Abstract
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.
Highlights
Several techniques have been developed so far, to detect and monitor the amplitude and the frequency of the displacement of vibrating systems
Light emission diodes (LED) were, for instance, used to measure the bending and torsional vibrations of pipes [10–12]: the pipe is located between a projector and a receiver to create a shaded area on the receiver
The feasibility of a vibrometer based on the shift of the optical modes of a magnetorheological optical resonator was demonstrated analytically and experimentally
Summary
Several techniques have been developed so far, to detect and monitor the amplitude and the frequency of the displacement of vibrating systems. By comparing the Doppler frequency between the source beam and the backscattered light [3], it is possible to determine the vibrating characteristics of the tested object. Other optical methods have been developed to determine the displacement of vibrating objects.
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