Prof. Hans-Peter Röser Profile

Prof. Hans-Peter Röser

Deceased at Univ Stuttgart

SPIE Involvement:

Author

Publications (30)

Proceedings Article | 3 April 2018 Open Access

The infrared instrumentation of the mini-satellite mission BIRD

Eckehard Lorenz, Klaus Briess, Herbert Jahn, Hans-Peter Röser, Wolfgang Skrbek

Proceedings Volume 10570, 1057007 (2018) https://doi.org/10.1117/12.2326437

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Proceedings Article | 9 August 2016 Paper

SOFIA's secondary mirror assembly: in-flight performance and control approach

Andreas Reinacher, Yannick Lammen, Hans-Peter Roeser

Proceedings Volume 9908, 99082V (2016) https://doi.org/10.1117/12.2232851

KEYWORDS: Mirrors, Space telescopes, Telescopes, Actuators, Position sensors, Sensors, Filtering (signal processing), Linear filtering, Data modeling, Amplifiers

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The Stratospheric Observatory for Infrared Astronomy (SOFIA) is a 2.5m infrared telescope built into a Boeing 747 SP. In 2014 SOFIA reached its Full Operational Capability milestone and nowadays takes off about three times a week to observe the infrared sky from altitudes above most of the atmosphere’s water vapor content. An actively controlled 352mm SiC secondary mirror is used for infrared chopping with peak-to-peak amplitudes of up to 10 arcmin and chop frequencies of up to 20Hz and also as actuator for fast pointing corrections. The Swiss-made Secondary Mirror Mechanism (SMM) is a complex, highly integrated and compact flexure based mechanism that has been performing with remarkable reliability during recent years. Above mentioned capabilities are provided by the Tilt Chopper Mechanism (TCM) which is one of the two stages of the SMM. In addition the SMM is also used to establish a collimated telescope and to adjust the telescope focus depending on the structure’s temperature which ranges from about 40°C at takeoff in Palmdale, CA to about −40◦C in the stratosphere. This is achieved with the Focus Center Mechanism (FCM) which is the base stage of the SMM on which the TCM is situated. Initially the TCM was affected by strong vibrations at about 300 Hz which led to unacceptable image smearing. After some adjustments to the PID-type controller it was finally decided to develop a completely new control algorithm in state space. This pole placement controller matches the closed loop system poles to those of a Bessel filter with a corner frequency of 120 Hz for optimal square wave behavior. To reduce noise present on the position and current sensors and to estimate the velocity a static gain Kalman Filter was designed and implemented. A system inherent delay is incorporated in the Kalman filter design and measures were applied to counteract the actuators’ hysteresis. For better performance over the full operational temperature range and to represent an amplitude dependent non-linearity the underlying model of the Kalman filter adapts in real-time to those two parameters. This highly specialized controller was developed over the course of years and only the final design is introduced here. The main intention of this contribution is to present the currently achieved performance of the SOFIA chopper over the full amplitude, frequency, and temperature range. Therefore a range of data gathered during in-flight tests aboard SOFIA is displayed and explained. The SMM’s three main performance parameters are the transition time between two chop positions, the stability of the Secondary Mirror when exposed to the low pressures, low temperatures, aerodynamic, and aeroacoustic excitations present when the SOFIA observatory operates in the stratosphere at speeds of up to 850 km/h, and finally the closed-loop bandwidth available for fast pointing corrections.

Proceedings Article | 4 August 2014 Paper

Upgrade of the SOFIA target acquisition and tracking cameras

Jürgen Wolf, Manuel Wiedemann, Enrico Pfüller, Michael Lachenmann, Helen Hall, Hans-Peter Röser

Proceedings Volume 9145, 91450W (2014) https://doi.org/10.1117/12.2057000

KEYWORDS: Cameras, Imaging systems, Telescopes, Observatories, Stars, Mirrors, CCD image sensors, Space telescopes, CCD cameras, Computer aided design

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Proceedings Article | 18 July 2014 Paper

Evolution of the SOFIA tracking control system

Norbert Fiebig, Holger Jakob, Enrico Pfüller, Hans-Peter Röser, Manuel Wiedemann, Jürgen Wolf

