Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364479
Jun-cai Ding, Bin Wu, C. He
The description of the wave propagation in the multilayer adhesive structure under different forms of interfaces is very complex. For this issue, the reflection and transmission coefficient expressions of longitudinal and transverse waves with the dimensionless parameter of ωτ in the trilaminar plate-like adhesive structure are derived when the adhesive layer is assumed to be viscoelastic material with a relaxed time of τ. Aluminum-epoxy resin-polystyrene adhesive structure is taken as an example to analyze the impact of changes in the angle of incidence on acoustic wave reflection and transmission characteristics. Numerical results show that regardless of the value of ωτ, interface form can not be identified in the case of normal incidence or grazing incidence of longitudinal wave. In a particular products of frequency-thickness, if the angle of incidence is appropriate, the methods of reflection and transmission coefficients of longitudinal wave or transverse wave reflection coefficient can be adopted to detect the perfect, sliding and weak bonding interfaces. The results provide a theoretical basis for the experiment of the adhesive structure by means of ultrasonic testing.
{"title":"Longitudinal wave propagation in adhesive structure under different forms of interfaces","authors":"Jun-cai Ding, Bin Wu, C. He","doi":"10.1109/SPAWDA.2015.7364479","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364479","url":null,"abstract":"The description of the wave propagation in the multilayer adhesive structure under different forms of interfaces is very complex. For this issue, the reflection and transmission coefficient expressions of longitudinal and transverse waves with the dimensionless parameter of ωτ in the trilaminar plate-like adhesive structure are derived when the adhesive layer is assumed to be viscoelastic material with a relaxed time of τ. Aluminum-epoxy resin-polystyrene adhesive structure is taken as an example to analyze the impact of changes in the angle of incidence on acoustic wave reflection and transmission characteristics. Numerical results show that regardless of the value of ωτ, interface form can not be identified in the case of normal incidence or grazing incidence of longitudinal wave. In a particular products of frequency-thickness, if the angle of incidence is appropriate, the methods of reflection and transmission coefficients of longitudinal wave or transverse wave reflection coefficient can be adopted to detect the perfect, sliding and weak bonding interfaces. The results provide a theoretical basis for the experiment of the adhesive structure by means of ultrasonic testing.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122511709","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364500
Chong Wang, Zhao-bin Peng, Jie Mao, Guoxuan Lian
LVDS (low-voltage differential signaling) technology provides an attractive solution for fast data transmission which has low power consumption. An enhanced LVDS transmission protocol is developed in this paper for reliable high-speed board-to-board LVDS data transmission in rail flaw ultrasonic testing system. The protocol, which is based on 8B/10B encoding and dynamic time-delay adjustment, avoids the data missing in AC coupling transfer between boards and guarantees the accuracy of the high-speed acquisition in receiver. Experiment results show that the enhanced LVDS transmission protocol can achieve a reliable transmission up to 1.25Gbps between boards and satisfy the requirement of high-speed data transmission in rail flaw ultrasonic testing system. The LVDS protocol designed in this paper also provides an effective transfer method for the research of portable ultrasonic testing system.
{"title":"High-speed LVDS board-to-board data transmission based on 8B/10B encoding and dynamic time-delay adjustment in rail flaw ultrasonic testing system","authors":"Chong Wang, Zhao-bin Peng, Jie Mao, Guoxuan Lian","doi":"10.1109/SPAWDA.2015.7364500","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364500","url":null,"abstract":"LVDS (low-voltage differential signaling) technology provides an attractive solution for fast data transmission which has low power consumption. An enhanced LVDS transmission protocol is developed in this paper for reliable high-speed board-to-board LVDS data transmission in rail flaw ultrasonic testing system. The protocol, which is based on 8B/10B encoding and dynamic time-delay adjustment, avoids the data missing in AC coupling transfer between boards and guarantees the accuracy of the high-speed acquisition in receiver. Experiment results show that the enhanced LVDS transmission protocol can achieve a reliable transmission up to 1.25Gbps between boards and satisfy the requirement of high-speed data transmission in rail flaw ultrasonic testing system. The LVDS protocol designed in this paper also provides an effective transfer method for the research of portable ultrasonic testing system.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130754077","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364428
Xintao Zhao, Z. Qian, Bin Wang
This paper analyses free vibration frequencies and modes for thickness-shear and thickness-twist vibrations of centrally partially electroded circular AT-cut quartz plate by using 3-D finite element models of commercial package ANSYS. The analysis has been done with the 3-D Finite Element Analysis (FEA) for displacements and vibration frequency at the thickness-shear mode, which is important in the design of quartz crystal resonators. Trapped modes are found with vibrations mainly confined under the circular electrodes. The 3-D FEA solutions of displacement distribution can be used in the optimal selection of the structural parameters.
