超声换能器

聚焦超声换能器的频率和曲率半径对生物学焦域的影响

Effects of Frequency and Curvature Radius of HIFU Transducer on Biological Focal Region

设计相应硬件电路和软件程序，分别用模拟电路和数字电路实现信号处理系统；根据仿真分析的结论，设计超声换能器方形阵列。

The signal processing system is realized using analog circuits and digital circuits respectively . Besides , a transducer square array is designed based on simulation results .

基于DDS的超声换能器频率跟踪系统

Frequency Tracing System for Piezoelectric Transducer Based on DDS

电磁超声换能器（ElectromagneticAcousticTransducer，简称EMAT）是一种在导体中激励和检测超声波的换能装置。

Electromagnetic acoustic transducer ( EMAT ) is a type of device that excite and detect ultrasonic .

基于VxD在超声换能器检测系统的应用

The Application of VxD in the Detective System of Ultrasonic Energy Converter

在临床运用中，应根据临床方案优化设计适合临床应用的一定频率（f）和曲率半径（R）的聚焦超声换能器。

According to treatment planning in clinic , so it is necessary to select HIFU transducer with suitable frequency ( f ) and curvature radius ( R ) of lens .

由于钙离子A位固溶改性钛酸铅烧结多晶材料具有压电各向异性和其它优良的电学性能，所以该材料可广泛应用于制造高频超声换能器、红外检测器和声表面波（SAW）器件。

Sintered polycrystals made from calcium_ion A_side modified lead titanate is used for making high_frequency ultrasonic transducers , infrared detectors and surface acoustic wave devices due to their dielectric dispersion and other electrical properties .

结果表明，该材料比PZT陶瓷更适宜于制作高灵敏度水听器和窄脉冲超声换能器。

It is showed that the sandwich composite is better than PZT material in the manufacture of high sensitivity hydrophone and short pulse ultrasonic transducer .

串行级联CPM系统的迭代译码及其改进压电超声换能器初级串联匹配新方法

Iterative Decoding of Serially Concatenated Continuous Phase Modulation System and Its Improvement ; Novel primary series matching scheme for piezoelectric ultrasonic transducer

该放大器一致性好，对于超声换能器阵元具有较强的适应性，能够满足相控型HIFU功率放大技术的要求。

This amplifier has the good consistency and strong adaptability to the ultrasonic transducer , it meets the need of HIFU phased array .

新型压电单晶PMN-PT的性能及其在医用超声换能器中的应用

Novel Piezoelectric Single Crystals PMN-PT and Their Applications in Medical Ultrasonic Transducers

电磁超声换能器（EMAT）是一种新型的超声波发射接收装置。

The electromagnetic acoustic transducer ( EMAT ) is a new ultrasonic transmitting and receiving device .

基于Fourier-Bessel分解的环型超声换能器设计

Design of Annular Ultrasonic Transducer Based on Fourier - Bessel Decomposition

电磁超声换能器（EMAT）是一种通过电磁耦合方法产生和接收超声波的换能器。

An electromagnetic acoustic transducer ( EMAT ) can produce and receive ultrasonic waves though electromagnetic coupling .

PMN-PT驰豫铁电单晶及其超声换能器性能研究

PMN-PT Ferroelectric Relaxor Crystal and Its Ultrasonic Transducer

（Na（0.5）Bi（0.5））TiO3-BaTiO3系统在一定组成范围内是性能优良而独特的超声换能器陶瓷新材料。

The ( Na_ ( 0.5 ) Bi_ ( 0.5 )) TiO_3-BaTiO_3 system , at certain composition range , is a new kind of ultrasonic transducer ceramics material which has good and unique properties .

简要叙述了电磁超声换能器（EMAT）的基本原理、主要特点及其在管加工厂管端探伤中应用的情况。

Introducing the theory of EMAT as well as its main characters and the applications in pipe end inspection at Pipe Finishing Plant .

本文的主要工作有：1.针对超声换能器和回波特性，设计了基于双VGA的模拟前端接收电路，调试完成并实际应用于系统中，较好的提高系统信噪比。

For the ultrasonic transducer and the echo characteristics , based on dual VGA analog front-end receiver circuit is designed to improve the SNR of the imaging system . 2 .

