IEEE Ultrasonics Symposium, 2005.最新文献_第7页

Analysis of wave propagation in phononic crystals with channel using the plane-wave expansion and supercell techniques 利用平面波扩展和超级单体技术分析声子晶体中有通道的波传播

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1602800

Zi-Gui Huang, Tsung-Tsong Wu

引用次数: 7

Investigation of precision sound velocity measurement methods as reference for ultrasonic gas flow meters 作为超声气体流量计参考的精密声速测量方法研究

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1603128

Petter Norli, P. Lunde, M. Vestrheim, Christian Michelsen

{"title":"Investigation of precision sound velocity measurement methods as reference for ultrasonic gas flow meters","authors":"Petter Norli, P. Lunde, M. Vestrheim, Christian Michelsen","doi":"10.1109/ULTSYM.2005.1603128","DOIUrl":"https://doi.org/10.1109/ULTSYM.2005.1603128","url":null,"abstract":"Ultrasonic gas flow meters for volumetric flow rate fiscal metering of natural gas (USMs) may possibly also be used for mass and energy flow rate measurement, partially based on velocity of sound (VOS) measurement. To establish the accuracy of the VOS measurements given by the USM, and for traceability purposes, an independent and high-accuracy VOS measurement cell may be used as reference. To include relevant effects of dispersion, the cell should preferably work in the operational frequency range of USMs, e.g. 100-200 kHz, with natural gas under high pressure. Three different transient methods are investigated, aiming to realize a VOS measurement cell, and they are seen to have several common experimental uncertainty sources. In the present work, a two-distance method is discussed in more detail as an example, and some results from measurements in an insulated chamber with air at 1 atm and ca. 25 ◦ C are presented. The relative expanded measurement uncertainty was estimated according to ISO guidelines to 282 ppm (95 % conf. level). One major source of measurement uncertainty was experienced to be small convection currents in the chamber. Without these, the expanded uncertainty would have been about 162 ppm. Such convection effects are expected to be strongly reduced in a properly designed measurement cell. The VOS measurement results were compared with predictions from a VOS model for standard air, including dispersion (J. Acoust. Soc. Amer. 93 (5), pp. 2510-2516, 1993), resulting in a mean deviation of -18 ppm with a two standard deviation spread in the data of 190 ppm over the temperature range.","PeriodicalId":302030,"journal":{"name":"IEEE Ultrasonics Symposium, 2005.","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131055784","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

Ultrasonic testing of the time evolution properties of oranges 橙子时间演化特性的超声检测

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1603144

F. Camarena, J. Martínez, M. Ardid, J. Ramis, V. Espinosa

引用次数: 1

Optimization of acoustic mirrors for solidly mounted BAW resonators 固体安装BAW谐振器声反射镜的优化

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1602861

Stefan Marksteiner, J. Kaitila, G. Fattinger, R. Aigner

{"title":"Optimization of acoustic mirrors for solidly mounted BAW resonators","authors":"Stefan Marksteiner, J. Kaitila, G. Fattinger, R. Aigner","doi":"10.1109/ULTSYM.2005.1602861","DOIUrl":"https://doi.org/10.1109/ULTSYM.2005.1602861","url":null,"abstract":"The overall performance of bulk acoustic wave (BAW) filters is dominated by the effective coupling coefficient and the quality factor of the constituting BAW resonators. Whereas the effective coupling coefficient and its dependency on the layer stack is quite accurately modeled with a simple one-dimensional acousto-electric model (e.g. Masonstransmission line model), the prediction and optimization of the resonators quality factor - particularly for solidly mounted resonators (SMR) - completely fails with this model: whereas a calculation of the acoustic reflectance of a standard quarter-wavelength mirror stack leads to theoretical Q-factors well above 10000, experimental SMR devices with this type of mirror show values of typically well below 1000. This discrepancy is commonly explained by either visco-elastic loss in the materials and/or laterally leaking waves leaving the active resonator area. However, we have found a new, far more important loss mechanism relating to shear waves generated in the device. These waves can be created by injection from the resonators border area as well as by reflection/refraction of longitudinal waves at non-perpendicular angle of incidence to a material interface. In this paper, a quantitative methodology for the optimization of the acoustic mirror layer stack will be proposed. The influence of the mirror structure on the trapping of both longitudinal and shear wave energy will be discussed based on this very simple approach. Trade-offs with respect to the other important device parameters, such as effective coupling coefficient, temperature coefficient of frequency (TCF) and purity of the electrical response, are analyzed. The usefulness of this approach for the optimization of resonator Q-values will be proven by experimental results demonstrating Q-factors of 1500 and higher.","PeriodicalId":302030,"journal":{"name":"IEEE Ultrasonics Symposium, 2005.","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131192117","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: 90

