Optomechatronics

The optomechatronics group at ISYS is placed on the interface of mechatronics and optics. So we are basically concerned with modeling, simulation, control and optimization of mechatronic devices used within optical systems. For this, ISYS is cooperating with lots of partners within and outside of the university.

Owing to the accomplished progress in fabrication of optical components, modern optical systems are challenged with high requirements for image quality and minimal optical aberrations. This can only be achieved using high quality supports and links. Still, in complex systems optical aberrations are present due to many different reasons, a major one being disturbances originating from outside the system. These can often not be controlled. However, with an effective measurement and compensation schemeit is possible to mitigate the effect of the disturbance seen at the output of the optical system, which is most often the image and its quality. Modeling and control of dynamic systems form the basis for these concepts. At the Institute for System Dynamics, optomechatronic devices are modeled, followed by a feasible control design. The disturbances are estimated from measurements and used as inputs for the active and actuated optical components. Our research aims at exploiting the potential of today's integrated optical systems even more and thus increase the overall optical performance of these systems.

Research projects
Modeling and Control of deformable mirrors
  • Distributed parameters model
  • Modal profile control
  • Increasing the bandwidth of adaptive optics systems
  • Mainly used in Astronomy
    Other applications are medical technology, microscopy and communication technology
Disturbance rejection for Extremely Large Telescopes
  • Design of model based and model free filter for disturbance estimation
  • Control of optomechatronic compensation devices (mirrors)
  • Integrated simulation for quantifying the effect of single components and subsystems for the image quality
High precision control of an optica measurement machine
  • Modeling errors can be traced back mainly to friction effects in the precision machines
  • Modeling friction using the elasto-plastic friction model
  • Design of a friction estimator and the respective feedforward and feedback controller
  • Consideration of dynamic coupling for machines with multiple axes
Beam forming and disturbance compensation for laser resonators
  • Use of adaptive Optics to compensate internal disturbances of the laser resonator, which have a hugh effect on beam quality and efficiency of the resonator
  • Disturbances occur mainly within the laser active medium
  • Additionally arbitrary mode shape shall be accomplished, also known as "Design modes"
Student Thesis

We are always looking for motivated students, which are willing to be part in one of our projects for their thesis project. Typical topics include:

  • Modeling of (opto-)mechatronic parts using distributed as well as concentrated parameter models
  • Methods of signal processing
  • Methods for parameter and state estimation
  • Design and comparison of control strategies for (opto-)mechatronic systems

Please get in touch with our group members, if you are interested in these topics and get further information.

 