{"title":"Finite Element Analysis of centrally partially electroded circular AT-cut quartz plate","authors":"Xintao Zhao, Z. Qian, Bin Wang","doi":"10.1109/SPAWDA.2015.7364428","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364428","url":null,"abstract":"This paper analyses free vibration frequencies and modes for thickness-shear and thickness-twist vibrations of centrally partially electroded circular AT-cut quartz plate by using 3-D finite element models of commercial package ANSYS. The analysis has been done with the 3-D Finite Element Analysis (FEA) for displacements and vibration frequency at the thickness-shear mode, which is important in the design of quartz crystal resonators. Trapped modes are found with vibrations mainly confined under the circular electrodes. The 3-D FEA solutions of displacement distribution can be used in the optimal selection of the structural parameters.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127620005","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364538
Chunnan Zhou, Chang-hai Yang, M. Zhao, C. Fan
Based on the operator theory, the general solutions of the extended displacements and stresses in three-dimensional piezoelectric media are expressed in terms of two potential functions. By introducing the generalized Almansi's theorem and the Hankel transform, the obtained general solutions are further simplified and expressed by harmonic functions. Finally, the fundamental solutions of the extended displacements and stresses corresponding to unit concentrated extended displacement discontinuities are derived.
{"title":"A new method for the fundamental solution of displacement discontinuities in 3D piezoelectric media","authors":"Chunnan Zhou, Chang-hai Yang, M. Zhao, C. Fan","doi":"10.1109/SPAWDA.2015.7364538","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364538","url":null,"abstract":"Based on the operator theory, the general solutions of the extended displacements and stresses in three-dimensional piezoelectric media are expressed in terms of two potential functions. By introducing the generalized Almansi's theorem and the Hankel transform, the obtained general solutions are further simplified and expressed by harmonic functions. Finally, the fundamental solutions of the extended displacements and stresses corresponding to unit concentrated extended displacement discontinuities are derived.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132482625","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364477
Yongwei Liu, Qi Li, Huiling Sun, D. Shang, Jundong Sun
Wine has played an important role in people's daily lives. The method of accelerating the aging of wine by different ultrasonic wave is reported. A system has been built up. Three kinds of composite rod transducers are mounted at the bottom of three cylindrical steel barrel. The diameter of cylindrical steel barrel is 300 mm, 400 mm, and 500 mm, respectively. The resonant frequency of transducers is 25 kHz, 40 kHz, 60 kHz, respectively. The barrel is filled with water and the temperature of water is 20°C. The sound pressure level in the barrel is 170 dB, 180 dB, 200 dB, respectively. When sound pressure level is 200 dB, acoustic cavitation is observed. The wine, which is brewed by sorghum and wheat, is contained in five glass bottles, and considered to be one sample. Then, each sample is put into the barrel. The alcohol content in the wine is 70.0. At a certain sound pressure level, the working time is 5 minutes, 10 minutes, 20 minutes, respectively. In total, there are 27 samples of wine by the treatment of ultrasonic wave. Besides, an origin sample without ultrasonic wave treatment is selected as the comparison. The sound field distribution of the barrel is simulated by the software of VIRTUAL LAB. In the simulation, sound field distribution of the barrel is not uniform and each sample should be spatially averaged. The total acid, total ester, ethyl lactate, ethyl caproate, and alcohol content of each sample have been tested. The test period is 1 hour, 2 days, 4 days, 8 days, 30 days, respectively, after the process of ultrasonic wave treatment. The effect of ultrasonic wave on alcohol content, total acid, total ester, ethyl lactate, ethyl caproate has been discussed.
