Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics

Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics

Experimental results on deep subwavelength resolution of defects are presented for the first time in the context of guided ultrasonic wave inspection of defects, using novel “structured channel” metamaterials. An Aluminum bar with side-drilled holes is used as a test sample, interrogated by the fund...

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Main Authors: John K. Birir, Michael J. Gatari, Prabhu Rajagopal
Format: Article
Language:English
Published: AIP Publishing LLC 2020-06-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.5143696
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spelling doaj-dfe86e9d214548bba07d6ee24564b1272020-11-25T03:45:23ZengAIP Publishing LLCAIP Advances2158-32262020-06-01106065027065027-410.1063/1.5143696Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonicsJohn K. Birir0Michael J. Gatari1Prabhu Rajagopal2Institute of Nuclear Science and Technology, College of Architecture and Engineering, University of Nairobi, P.O Box 30197, 00100 Nairobi, KenyaInstitute of Nuclear Science and Technology, College of Architecture and Engineering, University of Nairobi, P.O Box 30197, 00100 Nairobi, KenyaCenter for Nondestructive Evaluation and Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600036 Tamil Nadu, IndiaExperimental results on deep subwavelength resolution of defects are presented for the first time in the context of guided ultrasonic wave inspection of defects, using novel “structured channel” metamaterials. An Aluminum bar with side-drilled holes is used as a test sample, interrogated by the fundamental bar-guided symmetric mode. Simulations were conducted to optimize dimensional parameters of the metamaterial structure. Experiments using metamaterials fabricated accordingly demonstrate a resolution down to 1/72 of the operating wavelength, potentially bringing the resolution of guided wave inspection to the same range as that of bulk ultrasonics. This work has much promise for remote inspection in industry and biomedicine.http://dx.doi.org/10.1063/1.5143696
collection DOAJ
language English
format Article
sources DOAJ
author John K. Birir
Michael J. Gatari
Prabhu Rajagopal
spellingShingle John K. Birir
Michael J. Gatari
Prabhu Rajagopal
Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics
AIP Advances
author_facet John K. Birir
Michael J. Gatari
Prabhu Rajagopal
author_sort John K. Birir
title Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics
title_short Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics
title_full Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics
title_fullStr Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics
title_full_unstemmed Structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics
title_sort structured channel metamaterials for deep sub-wavelength resolution in guided ultrasonics
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2020-06-01
description Experimental results on deep subwavelength resolution of defects are presented for the first time in the context of guided ultrasonic wave inspection of defects, using novel “structured channel” metamaterials. An Aluminum bar with side-drilled holes is used as a test sample, interrogated by the fundamental bar-guided symmetric mode. Simulations were conducted to optimize dimensional parameters of the metamaterial structure. Experiments using metamaterials fabricated accordingly demonstrate a resolution down to 1/72 of the operating wavelength, potentially bringing the resolution of guided wave inspection to the same range as that of bulk ultrasonics. This work has much promise for remote inspection in industry and biomedicine.
url http://dx.doi.org/10.1063/1.5143696
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AT michaeljgatari structuredchannelmetamaterialsfordeepsubwavelengthresolutioninguidedultrasonics
AT prabhurajagopal structuredchannelmetamaterialsfordeepsubwavelengthresolutioninguidedultrasonics
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