Air coupling ultrasonic transducer based on piezoelectric material with acoustic impedance gradient structure

• Main Authors: SU WAN, ZHU SAIJIE, LU ZHIYUAN, GUO ZIYI, BAO CONGCONG, LIU YINGLUO, WANG XIAOYU
• Format: Patent
• Language: Chinese; English
• Published: 01.09.2023
• Subjects: FOR PERFORMING MECHANICAL WORK IN GENERAL; GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL; METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY; PERFORMING OPERATIONS; TRANSPORTING

The utility model discloses an air coupling ultrasonic transducer based on a piezoelectric material with an acoustic impedance gradient structure, which sequentially comprises a backing sound absorption layer, a first electrode layer, a piezoelectric vibrator with an acoustic impedance gradient structure, a second electrode layer and a matching structure along an effective sound emission direction, the acoustic impedance coefficient of the piezoelectric vibrator with the acoustic impedance gradient structure in the effective sound propagation direction is reduced, and the piezoelectric vibrator comprises a piezoelectric ceramic structure and a polymer composite material structure. The piezoelectric ceramic structure comprises a plurality of piezoelectric ceramic layers, and the communication number in the effective sound emission direction is reduced or the piezoelectric ceramic volume ratio is reduced; the polymer composite material structure comprises more than two polymer composite material layers, the com