Publications of the Optomechatronics group
Journal Papers
  • M. Böhm, J.-U. Pott, M. Kürster, O. Sawodny, D. Defrère & P. Hinz, “Delay Compensation for Real Time Disturbance Estimation at Extremely Large Telescopes”, IEEE Transactions on Control Systems Technology, 2016, doi:10.1109/TCST.2016.2601627
  • M. Böhm, J.-U. Pott & O. Sawodny, “Real Time Vibration Compensation for Large Telescopes”, Monthly Notices of the Royal Astronomical Society, 442, pp. 2446-2455, 2014, doi:10.1093/mnras/stu1012
  • A. Keck, M. Böhm, K. Knierim, O. Sawodny, M. Gronle, W. Lyda & W. Osten, “Multisensorisches Messsystem zur dreidimensionalen Inspektion technischer Oberflächen”, tm - Technisches Messen, 81, pp. 280-288, 2014, doi:10.1515/teme-2014-0402
  • T. Ruppel, S. Dong, F. Rooms, W. Osten & O. Sawodny, “Feedforward Control of Deformable Membrane Mirrors for Adaptive Optics”, IEEE Transactions on Control Systems Technology, 21, pp. 579-589, 2013, doi:10.1109/TCST.2012.2186813
  • J. Zimmermann, O. Sawodny, W. Lyda & W. Osten, “A Control System for Automated Multiscale Measuring systems”, Mechatronics, 22, pp. 338-348, 2012, doi:10.1016/j.mechatronics.2011.11.003
  • T. Ruppel, W. Osten & O. Sawodny, “Model-based feedforward control of large deformable mirrors”, European Journal of Control, 3, pp. 261-272, 2011, doi:10.3166/ejc.17.261-272
  • A. Burla, W. Lyda, W. Osten, J. Regin, E. Westkämper, J. Zimmermann & O. Sawodny, “Verlässlichkeitsanalayse von Indikatorfunktionen in einem Automatisierten Multiskalen Meßsystem”, tm - Technisches Messen, 77, pp. 493-499, 2010, doi:10.1524/teme.2010.0033
Conference Papers
  • M. Böhm, J.-U. Pott, J. Borelli, P. Hinz, D. Defrère, E. Downey, J. Hill, K. Summers, A. Conrad, M. Kürster, T. Herbst & O. Sawodny, “OVMS-plus at the LBT. Disturbance compensation simplified.”, SPIE Conference on Astronomical Telescopes and Instrumentation, Edinburgh, UK, 2016, pp. 99062R, doi:10.1117/12.2231268
  • M. Glück, J.-U. Pott & O. Sawodny, “Simulation of an Accelerometer-based Feedforward Vibration Suppression in an Adaptive Optics System for MICADO”, SPIE Conference on Astronomical Telescopes and Instrumentation, Edinburgh, UK, 2016, doi:10.1117/12.2231852
  • A. Keck, J.-U. Pott & O. Sawodny, “Accelerometer-based online reconstruction of fast telescope vibrations from delayed measurements”, SPIE Conference on Astronomical Telescopes and Instrumentation, Edinburgh, UK, 2016, doi:10.1117/12.2231667
  • A. Keck, O. Sawodny, M. Gronle, T. Haist & W. Osten, “Active Compensation of Dynamic Errors in a Coordinate-Measuring Machine”, 7th IFAC Symposium on Mechatronic Systems & 15th Mechatronics Forum International Conference, Loughborough, UK, 2016
  • M. Böhm & O. Sawodny, “Optimal sensor placement for modal based estimation of deformable mirror shape”, IEEE Conference on Control Applications (CCA), Sydney, Australia, 2015, pp. 418-423, doi:10.1109/CCA.2015.7320665
  • A. Keck, J.-U. Pott & O. Sawodny, “Accelerometer-based online reconstruction of vibrations from delayed measurements”, IEEE Conference on Control Applications (CCA), Sydney, NSW, Australia, 2015, doi:10.1109/CCA.2015.7320666
  • M. Böhm, J.-U. Pott, O. Sawodny, T. Herbst & M. Kürster, “Real Time Estimation of Differential Piston at the LBT”, SPIE Conference on Astronomical Telescopes and Instrumentation, Montreal, Canada, 2014, doi:10.1117/12.2055833
  • A. Keck, J.-U. Pott & O. Sawodny, “Accelerometer-based position reconstruction for the feedforward compensation of fast telescope vibrations in the E-ELT/MICADO”, SPIE Conference on Astronomical Telescopes and Instrumentation, Montreal, Canada, 2014, doi:10.1117/12.2053769
  • A. Keck, J.-U. Pott & O. Sawodny, “Accelerometer-based online reconstruction of vibrations in extremely large telescopes”, IFAC World Congress, Cape Town, South Africa, 2014, pp. 7467-7473, doi:10.3182/20140824-6-ZA-1003.00265
