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1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)最新文献

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Combination of ZnO film and quartz to realize large coupling factor and excellent temperature coefficient for SAW devices 将ZnO薄膜与石英结合,实现SAW器件的大耦合系数和优异的温度系数
M. Kadota
A good temperature coefficient of frequency (TCF) and an appropriate electromechanical coupling factor (k/sub s/) are required for applications of surface acoustic wave (SAW) devices requiring a specific bandwidth. An ST cut X propagation quartz substrate for Rayleigh SAW devices is known for its good TCF; however, its electromechanical coupling factor is as small as 0.0014 at k/sub s//sup 2/, so it is often unsuitable for applications of SAW devices requiring a specific bandwidth. Generally, most single crystals and thin films have a negative TCF. Only a few materials such as a quartz substrate having a specific cutting angle or a propagating direction and SiO/sub 2/ films have a positive TCF. Many investigations aimed at improving the TCF by depositing a SiO/sub 2/ film having a positive TCF on a substrate having a negative TCF have been reported on. However, since the absolute value of the TCF of such substrates is large, a relatively thick film of SiO/sub 2/ is required for compensation of its TCF. The author has theoretically and experimentally studied in detail the opposite combination, that is, the combination of a ZnO film having a negative TCF and a quartz substrate having an appropriate positive TCF, with selection of appropriate cutting and propagation angles of the substrate. As the result, the author could realize SAW substrates having an appropriate electromechanical coupling factor (k/sub s//sup 2/=0.011), a good TCF (/spl ap/Oppm//spl deg/C), and a zero power flow angle in structures of IDT/ZnO/quartz and IDT/ZnO/shorted-plane/quartz using an ST-cut 35/spl deg/X propagation quartz substrates (a 29/spl deg/45' rotated Y and a 42/spl deg/45' rotated Y plates 35/spl deg/X propagation quartz) for the first time.
对于需要特定带宽的表面声波(SAW)器件的应用,需要良好的频率温度系数(TCF)和适当的机电耦合系数(k/sub /s /)。瑞利SAW器件的ST切割X传播石英衬底以其良好的TCF而闻名;然而,它的机电耦合系数在k/sub //sup 2/时仅为0.0014,因此通常不适合需要特定带宽的SAW器件的应用。一般来说,大多数单晶和薄膜具有负的TCF。只有少数材料,如石英衬底具有特定的切割角度或传播方向和SiO/sub 2/薄膜具有正TCF。许多旨在通过在具有负TCF的衬底上沉积具有正TCF的SiO/ sub2 /薄膜来改善TCF的研究已被报道。然而,由于这种衬底的TCF绝对值较大,因此需要一层相对较厚的SiO/sub 2/薄膜来补偿其TCF。作者从理论上和实验上详细研究了相反的组合,即具有负TCF的ZnO薄膜与具有适当正TCF的石英衬底的组合,并选择合适的衬底切割角和传播角。结果表明,作者首次利用ST-cut 35/spl度/X传播石英衬底(29/spl度/45' Y旋转和42/spl度/45' Y旋转35/spl度/X传播石英)实现了具有适当机电耦合系数(k/sub /s /sup /=0.011)、良好TCF (/spl ap/Oppm//spl度/C)和IDT/ZnO/短平面/石英结构中的零功率流角的SAW衬底。
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引用次数: 18
Investigation of longitudinal leaky surface acoustic wave on lithium niobate and quartz 铌酸锂和石英的纵向泄漏表面声波研究
X. Tong, D. Zhang, Y. Li, Y. Shui
The high frequency SAW transducers have shown great vitality in mobile phone and satellite communications and so on. One of the important ways to raise the working frequency and keeping the size of strips unchanged is to utilize the SAW devices based on high velocity acoustic wave modes. Therefore, the investigation of quasi-longitudinal acoustic surface leaky waves (QLASLWs) is of great significant because of its potential applications. Both theoretical and experimental results on LiNbO/sub 3/ and quartz are shown in this paper, for example, on LiNbO/sub 3/ in the range of Euler angles (0/spl deg/, /spl beta/, 90/spl deg/), the theoretical velocities are between 6000 m/s and 7000 m/s, nearly about twice that of normal surface waves, but the piezoelectric coupling coefficients varies between about 0.14% to 0.5%, much less than that of surface waves. The experimental results, for example, on LiNbO/sub 3/ at Euler angle (0/spl deg/, 38/spl deg/, 90/spl deg/), shows well agreement with the theoretical results. The theoretical results on quartz in the range of Euler angle (0/spl deg/, 124/spl deg/, /spl gamma/) are also shown in this paper.