Proceedings Volume 9152, 915216 (2014) https://doi.org/10.1117/12.2055278

KEYWORDS: Cameras, Imaging systems, Telescopes, Image processing, Control systems, Computing systems, Computer architecture, Signal processing, Observatories, Optical filters

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Proceedings Article | 26 September 2013 Paper

The development of the µROSI x-ray telescope

Lars Tiedemann, Elias Breunig, Vadim Burwitz, Maria Fürmetz, Gisela Hartner, Walter Kink, Benedikt Menz, Peter Predehl, Hans-Peter Röser, Martin Schlecker, Giuseppe Valsecchi

Proceedings Volume 8859, 885905 (2013) https://doi.org/10.1117/12.2023973

KEYWORDS: Sensors, Mirrors, X-rays, X-ray telescopes, Space telescopes, Electronics, Telescopes, Aluminum, Satellites, Polonium

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Proceedings Article | 27 September 2012 Paper

Active damping of the SOFIA Telescope assembly

Paul Keas, Edward Dunham, Ulrich Lampater, Enrico Pfüller, Stefan Teufel, Hans-Peter Roeser, Manuel Wiedemann, Jürgen Wolf

Proceedings Volume 8444, 844411 (2012) https://doi.org/10.1117/12.924791

KEYWORDS: Control systems, Telescopes, Actuators, Mirrors, Space telescopes, Shape memory alloys, Observatories, Optical instrument design, Motion models, Finite element methods

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Proceedings Article | 27 September 2012 Paper

Upgrade of the SOFIA target acquisition and tracking cameras

Manuel Wiedemann, Jürgen Wolf, Hans-Peter Roeser

Proceedings Volume 8444, 84442T (2012) https://doi.org/10.1117/12.925583

KEYWORDS: Cameras, Imaging systems, Telescopes, CCD image sensors, Sensors, Space telescopes, Target acquisition, Data acquisition, Head, CCD cameras

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Proceedings Article | 17 September 2012 Paper

Evaluation of the aero-optical properties of the SOFIA cavity by means of computional fluid dynamics and a super fast diagnostic camera

Christian Engfer, Enrico Pfüller, Manuel Wiedemann, Jürgen Wolf, Thorsten Lutz, Ewald Krämer, Hans-Peter Röser

Proceedings Volume 8444, 844412 (2012) https://doi.org/10.1117/12.926272

KEYWORDS: Wavefronts, Cameras, Telescopes, Mirrors, Diagnostics, Optical parametric oscillators, Space telescopes, Turbulence, Convection, Observatories

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Proceedings Article | 17 September 2012 Paper

Optical characterization of the SOFIA telescope using fast EM-CCD cameras

Enrico Pfüller, Jürgen Wolf, Helen Hall, Hans-Peter Röser

Proceedings Volume 8444, 844413 (2012) https://doi.org/10.1117/12.926367

KEYWORDS: Telescopes, Cameras, Space telescopes, Mirrors, Stars, Imaging systems, Diagnostics, Observatories, Pluto, Control systems

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Proceedings Article | 10 November 2011 Paper

Modeling of the SOFIA secondary mirror controller

Andreas Reinacher, Hans-Peter Roeser

Proceedings Volume 8336, 83360S (2011) https://doi.org/10.1117/12.915590

KEYWORDS: Actuators, Mirrors, Data modeling, Space telescopes, Observatories, Telescopes, System identification, Temperature metrology, Systems modeling, Shape memory alloys

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Proceedings Article | 10 November 2011 Paper

Pointing stability and image quality of the SOFIA Airborne Telescope during initial science missions

Ulrich Lampater, Paul Keas, Rick Brewster, Terry Herter, Juergen Wolf, Enrico Pfueller, Manuel Wiedemann, Stefan Teufel, Franziska Harms, Holger Jakob, Hans-Peter Roser

Proceedings Volume 8336, 833608 (2011) https://doi.org/10.1117/12.915762

KEYWORDS: Telescopes, Image quality, Mirrors, Space telescopes, Motion measurement, Observatories, Control systems design, Control systems, Gyroscopes, Motion estimation

