Ultrasonic flow measurement using a high-efficiency longitudinal-to-shear wave mode-converting meta-slab wedge

被引：21

作者：

Piao, Chunguang ^{[1
]}

Yang, Xiongwei ^{[2
]}

Kweun, Joshua Minwoo ^{[3
]}

Kim, Hyunseok ^{[3
]}

Park, Hyungmin ^{[1
,3
]}

Cho, Seung Hyun ^{[4
]}

Kim, Yoon Young ^{[1
,3
]}

机构：

[1] Seoul Natl Univ, Inst Adv Machines & Design, 1 Gwanak Ro, Seoul 08826, South Korea

[2] Xi An Jiao Tong Univ, Sch Aerosp, State Key Lab Strength & Vibrat Mech Struct, 28 Xianning West Rd, Xian 710049, Peoples R China

[3] Seoul Natl Univ, Dept Mech & Aerosp Engn, 1 Gwanak Ro, Seoul 08826, South Korea

[4] Korean Res Inst Stand & Sci, Ctr Safety Measurement, Daejeon, South Korea

来源：

SENSORS AND ACTUATORS A-PHYSICAL | 2020年 / 310卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Ultrasound; Transducer; Flowmeter; Metamaterial; Mode-conversion; Wedge; VIBRATION CHARACTERISTICS; FLOWMETER; TRANSDUCER;

D O I：

10.1016/j.sna.2020.112080

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A non-invasive ultrasonic flowmeter transmits a shear wave into the wall of the pipe hosting the fluid. The shear wave is typically generated through a plastic wedge by the mode conversion of a longitudinal wave excited by a PZT element. Because of a big impedance mismatch between a plastic wedge and a metal pipe, however, conversion efficiency is not high. In this study, we propose a novel metal wedge equipped with an elaborately-designed mode-converting metamaterial slab and show that the designed wedge can fully transmit longitudinal-to-shear mode converted waves into a metal pipe. The design principle and mode-conversion efficiency of the meta-slab wedge and experimental results are presented. The designed meta-slab wedge was used for experiments performed with a water-flowing rectangular pipe and the flow velocity measurement sensitivity with it was increased several times compared with that based on a conventional wedge. Through this study, a metamaterial wedge is found to be a useful alternative to improve mode-converting transmission efficiency in ultrasonic applications. (C) 2020 Elsevier B.V. All rights reserved.

引用

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