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Characteristics of a noncontact ultrasonic motor using acoustic levitation 采用声悬浮的非接触式超声电机的特性
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583995
J. Hu, K. Nakamura, S. Ueha
{"title":"Characteristics of a noncontact ultrasonic motor using acoustic levitation","authors":"J. Hu, K. Nakamura, S. Ueha","doi":"10.1109/ULTSYM.1996.583995","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583995","url":null,"abstract":"This paper presents the experimental and theoretical considerations on characteristics of a noncontact ultrasonic motor with an acoustically levitated rotor. The results can be used to optimize the motor design. It is shown that a linear relation between the revolution speed and the stator vibration velocity exists. The revolution speed can be increased by utilizing the resonance of the air gap between the stator and the rotor, by increasing the mode number of stator vibration, by narrowing the gap, and decreasing the stator inner diameter. The miniaturization of the motor is tried, and a maximum revolution speed of 1000 r.p.m. is observed for the motor of stator inner diameter of 6.0 mm. From the transient characteristics, it is known that the rise time of revolution can be shorten by using the same methods as increasing the revolution speed. Finally, the effect of the stator vibration velocity on the rotor stability is investigated.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122516118","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: 15
Design of generalized SPUDT filters 广义SPUDT滤波器的设计
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583951
C. Ruppel, R. Dill, J. Franz, S. Kurp, W. Ruile
{"title":"Design of generalized SPUDT filters","authors":"C. Ruppel, R. Dill, J. Franz, S. Kurp, W. Ruile","doi":"10.1109/ULTSYM.1996.583951","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583951","url":null,"abstract":"Single phase unidirectional transducer (SPUDTs) exhibit excellent frequency characteristics and are used in many surface acoustic wave (SAW) filters for IF filtering in mobile communication systems. They allow the design of narrow-band low-loss filters with smooth amplitude response. In the classical type of SPUDT filters the mechanical reflections are used to cancel the electrical regeneration. Thus the impulse response is close to the one calculated using the impulse model. In this limit has been overcome for the first time. Resonances in the transducers, or between the transducers, respectively, are used for improving the performance of a SPUDT filter for a given chip size. In this paper a general approach for the design of transducers including reflections will be outlined and the correlation to already well known SAW structures, e.g., inline resonator filters, will be figured out. A classification of the different types of generalized SPUDT based SAW filters will be given.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131486625","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: 21
Production trimming of SAW devices using CF/sub 4/ chemistry and its effects on SAW characteristics 利用CF/sub /化学对SAW器件进行生产修整及其对SAW特性的影响
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583969
R. Subramanian, J. Welter, P. Wright
{"title":"Production trimming of SAW devices using CF/sub 4/ chemistry and its effects on SAW characteristics","authors":"R. Subramanian, J. Welter, P. Wright","doi":"10.1109/ULTSYM.1996.583969","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583969","url":null,"abstract":"This paper presents a method of precise frequency trimming of Surface Acoustic Wave (SAW) devices using Reactive Ion Etching (RIE). The SAW devices are fabricated on quartz wafers and trimmed down in frequency by removing part of the quartz substrate between the electrodes, thus achieving the specified center frequency. A controlled frequency shift in the range of 10 kHz to 400 kHz is demonstrated. It has been observed that quartz etch rates of <100 /spl Aring//min. can be controlled, resulting in very low frequency shifts. Also, presealed hybrid and surface mount parts have been successfully trimmed to achieve a desired center frequency. Various parameters and test results are presented with no significant change in insertion loss or bandwidth observed. This method is simple and cost effective in high-volume SAW device production. Finally, a viable low-cost, high-volume production method of SAW device fabrication using this trimming process is demonstrated.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131596434","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: 2
Reduced passband ladder type SAW impedance element filters on strong piezoelectric substrates 强压电基板上的低通带阶梯型SAW阻抗元件滤波器
