Sketch of a mirror telescope

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

  • Design of model-based feedback controllers for disturbance compensation
  • Design of model-based and model-free filters for disturbance feedforward control
  • Control of optomechatronic compensation devices (mirrors)
  • Integrated simulation characterizing the image quality
  • Further informations
Main-structure of the Extremely Large Telescope
Main-structure of the Extremely Large Telescope
  • 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"
  • Further informations

 

Beam forming and disturbance compensation for laser resonators
Beam forming and disturbance compensation for laser resonators
  • Modeling and compensation of dynamic errors due to higher acceleration forces
  • Multi-rate multi-sensor fusion (optical sensor and axes encoders)
  • Model-based trajectory distribution for redundant drive axes
  • Further informations

 

Mahr MFU 100
Mahr MFU 100
  • 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
  • Further informations

 

Mirror-modes
Mirror-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

  • Corcione E, Pfezer D, Hentschel M, Giessen H, Tarín C. Machine Learning Methods of Regression for Plasmonic Nanoantenna Glucose Sensing. Sensors. 2022; 22(1):7. https://doi.org/10.3390/s22010007
  • P. L. Neureuther, K. Schmidt, T. Bertram & O. Sawodny, “Control oriented modelling and modal analysis of the deformable mirror M4 of the Extremely Large Telescope”, Mathematical and Computer Modelling of Dynamical Systems, 27, pp. 295-321, 2021, doi:10.1080/13873954.2020.1850480
  • M. Ringkowski, O. Sawodny, S. Hartlieb, T. Haist & W. Osten, “Estimating Dynamic Positioning Errors of Coordinate Measuring Machines”, Mechatronics, 2020, doi:10.1016/j.mechatronics.2020.102383
  • K. Schmidt, F. Beirow, M. Böhm, T. Graf, M. A. Ahmed & O. Sawodny, “Towards Adaptive High-Power Lasers: Model-Based Control and Disturbance Compensation Using Moving Horizon Estimators Mechatronics”, Mechatronics, 2020, doi:10.1016/j.mechatronics.2020.102441
  • K. Schmidt, S. Piehler, B. Dannecker, T. Dietrich, A. Raisch, T. Graf, M. A. Ahmed & O. Sawodny, “Design of intra-cavity deformable mirrors for high-power lasers”, tm - Technisches Messen, 2019, doi:10.1515/teme-2019-0005
  • K. Schmidt, P. Wittmüß, S. Piehler, M. A. Ahmed, T. Graf & O. Sawodny, “Modeling and simulating the thermoelastic deformation of mirrors using transient multilayer models”, Mechatronics, 53, pp. 168-180, 2018, doi:10.1016/j.mechatronics.2018.06.003
  • K. Schmidt, P. Wittmüß, S. Piehler, M. A. Ahmed, T. Graf & O. Sawodny, “Modellierung optisch adressierter Spiegel für adaptive Hochleistungslaser”, at - Automatisierungstechnik, 66, pp. 506-520, 2018, doi:10.1515/auto-2018-0013
  • M. Böhm, M. Glück, A. Keck, J.-U. Pott & O. Sawodny, “Improving the performance of interferometric imaging through the use of disturbance feedforward”, J. Opt. Soc. Am. A, 34, pp. A10-A21, 2017, doi:10.1364/JOSAA.34.000A10
  • M. Glück, J.-U. Pott & O. Sawodny, “Investigations of an Accelerometer-based Disturbance Feedforward Control for Vibration Suppression in Adaptive Optics of Large Telescopes”, Publications of the Astronomical Society of the Pacific, 129, 2017, doi:10.1088/1538-3873/aa632b
  • S. Piehler, T. Dietrich, P. Wittmuess, O. Sawodny, M. A. Ahmed & T. Graf, “Deformable mirrors for intra-cavity use in high-power thin disk lasers”, Optics Express, 25, pp. 4254-4267, 2017, doi:10.1364/OE.25.004254
  • 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
  • P. Wittmuess, S. Piehler, T. Dietrich, M. A. Ahmed, T. Graf & O. Sawodny, “Numerical Modelling of Multimode Laser Resonators”, Journal of the Optical Society of America B, 33, pp. 2278-2287, 2016, doi:10.1364/JOSAB.33.002278
  • 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
  • P. L. Neureuther, T. Bertram & O. Sawodny, “A Crossover Network based Control Concept for the Tip-Tilt Rejection in the Mid-Infrared ELT Imager and Spectrograph (METIS)”, IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), Boston (virtual), 2020
  • P. L. Neureuther, T. Bertram & O. Sawodny, “An advanced SCAO control concept based on mechanical mirror modes for METIS”, SPIE Astronomical Telescopes + Instrumentation, San Diego, USA (virtual), 2020, doi:10.1117/12.2560623
  • M. Ringkowski, E. Arnold & O. Sawodny, “Optimal Reference Allocation of Dual-Stage Measuring Machines”, IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM), Boston (virtual), 2020
  • K. Schmidt, N. Inan, J. Schüle, M. Böhm, A. Kharitonov & O. Sawodny, “Minimizing observation spillover for pose control of elastic bodies using optimal sensor placement”, 21st IFAC World Congress, Berlin, Germany, 2020
  • P. L. Neureuther, T. Bertram & O. Sawodny, “A new SCAO control concept based on mechanical mirror modes for METIS”, Adaptive Optics for Extremely Large Telescopes (AO4ELT6), Québec City, Canada, 2019
  • P. L. Neureuther, K. Schmidt & O. Sawodny, “Modellierung und Modalanalyse des deformierbaren Spiegels M4 im Extremely Large Telescope”, GMA FA 1.30, Salzburg, Austria, 2019
