Abstract
The resonance excitation of an optical fiber actuated by a conductive wire is studied in this paper. A novel approach based on exciting the micro-cantilever fiber at a location close to its base is proposed for this purpose. Analytical modeling is conducted on the mechanical models of this system in order to predict its behavior. The continuous Euler-Bernoulli beam equation with the effect of surrounding fluid medium is formulated as a boundary value problem. The natural frequencies of the system and its harmonic response are expanded analytically, and results are verified using Finite Element analysis. The obtained analytical solutions are used to draw conclusions on the response of the system and suggestions to optimize its performance are presented. In order to verify the idea in practice, an experimental setup that can closely resemble the system under consideration is made in the laboratory and its response to a periodic input with different frequencies are recorded. Comparison between the results of analytical formulation and experimental observations highlights the effectiveness of suggested technique in resonance vibration of optical fibers.
Highlights
Optical fibers are widely used in various applications in high-tech industries such as telecommunication
If the frequency of the vibration is matching the natural frequency of the system, resonance occurs and can increase the deflations in the micro-cantilever substantially
An analytical model was presented to find the natural frequencies of the system, mode shapes and its harmonic response, taking into account the effect of surrounding fluid
Summary
Optical fibers are widely used in various applications in high-tech industries such as telecommunication. Scanning fiber endoscopy is one of the emerging areas for using fiber optics in advanced applications for bio-medical image acquisition purpose [1,2,3] In this method, optical fiber is used as a micro-cantilever vibrating at relatively high frequencies. Most importantly the time constants of each actuator or in other words their ability to go through the required cycles can determine advantage of one technique over other Other considerations such as feasibility of fabrication, energy/power consumption and long term durability can be critical factors on making decision on the source of actuation for resonance vibration. Grigorov [24] fabricated a monolithic micro-cantilever, actuator and conductive material system where the higher resistance in actuators results in heat generation and thermal expansion contraction Their procedure was close to the base excitation idea explored here. In the current application it is necessary to fabricate the optical fiber separately (for optical performance) and design a separate actuator system and attach it to the pre-made fiber
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