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Proceedings Paper

Noncontact measurement of elasticity using optical fiber-based heterodyne interferometer and laser ultrasonics
Author(s): Jonghyun Eom; Soongho Park; Jinwoo Lee; Byeong Ha Lee
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Paper Abstract

We propose the noncontact measurement of elasticity by using an optical fiber heterodyne interferometer and laser ultrasonics. The surface acoustic wave (SAW), that is generated by the laser pulse irradiation on the sample surface and propagating along the surface, is optically monitored by the heterodyne interferometer without taking any contact with the sample. By taking several measurements with changing the relative distance between the excitation and the measurement points, the phase velocity of SAW was calculated and from which the elasticity of the sample could be obtained. This proposed method was experimentally evaluated by using PDMS samples having various mixing ratio of curing agent and PDMS. For the sample of a 12:1 mixing ratio, the phase velocity was measured as about 39.46 m/s and the Young’s modulus as about 1987 kPa. This technique is expected to detect the mechanical properties of biological tissues also.

Paper Details

Date Published: 23 April 2017
PDF: 4 pages
Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103235I (23 April 2017); doi: 10.1117/12.2267542
Show Author Affiliations
Jonghyun Eom, Korea Photonics Research Ctr. (Korea, Republic of)
Soongho Park, Gwangju Institute of Science and Technology (Korea, Republic of)
Jinwoo Lee, Gwangju Institute of Science and Technology (Korea, Republic of)
Byeong Ha Lee, Gwangju Institute of Science and Technology (Korea, Republic of)

Published in SPIE Proceedings Vol. 10323:
25th International Conference on Optical Fiber Sensors
Youngjoo Chung; Wei Jin; Byoungho Lee; John Canning; Kentaro Nakamura; Libo Yuan, Editor(s)

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