Study on ultrasonic focusing Phased array

 In recent several decades,ultrasonic phased arrays had been applied to many medical specialties and nondestructive evaluation(NDE).An ultrasonic phased array consists of multiple Hifu piezo transducer impedance which are usually cut or etched from a single piezoelectric plate of lead zirconate tinate(PZT).The element thickness determines the operating frequency of the transducer.Another material frequency is used 15 Polyviny lindene(PVDF)，which 15 polymer being able to exhibit piezoelectric properties.The elements are individually excited at predetermined time delays to dynamically steer or focus the acoustical wave fronts.The steering and focusing characteristics of an array 15 determined by its geometric parameters.In the analyzing the characteristics,Phased arrays at first are considered as an array of simple point sources arranged in the azimuthal plane.This approach 15 mathematically is easier to deal with yet .it gives the same directivity in the ultrasonic high focusing piezo pickups .However an actual array always have finite dimensions.Second, the model of array was considered to have elements of finite width and infinitely large elevation dimension.This effect of elevation is on beam focusing.This paper studies on phased array which was considered to have HIFU piezo for weight loss of finite width and transducer parameters on focusing effect analyzed，including the number of elements(N)，Inter element spacing(d)，dimension(L)，width dimension(a).All this can be a fundamental for deeper investigate phased arrays.At the same time,the concentric HIFU piezo element sphere transducers are also analyzed.It can realize focusing on its axis.which studies on the radiate sound field by uses of relaying integrate field by rectangle plunger phased array,the pressure distribution of radiate sound of was derived,the directivity steering also was discussed.

  By means of numerical method，the influences of transducer parameters on focusing effect is analyzed including the number of electrical hifu piezoelectric sensor(N)，interelement spacing(d)，elevation dimension(L)，width dimension.

  Studying on the beam steering of phased array in the fur field..Study on radiate sound field of concentric一ring plunger phase:

  1 .By uses of relaying to integrate.the pressure distribution of radiate sound field  of wave steering also was discussed.
  2 .Study on the near field properties of ring plunger.
  3 .The analytical pressure distribution of ultrasonic phased array for the beam focusing was obtalned using the Huygen 5 Prlnciple，By use of computer software,the pressure distribution was plotted.
Circuit Design:
  1 .Introduce the digital electronic ernitting system.
  2 .Production and achievement of digital system
  3 .Measuring and receiving system of phased array transducer.