Dr. Lorenzo Zago Profile

Dr. Lorenzo Zago

Professor

SPIE Involvement:

Author

Area of Expertise:

optomechatronics , systems engineering , optical metrology

Websites:

Company Website | Personal Website

Profile Summary

Born 1949 in Basel Switzerland. Dual Swiss and Italian nationality.
1973: degree in aeronautical engineering, Politecnico di MIlano, Italy.
1995: PhD, EPFL, Lausanne, Switzerland.
1985-1993: ESO on the VLT enclosures, infrastructures and environmental effects (seeing, wind).
1995-2007: CSEM, mainly in charge of high precision optomechatronics projects for space and astrophysical applications.
2007- : Professor for optics and metrology at University of Applied Sciences Western Switzerland.

Publications (27)

Proceedings Article | 30 August 2022 Paper

Paper

INO340 Telescope end-to-end simulations and performance analysis

Asghar Jafarzadeh, Ruhollah Sadeghi-Amin, Lorenzo Zago, Reza Ravanmehr, Habib Khosroshahi, Mohammadreza Rostamian

Proceedings Volume 12187, 121870U (2022) https://doi.org/10.1117/12.2628850

KEYWORDS: Telescopes, Device simulation, Computer programming, Control systems, MATLAB, Observatories, Head, Laser range finders, Image quality, Turbulence

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Proceedings Article | 10 July 2018 Paper

Paper

Highly integrated versatile motion control units

Leszek Lisowski, Lorenzo Zago

Proceedings Volume 10706, 107062W (2018) https://doi.org/10.1117/12.2313201

KEYWORDS: Control systems, Digital signal processing, Motion controllers, Actuators, Amplifiers, Interfaces, Electronics, Position sensors, Software development, Intelligence systems

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Proceedings Article | 19 August 2016 Paper

Paper

Project management of DAG: Eastern Anatolia Observatory

Onur Keskin, Cahit Yesilyaprak, Sinan Yerli, Lorenzo Zago, Tolga Guver, Sinan Alis

Proceedings Volume 9911, 99110S (2016) https://doi.org/10.1117/12.2234459

KEYWORDS: Telescopes, Observatories, Optical instrument design, Adaptive optics, Telescopes, Observatories, Mirrors, Space telescopes, Imaging spectroscopy, Astronomy, Monochromatic aberrations, Spectroscopes

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Proceedings Article | 9 August 2016 Paper

Paper

Integrated opto-dynamic modeling of the 4m DAG telescope image quality performance

Lorenzo Zago, Benjamin Guex, Cahit Yesilyaprak, Sinan Yerli, Onur Keskin

Proceedings Volume 9911, 991128 (2016) https://doi.org/10.1117/12.2232816

KEYWORDS: Integrated modeling, Space telescopes, Telescopes, Performance modeling, Integrated modeling, Image quality, Mirrors, Systems modeling, Finite element methods, Data modeling, Aerodynamics

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Proceedings Article | 8 August 2016 Paper

Paper

Agile development approach for the observatory control software of the DAG 4m telescope

B. Bülent Güçsav, Deniz Çoker, Cahit Yeşilyaprak, Onur Keskin, Lorenzo Zago, Sinan Yerli

Proceedings Volume 9913, 991333 (2016) https://doi.org/10.1117/12.2234394

KEYWORDS: Observatories, Telescopes, Control systems design, Software development, Active optics, Control systems, Human-machine interfaces, Interfaces, Data storage, Computer programming

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Proceedings Article | 27 July 2016 Paper

Paper

The design of an adaptive optics telescope: the case of DAG

Laurent Jolissaint, Onur Keskin, Lorenzo Zago, Sinan Kaan Yerli, Cahit Yesilyaprak, Emeric Mudry, Grégory Lousberg

Proceedings Volume 9906, 99063J (2016) https://doi.org/10.1117/12.2233297

KEYWORDS: Telescopes, Telescopes, Adaptive optics, Active optics, Optical instrument design, Wavefronts, Mirrors, Space telescopes, Sensors, Monochromatic aberrations, Error analysis

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Proceedings Article | 28 July 2014 Paper

Paper

Metrology system for the calibration of multi-dof mechanisms

Lorenzo Zago, Mirsad Sarajlic, Fabien Chevalley

Proceedings Volume 9151, 91513V (2014) https://doi.org/10.1117/12.2057673

KEYWORDS: Metrology, Calibration, Cameras, Telescopes, Mirrors, Precision measurement, Imaging systems, Precision calibration, Astronomy, Optomechanical design

