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Adaptive Servo Controller Design in an Optical Trap

[+] Author Affiliations
Kurt D. Wulff, Robert L. Clark

Duke University, Durham, NC

Daniel G. Cole

University of Pittsburgh, Pittsburgh, PA

Paper No. DETC2008-49884, pp. 759-764; 6 pages
doi:10.1115/DETC2008-49884
From:
  • ASME 2008 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 4: 20th International Conference on Design Theory and Methodology; Second International Conference on Micro- and Nanosystems
  • Brooklyn, New York, USA, August 3–6, 2008
  • Conference Sponsors: Design Engineering Division and Computers in Engineering Division
  • ISBN: 978-0-7918-4328-4 | eISBN: 0-7918-3831-5
  • Copyright © 2008 by ASME

abstract

Optical traps are an important tool in biophysics, which are capable of measuring forces on the the order of piconewtons and displacements on the order of nanometers. When being used as a probe, objects confined in optical traps are subjected to a broad-band thermal noise source known as Brownian motion. Closed loop control offers a method for reducing the magnitude of these disturbances, but controller design is a difficult and time consuming process. Even after a controller has been constructed, changes in the trapping power or changes between particles will change the plant dynamics and ultimately affect how well the controller performs. For these reasons, presented here is a method of designing an adaptive controller which automatically identifies the plant and actuator dynamics and designs a corresponding controller for disturbance rejection. The controller design is easily implemented on any digital control system.

Copyright © 2008 by ASME

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