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583770
V. Plessky, S. Kondratiev, C. Lambert
{"title":"Reduced passband ladder type SAW impedance element filters on strong piezoelectric substrates","authors":"V. Plessky, S. Kondratiev, C. Lambert","doi":"10.1109/ULTSYM.1996.583770","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583770","url":null,"abstract":"Two ways of reducing coupling coefficient for 36-LiTaO/sub 3/ substrates are discussed: (1) a transducer with dummy electrodes and (2) an SiO/sub 2/ sublayer between the electrodes and the substrate. A theoretical coupling of modes (COM) model is used to find conditions for a twofold decrease of coupling. Experiments are made with test resonator-type structures for extraction of COM parameters and the obtained data are used for SAW duplexer design.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116502849","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: 4
Phantoms for elastography 弹性照相的幻影
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584204
T. Hall, M. Bilgen, M. Insana, P. Chaturvedi
{"title":"Phantoms for elastography","authors":"T. Hall, M. Bilgen, M. Insana, P. Chaturvedi","doi":"10.1109/ULTSYM.1996.584204","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584204","url":null,"abstract":"Several viscoelastic properties of gelatin materials used in sonography and elastography phantoms are reported. Also reported is a device that was designed and built to make these measurements. Measurement precision with this device is typically within 1%. Finite element analysis was used to study boundary conditions and compressor size (compared to sample size) effects on the estimated elastic modulus. Results of these measurements indicate that gelatin gels are a good choice for elastography phantoms, but that the stiffness of these materials increases with time.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133175731","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: 14
Properties of contrast agents insonified at frequencies above 10 MHz 对比剂在频率大于10mhz时的特性
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584189
K. Morgan, P. Dayton, S. Klibanov, G. Brandenburger, S. Kaul, K. Wei, K. Ferrara
{"title":"Properties of contrast agents insonified at frequencies above 10 MHz","authors":"K. Morgan, P. Dayton, S. Klibanov, G. Brandenburger, S. Kaul, K. Wei, K. Ferrara","doi":"10.1109/ULTSYM.1996.584189","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584189","url":null,"abstract":"The authors compare the properties of contrast agents following insonation in the 3-7 MHz range with the properties observed at higher frequencies, in order to differentiate the properties associated with insonation near resonance. In addition, to map small blood vessels located in deeper tissues, such as those within the retina and within lymph nodes, contrast-enhanced imaging at high frequencies may be desirable. Increasing the echo intensity with a contrast agent may allow the use of a higher frequency transducer, and thus improve the spatial resolution of the vascular map. With these goals in mind, the authors explore the properties of ultrasonic echoes from contrast agents at 38 MHz and compare these properties to those at lower frequencies.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133226578","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: 13
Electronically variable time delay in ultrasonic Lamb wave delay lines 超声波兰姆波延迟线的电子可变延时
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584136
S. Joshi
{"title":"Electronically variable time delay in ultrasonic Lamb wave delay lines","authors":"S. Joshi","doi":"10.1109/ULTSYM.1996.584136","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584136","url":null,"abstract":"This paper is concerned with the effect of a biasing electric field on the propagation of ultrasonic Lamb waves in thin plates. The biasing field is applied parallel to the direction of substrate thickness. Since the plate is very thin, large values of electric field can be obtained with low bias voltages. Our experiments have utilized Lamb wave delay lines fabricated on a 2.5 /spl mu/m thick silicon nitride membrane. Preliminary results indicate that fractional time delay changes greater than 130 parts per million can be obtained with bias voltages less than 2 volts.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114420563","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: 5
Statistical analysis of split spectrum processing 分谱处理的统计分析
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.584073
Qi Tian, N. Bilgutay