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Proceedings Article | 22 July 2014 Paper

Paper

Turkey's next big science project: DAG the 4 meter telescope

O. Keskin, C. Yesilyaprak, S. Yerli, L. Zago, L. Jolissaint

Proceedings Volume 9145, 914547 (2014) https://doi.org/10.1117/12.2067599

KEYWORDS: Telescopes, Mirrors, Adaptive optics, Space telescopes, Point spread functions, Optical instrument design, Monochromatic aberrations, Wavefronts, Sensors, Optical design

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Proceedings Article | 25 September 2012 Paper

Paper

Dynamic analysis of the active control system for the CGST

Yichun Dai, Dehua Yang, Lorenzo Zago, Zhong Liu

Proceedings Volume 8449, 84491A (2012) https://doi.org/10.1117/12.925930

KEYWORDS: Mirrors, Telescopes, Control systems, Solar telescopes, Control systems design, Actuators, Segmented mirrors, Sensing systems, Device simulation, Optical instrument design

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Proceedings Article | 13 September 2012 Paper

Paper

Metrology system for the calibration of multi-dof precision mechanisms

Lorenzo Zago, Mirsad Sarajlic, Fabien Chevalley, Dehua Yang

Proceedings Volume 8450, 845039 (2012) https://doi.org/10.1117/12.925710

KEYWORDS: Cameras, Metrology, Mirrors, Calibration, Imaging systems, Telescopes, Autocollimators, Motion measurement, Precision calibration, Astronomical telescopes

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Proceedings Article | 10 November 2011 Paper

Paper

Integrated modeling analysis of a novel hexapod and its application in active surface

Dehua Yang, Lorenzo Zago, Hui Li, Gregory Lambert, Guohua Zhou, Guoping Li

Proceedings Volume 8336, 83360L (2011) https://doi.org/10.1117/12.915936

KEYWORDS: Actuators, Kinematics, Finite element methods, Error analysis, Integrated modeling, 3D modeling, Prototyping, Systems modeling, MATLAB, Radio telescopes

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Proceedings Article | 28 July 2008 Paper

Paper

The ESPRI Project: differential delay lines for PRIMA

F. Pepe, Didier Queloz, Th. Henning, A. Quirrenbach, F. Delplancke, L. Andolfato, H. Baumeister, P. Bizenberger, H. Bleuler, B. Chazelas, F. Dérie, L. Di Lieto, T. Duc, O. Duvanel, M. Fleury, D. Gillet, U. Graser, F. Koch, R. Launhardt, C. Maire, D. Mégevand, Y. Michellod, J.-M. Moresmau, P. Müllhaupt, V. Naranjo, L. Sache, Y. Salvadé, G. Simond, D. Sosnowska, K. Wagner, L. Zago

Proceedings Volume 7013, 70130P (2008) https://doi.org/10.1117/12.788169

KEYWORDS: Actuators, Stars, Metrology, Eye, Mirrors, Telescopes, Interferometers, Exoplanets, Interferometry, Planets

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Proceedings Article | 28 July 2008 Paper

Paper

The ESPRI project: astrometric exoplanet search with PRIMA

R. Launhardt, Didier Queloz, Th. Henning, A. Quirrenbach, F. Delplancke, L. Andolfato, H. Baumeister, P. Bizenberger, H. Bleuler, B. Chazelas, F. Dérie, L. Di Lieto, T.P. Duc, O. Duvanel, N. Elias, M. Fluery, R. Geisler, D. Gillet, U. Graser, F. Koch, R. Köhler, C. Maire, D. Mégevand, Y. Michellod, J.-M. Moresmau, A. Müller, P. Müllhaupt, V. Naranjo, F. Pepe, S. Reffert, L. Sache, D. Ségransan, Y. Salvadé, T. Schulze-Hartung, J. Setiawan, G. Simond, D. Sosnowska, I. Stilz, B. Tubbs, K. Wagner, L. Weber, P. Weise, L. Zago

Proceedings Volume 7013, 70132I (2008) https://doi.org/10.1117/12.789318

KEYWORDS: Stars, Planets, Exoplanets, Astatine, Telescopes, K band, Interferometry, Software development, Interferometers, Near infrared

