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research-article

Electromechanical Model based Design and Testing of Fiber Scanners for Endoscopy

[+] Author and Article Information
Abhijith Rajiv

Human Photonics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195
abhijith@uw.edu

Yaxuan Zhou

Human Photonics Laboratory, Department of Electrical Engineering, University of Washington, Seattle, Washington 98195
yaxuanzh@uw.edu

Jeremy Ridge

Human Photonics Laboratory, Department of Electrical Engineering, University of Washington, Seattle, Washington 98195
jsridge31@gmail.com

Per G. Reinhall

Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195
reinhall@uw.edu

Eric/J Seibel

Human Photonics Laboratory, Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195
eseibel@uw.edu

1Corresponding author.

ASME doi:10.1115/1.4040271 History: Received January 17, 2018; Revised May 03, 2018

Abstract

Forward-viewing catheters and scopes for diagnosing disease and guiding interventions in small ducts (less than 3 mm diameter) require wide-field high-quality imaging since scope tip bending is difficult and ineffective. A high-fidelity electromechanically coupled finite element model of a piezoelectric actuated resonant fiber scanner is presented which enables improvement on the general design of fiber-optic scanner geometry to increase scan frequency and field of view. Using the proposed model, parametric sweeps on the specific design variables achieved by acid etching of glass fiber are analyzed to identify their effect on scanner performance and to choose improved designs. The resulting complex fiber scanner design requires development of unique microfabrication techniques. Comparison of three model simulations and their experimental testing show that our proposed coupled model has prediction error of ≤12% with respect to experimental data, while other uncoupled models have up to 98% error. The model and microfabrication techniques presented in this paper have significance for fiber scanning-based systems in that they demonstrate reliability for model-driven design and also flexibility for fiber scanner design of complex geometries, allowing for improvement on medical imaging performance.

Copyright (c) 2018 by ASME
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