子发射频率特性的影响

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775760

Xue-mei Cai, Ying-hua Zhou

{"title":"Influence of converse piezoelectric effects on the frequency properties of electron emission in PZT cathode","authors":"Xue-mei Cai, Ying-hua Zhou","doi":"10.1109/SPAWDA.2008.4775760","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775760","url":null,"abstract":"The influence of converse piezoelectric effect on the frequency of PZT cathode during the electron emission process was studied. The PZT cathodes were prepared by ordinary ceramic process and the diameter of PZT cathode is 25 mm as well as the thickness is 3 mm. The back electrode, whose diameter is 20 mm, and the grid electrodes, with intervals being 200 mum, were made of gold by using evaporation technology. The experimental setups include a high voltage pulse generator, vacuum chamber, oscilloscope and voltage divider. Several periodic peaks of emitted electron current were observed and the period is 180 ns. The prominent frequency of the waveforms is about 5.8 MHz, obtained from the frequency spectrum of the current waveforms. This value is close to the surface vibrating frequency of 6.6 MHz, calculated through the theories of surface acoustic waves in PZT ceramics. That the frequency of the emitted electron current was modulated by the surface vibration can be concluded from the above results based on the theories of surface acoustic waves, fast polarization switch and surface plasma induced ferroelectric emission. Thus the several periodic peeks observed from the emitted current can be well explained.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129920358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of the existence of complete band gaps in periodic binary piezoelectric phononic crystals based on connectivity 基于连通性的周期性二元压电声子晶体完全带隙存在性分析

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775757

Z. Qian, F. Jin, K. Kishimoto, T. Lu

{"title":"Analysis of the existence of complete band gaps in periodic binary piezoelectric phononic crystals based on connectivity","authors":"Z. Qian, F. Jin, K. Kishimoto, T. Lu","doi":"10.1109/SPAWDA.2008.4775757","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775757","url":null,"abstract":"In this paper we analyze the existence of complete band gaps in periodic binary two-dimensional piezoelectric phononic crystals with {1-3} connectivity family from a point view of connectivity. For this structure and no wave-vector components parallel to the cylinders, there are two independent modes of vibration. One of them is the transverse polarization mode (Z mode) with the elastic displacement vector parallel to the cylinders. And the other one is the longitudinal-transverse polarization mode (XY mode) with the elastic displacement vector perpendicular to the cylinders. The plane-wave-expansion (PWE) method is applied to the theoretical derivation of secular equations of the two polarization modes. Band structures for the two modes are calculated to look for complete band gaps in piezoelectric phononic crystals with both 1-3 connectivity and 3-1 connectivity, which will be used to analyze the effect of connectivity on the existence of band gaps in piezoelectric phonic crystals. Numerical results reveal that the strong difference of physical properties between the constituents in piezoelectric phononic crystals can't dominate the existence of complete band gaps and the connectivity of the constituents plays an important role in the existence mechanism.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132386871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characteristic spectrum research in ae signals based on wavelet analysis 基于小波分析的声发射信号特征谱研究

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775827

Xiao-qing Yuan, Yi-kai Shi

引用次数: 4

The vibration sensor of metal core piezoelectric fiber 金属芯压电光纤振动传感器

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775858

Yixiang Bian, J. Qiu, Xin-wei Wang, H. Ji, K. Zhu

{"title":"The vibration sensor of metal core piezoelectric fiber","authors":"Yixiang Bian, J. Qiu, Xin-wei Wang, H. Ji, K. Zhu","doi":"10.1109/SPAWDA.2008.4775858","DOIUrl":"https://doi.org/10.1109/SPAWDA.2008.4775858","url":null,"abstract":"The metal core piezoelectric fiber (MPF) is one of the new typical sensors and actuators. The metal core is precisely located at the center of the fiber and surrounded by the ceramic. The metal core can be used as an electrode and the other electrode is coated on the outer surface of the fiber. When an external voltage is applied between the electrodes, the electric field is assumed to be in the radial direction of the fiber. Hence the direction of the polarization in the polarized ceramic is radial. Because two electric electrodes are available in each fiber, a single fiber can be used as a sensor or an actuator. When MPF is mounted on the surface of a cantilever beam, an axial strain will be generated on the fiber as a dynamic load is applied at the tip of the beam. And a dynamic electric charge will be generated on the electrodes of MPF because of the piezoelectric effect. Based on the piezoelectric constitutive equations, the mechanical model of the sensor is established. When the tip of cantilever beam subjected to a dynamic lateral force, the analytical expressions of the electric charges generated on the electrodes of MPF have been derived from the constitutive equations. The electric charges of the MPF with platinum core or wolfram core, and different metal core to fiber radius ratios were calculated, when the tip of cantilever beam subjected to a dynamic lateral force. The effects of the radius ratio on the electric charge of the MPF sensor are investigated based on the numerical results of these equations. The dynamic vibration sensing properties of MPF sensor were experimentally studied. The first mode natural frequencies of cantilever beam is obtained using MPF sensor. The results show that the sensor can give a high sensitivity for the vibration of cantilever beam.","PeriodicalId":190941,"journal":{"name":"2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126470249","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dispersion relations of SAW propagating under Al grating on 128°YX-LiNbO3 128°YX-LiNbO3上Al光栅下SAW传播的色散关系

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775744

Fangqian Xu, B. Jin

引用次数: 0

Structural and dielectric properties of cobalt-copper ferrite/barium-strontium titanate composites 钴铜铁氧体/钛酸钡锶复合材料的结构和介电性能

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775836

Jian-gong Wu, Q. Li, Hui Xin, Peng Wang, Yong Wang

引用次数: 0

Slection of wavelet fuction on denoise qulities of ultrasonic inspection signal 小波函数对超声检测信号去噪品质的选择

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775761

Weiwei Zhang, Hong-wei Ma, Zhi-hua Wang

引用次数: 0

Experimental study of acoustic emission characteristics of underwater concrete structures 水下混凝土结构声发射特性试验研究

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775787

A. Jiang, Ying-hua Zhao, Li-wei Zhang

引用次数: 7

Theoretical analyses of non-contact linear motors driven by surface acoustic waves 表面声波驱动非接触式直线电机的理论分析

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775824

Huan-huan Gu, Di Ma, Shu-Yi Zhang, Li-ping Cheng, X. Shui

引用次数: 2

Research on the response of piezoelectric ceramic fibers with metal core to Lamb waves 金属芯压电陶瓷纤维对兰姆波的响应研究

2008 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications Pub Date : 2008-12-01 DOI: 10.1109/SPAWDA.2008.4775857

Jian Liu, J. Qiu, Weijie Chang, Yixiang Bian, K. Zhu

引用次数: 0