高频SAW换能器在手机、卫星通信等领域显示出巨大的生命力。利用基于高速声波模式的声表面波器件是提高工作频率和保持带材尺寸不变的重要途径之一。因此,准纵声表面漏波的研究具有重要的应用价值。本文给出了LiNbO/sub 3/和石英的理论和实验结果,例如,在欧拉角范围内(0/spl°/,/spl β /, 90/spl°/),LiNbO/sub 3/的理论速度在6000 ~ 7000 m/s之间,几乎是普通表面波的两倍,但压电耦合系数变化在0.14% ~ 0.5%之间,远小于表面波。以欧拉角(0/spl°/、38/spl°/、90/spl°/)下的LiNbO/ sub3 /为例,实验结果与理论结果吻合较好。本文还给出了石英在欧拉角(0/spl度/、124/spl度/、/spl伽马/)范围内的理论结果。
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引用次数: 2
Advanced mobile communications radiointerface (CTDMA) architecture based on SAW components 基于SAW组件的先进移动通信无线电接口(CTDMA)体系结构
V.N. Kurskii, V. V. Proklov
The new architecture of a spread spectrum code-time division multiple access mobile communication system radiointerface (CTDMA) based on surface acoustic wave (SAW) and planar acousto-optics (AO) components is firstly developed in accordance with the Universal Mobile Telecommunication System (UMTS) requirements.
根据通用移动通信系统(UMTS)的要求,首次提出了基于表面声波(SAW)和平面声光(AO)组件的扩频码时分多址移动通信系统无线电接口(CTDMA)新架构。
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引用次数: 3
Improved resolution and dynamic range in medical ultrasonic imaging using depth-dependent mismatched filtering 利用深度相关不匹配滤波提高医学超声成像的分辨率和动态范围
A. R. Brenner, K. Eck, W. Wilhelm, T. Noll
The authors present a depth-dependent mismatched-filter pulse compression technique which improves range resolution and dynamic range of coded excitation ultrasonic imaging compared to a matched-filter pulse compression. After choosing a suitable magnitude spectrum, frequency weighting is used to design the appropriate mismatched filter depth-dependently, which allows to control mainlobe width and sidelobe characteristics. Both simulations and measurements are used to demonstrate the efficacy of the technique. A VLSI implementation of a depth-dependent mismatched filter is shown to be feasible.
作者提出了一种深度相关的非匹配滤波器脉冲压缩技术,与匹配滤波器脉冲压缩相比,该技术提高了编码激发超声成像的范围分辨率和动态范围。在选择合适的幅值谱后,利用频率加权设计合适的非匹配深度滤波器,实现对主瓣宽度和副瓣特性的控制。通过仿真和实测验证了该技术的有效性。一个深度相关的不匹配滤波器的VLSI实现是可行的。
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引用次数: 14
A frequency spectral analysis of the fiber failure acoustic emission signal in a single fiber composite 单纤维复合材料中光纤失效声发射信号的频谱分析
A. Calabro, C. Esposito, A. Lizza, M. Giordano, S. Tedesco, A. D’Amore, L. Nicolais
A new acoustic emission failure mode analysis methodology for composite materials was developed. A single carbon fiber composite based on a polyester matrix has been used as a simple model. Fiber breakage during tensile loading tests was observed by using a polarized light microscope and simultaneously detected by a resonant acoustic probe. The resonant probe was used as a trigger for recording the fiber failure events. Single acoustic emission events from a wide band probe were recorded for fast Fourier transform analysis. The single fiber specimen, having an unique failure mode, presents advantages for standardization of AE techniques for quantitative analysis of failures in polymer composite materials. The same procedure can be exploited to investigate the other failure modes, namely fiber-matrix debonding and matrix cracking.
提出了一种新的复合材料声发射失效模式分析方法。基于聚酯基体的单一碳纤维复合材料被用作一个简单的模型。利用偏振光显微镜观察纤维在拉伸加载过程中的断裂情况,同时用共振声探针检测纤维断裂情况。谐振探针被用作记录光纤失效事件的触发器。记录了宽带探头的单声发射事件,用于快速傅里叶变换分析。单纤维试样具有独特的失效模式,为定量分析聚合物复合材料失效的声发射技术标准化提供了有利条件。同样的方法也可以用于研究其他的破坏模式,即纤维-基体脱粘和基体开裂。
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引用次数: 6
In vitro correlation of echogenicity and differential echogenicity with human prostate cancer grade 人前列腺癌分级与体外回声强度及差异回声强度的相关性
M. L. Wicks, H. Sun, M. Russell, S. Neal, E. Boote, L. J. Anglo, G. Ross, T. Loy
Results are presented from an ongoing project at the University of Missouri-Columbia (MU) which focuses on the detection, grading, and staging of prostate cancer. The study addressed in this paper was performed in vitro using human prostates obtained from radical prostatectomies. Each prostate was transversely sectioned to extract a 2 mm slice which was then ultrasonically scanned. Cancerous and benign regions of the prostate were subsequently identified on the tissue slice by a pathologist. This scanning and analysis procedure allowed for a one-to-one correlation of actual tissue histopathology and acoustic parameter images. Echogenicity and differential echogenicity measures were calculated based on integrated backscatter, backscattered power spectra, and backscatter coefficient. Of these measures, only the backscatter coefficient, which was corrected for spatial variations in attenuation, showed a statistically significant trend with cancer grade. This trend suggests a new result which is that the inherent echogenicity of cancerous tissue decreases with increasing cancer grade.
