Phased laser diode array permits selective excitation of ultrasonic guided waves in coated bone-mimicking tubes

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http://hdl.handle.net/10138/308105

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Moilanen , P , Salmi , A , Kilappa , V , Zhao , Z , Timonen , J & Haeggström , E 2017 , ' Phased laser diode array permits selective excitation of ultrasonic guided waves in coated bone-mimicking tubes ' , Journal of Applied Physics , vol. 122 , no. 14 , 144901 . https://doi.org/10.1063/1.5007224

Title: Phased laser diode array permits selective excitation of ultrasonic guided waves in coated bone-mimicking tubes
Author: Moilanen, Petro; Salmi, Ari; Kilappa, Vantte; Zhao, Zuomin; Timonen, Jussi; Haeggström, Edward
Contributor organization: Department of Physics
Date: 2017-10-14
Language: eng
Number of pages: 6
Belongs to series: Journal of Applied Physics
ISSN: 0021-8979
DOI: https://doi.org/10.1063/1.5007224
URI: http://hdl.handle.net/10138/308105
Abstract: This paper validates simulation predictions, which state that specific modes could be enhanced in quantitative ultrasonic bone testing. Tunable selection of ultrasonic guided wave excitation is useful in non-destructive testing since it permits the mediation of energy into diagnostically useful modes while reducing the energy mediated into disturbing contributions. For instance, it is often challenging to distinguish and extract the useful modes from ultrasound signals measured in bone covered by a soft tissue. We show that a laser diode array can selectively excite ultrasound in bone mimicking phantoms. A fiber-coupled diode array (4 elements) illuminated two solid tubes (2-3mm wall thickness) embraced by an opaque soft-tissue mimicking elastomer coating (5mm thick). A predetermined time delay matching the selected mode and frequency was employed between the outputs of the elements. The generated ultrasound was detected by a 215 kHz piezo receiver. Our results suggest that this array reduces the disturbances caused by the elastomer cover and so pave way to permit non-contacting in vivo guided wave ultrasound assessment of human bones. The implementation is small, inexpensive, and robust in comparison with the conventional pulsed lasers. Published by AIP Publishing.
Subject: 114 Physical sciences
Peer reviewed: Yes
Rights: cc_by_nc_sa
Usage restriction: openAccess
Self-archived version: publishedVersion


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