Effective substitution of aluminum for gallium in langasite-type crystals for a pressure sensor use at high temperature 在高温压力传感器中使用的langasite型晶体中铝有效替代镓

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1602915

H. Takeda, S. Tanaka, S. Izukawa, H. Shimizu, T. Nishida, T. Shiosaki

引用次数: 38

ZnO for thin film BAW devices 薄膜BAW器件用ZnO

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1603221

J. Molarius, A. Nurmela, T. Pensala, M. Ylilammi, A. Dommann

引用次数: 3

Electro-acoustic slip and gap waves in piezoelectric structures of general anisotropy 一般各向异性压电结构中的电声滑移波和间隙波

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1603231

A. Darinskii, M. Weihnacht

引用次数: 1

Imaging feedback of tissue liquefaction (histotripsy) in ultrasound surgery 超声手术中组织液化(组织切片)的成像反馈

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1603200

T. Hall, J. Fowlkes, C. Cain

{"title":"Imaging feedback of tissue liquefaction (histotripsy) in ultrasound surgery","authors":"T. Hall, J. Fowlkes, C. Cain","doi":"10.1109/ULTSYM.2005.1603200","DOIUrl":"https://doi.org/10.1109/ULTSYM.2005.1603200","url":null,"abstract":"High intensity pulsed ultrasound was used to disrupt liver tissue through cavitation while monitoring with 8 MHz ultrasound imaging. Application of 2000 pulses (sufficient to liquefy the target tissue) resulted in an average 22.4 dB reduction in speckle amplitude. This method may provide effective feedback in ultrasound surgery using cavitation. INTRODUCTION Previous work has shown that under certain conditions, high-intensity pulsed ultrasound can be used to liquefy tissue (1). We are exploring this method as an alternative and complement to traditional thermal therapy techniques. The process of tissue breakdown (we refer to as \"histotripsy\") is thought to occur as a result of repeated subdivision of tissue structure through cavitation. We hypothesize that cavitation induced liquefaction of tissue should produce a significant reduction in standard B-scan imaging speckle amplitude as tissue structure is broken down and the underlying source of speckle backscatter in the MHz regime is reduced. This may provide an effective feedback mechanism for treatment efficacy in ultrasound surgery using cavitation. METHODS Freshly harvested liver samples (less than 6 hours) were placed in degassed saline and then vacuum sealed in thin plastic bags. The samples were placed in the nominal focus of a 1 MHz 512 channel therapeutic array transducer (Imasonic, Besancon, FR). An 8 MHz linear imaging transducer (Siemens Elegra) was placed opposite to the therapeutic transducer very close to the liver sample in order to monitor ultrasound treatments (Fig. 1).","PeriodicalId":302030,"journal":{"name":"IEEE Ultrasonics Symposium, 2005.","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128815944","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: 23

Fourier based imaging method with steered plane waves and limited-diffraction array beams 基于傅立叶的定向平面波和有限衍射阵列光束成像方法

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1603263

Jiqi Cheng, Jian-yu Lu

引用次数: 12

Ultra-low power UWB communication system using SAW matched filters 超低功耗UWB通信系统采用SAW匹配滤波器

IEEE Ultrasonics Symposium, 2005. Pub Date : 2005-09-18 DOI: 10.1109/ULTSYM.2005.1602973

T. Sugiura, T. Sato, E. Otobe, K. Tanji, N. Otani, H. Nagasaka, M. Hasegawa, T. Shimamori

引用次数: 6