换能器

Transmitting and receiving impulse response of two-dimensional array are obtained by the summing impulse response of a single rectangular element with differentia delay time. The approximation arithmetic of array element impulse response is discussed.

讨论了单阵元声场脉冲响应函数的快速近似算法，通过对不同延时量的矩形单阵元声场脉冲响应函数进行叠加，得到了二维换能器阵列的发射和接收脉冲响应函数，再施加以宽带脉冲激励函数，从而得到二维换能器阵列的声场分布。

The ultrasonicpower supply provides appropriate electric for the transducer, and the transducertransforms the electric energy into the ultrasonic kinetic energy to make the Chinese traditional medicine liquor atomize.

高频超声波电源为换能器提供电能，换能器将电能转为动能，并对药罐里的中药进行快速雾化干燥。

The device parameter as well as resonance frequency,mechanical quality factor and work band width were determined by the equiv- alent circuit input impedance admittance circle diagram .

分析压电式超声波换能器的等效电路，并由等效电路输入阻抗的导纳圆图确定了换能器的元器件参数以及谐振频率、机械品质因数和工作带宽等特征参量。

One or both of transmit and receive aperture controls may include preventing some element of the transducer array from transmitting or receiving, calculating weighting apodizations to combine with standard apodizations for each frame, or determining an aperture size based on an f-number for the transducer array for each frame.

发射和接收孔径控制中的一个或二者可以包括：阻止换能器阵列中的某个元件进行发射或接收，针对每一帧计算加权变迹以将其和标准变迹相组合，或者针对每一帧根据换能器阵列的F数来确定孔径尺寸。

Considering the nonlinear rigid characteristic of the reed in the giant magnetostrictive actuator, a composite nonlinear model was developed involving the characteristics of square and cube values of reed's damping.

针对超磁致伸缩材料存在的换能器碟簧非线性刚度特性，建立了具有碟簧刚度的平方和立方非线性特性的超磁致伸缩换能器复合非线性数学模型。

Analysis and experimental results prove that this transducer has performances superior to ordinary interdigital transducer. The advantages are: easy to realize a high rate o...

分析和实验结果证明，这种换能器与普通叉指换能器相比，其优点是：在相同的制造工艺和满足规定的指间反射的情况下，容易实现高的成品率和较高的工作频率。

The choice principle of the parameters of ultrasonic transducer is studied too.

对换能器的各参数和选择进行了讨论，给出了换能器选择的原则。

The effective permittivity at the interface of piezoelectric crystal solid layer is employed to analyze the BAW excitation effect.

对压电晶体-固体-液体结构中叉指换能器的体声波激励效应进行了深入探讨，通过引入压电晶体-固体层界面的界面有效介电常数，研究了叉指换能器的体声波激励效应与晶体切向、电边界条件及固体层归一化厚度之间的关系。

The effects of matching circuit on resonant frequency and vibrational charac- teristics of piezoelectric ultrasonic transducers were studied.

研究了匹配电路对压电超声换能器共振频率及其振动特性的影响；分析了由匹配电路和换能器组成的能量传输系统的有效机电耦合系数与匹配电路参数之间的关系。

Four aspects of research achievements include:(1)several imaging correction methods and strained estimation methods for biological tissues elasticity imaging were investigated as well as elasticity reconstruction and phantom, in vitro and in vivo elasticity imaging experiments;(2)in the fields of biological microsystem and perfusion evaluation for microvascular system, three kinds of microbubbles whose shell are albumin, sugar ester and surfactant respectively were designed and produced, then the methods to estimate the thickness of their shells were presented, moreover, the interacting mechanism of ultrasound contrast agents and tissues, as well as protein drug delivery under the condition of ultrasound sonification were studied in the molecular level;(3) At the aspect of high intensity focused ultrasound therapy system, we designed and constructed the 256-element HIFU transducers using 1-3 composite materials. And furthermore we developed the integrated HIFU system with 256-element HIFU transducers. And we made preliminary and important progresses in the research of HIFU bioeffect, lesion estimation, techniques of monitoring and imaging and characterizing of structure of HIFU transducer;(4)The real-time method of voice source regeneration based on compensative regulation of physiological parameters was investigated in the field of medical rehabilitation. We addressed the physiology and biophysics of vocalization, modeled voice source regeneration based on compensative regulation mechanism, and put forward an integrated evaluation about the speech rehabilitation and the regenerated voice source; Sixty-one archived journal papers were published, as well as ten in international journals, and eighteen publications were embodied by SCI.

成果包括：（1）在生物组织弹性成像方面，研究了多种图像校正方法和应变估计方法，进行了弹性重构和仿体、离体及在体超声弹性成像实验研究；（2）在生物微系统和微血管血流灌注成像方面，制备了三种不同包膜超声造影微泡，研究了纳米包膜厚度检测与估计方法以及不同纳米包膜造影微泡断裂与药物释放机制，并在分子层次上开展了超声与生物组织相互作用机制以及蛋白质药物超声乳化微囊包裹的研究；（3）在阵列式高强聚焦超声治疗与监控成像技术方面，设计制作了新的HIFU换能器，解决了256阵元单焦点和多焦点合成HIFU治疗系统关键技术问题，并在HIFU生物效应与创伤性评价方法、HIFU过程监控成像技术和薄层复合结构与HIFU 换能器界面特性评价等方面的研究取得了初步而重要的进展，具有重要应用前景；（4）在语音听觉系统特别是嗓音康复方面，研究了基于发声系统补偿调节机制的实时多模式嗓音源再生方法和发声生理，建立基于神经、肌肉和空气动力系统的综合补偿调节模型，提出了相应的评价系统。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。