  • M. Ringkowski & O. Sawodny, “Gaussian Process Based Multi-Rate Observer for the Dynamic Positioning Error of a Measuring Machine”, European Control Conference (ECC), Neapel, 2019
  • K. Schmidt, T. Dietrich, B. Dannecker, T. Graf, M. A. Ahmed & O. Sawodny, “On compensating thermal lensing in high-power lasers using intra-cavity deformable mirrors”, 8th IFAC Symposium on Mechatronics, Vienna, Austria, 2019
  • K. Schmidt, T. Graf, M. A. Ahmed & O. Sawodny, “Energy-optimal disturbance feedforward control for constrained deformable mirrors with thermoelastic actuation”, IEEE International Conference on Systems, Man, and Cybernetics (SMC), Bari, Italy, 2019
  • K. Schmidt, A. Raisch & O. Sawodny, “Designing pneumatically actuated deformable mirrors: control of circular plates with varying thickness”, American Control Conference (ACC), Philadelphia, USA, 2019
  • K. Schmidt & O. Sawodny, “Inversion of coupled parabolic PDEs with distributed acting inputs for feedforward controlling thermoelastic deformations”, American Control Conference (ACC), Philadelphia, USA, 2019
  • K. Schmidt & O. Sawodny, “Störgrößenkompensation und Strahlformung durch deformierbare Spiegel in Hochleistungslasern”, 53. Regelungstechnisches Kolloquium, Boppard, Germany, 2019
  • M. Böhm, M. Glück, J.-U. Pott, K. Schmidt & O. Sawodny, “Advanced control algorithms and control structures for adaptive optics systems”, Adaptive Optics: Analysis, Methods & Systems, Orlando, USA, 2018
  • M. Glück, J.-U. Pott & O. Sawodny, “The MICADO First Light Imager for ELT: Control Concept for the Derotator”, SPIE Conference on Astronomical Telescopes and Instrumentation, Austin, USA, 2018, doi:10.1117/12.2312181
  • M. Glück, J.-U. Pott & O. Sawodny, “Model Predictive Control of Multi-Mirror Adaptive Optics Systems”, IEEE Conference on Control Technology and Applications (CCTA), Kopenhagen, Dänemark, 2018, doi:10.1109/CCTA.2018.8511551
  • M. Glück, J.-U. Pott & O. Sawodny, “Disturbance Feedforward Control for Vibration Suppression in Adaptive Optics of Large Telescopes”, AO4ELT5, Puerto de la Cruz, Spanien, 2017, doi:10.26698/AO4ELT5.0064
  • 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
  • D. Defrère, P. Hinz, E. Downey, M. Böhm, W. Danchi, O. Durney, S. Ertel, J. Hill, W. Hoffmann, B. Mennesson, R. Millan-Gabet, M. Montoya, J.-U. Pott, A. Skemer, E. Spalding, J. Stone & A. Vaz, “Simultaneous Water Vapor and Dry Air Optical Path Length Measurements and Compensation with the Large Binocular Telescope Interferometer”, SPIE Conference on Astronomical Telescopes and Instrumentation, Edinburgh, UK, 2016, pp. 99071G, doi:10.1117/12.2233884
  • 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
  • M. Glück, J.-U. Pott & O. Sawodny, “Piezo-actuated vibration disturbance mirror for investigating acceleroemter-based tip-tilt reconstruction in large telescopes”, 7th IFAC Symposium on Mechatronic Systems & 15th Mechatronics Forum International Conference, Loughborough, UK, 2016, doi:10.1016/j.ifacol.2016.10.581
  • 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, doi:10.1016/j.ifacol.2016.10.672
  • 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
  • J.-U. Pott, M. Kürster, J. Trowitzsch, J. Borelli, R.-R. Rohloff, T. Herbst, M. Böhm, A. Keck, T. Ruppel & O. Sawodny, “New developments at MPIA in Heidelberg to make AO more sensitive and precise”, 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
  • J.-U. Pott, M. Kürster, J. Trowitzsch, J. Borelli, R.-R. Rohloff, T. Herbst, M. Böhm, A. Keck, T. Ruppel & O. Sawodny, “Intelligent vibration control of ELTs and large AO hardware”, SPIE Conference on Astronomical Telescopes and Instrumentation, Amsterdam, Netherlands, 2012, doi:10.1117/12.927028
  • 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, O. Sawodny & 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, O. Sawodny, L. Wolfram & O. Wolfgang, “Model-Based Control of a High-Precision Measurement Machine for Multiscale Inspection Tasks”, IFAC Symposium on Mechatronic Systems, Cambridge, MA, USA, 2010, pp. 545-551, doi:10.3182/20100913-3-US-2015.00127
  • 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
  • J. Zimmermann, J. Regin, W. Lyda, T. Wiesendanger, O. Sawodny, E. Westkämper & W. Osten, “Definition and Design of an Automated Multiscale Measuring System”, euspen International Conference, Zurich, Switzerland, 2008, pp. 425-430
  • 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 Precision 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. 133-138, doi:10.3182/20050703-6-CZ-1902.01201
  • M. Böhm, “Strategies for Disturbance Compensation at Large Telescopes”, 2017
  • P. Wittmüß, “Ansätze zur dynamischen Modellierung thermischer Aktoren in Laserresonatoren”, 2017
  • M. Böhm, J.-U. Pott & O. Sawodny, “Störgrößenkompensation im optischen Pfad von Riesenteleskopen mittels aktiver Optik”, 2013
  • T. Ruppel, “Modellbasierter Reglerentwurf für verformbare Membranspiegel in der adaptiven Optik”, 2012

Members of the Optomechatronics Group

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