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Proceedings Article | 5 August 2010 Paper

Testing the e2v CCD47-20 as the new sensor for the SOFIA target acquisition and tracking cameras

Manuel Wiedemann, Jürgen Wolf, Hans-Peter Röser

Proceedings Volume 7733, 773337 (2010) https://doi.org/10.1117/12.856284

KEYWORDS: Cameras, Imaging systems, Sensors, Quantum efficiency, Telescopes, Stars, Bismuth, Target acquisition, CCD image sensors, Device simulation

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Proceedings Article | 28 July 2010 Paper

Optical measurement of the pointing stability of the SOFIA Telescope using a fast EM-CCD camera

Enrico Pfüller, Jürgen Wolf, Hans-Peter Röser

Proceedings Volume 7733, 77330T (2010) https://doi.org/10.1117/12.857521

KEYWORDS: Telescopes, Cameras, Stars, Space telescopes, Imaging systems, Mirrors, Observatories, Diagnostics, Optical testing, Data modeling

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The goal of the Stratospheric Observatory for Infrared Astronomy (SOFIA) is to point its airborne telescope at astronomical targets stable within 0.2 arcseconds (rms). However, the pointing stability will be affected in flight by aircraft vibrations and movements and constantly changing aerodynamic conditions within the open telescope compartment. Model calculations indicate that initially the deviations from targets may be at the order of several arcseconds. The plan is to carefully analyse and characterize all disturbances and then gradually fine tune the telescope's attitude control system to improve the pointing stability. To optically measure how star images change their position in the focal plane, an Andor DU-888 electronmultiplying (EM) CCD camera will be mounted to the telescope instead of its standard tracking camera. The new camera, dubbed Fast Diagnostic Camera (FDC) has been extensively tested and characterized in the laboratory and on ground based telescopes. In ground tests on the SOFIA telescope system it proofed its capabilities by sampling star images with frame rates up to 400 frames per second. From this data the star's location (centroid) in the focal plane can be calculated every 1/400th second and by means of a Fourier transformation, the star's movement power spectrum can be derived for frequencies up to 200 Hz. Eigenfrequencies and the overall shape of the measured spectrum confirm the previous model calculations. With known disturbances introduced to the telescope's fine drive system, the FDC data can be used to determine the system's transfer function. These data, when measured in flight will be critical for the refinement of the attitude control system. Another subsystem of the telescope that was characterized using FDC data was the chopping secondary mirror. By monitoring a star centroid at high speed while chopping, the chopping mechanism and its properties could be analyzed. This paper will describe the EM-CCD camera and its characteristics and will report on the tests that lead up to its first use in a SOFIA flight.

Proceedings Article | 28 July 2010 Paper

Improvement of the SOFIA secondary mirror controller

Andreas Reinacher, Emmanuel Onillon, Hans-Peter Roeser

Proceedings Volume 7733, 77330Q (2010) https://doi.org/10.1117/12.856554

KEYWORDS: Mirrors, Data modeling, Actuators, Linear filtering, Device simulation, Telescopes, System identification, Space telescopes, Observatories, Aerodynamics

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Proceedings Article | 28 July 2010 Paper

A fast EM-CCD camera as performance monitor for the SOFIA Telescope with science capabilities

Jürgen Wolf, Hans-Peter Röser, Alfred Krabbe, Enrico Pfüller

Proceedings Volume 7733, 77330P (2010) https://doi.org/10.1117/12.856372

KEYWORDS: Telescopes, Cameras, Space telescopes, Stars, Infrared telescopes, Imaging systems, Photometry, Visible radiation, Astronomy, Diagnostics

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Proceedings Article | 28 July 2010 Paper

Preparation of the pointing and control system of the SOFIA Airborne Telescope for early science missions

Ulrich Lampater, Terry Herter, Paul Keas, Franziska Harms, Christian Engfer, Peter Salewsky, Holger Jakob, Hans-Peter Roeser