HIFU性能的好坏，治疗效果的优劣，与聚焦声场分布有着密不可分的关系。所以对HIFU声场测量是研究聚焦超声换能器的重要环节。

The capability and effect of HIFU have a tight relationship with the acoustic field distributions . So the measurement of HIFU acoustic field is the significant part of focusing ultrasonic transducer researching .

例如：球壳超声换能器产生的高聚焦超声（HIFU）无法透过肋骨聚焦；对较大体积的肿瘤治疗时间过长等。

For example : high intensity focused ultrasound ( HIFU ) produced by shell ultrasonic transducer could not be focused through the ribs and on the treatment of large volume tumor need a long time .

其次，采用KZK方程对指向性声源在空气中的传播特性进行了数值仿真，仿真过程中采用的超声换能器模型是实际测量得到的。

Secondly , the characteristic of directional sound in the air is numerically simulated using the KZK equation .

然而，由于EMAT工作机制复杂，工件的电、磁、声学性能会直接影响电磁超声换能器的特征，因此无论是从原理还是从应用，电磁超声换能器都存在着大量的问题没有解决。

However , as a result of the working mechanism of EMAT is very complex , the working electric , magnetic , acoustic performance will directly affect the electromagnetic ultrasonic transducer characteristics .

与纯P（LN）ZT压电陶瓷相比，1-3型聚合物/水泥基压电复合材料厚度方向振动增强，机械品质因数Qm明显降低，这有利于提高超声换能器的发射效率和接收灵敏度。

Compared with P ( LN ) ZT , the thickness vibration mode of 1-3 type piezoelectric composites is strengthened obviously , but electromechanical quality factor Q-m is reduced . All of these are in favor of increasing the emission efficiency and receiver sensitivity .

方法使用同一聚焦超声换能器，辐照深度、功率一致条件下，静脉注射等量氟碳乳剂（实验组）或生理盐水（对照组）后，用HIFU辐照兔肝脏，测量凝固性坏死体积，计算能效因子。

Methods Using identical focused ultrasound transducer , with fixed irradiation depth and power , the livers of 16 New Zealand white rabbits were irradiated with HIFU after isovolumic physiologic saline ( control group ) or perfluorocarbon emulsion ( experimental group ) were injected intravenously .

硬件电路主要采用单片机来控制发射电路来激励超声换能器，并控制A/D来转换超声模拟回波信息，同时控制FIFO来对数据进行缓存，最后把回波信息通过接口电路传送到PC机上。

Hardware circuit mainly adopts the MCU to control the emission circuit of ultrasonic transducer for driving , and controls the A / D to convert the ultrasonic analog echo information . At the same time , it controls the FIFO to cache the echo information .

UF-911流量计是专用于大流量测量的高精度流量测量系统，配有多种超声换能器。

UF-911 flowmeter with many power ultrasonic transducers is only used in the high precision flow rate measuring system measured by the great flow rate .

超声换能器优化设计是一个带约束并包含连续和离散设计变量的多目标优化问题（MOP）：把输入功率和输出振幅作为目标函数，使用多目标进化算法进行求解，获得一系列优化解。

The design problem is a constrained multi-objective optimization problem , involving continuous and discrete variables . The maximum vibration and the minimum electrical input power are considered as optimization objectives . Multi-objective evolutionary algorithms are applied in the optimization process and a set of Pareto-optimal design is obtained .

用SYC-2型超声波测试仪和20kHz超声换能器实测了不同温度和不同含水率下冻结粉质粘土的纵波波速，对实验数据进行了分析。

Using SYC-2 type supersonic wave test instrument and 20 kHz energy transducer , the authors are able to measure the longitudinal wave velocity of frozen silty clay under different temperature and moisture conditions .

建立了超磁致伸缩超声换能器的有源元件Terfenol-D棒和各振动组件的机电等效电路，与电路理论相类比推导出谐振状态的频率方程，求解频率方程得出换能器各部分的结构尺寸。

The equivalent circuit of the transducer 's vibrational components has been established and the frequency equations of resonance state and educing the dimensions of the transducer components has been gained .

提出了一种新的多阵元球壳形超声换能器结构，该换能器由113个排列在一个孔径为112mm的球形凹面上的圆形压电陶瓷片构成，焦距为100mm，工作频率为1MHz。

In this paper , a new Multi elements spherical ultrasound transducer has been developed for ultrasound noninvasive therapy , it incorporates 113 8 mm diameter circular piezoelectric ceramics elements mounted on a spherical shell , it has a 100 mm focal length and is operated at 1 MHz .