结果来自密苏里-哥伦比亚大学(MU)正在进行的一个项目,该项目专注于前列腺癌的检测、分级和分期。本文的研究是在体外用根治性前列腺切除术获得的人类前列腺进行的。每个前列腺横切面取2mm切片,然后超声扫描。前列腺癌和良性区域随后由病理学家在组织切片上确定。这种扫描和分析程序允许实际组织病理学和声学参数图像的一对一关联。基于后向散射、后向散射功率谱和后向散射系数计算回波性和差分回波性。在这些测量中,只有对衰减的空间变化进行了校正的后向散射系数显示出与癌症等级有统计学意义的趋势。这一趋势提示了一个新的结果,即癌组织的固有回声性随着癌级的增加而降低。
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引用次数: 1
Design and fabrication of a miniaturized annular array 小型化环形阵列的设计与制造
N. Bourriot, Sylvain Ballandras, W. Steichen, P. Maitre, B. Piwakowski, J. Gelly, B. Piranda, R. Muksch
Advances in microtechnology reinforce the interest in the development of miniaturized transducers for endoscopic imaging applications. The present work is devoted to the design and fabrication of miniaturized annular array transducer. A first design of the transducer has been performed using an analysis of the radiated pressure in a semi-infinite liquid based on a time-domain computation (DREAM program). The selected structure has been then simulated using an harmonic FEA taking piezoelectricity and material losses into account. A simplified boundary condition based on a plane wave radiation condition was used to simulate the immersed regime of the transducer. However, this approach allows one to estimate the pressure at the radiation surface of the transducer which can be used to improve the calculation of the acoustic pressure distribution in the liquid. The results of this design approach can be used to fabricate a test structure using ultrasound micromachining techniques adapted to sub-millimeter structure applications (resolution in the range 50 microns, machining depth close to 1 mm). A 2 mm diameter annular PZT structure has been built and tested. Theoretical and experimental results concerning the admittance of the annular array are compared. Design consideration for the fabrication of the 1.2 mm diameter transducer are exposed and discussed.
微技术的进步加强了对内窥镜成像应用的小型化换能器的开发兴趣。本文主要研究了小型化环形阵列换能器的设计与制造。利用时域计算(DREAM程序)对半无限大液体中的辐射压力进行了分析,完成了换能器的初步设计。然后使用谐波有限元法对所选结构进行了模拟,并考虑了压电性和材料损耗。采用基于平面波辐射条件的简化边界条件来模拟换能器的浸入状态。然而,这种方法可以估计换能器辐射表面的压力,这可以用来改进液体中声压分布的计算。该设计方法的结果可用于使用适用于亚毫米结构应用的超声微加工技术制造测试结构(分辨率在50微米范围内,加工深度接近1毫米)。建立并测试了直径为2mm的环形压电陶瓷结构。对环形阵列导纳的理论和实验结果进行了比较。对直径1.2 mm换能器的设计考虑进行了讨论。
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引用次数: 5
Ultrasound biomicroscopy and magnetic resonance imaging of reconstituted articular cartilage 重建关节软骨的超声生物显微镜和磁共振成像
K. Harasiewicz, H. Gahunia, C. Lemaire, N. Konyer, H.K.W. Kim, P. Babyn, K. Pritzker, F. Foster
A system based on reconstituted articular cartilage is used to facilitate evaluation of noninvasive imaging methods such as ultrasound biomicroscopy (UBM) and magnetic resonance imaging (MRI) for assessment of osteoarthritis (OA). Chondrocytes from the superficial and deep layers of calf articular cartilage were isolated and cultured. Some cultures were treated with interleukin 1 (Il-1) and the effects on cartilage growth were studied. On days 21, 35, and 56 the cartilage cultures were examined using UBM, MRI, and histology. Cartilage thickness measured using UBM, MRI, and histology were similar with the correlation coefficients of 0.982 (P<0.0001) and 0.998 (P<0.0001) respectively. Comparisons of the UBM images with histology and MRI are presented and potential application of the real time UBM imaging of cartilage is discussed.