  • A. Keck & O. Sawodny, “Automation and control of a multi-sensor measuring system for quality inspection of technical surfaces”, International Conference on Control, Automation, Robotics & Vision (ICARCV), Singapore, 2014, doi:10.1109/ICARCV.2014.7064319
  • A. Keck, J. Zimmermann & O. Sawodny, “Friction parameter identification and compensation using the elastoplastic friction model”, Annual Meeting of the American Society for Precision Engineering, Boston, MA, USA, 2014
  • M. Böhm, J. Pott, M. Kürster & O. Sawodny, “Modeling and Identification of the Optical Path at ELTs – a Case Study at the LBT”, IFAC Symposium on Mechatronic Systems, Hangzhou, China, 2013, pp. 249-255, doi:10.3182/20130410-3-CN-2034.00014
  • A. Keck, J.-U. Pott & O. Sawodny, “An accelerometer based dual loop approach to minimize the impact of fast telescope vibrations seen by the E-ELT/MICADO wavefront sensors”, Adaptive Optics for Extremely Large Telescopes Conference (AO4ELT), Florence, Italy, 2013
  • M. Böhm, T. Ruppel, J.-U. Pott, O. Sawodny, T. Herbst & M. Kürster, “Modelling the optical pathway of the Large Binocular Telescope”, SPIE Conference on Astronomical Telescopes and Instrumentation, Amsterdam, Netherlands, 2012, doi:10.1117/12.926293
  • A. Keck, J.-U. Pott, T. Ruppel & O. Sawodny, “Development of new concepts to minimize the impact of fast telescope vibrations seen by the E-ELT/MICADO wavefront sensors”, SPIE Conference on Astronomical Telescopes and Instrumentation, Amsterdam, Netherlands, 2012, doi:10.1117/12.927030
  • W. Lyda, A. Burla, T. Haist, J. Zimmermann, W. Osten & O. Sawodny, “Automated Multi-Scale Measurement System for MEMS-Characterization”, SPIE Conference on Optical Micro- and Nanometrology, 2010, doi:10.1117/12.853819
  • T. Ruppel, S. Oliver & O. Wolfgang, “Actuator placement for minimum force modal control of continuous faceplate deformable mirrors”, IEEE Conference on Control Applications (CCA), Yokohama, Japan, 2010, pp. 867-872, doi:10.1109/CCA.2010.5611311
  • J. Zimmermann, S. Oliver, L. Wolfram & O. Wolfgang, “Model-Based Control of a High-Precision Measurement Machine for Multiscale Inspection Tasks: in Preprints of the 5th IFAC Symposium on Mechatronic Systems”, IFAC Symposium on Mechatronic Systems, Cambridge, MA, USA, 2010
  • A. Burla, J. Regin, W. Lyda, J. Zimmerman, W. Osten, E. Westkämper & O. Sawodny, “Relibility Analysis of Indicator Functions in an Automated Multiscale Measuring System”, Opto, Nürnberg, Germany, 2009
  • T. Ruppel, M. Lloyd-Hart, D. Zanotti & O. Sawodny, “Modal Trajectory Generation for Adaptive Secondary Mirrors in Astronomical Adpative Optics”, IEEE Conference on Automation Science and Engineering, Scottsdale, USA, 2007, pp. 430-435, doi:10.1109/COASE.2007.4341799
  • J. Zimmermann & O. Sawodny, “Modeling for Simulation and Control of a X-Y High Precision Positioning Table”, IEEE Conference on Automation Science and Engineering, Scottsdale, USA, 2007, pp. 1093-1097, doi:10.1109/COASE.2007.4341750
  • J. Zimmermann & O. Sawodny, “Modelling and Control of a X-Y-Fine Positioning Table”, Ilmenauer Wissenschafliches Kolloquium (IWK), 2007
  • J. Zimmermann, O. Sawodny, T. Hausotte & G. Jäger, “Friction Modelling for Control of a Linear High Prescision Actuator”, IFAC Symposium on Mechatronic Systems, Heidelberg, Germany, 2006, pp. 461-466, doi:10.3182/20060912-3-DE-2911.00081
  • J. Zimmermann, O. Sawodny, T. Hausotte & G. Jäger, “Friction modelling of a linear high-precision actuator”, IFAC World Congress , Prague, Czech Republic, 2005, pp. 3309-3314, doi:10.3182/20050703-6-CZ-1902.01201
Other Publications
  • M. Böhm, J.-U. Pott & O. Sawodny, “Störgrößenkompensation im optischen Pfad von Riesenteleskopen mittels aktiver Optik”, 2013

 

Members of the Optomechatronics group
Dipl.-Ing. Michael Böhm mailto icon michael.boehm
Dipl.-Ing. Martin Glück mailto icon martin.glueck
Dipl.-Ing. Alexander Keck mailto icon alexander.keck
Dipl.-Ing. Kevin Schmidt mailto icon philipp.wittmuess
Dipl.-Ing. Philipp Wittmüß mailto icon philipp.wittmuess