Microcontroller based closed-loop control of a 2D quasi-static/resonant microscanner with on-chip piezo-resistive sensor feedback

Research output: Contribution to book/Conference proceedings/Anthology/ReportConference contributionContributedpeer-review

Contributors

  • Richard Schroedter - , Fraunhofer Institute for Electronic Nano Systems (Author)
  • Markus Schwarzenberg - , Fraunhofer Institute for Electronic Nano Systems (Author)
  • Andre Dreyhaupt - , Fraunhofer Institute for Electronic Nano Systems (Author)
  • Robert Barth - , Fraunhofer Institute for Electronic Nano Systems (Author)
  • Thilo Sandner - , Fraunhofer Institute for Electronic Nano Systems (Author)
  • Klaus Janschek - , Chair of Automation Engineering (Author)

Abstract

In this paper we present a 2D raster scanning quasi-static/resonant micro mirror being controlled in both axes in closed-loop with on-chip piezo-resistive sensor feedback. While the resonant axis oscillates with a given frequency, the quasi-static axis allows static as well as dynamic deflection up to its eigenfrequency because of its staggered vertical comb (SVC) drive arrangement. Due to the high quality factor of the very low damped spring-masssystem, an adapted trajectory planning using jerk limitation is applied for the quasi-static axis [1]. Nevertheless, inaccuracies of the applied nonlinear micro mirror model and external disturbances lead to undesired residual oscillation in open-loop control mode. To achieve high precise and fast beam positioning, we implement a flatness-based control algorithm with feedback to on-chip piezo-resistive deflection sensors. In comparison to previous work [2, 3], we developed a micro controller setup for driving the microscanner, that is equipped with an analog Bessel filter increasing the sensor signal quality significantly. In this study we demonstrate a small size and low power micro mirror driver including high-voltage generation and a microcontroller for real-time control as well as a head circuit board for high resolution sensing. We discuss experimental results of open-loop and closed-loop control for 2D raster scanning operation. Finally, the outlook is given to the intrinsic capability to compensate temperature drifts influencing the piezo-resistive sensor signal.

Details

Original languageEnglish
Title of host publicationMOEMS and Miniaturized Systems XVI
EditorsWibool Piyawattanametha, Yong-Hwa Park
PublisherSPIE - The international society for optics and photonics
Number of pages11
ISBN (electronic)9781510606739
ISBN (print)978-1-5106-0674-6
Publication statusPublished - 2017
Peer-reviewedYes

Publication series

SeriesProceedings of SPIE - The International Society for Optical Engineering
Volume10116
ISSN0277-786X

Conference

TitleConference on MOEMS and Miniaturized Systems XVI
Duration30 January - 1 February 2017
CitySan Francisco
CountryCanada

External IDs

Scopus 85020388452
ORCID /0000-0003-3259-4571/work/142249650

Keywords

Keywords

  • 2D raster scan, atness-based closed loop control, electrostatic, micro mirror, microcontroller based mirror driver, piezo-resistive sensor, quasi-static, residual oscillation, staggered vertical comb drive