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Proceedings Article | 6 July 2006 Paper

Paper

A scalable pick-off technology for multi-object instruments

Peter Hastings, Suzanne Ramsay Howat, Peter Spanoudakis, Raymond van den Brink, Callum Norrie, David Clarke, K. Laidlaw, S. McLay, Johan Pragt, Hermine Schnetler, L. Zago

Proceedings Volume 6273, 62732X (2006) https://doi.org/10.1117/12.671644

KEYWORDS: Mirrors, Telescopes, Space telescopes, Motion controllers, Metrology, Cryogenics, Actuators, Control systems, Software development, Astronomy

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Proceedings Article | 6 July 2006 Paper

Paper

VISTA secondary mirror drive performance and test results

Enric Martin Geijo, Joan Manel Casalta, Manuel Canchado, Manuel San Andrés, Rafel Brú, Hector García, Albert Tomàs, Lorenzo Zago, Paul Jeffers

Proceedings Volume 6273, 627338 (2006) https://doi.org/10.1117/12.669949

KEYWORDS: Actuators, Mirrors, Telescopes, Control systems, Electronics, Computer programming, Sensors, Calibration, Electromechanical design, Control systems design

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Proceedings Article | 6 July 2006 Paper

Paper

The EMIR detector translation unit: a cryogenic high-precision 3-DoF parallel mechanism

Lorenzo Zago, Serge Droz, Livia Racz, Albert Molins

Proceedings Volume 6273, 62733L (2006) https://doi.org/10.1117/12.669656

KEYWORDS: Actuators, Sensors, Cryogenics, Kinematics, Computer aided design, Telescopes, Control systems, Capacitance, Spectrographs, Electronics

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Proceedings Article | 18 August 2005 Paper

Paper

Progress on smart focal plane technologies for extremely large telescopes

Colin Cunningham, Eli Atad, Jeremy Bailey, Fabio Bortoletto, Francisco Garzon, Peter Hastings, Roger Haynes, Callum Norrie, Ian Parry, Eric Prieto, Suzanne Howat, Juergen Schmoll, Lorenzo Zago, Frederic Zamkotsian

Proceedings Volume 5904, 59040T (2005) https://doi.org/10.1117/12.617217

KEYWORDS: Mirrors, Telescopes, Spectroscopy, Cryogenics, Astronomical imaging, Diffraction, Actuators, Large telescopes, Molybdenum, Prototyping

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Proceedings Article | 29 September 2004 Paper

Paper

The performances of the GTC secondary mirror drive unit

Joan Casalta, Joan Arino, Manuel Canchado, Enric Geijo, Albert Molins, Albert Tomas, Lorenzo Zago

Proceedings Volume 5495, (2004) https://doi.org/10.1117/12.551868

KEYWORDS: Sensors, Actuators, Mirrors, Telescopes, Control systems, Computer programming, Calibration, Position sensors, Servomechanisms, Data acquisition

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Proceedings Article | 4 February 2003 Paper

Paper

Special and innovative aspects of the GTC M2 drive mechanism

Enrique Garcia, Lorenzo Zago, Daniele Gallieni

Proceedings Volume 4837, (2003) https://doi.org/10.1117/12.458231

KEYWORDS: Actuators, Mirrors, Reliability, Telescopes, Manufacturing, Safety, Computer programming, Sensors, Control systems, Optical alignment

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Proceedings Article | 20 July 2000 Paper

Paper

Small parallel manipulator for the active alignment and focusing of the secondary mirror of the VLTI ATS

Lorenzo Zago, Serge Droz

Proceedings Volume 4003, (2000) https://doi.org/10.1117/12.391536

KEYWORDS: Actuators, Mirrors, Telescopes, Control systems, Sensors, Kinematics, System integration, Mirror pointing, Precision measurement, Observatories

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Proceedings Article | 7 July 2000 Paper

Paper

Extremely high resolution tip-tilt-piston mirror mechanism for the VLT-NAOS field selector

Peter Spanoudakis, Lorenzo Zago, O. Chetelat, Roland Gentsch, F. Mato Mira

Proceedings Volume 4007, (2000) https://doi.org/10.1117/12.390352

KEYWORDS: Mirrors, Actuators, Sensors, Silicon carbide, Control systems, Interfaces, Adaptive optics, Wavefront sensors, Electromagnetism, Position sensors

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Proceedings Article | 20 June 2000 Paper