{"title":"Statistical analysis of split spectrum processing","authors":"Qi Tian, N. Bilgutay","doi":"10.1109/ULTSYM.1996.584073","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.584073","url":null,"abstract":"This work provides a statistical analysis of Split Spectrum Processing (SSP) performance in detecting multiple targets. The investigation is performed under two conditions: (i) known a priori target spectra (i.e., center frequency and bandwidth) which, in turn, identifies the optimal spectral range for processing, and (ii) adaptively obtaining the processing frequencies using group delay moving entropy. The group delay moving entropy (GDME) method was introduced to select the optimal frequency regions for SSP when detecting multiple targets. The effectiveness of this technique is statistically demonstrated in this paper. The performance is measured in terms of Normalized Signal-to-Noise Ratio and probability of target detection. SSP with known target information yields a slightly higher probability of detection compared to SSP using GDME, while both cases achieve comparable SNR enhancement. SSP results were compared to the optimal bandpass filter performance and shown to be superior.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125359248","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: 6
The effect of the fabrication process in propagation and reflectivity in an IDT 制造工艺对IDT传输和反射率的影响
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583974
P. Ventura, P. Dufilié, S. Boret
{"title":"The effect of the fabrication process in propagation and reflectivity in an IDT","authors":"P. Ventura, P. Dufilié, S. Boret","doi":"10.1109/ULTSYM.1996.583974","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583974","url":null,"abstract":"Narrow band SAW bandpass filter design requires an accurate computation of phase velocity and strip reflectivity within the IDT. It is well known that the influence of the technological process on both key parameters can not be neglected. With the help of the recently developed numerical FEM BEM model it is now possible to characterize with an excellent accuracy the effects of the shape of the electrode (up to a few thousand nodes can be used to mesh the electrode). In this paper, using an isotropic chemical etching model, a comparison between chemical etching and liftoff processes as well as the influence of the overetching parameter for the 38/spl deg/ Y rotated quartz will be presented. Three kinds of frequency ranges are studied corresponding to four, three and two fingers per wavelength. We will also show that a simple phenomenological model can be used to explain most results. Comparisons between simulations and measurements for low loss filters built using both liftoff and chemical etching processes will be shown.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131866603","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: 8
Experimental study on the performance of dithered single-phase unidirectional transducers (DSPUDT) and their filter applications on ST-quartz and LiTaO/sub 3/ substrate materials 抖动单相单向换能器(DSPUDT)性能及其在st -石英和LiTaO/sub - 3/衬底材料上滤波应用的实验研究
1996 IEEE Ultrasonics Symposium. Proceedings Pub Date : 1996-11-03 DOI: 10.1109/ULTSYM.1996.583767
R. Chang, D. F. Thompson, P. Wright
{"title":"Experimental study on the performance of dithered single-phase unidirectional transducers (DSPUDT) and their filter applications on ST-quartz and LiTaO/sub 3/ substrate materials","authors":"R. Chang, D. F. Thompson, P. Wright","doi":"10.1109/ULTSYM.1996.583767","DOIUrl":"https://doi.org/10.1109/ULTSYM.1996.583767","url":null,"abstract":"In this paper we present experimental results of the different reflection and transduction characteristics for transducers that have sampling rates of 1/3/spl lambda/, 3/8/spl lambda/, 2/5/spl lambda/, 3/7/spl lambda/, 5/12/spl lambda/, and 5/14/spl lambda/. Directivity tests on the different structures built on quartz and LiTaO/sub 3/ were performed and compared. Wide band measurements of all transducers were taken as well. These measurements suggest the possibility of implementing a DSPUDT filter with mixed sampling rates in order to suppress unwanted spurious modes like group and bulk wave modes. As a result, a table with the best combinations of sampling rates for high frequency (above 550 MHz) and low frequency (below 550 MHz) DSPUDT filters on ST-quartz and Y112-LiTaO3 was generated. This table was used to implement a 916.5 MHz filter in ST-QUARTZ, and a 960 MHz and 350 MHz filter on Y112-LiTaO/sub 3/.","PeriodicalId":278111,"journal":{"name":"1996 IEEE Ultrasonics Symposium. Proceedings","volume":"153 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132114113","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: 1
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