Proceedings Volume 7733, 77330S (2010) https://doi.org/10.1117/12.856562

KEYWORDS: Telescopes, Control systems, Space telescopes, Motion measurement, Control systems design, Mirrors, Observatories, Space operations, Aerodynamics, Actuators

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Proceedings Article | 9 July 2008 Paper

Improved sensitivity of the SOFIA target acquisition and tracking cameras and a high speed diagnostics camera for telescope movements in flight

Jürgen Wolf, Hans-Peter Röser, Sascha Tietz, Manuel Wiedemann, Enrico Pfüller, Dietmar Lilienthal

Proceedings Volume 7014, 701412 (2008) https://doi.org/10.1117/12.790089

KEYWORDS: Cameras, Telescopes, Imaging systems, CCD image sensors, Charge-coupled devices, CCD cameras, Sensors, Quantum efficiency, Target acquisition, Head

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Proceedings Article | 27 June 2006 Paper

GREAT: the German first light heterodyne instrument for SOFIA

Urs Graf, Stefan Heyminck, Rolf Güsten, Paul Hartogh, Heinz-Wilhelm Hübers, Karl Jacobs, Martin Philipp, David Rabanus, Hans-Peter Röser, Jürgen Stutzki, Peter van der Wal, Armin Wagner-Gentner

Proceedings Volume 6275, 62750K (2006) https://doi.org/10.1117/12.673168

KEYWORDS: Terahertz radiation, Receivers, Oscillators, Heterodyning, Spectrometers, Spectral resolution, Astronomy, Photography, Bolometers, Calibration

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Proceedings Article | 23 June 2006 Paper

On sky testing and preliminary sensor alignment for the SOFIA Telescope

Franziska Harms, Patrick Waddell, Martin Suess, Hans-Peter Roeser

Proceedings Volume 6267, 62670V (2006) https://doi.org/10.1117/12.671936

KEYWORDS: Telescopes, Gyroscopes, Space telescopes, Stars, Sensors, Calibration, Charge-coupled devices, Imaging systems, Electroluminescence, Mirrors

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Proceedings Article | 5 August 2004 Paper

Reflection properties of vegetation and soil with a new BRDF database

Maria von Schoenermark, Hans-Peter Roeser

Proceedings Volume 5431, (2004) https://doi.org/10.1117/12.540991

KEYWORDS: Bidirectional reflectance transmission function, Reflectivity, Cameras, Scattering, Satellites, Atmospheric particles, Vegetation, Sun, Atmospheric modeling, Aerosols

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Proceedings Article | 3 March 2003 Paper

GREAT: the German Receiver for Astronomy at Terahertz Frequencies

Rolf Guesten, Ivan Camara, Paul Hartogh, Heinz-Wilhelm Huebers, Urs Graf, Karl Jacobs, Christoph Kasemann, Hans-Peter Roeser, Rudolf Schieder, Gert Schnieder, Oliver Sievertz, Juergen Stutzki, Geronimo Villanueva, Armin Wagner, Peter van der Wal, Achim Wunsch

Proceedings Volume 4857, (2003) https://doi.org/10.1117/12.458820

KEYWORDS: Spectroscopy, Receivers, Astronomy, Data acquisition, Heterodyning, Oscillators, Spectroscopes, Terahertz radiation, Beam splitters, Spectral resolution

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Proceedings Article | 15 November 2000 Paper

Spaceborne spectrometer calibration with LEDs

Jens Nieke, M. Solbrig, Karl-Heinz Suemnich, Gerhard Zimmermann, Hans-Peter Roeser

Proceedings Volume 4135, (2000) https://doi.org/10.1117/12.494228

KEYWORDS: Light emitting diodes, Calibration, Spectroscopy, Diffusers, Epoxies, Lamps, Spectral calibration, Sun, Indium gallium nitride, Power supplies

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Proceedings Article | 18 July 2000 Paper

New airborne digital camera with multispectral and stereo capability

Hans-Peter Roeser, Andreas Eckardt, Maria Schoenermark, Rainer Sandau, Peter Fricker

