文献类型：期刊文献

英文题名：Waveguide Transducer for Generation and Reception of High-Frequency Narrow-Beam Ultrasonic Wave

作者：Liao, Zuoyu[1];Wang, Zhiping[1];Jia, Jiuhong[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China

年份：2023

卷号：23

期号：5

起止页码：4720

外文期刊名：IEEE SENSORS JOURNAL

收录：;EI(收录号：20230613546011);WOS:【SCI-EXPANDED(收录号:WOS:000967034700001)】；

基金：This work was supported by the National Natural Science Foundation of China under Grant 52175138. The associate editor coordinating the review of this article and approving it for publication was Prof. Stefan Johann Rupitsch.

语种：英文

外文关键词：Strips; Acoustics; Sensors; Transducers; Signal to noise ratio; Waveguide components; Monitoring; Bidirectional-tapering waveguide; narrow beam; quasi-fundamental shear horizontal (SH0*) wave; structural health monitoring; waveguide transducer

摘要：A new type of waveguide transducer with a bidirectional-tapering structure is proposed to generate and receive high-frequency narrow-beam ultrasonic waves, which can effectively improve the defect detection resolution of high-temperature critical components in specific direction. The waveguide unit is composed of an excitation region with a tapering structure, a uniform-thickness strip region, and an incident region with a broadening structure. The tapering structure will contribute to generating the high-frequency quasi-fundamental shear horizontal (SH0*) wave, and the uniform-thickness strip region is conducive to transmitting SH0* wave nondispersively, while the broadening structure can conduce to the incidence of the high-frequency narrow beam ultrasonic wave. The critical criteria for SH0* wave propagation with nondispersive waveform and high signal-to-noise ratio in the bidirectional-tapering waveguide are established using simulation and experiments. Moreover, the heat dissipation performance and beam radiation of the bidirectional-tapering waveguide are verified. The results show that the proposed bidirectional-tapering waveguide transducer can generate pure high-frequency narrow-beam ultrasonic wave in the high-temperature specimen.