Design, fabrication, and characterization of 1-3 piezoelectric composite air-coupled ultrasonic transducers with micro-membrane filter matching layer

Design, fabrication, and characterization of 1-3 piezoelectric composite air-coupled ultrasonic transducers with micro-membrane filter matching layer

Článek WoS

Air-coupled ultrasonic transducers are widely used in various fields of nondestructive material characterization. This paper presents the fabrication and performance characterization of 1-3 piezoelectric composite air-coupled ultrasonic transducers operating at frequencies ranging from 400 kHz to 600 kHz. The transducers are fabricated using a dice-and-fill method with PZT-5 as the active material. A double-layer matching strategy is employed, utilizing hollow glass microsphere filled epoxy resin as the first matching and bonding layer. Additionally, micro- membrane filters with different pore sizes are used as the second matching layer. Thermoplastic adhesive TPU is utilized to bind the micro-membrane filter and the first matching layer. Due to the low acoustic impedance of the hollow glass microsphere filled epoxy resin and micro-membrane filter, acoustic impedance mismatch is reduced. Finite element simulation is used to determine the optimal ceramic volume fraction and ceramic pillar height of the 1-3 piezoelectric composites. When the pore size of the micro-membrane filter is 0.8 mu m, the transducer achieves the lowest two-way insertion loss of-56.86 dB and the highest-6 dB bandwidth of 15.6 %, making it feasible for through mode applications.

Air-coupled ultrasonic transducers are widely used in various fields of nondestructive material characterization. This paper presents the fabrication and performance characterization of 1-3 piezoelectric composite air-coupled ultrasonic transducers operating at frequencies ranging from 400 kHz to 600 kHz. The transducers are fabricated using a dice-and-fill method with PZT-5 as the active material. A double-layer matching strategy is employed, utilizing hollow glass microsphere filled epoxy resin as the first matching and bonding layer. Additionally, micro- membrane filters with different pore sizes are used as the second matching layer. Thermoplastic adhesive TPU is utilized to bind the micro-membrane filter and the first matching layer. Due to the low acoustic impedance of the hollow glass microsphere filled epoxy resin and micro-membrane filter, acoustic impedance mismatch is reduced. Finite element simulation is used to determine the optimal ceramic volume fraction and ceramic pillar height of the 1-3 piezoelectric composites. When the pore size of the micro-membrane filter is 0.8 mu m, the transducer achieves the lowest two-way insertion loss of-56.86 dB and the highest-6 dB bandwidth of 15.6 %, making it feasible for through mode applications.

Piezoelectric composites; Air-coupled ultrasonic transducer; Matching layer; Micro-membrane filter

Piezoelectric composites; Air-coupled ultrasonic transducer; Matching layer; Micro-membrane filter

Wang, CM.; Gao, HY.; Zhou, XY.; Ma, WG.; Tan, H.; Samart, C.; Salamon, D.; Yan, CZ.; Zhang, HB.

2025

01.12.2024

ELSEVIER SCIENCE SA

LAUSANNE

1873-3069

SENSORS AND ACTUATORS A-PHYSICAL

379

115955

Švýcarská konfederace

11

https://www.sciencedirect.com/science/article/pii/S092442472400949X?via%3Dihub