Proceedings Volume 4042, (2000) https://doi.org/10.1117/12.391898

KEYWORDS: Cameras, Digital cameras, Sensors, Charge-coupled devices, Remote sensing, Advanced distributed simulations, Imaging systems, Near infrared, Multispectral imaging, Spatial resolution

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Proceedings Article | 17 July 2000 Paper

Dedicated IR imaging fire sensor systems

Hans-Peter Roeser, Herbert Jahn, Klaus Briess, Eckehard Lorenz, Wolfgang Skrbek, Ingo Walter, Dieter Oertel

Proceedings Volume 4030, (2000) https://doi.org/10.1117/12.391782

KEYWORDS: Sensors, Infrared sensors, Imaging systems, Infrared imaging, Satellites, Cameras, Image sensors, Spatial resolution, Flame detectors, Remote sensing

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Proceedings Article | 20 June 2000 Paper

GREAT: the first-generation German heterodyne receiver for SOFIA

Rolf Guesten, Paul Hartogh, Heinz-Wilhelm Huebers, Urs Graf, K. Jacobs, Hans-Peter Roeser, Frank Schaefer, Rudolf Schieder, Ronald Stark, Juergen Stutzki, Peter Van der Wal, Achim Wunsch

Proceedings Volume 4014, (2000) https://doi.org/10.1117/12.389122

KEYWORDS: Terahertz radiation, Heterodyning, Spectroscopy, Receivers, Astronomy, Spectral resolution, Sensors, Oscillators, Spectroscopes, Acousto-optics

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Proceedings Article | 20 June 2000 Paper

NbN hot-electron bolometer as THz mixer for SOFIA

Heinz-Wilhelm Huebers, A. Semenov, Josef Schubert, Gregory Gol'tsman, Boris Voronov, Eugeni Gershenzon, Alfred Krabbe, Hans-Peter Roeser

Proceedings Volume 4014, (2000) https://doi.org/10.1117/12.389097

KEYWORDS: Terahertz radiation, Antennas, Receivers, Heterodyning, Temperature metrology, Silicon, Astronomy, Superconductors, Far infrared lasers, Bolometers

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Proceedings Article | 31 July 1998 Paper

2- to 6-THz heterodyne receiver array for the Stratospheric Observatory for Infrared Astronomy (SOFIA)

Gerhard Schwaab, Karsten Auen, Erik Bruendermann, Roland Feinaeugle, Gregory Gol'tsman, Heinz-Wilhelm Huebers, Alfred Krabbe, Hans-Peter Roeser, Giles Sirmain

Proceedings Volume 3357, (1998) https://doi.org/10.1117/12.317415

KEYWORDS: Terahertz radiation, Receivers, Heterodyning, Diodes, Germanium, Semiconductor lasers, Oscillators, Far infrared lasers, Silicon, Astronomy

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Proceedings Article | 14 September 1994 Paper

High-resolution heterodyne spectrometer for the KAO (Kuiper Airborne Observatory)

Hans-Peter Roeser

Proceedings Volume 2268, (1994) https://doi.org/10.1117/12.185836

KEYWORDS: Heterodyning, Spectroscopy, Diodes, Observatories, Receivers, Carbon monoxide, Telescopes, Astronomy, Molecules, Clouds

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Proceedings Article | 1 October 1991 Paper

FIR lasers as local oscillators in submillimeter astronomy

Hans-Peter Roeser, Peter Van der Wal

Proceedings Volume 1501, (1991) https://doi.org/10.1117/12.46876

KEYWORDS: Carbon dioxide lasers, Oscillators, Laser resonators, Spectroscopy, Resonators, Airborne laser technology, Astronomy, Heterodyning, Optical pumping, Molecular lasers

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Proceedings Article | 1 December 1990 Paper

Spectral linewidth of p-type Germanium laser

H. P. Röser

Proceedings Volume 1514, 15146P (1990) https://doi.org/10.1117/12.2301651

KEYWORDS: Germanium, Semiconductor lasers, Tunable lasers, Heterodyning, Magnetism, Fabry–Perot interferometry, Magnetic sensors, Receivers, Applied sciences, Far infrared

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