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A Vibrometer Based on Magnetorheological Optical Resonators

1
Mechanical and Industrial Engineering Department, University of Wisconsin Platteville, Platteville, WI 53818, USA
2
Mechanical Engineering Department, Southern Methodist University, Dallas, TX 75275, USA
*
Author to whom correspondence should be addressed.
Vibration 2018, 1(2), 239-249; https://doi.org/10.3390/vibration1020017
Received: 23 August 2018 / Revised: 21 September 2018 / Accepted: 9 October 2018 / Published: 17 October 2018
This paper addresses the feasibility of an optical vibrometer that is based on the shift of the optical modes, also known as whispering gallery modes (WGMs), of a magnetorheological optical resonator. The optical resonator that is used in this study is fabricated by mixing polyvinyl chloride plastisol with magnetically polarizable particles. When a permanent magnet that is located nearby the optical resonator is moved, it induces a perturbation of the morphology of the resonator, due to the magnetostrictive effect. This change in the morphology induces a shift in the optical modes of the resonator. The shift of the optical modes can be related to the displacement of the permanent magnet. The proposed sensor concept is based on monitoring the displacement of a tiny magnet that is attached to a moving surface. The optical quality factor of the resonator used in these studies was of the order of 106. The experimental results show a sensitivity of 0.32 pm/μm and a resolution that is less than 300 nm. View Full-Text
Keywords: vibrometer; magnetorheological; optical resonator; composites; smart materials; whispering gallery modes vibrometer; magnetorheological; optical resonator; composites; smart materials; whispering gallery modes
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Rubino, E.; Ioppolo, T. A Vibrometer Based on Magnetorheological Optical Resonators. Vibration 2018, 1, 239-249.

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