{"title":"The investigation on accelerating the aging of wine by ultrasonic wave","authors":"Yongwei Liu, Qi Li, Huiling Sun, D. Shang, Jundong Sun","doi":"10.1109/SPAWDA.2015.7364477","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364477","url":null,"abstract":"Wine has played an important role in people's daily lives. The method of accelerating the aging of wine by different ultrasonic wave is reported. A system has been built up. Three kinds of composite rod transducers are mounted at the bottom of three cylindrical steel barrel. The diameter of cylindrical steel barrel is 300 mm, 400 mm, and 500 mm, respectively. The resonant frequency of transducers is 25 kHz, 40 kHz, 60 kHz, respectively. The barrel is filled with water and the temperature of water is 20°C. The sound pressure level in the barrel is 170 dB, 180 dB, 200 dB, respectively. When sound pressure level is 200 dB, acoustic cavitation is observed. The wine, which is brewed by sorghum and wheat, is contained in five glass bottles, and considered to be one sample. Then, each sample is put into the barrel. The alcohol content in the wine is 70.0. At a certain sound pressure level, the working time is 5 minutes, 10 minutes, 20 minutes, respectively. In total, there are 27 samples of wine by the treatment of ultrasonic wave. Besides, an origin sample without ultrasonic wave treatment is selected as the comparison. The sound field distribution of the barrel is simulated by the software of VIRTUAL LAB. In the simulation, sound field distribution of the barrel is not uniform and each sample should be spatially averaged. The total acid, total ester, ethyl lactate, ethyl caproate, and alcohol content of each sample have been tested. The test period is 1 hour, 2 days, 4 days, 8 days, 30 days, respectively, after the process of ultrasonic wave treatment. The effect of ultrasonic wave on alcohol content, total acid, total ester, ethyl lactate, ethyl caproate has been discussed.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133016984","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364427
F. Zhu, Yu-xing Zhang, Bin Wang, Z. Qian
In this paper, the piezoelectric film, electrodes and the silicon substrate of FBARs are modeled as a layered sandwich structure for studying the wave propagation in it. The harmonic solutions should satisfy the governing equations of each layer. Then, the dispersion relations can be obtained by the continuity conditions and boundary conditions. The dispersion curves are compared with the results when the electrodes are treated as inertia layers for model simplification. As a conclusion, the simplification usually used in dealing with quartz resonator will lead to an unacceptable error due to a big mass ratio of FBARs. Further, the vibration modes of the curves are discussed.
{"title":"Plane wave propagation in layered piezoelectric film resonators","authors":"F. Zhu, Yu-xing Zhang, Bin Wang, Z. Qian","doi":"10.1109/SPAWDA.2015.7364427","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364427","url":null,"abstract":"In this paper, the piezoelectric film, electrodes and the silicon substrate of FBARs are modeled as a layered sandwich structure for studying the wave propagation in it. The harmonic solutions should satisfy the governing equations of each layer. Then, the dispersion relations can be obtained by the continuity conditions and boundary conditions. The dispersion curves are compared with the results when the electrodes are treated as inertia layers for model simplification. As a conclusion, the simplification usually used in dealing with quartz resonator will lead to an unacceptable error due to a big mass ratio of FBARs. Further, the vibration modes of the curves are discussed.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125300914","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364457
Hai-lang He, Yun Wang
In order to understand the electro-mechanical characteristics of the piezoelectric sensor in weigh-in-motion system and theoretically support the data post-processing, this paper established a 3D solid finite element model of beam type piezoelectric sensor of a weigh-in-motion system, which was embedded in the road. The vehicles ware simulated as moving concentrated load. The signals of the output voltage of the piezoelectric sensor were then obtained in different speed and weight of vehicles. The results showed that the output signal of the piezoelectric sensor could be used to extract the effective information of the axle-weight and speed of the vehicle.
{"title":"Simulation of piezoelectric sensor in weigh-in-motion systems","authors":"Hai-lang He, Yun Wang","doi":"10.1109/SPAWDA.2015.7364457","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364457","url":null,"abstract":"In order to understand the electro-mechanical characteristics of the piezoelectric sensor in weigh-in-motion system and theoretically support the data post-processing, this paper established a 3D solid finite element model of beam type piezoelectric sensor of a weigh-in-motion system, which was embedded in the road. The vehicles ware simulated as moving concentrated load. The signals of the output voltage of the piezoelectric sensor were then obtained in different speed and weight of vehicles. The results showed that the output signal of the piezoelectric sensor could be used to extract the effective information of the axle-weight and speed of the vehicle.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125763202","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364545
S. Sanna
Small bound polarons and bipolarons in lithium niobate are investigated in the framework of the density functional theory. The LDA+U method is employed to account for the strong correlation of the electronic states in the Nb 4d orbitals. Charge distributions as well as structural and electronic properties are discussed depending on the charge state. The NbLi5+ antisite is found to introduce a localized level within the LiNbO3 fundamental gap that is almost resonant with the conduction band edge. This level can be occupied either by a one or by two electrons. In the latter case, a major rearrangement of the atomic position occurs, and a covalent bond along the rhombohedral [111] direction between the antisite NbLi and a Nb at a regular lattice site is formed.
