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Proceedings Paper

Control architectures of galvanometer-based scanners for an increased precision and a faster response
Author(s): Corina Mnerie; Stefan Preitl; Virgil-Florin Duma
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Paper Abstract

High-end biomedical applications, such as Optical Coherence Tomography (OCT) or Confocal Microscopy (CM) require both precision and speed. The latter is essential in OCT by example to achieve in vivo, real time imaging – with video rate imaging capability. An essential element of this effort to achieve such speeds in OCT by example is the optomechatronic system used for lateral scanning. It usually consists of a dual axis double galvanometer-based scanner (GS). However, GSs are used in a larger variety of applications in biomedical imaging – not only in lateral scanning. Due to the importance of the topic, we have approached different aspects of GSs technology, including scanning and control functions, duty cycle optimization, and minimization of artifacts. The paper proposes a Model-based Predictive Control (MPC) structure for driving the GSs in order to achieve either an improved precision or a higher speed. The predictive control solution was tested for different types of input signals. Reasons for choosing the objective function and the predictive horizons are discussed. The GS was characterized by a second order mathematical model (MM), with the values of the parameters identified experimentally. Simulations were carried out using Matlab Simulink. The control results achieved are compared with the Proportional Integrative Derivative controller with Lags (PID-L1). The conclusions support the proposed control solution and its implementation in applications.

Paper Details

Date Published: 14 January 2014
PDF: 7 pages
Proc. SPIE 8925, Fifth International Conference on Lasers in Medicine: Biotechnologies Integrated in Daily Medicine, 89250O (14 January 2014); doi: 10.1117/12.2043034
Show Author Affiliations
Corina Mnerie, 3OM Optomechatronics Group, Aurel Vlaicu Univ. of Arad (Romania)
Stefan Preitl, Politehnica Univ. of Timisoara (Romania)
Virgil-Florin Duma, 3OM Optomechatronics Group, Aurel Vlaicu Univ. of Arad (Romania)


Published in SPIE Proceedings Vol. 8925:
Fifth International Conference on Lasers in Medicine: Biotechnologies Integrated in Daily Medicine
Carmen Todea; Adrian Gh. Podoleanu; Virgil-Florin Duma, Editor(s)

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