Paper

Development and testing of a high-precision high-stiffness linear actuator for the focus-center mechanism of the SOFIA secondary mirror

Lorenzo Zago, Philippe Schwab, Daniele Gallieni

Proceedings Volume 4014, (2000) https://doi.org/10.1117/12.389116

KEYWORDS: Actuators, Mirrors, Prototyping, Telescopes, Space telescopes, Advanced distributed simulations, Manufacturing, Secondary tip-tilt mirrors, Sensors, Computer programming

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Proceedings Article | 27 April 2000 Paper

Paper

Electromechanical lever blocks for active vibration isolation

Lorenzo Zago, Pierre Genequand

Proceedings Volume 3989, (2000) https://doi.org/10.1117/12.384588

KEYWORDS: Signal attenuation, Sensors, Electromagnetism, Chemical elements, Vibration isolation, Interfaces, Actuators, Data modeling, Information operations, Optical isolators

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Proceedings Article | 25 August 1998 Paper

Paper

Extremely compact secondary mirror unit for the SOFIA Telescope capable of 6-degree-of-freedom alignment plus chopping

Lorenzo Zago, Pierre Genequand, Joseph Moerschell

Proceedings Volume 3352, (1998) https://doi.org/10.1117/12.319276

KEYWORDS: Mirrors, Telescopes, Space telescopes, Actuators, Optical instrument design, Sensors, Chemical elements, Control systems, Device simulation, Shape memory alloys

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Proceedings Article | 16 June 1998 Paper

Paper

Resistor-damped electromechanical lever blocks

Lorenzo Zago, Pierre Genequand, Ivar Kjelberg

Proceedings Volume 3327, (1998) https://doi.org/10.1117/12.310699

KEYWORDS: Actuators, Interfaces, Electromagnetism, Signal attenuation, Control systems, Optical isolators, Vibration control, Chemical elements, Resistance, Ranging

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The paper presents an innovative technical solution which provides a combined damping and isolation interface with the appropriate transmissibility characteristics between a vibrating base and a sensitive payload, typically an optical terminal/telescope. The novelty of the solution is primarily found in the implementation of uncoupling and magnification of the incurred vibrations by means of flexures combined with the implementation of energy dissipation by means of a linear electro-magnetic actuator to constitute a passive integrated resistor-damped electromechanic lever block. By means of frictionless flexible lever systems, the amplitude of the payload vibrations is adapted to the optimal range of the actuator with a magnification by a factor ranging typically between 10 and 30. Passive viscous damping is obtained by simply short-circuiting the electro-magnetic motor and can be adapted by setting the impedance of the shorting connection. The desired stiffness is provided by the passive springs of the elastic motor suspension and by the stiffness of the lever flexure blades. The mobile mass of the motors also provide a reaction mass which, like damping and stiffness, is amplified by the square of the lever factor. A theoretical model of resistor-damped electromechanical lever blocks has been established. A particular property is it the good attenuation of excited vibrations only over a set frequency range. Above this range the interface properties rejoin the ones of a rigid connection. This performance makes this type of isolators particularly suitable for integration into multi-layer vibration control systems where sensitive equipment is protected by a mix of passive and active damping/isolation devices acting optimally at different frequency ranges. Experiments performed with a dummy load (80 Kg) representative of a satellite based optical terminal demonstrated the efficiency of the system in protecting the payload by passive damping for vibration excitations of amplitude up to 0.15 mm and frequency up to about 120 Hz achieving an attenuation of the eigenmodes of the load structure by more than 20 dB.

Proceedings Article | 21 March 1997 Paper

Paper

Application of flexure structures to active and adaptive opto-mechanical mechanisms

Lorenzo Zago, Pierre Genequand, Ivar Kjelberg, Joseph Morschel

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.269023

KEYWORDS: Actuators, Mirrors, Interfaces, Kinematics, Control systems, Space operations, Manufacturing, Chemical elements, Sensors, Space telescopes

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Proceedings Article | 21 March 1997 Paper

Paper

Engineering handbook for local and dome seeing

Lorenzo Zago

Proceedings Volume 2871, (1997) https://doi.org/10.1117/12.269103

KEYWORDS: Mirrors, Telescopes, Convection, Refraction, Heat flux, Turbulence, Humidity, Optical instrument design, Astronomy, Data modeling

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Showing 5 of 27 publications

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