{"title":"Bound electron polarons in lithium niobate","authors":"S. Sanna","doi":"10.1109/SPAWDA.2015.7364545","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364545","url":null,"abstract":"Small bound polarons and bipolarons in lithium niobate are investigated in the framework of the density functional theory. The LDA+U method is employed to account for the strong correlation of the electronic states in the Nb 4d orbitals. Charge distributions as well as structural and electronic properties are discussed depending on the charge state. The NbLi5+ antisite is found to introduce a localized level within the LiNbO3 fundamental gap that is almost resonant with the conduction band edge. This level can be occupied either by a one or by two electrons. In the latter case, a major rearrangement of the atomic position occurs, and a covalent bond along the rhombohedral [111] direction between the antisite NbLi and a Nb at a regular lattice site is formed.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130829038","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364529
Ben-jie Ding, Jianke Du, J. Lou, Ji Wang, T. Ma, Bin Huang, Lijun Yi
In this paper, the electromagnetic energy harvesting scheme by using a Terfenol-D/PZT/Terfenol-D composite magnetoelectric (ME) transducer and a circuit is presented. In the experiments, the electrodes on the piezoelectric layer are connected by a circuit whose impedance is denoted by Z, which is the load impedance. we have analyzed and observed the load dependence of the ME coefficient and the basic behaviors of the power density. A giant sharp ME coefficient αE a of 24.5 mv/Oe appears at 3.72×105 rad/s under the load impedance Z of 2000Ω.
{"title":"Experimental study on extensional vibration of a piezoelectric/piezomagnetic laminated plate","authors":"Ben-jie Ding, Jianke Du, J. Lou, Ji Wang, T. Ma, Bin Huang, Lijun Yi","doi":"10.1109/SPAWDA.2015.7364529","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364529","url":null,"abstract":"In this paper, the electromagnetic energy harvesting scheme by using a Terfenol-D/PZT/Terfenol-D composite magnetoelectric (ME) transducer and a circuit is presented. In the experiments, the electrodes on the piezoelectric layer are connected by a circuit whose impedance is denoted by Z, which is the load impedance. we have analyzed and observed the load dependence of the ME coefficient and the basic behaviors of the power density. A giant sharp ME coefficient αE a of 24.5 mv/Oe appears at 3.72×105 rad/s under the load impedance Z of 2000Ω.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134295975","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}
Pub Date : 2015-12-28DOI: 10.1109/SPAWDA.2015.7364542
Ce Yuan, Hong-lang Li, Yahui Tian, Yabing Ke
This paper has analyzed the relationship between the distribution of displacement vectors and the properties of corresponding line defect waveguide within the band gaps of PCs. In order to obtain the band gaps of PCs, a delay line model was built. Through simulating this model by finite element method, the displacement vectors in PCs also can be obtained. To analyze the properties of corresponding line defect waveguide, the model of line defect waveguide has been built and calculated. With this method, a PCs consisting of 128°YX lithium niobate matrix with cylindrical hole from a square lattice is analyzed. The results show that the SAW displacement vector in the propagation direction decrease slowly and the SAW displacement vector in the transverse direction is large relatively, it will have a good property of line defect waveguide.
{"title":"Analysis of the relationship between the properties of line defect waveguide and the distribution of displacement vector within band gaps of the phononic crystal","authors":"Ce Yuan, Hong-lang Li, Yahui Tian, Yabing Ke","doi":"10.1109/SPAWDA.2015.7364542","DOIUrl":"https://doi.org/10.1109/SPAWDA.2015.7364542","url":null,"abstract":"This paper has analyzed the relationship between the distribution of displacement vectors and the properties of corresponding line defect waveguide within the band gaps of PCs. In order to obtain the band gaps of PCs, a delay line model was built. Through simulating this model by finite element method, the displacement vectors in PCs also can be obtained. To analyze the properties of corresponding line defect waveguide, the model of line defect waveguide has been built and calculated. With this method, a PCs consisting of 128°YX lithium niobate matrix with cylindrical hole from a square lattice is analyzed. The results show that the SAW displacement vector in the propagation direction decrease slowly and the SAW displacement vector in the transverse direction is large relatively, it will have a good property of line defect waveguide.","PeriodicalId":205914,"journal":{"name":"2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133465335","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}
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