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聚焦换能器     
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  focusing transducer
     The focusing transducer with spherical acoustic lens is studied and made. Its nominal element size is 20mm and its nominal frequency is 2.5MHz. Its focal distance in water is 25mm and its focal spot size is 2mm.
     研制了带曲面声透镜的聚焦换能器,其相关指标为:换能器晶片尺寸:20mm、标称频率2.5MHz、水中焦距25mm、焦斑尺寸:2mm。
短句来源
     The effect of parameters of a typical confocal transducer, which is made from dividing a concave focusing transducer into two concentric parts, on the transverse and axial resolutions of a vibro-acoustography system is studied theoretically by introducing the point spread function (PSF) and defining the axial response function (ARF) based on the basic principle of vibro-acoustography.
     本文从振动声成像的基本原理出发,通过引入点扩展函数PSF和定义轴向响应函数ARF,研究了由凹球面聚焦换能器分割而成的一种典型共焦换能器参数对振动声成像系统侧向分辨率和轴向分辨率的影响。
短句来源
     On the theoretical basis of reciprocity calibration of focusing transducer in convergent spherical acoustic wave
     论聚焦换能器的会聚球面波互易校准的理论基础
     During free field reciprocity calibration for a convergent spherical acoustic wave of a focusing transducer, the diffraction loss correction coefficient is a key parameter of obtaining the reciprocity coefficient.
     在聚焦换能器的会聚球面波自由场互易校准法中,衍射损失修正系数是获得互易常数的一个关键参数.
短句来源
     Through optimizing ultrasonic testing parameters and using focusing transducer, the artificial blat-bottom hole with 1mm dimension can be detected with ultrasonic C-scan imaging system.
     通过优化超声检测仪的检测参数,采用研制的水浸聚焦换能器对铸造铅锑锡合金试件实施了水浸超声C扫描成像检测,可检测出φ1.0mm的人工平底孔缺陷。
短句来源
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  focused transducer
     The technology and physical properties of 10MHz short pulse ultrasonic focused transducer
     10MHz短脉冲超声聚焦换能器的工艺及效果
短句来源
     A new type multi-elements focused transducer was presented in this paper. It is composed of six-lens style single-element transducers mounted on a concave sphere of a radius of 146 mm. The lens radius of curvature is 112mm and it is operated at 1 MHz.
     提出一种新型的多阵元聚焦换能器,该聚焦换能器由6个排列在一个球径为146 mm的凹球面上的透镜式单元换能器组成,透镜曲率半径为112 mm,工作频率为1 MHz。
短句来源
     Design and Application of Ultrasound Focused Transducer for the Ultrasonic Feature Imaging Testing System
     聚焦换能器的研制和在超声特征成像中的应用
短句来源
     An ultrasonic focused transducer mainly used in biomedical technology, with its main frequency of 10MHz and the duration of one and a half periods, is described in detail in this paper.
     文章报导了为生物医学研究用的聚焦换能器 ,可以在水中发出延续时间为一个半周期 ,主频为 10MHz的超声脉冲。
短句来源
     Discussions of the ultrasound power calculating of large-aperture focused transducer intercepted by cone reflector
     用锥面靶测量大口径聚焦换能器声功率的计算讨论
短句来源
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  focusing probe
     An Application of Focusing Probe in SiCp/Al Composites′ Nondestructive Testing
     聚焦换能器在SiCp/Al复合材料超声无损检测中的应用
短句来源
     In order to deal with effect of the high damping, focusing probe with focused sound field is used in testing.
     为了克服高阻尼影响,采用了具有声束聚焦性能的聚焦换能器对不同形状的该种复合材料工件进行检测;
短句来源
     Combined with focusing probe, the testing precision is improved, and both size and shape defects may be measured directly.
     结合聚焦换能器的声场特性,一方面可以提高检测的精度,另一方面又可以获取缺陷的尺寸和形状。
短句来源
  focused transducers
     Calculations of pressure field and temperature field for wide aperture angle focused transducers
     大张角聚焦换能器声场及其温度场的计算
     This indicates that the method can be used effectively to estimate the radiation power of a dispersed array with focused transducers.
     这种结果说明了这种方法可以用来有效地估算离散阵列聚焦换能器的辐射力。
短句来源
     The complex sound field distribution of the focused transducers was calculated by the coordinate transform method,and the acoustic power was measured.
     该文应用坐标变换法对该聚焦换能器的复杂声场分布进行了数值计算,并测定了其声功率。
短句来源
     Radiation of dispersed array using focused transducers
     聚焦换能器离散发射阵列的辐射力计算
短句来源
     Test of sound-field for high frequency focused transducers using laser interferometry
     高频聚焦换能器声场的激光测量法
短句来源
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  focusing transducer
A focusing transducer based on a 9-μm thick PVDF foil was fabricated and tested for performance.
      
The alternative method to overcome this matter is to use focusing transducer, which is under development in our laboratory.
      
  focused transducer
A thick, focused transducer generated short (0.1μs), unipolar pressure pulses.
      
A through transmission ultrasonic inspection technique, which uses a flat transducer as a transmitter and a focused transducer as a receiver, is employed.
      
Using the extensively studied circular transducer for comparison, numerical results are shown for an unfocused transducer with uniform velocity excitation as well as for a focused transducer with Gaussian velocity excitation.
      
The model applies to normal-incidence, pulse-echo inspections of weakly-scattering materials using toneburst pulses from either a planar or focused transducer.
      
Impulse Modeling of the Rayleigh Wave Propagation Generated by a Spherical Focused Transducer
      
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  focusing probe
Due to its capability of producing a well localized intense heat field of predictable dimensions, the electromagnetic field focusing probe was evaluated experimentally as a surgical tool in aneurysm thrombosis.
      
The aneurysms were then placed under the solenoidal radiofrequency coil and the tip of the field focusing probe was inserted into them.
      
The UT procedures implemented for the ISI are mainly based on immersion technique using focused or focusing probe.
      
  focused transducers
A numerical model for simulating nonlinear pulsed beams radiated by rectangular focused transducers, which are typical of diagnostic ultrasound systems, is presented.
      
Characterization of spherically focused transducers using an ultrasonic measurement model approach
      
We used a mechanical scanning device with both unfocused and focused transducers.
      
There was good agreement (r=0.97) between the results with unfocused and focused transducers.
      
In addition, imaging the variations of BUA is possible with the focused transducers, and high quality images are obtained.
      
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