文献类型：期刊文献

英文题名：Bandwidth enhancement of cellular polypropylene-based ferroelectret ultrasonic transducers via backing layer

作者：Wang, Shiyu[1];Xu, Peng[2];Li, Donglin[1];Quan, Yi[1];Lu, Qi[1];Zhang, Kun[1];Zhang, Shilong[1];Li, Haoliang[2];Sun, Xinhao[1];Qiu, Xunlin[2];Fei, Chunlong[1];Xiang, Yanxun[2];Yang, Yintang[1]

机构：[1]Xidian Univ, Xidian, Peoples R China;[2]East China Univ Sci & Technol, Shanghai, Peoples R China

年份：2026

卷号：410

期号：P1

外文期刊名：SENSORS AND ACTUATORS A-PHYSICAL

收录：;EI(收录号：20263021158990);Scopus(收录号：2-s2.0-105045409820);WOS:【SCI-EXPANDED(收录号:WOS:001834886200001)】；

基金：This work is supported by the Fundamental Research Funds for the Central Universities (YJSJ25013) , the National Natural Science Foundation of China (52402154, 62474129, 12174102, 12025403, 12304511, 62090040, 62090043, 61934006 and 52321002) , National Key Research and Development Program of China (2022YFB4401300, 2022YFB4401301) , Shanghai Gaofeng Project for University Academic Program Development.

语种：英文

外文关键词：Broad bandwidth; Backing layer design; Air-coupled ultrasonic transducer

摘要：The limited echo-based relative bandwidth (similar to 20%) of air-coupled ultrasonic transducers (ACUTs) remains a major constraint in practical applications, directly impairing both imaging resolution and the usable frequency range. To address this, we introduce a backing layer behind the piezoelectric element in Cellular polypropylene (cPP) based ACUTs to absorb residual vibrations during ultrasound transmission and reception, thereby broadening the bandwidth. An equivalent circuit model was developed to theoretically analyze the effect of backing-layer acoustic impedance on bandwidth. Experimentally, three representative backing transducers were fabricated and evaluated. Results demonstrate that a composite backing of PDMS and hollow glass microspheres (HGM-PDMS) boosts the echo-based relative bandwidth of transducer to 38.5%. Compared to the 20% bandwidth of conventional air-backed or copper-backed ferroelectret ACUTs, this advancement represents an enhancement in bandwidth performance, effectively improving the measurement accuracy and imaging quality.