一种基于重建关节软骨的系统被用于促进无创成像方法的评估,如超声生物显微镜(UBM)和磁共振成像(MRI),用于评估骨关节炎(OA)。分别从小腿关节软骨的浅层和深层分离培养软骨细胞。用白细胞介素1 (Il-1)处理部分培养物,研究其对软骨生长的影响。在第21、35和56天,用UBM、MRI和组织学检查软骨培养物。UBM、MRI和组织学测量的软骨厚度相似,相关系数分别为0.982 (P<0.0001)和0.998 (P<0.0001)。介绍了UBM图像与组织学和MRI的比较,并讨论了软骨实时UBM成像的潜在应用。
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引用次数: 0
Effect of humidity on SAW devices 湿度对SAW器件的影响
V. Anisimkin, S. Maximov, P. Verardi, E. Verona
Adsorption of water vapors on single crystal and polycrystalline substrates is analyzed using the propagation of surface acoustic waves as an experimental tool. The perturbation in the SAW velocity (/spl Delta/v/v/sub 0/), the number N of adsorbed species as well as the changes in the density /spl Delta//spl rho///spl rho/ and in the elastic moduli /spl Delta/c/sub ij//c/sub ij/ of the sorbent materials, are deduced in terms of the normalized SAW displacements A/sub x/, A/sub y/, A/sub z/ and of the unperturbed SAW velocity v/sub 0/. Vapour adsorption on polished plates of single crystal quartz and polycrystalline films of Pd and Pd:Ni is experimentally investigated. Results of the measurements clearly show that humidity adsorption gives rise to effects whose amplitude is larger and whose time duration is longer in the films than in the plates. These effects are also dependent on the orientation of the quartz, allowing to monitor the value and the rate of the effect by proper selection of a substrate material.
利用表面声波的传播作为实验工具,分析了水蒸汽在单晶和多晶衬底上的吸附。根据归一化SAW位移A/sub x/、A/sub y/、A/sub z/和未受扰动的SAW速度v/sub 0/,推导出SAW速度的扰动(/spl Delta/v/v/sub 0/)、吸附物质的数量N以及吸附材料的密度/spl Delta//spl rho// spl rho// spl rho/和弹性模量/spl Delta/c/sub ij//c/sub ij/的变化。实验研究了Pd和Pd:Ni在单晶石英抛光片和多晶膜上的水蒸气吸附。测量结果清楚地表明,湿度吸附引起的效应在薄膜中比在板中振幅更大,持续时间更长。这些影响也取决于石英的方向,允许通过适当选择衬底材料来监测影响的值和速率。
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引用次数: 6
Boundary element solutions for acoustic wave propagation in media with nonuniform flow 声波在非均匀流动介质中传播的边界元解
P. Eccardt, H. Landes, R. Lerch
The interaction between acoustic wave propagation and a fluid in motion can be described by a system of coupled equations. For many applications like ultrasound flowmeters, medical ultrasound diagnostics, environmental acoustics or air conditioning systems, the influence of the acoustic waves upon the flow can be neglected. This allows a separation and therefore a successive solution of the problem. The results of finite element (FEM) simulations based on a modified wave equation with the flow profile as a boundary condition have been previously presented. In this paper, a new boundary element (BEM) technique is reported to solve this problem. One major advantage over FEM is the reduced dimension of the problem, leading to easier meshing and, especially for unbounded domains, to reduced computational effort. For the new BEM approach the Green's function had to be modified to consider flow. Based on an approximate Green's function a boundary element solution was developed. This new approach is compared with the previously implemented FEM scheme as well as with experiments measuring the sound pressure in a flow channel for various geometries and flow profiles. The results show good agreement between experiment and simulation. The limitations of this approach will be discussed.
声波传播与运动中的流体之间的相互作用可以用一个耦合方程组来描述。对于超声流量计、医学超声诊断、环境声学或空调系统等许多应用,声波对流量的影响可以忽略不计。这允许分离,因此问题的连续解决。以流型为边界条件,基于修正波动方程的有限元模拟结果已被提出。本文提出了一种新的边界元(BEM)技术来解决这个问题。相对于FEM的一个主要优点是问题的维度降低了,这使得网格划分更容易,特别是对于无界域,减少了计算工作量。对于新的边界元法,必须修改格林函数以考虑流动。在近似格林函数的基础上,建立了边界元解。将该方法与已有的有限元方法进行了比较,并与测量不同几何形状和流型流道内声压的实验进行了比较。实验结果与仿真结果吻合较好。我们将讨论这种方法的局限性。
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引用次数: 2
期刊
1997 IEEE Ultrasonics Symposium Proceedings. An International Symposium (Cat. No.97CH36118)
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