Optimization of Piezoelectric Flexible Ultrasonic Sensors Based on Backing Layer Matching

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Optimization of Piezoelectric Flexible Ultrasonic Sensors Based on Backing Layer Matching

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[1]YU Yongjie,DU Yuqi,HUANG Shilei,et al.Optimization of Piezoelectric Flexible Ultrasonic Sensors Based on Backing Layer Matching[J].Journal of Zhengzhou University (Engineering Science),2024,45(pre):2-.[doi:10. 13705 / j. issn. 1671-6833. 2025. 01. 006]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 45 Number of periods: 2024 pre Page number: 2- Column: Public date: 2024-12-31

Title:: Optimization of Piezoelectric Flexible Ultrasonic Sensors Based on Backing Layer Matching

Author(s):: YU Yongjie; DU Yuqi; HUANG Shilei; GAN Fangji

Keywords:: Flexible ultrasonic transducers; Backing layer matching; Impedance matching; Signal-to-noise ratio

CLC:: TP212；TH89

DOI:: 10. 13705 / j. issn. 1671-6833. 2025. 01. 006

Abstract:: Flexible ultrasound transducers based on polyvinylidene fluoride (PVDF) piezoelectric film have the advantages of easy matrixing, small size, light weight, and small blind area, but are susceptible to back clutter interference and impedance mismatch, resulting in a complex frequency component of the return signal and a low signal-to-noise ratio. In order to effectively absorb the stray waves at the back of the transducer and improve the ability of unidirectional radiation of acoustic energy, it is proposed to use tungsten powder and silica gel to design the backing layer for flexible ultrasonic transducers, which increases the signal amplitude of the transducer by 300 % while maintaining the overall flexibility of the transducer. Secondly, according to the electrical characteristics of the flexible ultrasonic transducer impedance matching optimization method for flexible ultrasonic transducers is proposed, and the best matching parameters are obtained through gradient experiments, so that the signal-to-noise ratio of the transducer is increased from 2 dB to 30 dB. optimized flexible ultrasonic transducers have the excellent performance of wide bandwidth, high frequency, narrow pulse, and the experimental results of the measurement of the thickness of pipe test specimens with different curvatures and wall thicknesses show that it can reach the accuracy of 0.01 mm.

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Last Update: 2024-10-10