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study on acoustic characteristics of high frequency medical ultrasonic transducer

Views: 7     Author: Site Editor     Publish Time: 2018-08-12      Origin: Site

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Researching on acoustic transducer layer materials began in the 1980s. In 1998, Kim Yeonbo and Roh Yongrae uses the method of time domain analysis to theoretically give a suitable for broadband, it is high energy ultrasound structure of the energy device and the best acoustic impedance matching value. Yasuharu Hosono gave RTv silicon.The rubber is mixed with fine metal and oxide powder to change its acoustic properties and applied to low frequency ultrasonic transducer sensor .In the acoustic sensor, the acoustic impedance matching problem between the lens and the human body is better solved. successfully developed the sound with impedance values is varying from 2 to 7 MRayl by nanopowder doping.In 2013, Taiwanese scholars Feng Guohua and Liu weifan won in order to obtain Ideal acoustic impedance matching transducer, a gradient of a micro piezoelectric ultrasonic transducer is using parylene is proposed.Matching to improve the transmission of sound energy and the bandwidth of the transducer, but the method is more complicated and less production. At present, the research on matching materials mainly focuses on the center frequency of 49Khz transducers commonly used in clinical medicine.In the low frequency range of 1.0 to 7.5 MHz, the materials are mostly epoxy or plastic with fixed acoustic properties.


In the development of high accuracy ultrasonic transducer, acoustic piezoelectric materials due to acoustic attenuation with increasing frequency index.The acoustic characteristics have higher requirements, and the existing acoustic matching and acoustic lens materials often cannot meet the demand. Because it is extremely important to modify the materials and to study the high frequency acoustic properties of the modified ones. This section from theoretical model simulation and sample experimental study is different from aspects of silicone rubber material .The volume fraction of alumina particles changes their characteristics such as sound velocity, sound attenuation, and acoustic impedance.The acoustic volume matching of 20 MHz high frequency transducers and the optimum volume ratio of lens fabrication have been developed for transducers.


1-3 type piezoelectric composite material has high thickness direction electromechanical coincidence coefficient, low acoustic impedance, low transverse machine.It has electrical cohesion coefficient, low dielectric constant, low mechanical quality factor, good flexibility and controllability. It is suitable to use as a piezoelectric material in medical ultrasonic transducers. This section uses the cutting and filling method to prepare the l-3 type piezoelectric composite material was developed by focusing the spherical and cylindrical surfaces on the l-3  type piezoelectric composite material.It is high frequency self-focusing ultrasound transducer.


 Because the l-3 type piezoelectric composite has a high thickness direction electromechanical cohesion coefficient,Transducer distance sensor circuit has low acoustic impedance and low cross.which has electromechanical cohesion coefficient, low dielectric constant, low mechanical quality factor, flexibility and controllability.It is more suitable to use as a piezoelectric material in medical ultrasonic transducers. This article uses the cutting and filling method.They prepared l-3 type piezoelectric composite material, wherein the geometric formula of the type 1-3 PzT-SH/E poxy composite material prepared therein. It can be seen that the piezoelectric ceramic column has a square cross section, the column width reef is 36.03 um, and the thickness d is
a piezoelectric ceramic post with a period of 36.52 um, in which the slit width is 24.14 um. Finally, a ultrasonic range finding sensor is having a piezoelectric ceramic material volume fraction of 35.84% was obtained.


In the process of preparing the l-3 type composite, the cleaning and filling of the polymer determines the piezoelectric polymer.The key to the quality of the joint, at the same time, temperature control of ultrasonic proximity sensors in the epoxy curing process is also the key to the performance of the composite. Applying an electrode to the upper and lower surfaces of the fabricated l-3 type piezoelectric composite by electroless plating.


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