Ultrasonic transducers and methods for preparing matching layers thereof

Abstract

The present disclosure provides an ultrasonic transducer and a method for preparing a matching layer. The ultrasonic transducer may include a piezoelectric layer and a matching layer. The matching layer may be provided between the piezoelectric layer and an object to be measured, the piezoelectric layer may be acoustically matched with the object through the matching layer, and the piezoelectric layer may facilitate conversion between ultrasonic waves and electrical energy. A sound velocity in the matching layer may be in a gradient distribution in at least one direction. Through the gradient distribution of the sound velocity in the matching layer, ultrasonic waves of different frequencies may have the same wavelength. Thus, an acoustic matching between the piezoelectric layer of different structures and the human body tissues may be realized, which improves transmittance of the ultrasonic wave in the matching layer and increases a bandwidth of the ultrasonic transducer.

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