High-performance Backing Materials In The Application Of1-3Composite Broadband Transducer

In modern times, medical ultrasound imaging requires ultrasound imagingsensor with high resolution, so as to facilitate the diagnosis and treatment can bringmany diseases.And how to maximize the ultrasonic transducer’s vertical resolutionhas been a hot research.As the core part of the ultrasound transducer: piezoelectricvibrator, the backing material, the matching layer are of great importance forimproving the bandwidth of the ultrasonic transducer.In this paper we introduce the spatial structure and process for preparing1-3composite piezoelectric material.And make a brief introduction of "Cutting casting"line production steps1-3piezoelectric composites and performance parametersneeded control in the production process. Preparation of the center frequency f=1.8MHz, the acoustic impedance Z1=13.2MRayl1-3composite piezoelectricceramics.And make a brief introduction of the preparation process of make thebacking material in a conventional manner, and pointed out the the defects thatacoustic impedance and attenuation can not take into account of the backingmaterial in a conventional manner.And use of the "hot press" to make up for thisshortfall.Preparation of the material that acoustic impedance Z3=13MRayl,α=24.5dB/cm(1MHz)high-performance sound attenuation.Can make a good matchwith the1-3piezoelectric vibrator that has been prepared. In addition to we alsoprepared the matching layer(Z Z1Z3, d λ/4) that meet the matchingrequirement.Using the above prepared materials that conventional methods backingmaterial and hot pressing methods backing material to make ultrasonictransducer.Experimental results show that: the ultrasonic transducer that use of theconventional method at-6dB bandwidth of only32.9%, but the transduce that usingof hot press method bandwidth at-6dB of45.6%can be achieved. Band thematching layer will the transducer that use of the hot pressing we will find that thetransducers’ bandwidth increased by8%to53.8%.This study provides a concreteand practical way for improve the bandwidth of the transducers.