Preparation of matching layer and application for γ-radiation resistant ultrasonic transducer
The traditional ultrasonic transducer failure is caused mostly by the chemical bond fracture of organic materials of matching layers,which affects the accuracy of detection.In order to develop high per-formance radiation-resistant ultrasonic transducers,the matching layers were made by mixing good radiation resistance bisphenol A epoxy resin with different content Al2O3 particles(0-80％).The changes of appearance,density,sound velocity,acoustic impedance and attenuation of the matching layers were investigated under different γ-ray irradiation from 0 to 1000 kGy.With the increase of radiation dose,the color of the sample gradually was deepened,and the density almost remained unchanged,the sound velocity and acoustic impedance were slightly increased,and acoustic attenuation changed little.In addition,based on the above matching layer,an ultrasonic transducer with a central frequency of 9 MHz has been fabricated,the signal of the transducer almost remain unchanged after irradiation,indicating that matching layers can maintain good acoustic performance under large dose irradiation,which may have a great application potential in the design of γ-radiation resistant ultrasonic transducer.
Bisphenol A epoxy resinMatching layerγ-ray radiationUltrasonic transducer
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