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

Piao, Chunguang; Yang, Xiongwei; Kweun, Joshua Minwoo; Kim, Hyunseok; Park, Hyungmin; Cho, Seung Hyun; Kim, Yoon Young

doi:10.1016/j.sna.2020.112080

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

Sensors and actuators. A, Physical, v.310, 2020년, pp.112080 -

Piao, Chunguang (Institute of Advanced Machines and Design, Seoul National University) , Yang, Xiongwei (State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi’an Jiaotong University) , Kweun, Joshua Minwoo (Department of Mechanical and Aerospace Engineering, Seoul National University) , Kim, Hyunseok (Department of Mechanical and Aerospace Engineering, Seoul National University) , Park, Hyungmin (Institute of Advanced Machines and Design, Seoul National University) , Cho, Seung Hyun (Center for Safety Measurement, Korean Research Institute of Standards and Science) , Kim, Yoon Young (Institute of Advanced Machines and Design, Seoul National University)

Abstract ▼ AI-Helper

Abstract 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. Highlights A wedge of high mode-conversion transmission is designed for ultrasonic flow measurement. The wedge is equipped with a novel anisotropic metamaterial slab. The proposed wedge increases sensitivity several times compared with traditional wedges. Graphical abstract While the maximum power transmission to a pipe wall by the conventional PEEK wedge transducer is in the order of only 30 %, the maximum power transmission by the proposed meta-slab wedge transducer can reach over 90 %. [DISPLAY OMISSION]

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DOI : 10.1016/j.sna.2020.112080
Elsevier : 저널 > 논문

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