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Prof. Dr. rer. nat. Gerald Fütterer, Dipl.-Phys.

Produktionstechnik / Messtechnik / Berechnung optischer Systeme & Komponenten Wissenschaftliche Leitung

Professor

Wissenschaftliche Leitung Institut für Präzisionsbearbeitung und Hochfrequenztechnik - IPH


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Beitrag (Sammelband oder Tagungsband)

  • Michael Wagner
  • Gerald Fütterer

Computer-aided beam path generation and assessment for Stevick-Paul telescopes

pg. 114780B.

Bellingham, WA, USA

  • (2020)

DOI: 10.1117/12.2564852

At Deggendorf Institute of Technology a student project is currently under way to build a Stevick-Paul telescope for astrophotography. An important step in the overall development procedure of each telescope is the design of a beam-path and ensuring its suitability under optical and engineering aspects. The students performed this process in a sequential manner by using several different computer programs (e.g. MATLAB, Zemax, Creo Parametric). To accelerate the beam path design process, a Python program to automate the major part of the design process with minimum human supervision was created. The input data of the python program consists of ranges of the desired characteristics of the Stevick-Paul telescope, such as focal lengths, primary mirror diameters and tilts etc., mirror thickness and mount geometries, as well as the specific type of camera. After setting the input, the program creates 2D cross-sections of beam paths according to the formulas of D. Stevick and may introduce a flat fold mirror to reduce the overall system size as well as improve the accessibility of the focus plane. The subsequent assessment routine checks against the susceptibility for stray light and performs a complex analysis of the available installation space to ensure sufficient mechanical tolerances. In this way, collisions between mirrors, mounts and cameras are avoided and obstructions of the beam path are prevented. At any stage, the program can produce graphical representations of the beam paths. In this paper the computer-aided design of a telescope beam path with a focal length of 2400 mm is demonstrated. During development of the software, a subset of folded Stevick-Paul telescopes, in which certain components are parallel, was found. This subset may be useful to simplify the alignment procedure. In conclusion, further refinement of the software is necessary, although the program is already a useful aid for certain aspects when creating a beam path design.
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • NACHHALTIG
Patent

  • Gerald Fütterer
  • N. Leister
  • R. Haussler
  • G. Lazarev

Spatial light modulator device for the modulation of a wave field with compex information

  • 18.03.2019 (2019)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer
  • Michael Wagner
  • Lucas Bauer
  • Simon Wittl

4-Schiefspiegel-Teleskop: Justage und Stabilitätsaspekte

pg. 118-119.

Deggendorf

  • (2019)
  • TC Teisnach Sensorik
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • NACHHALTIG
Patent

  • Gerald Fütterer

Beam divergence and various collimators for holographic or stereoscopic displays

  • 20.05.2019 (2019)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Vortrag

  • Gerald Fütterer

4x-Schiefspiegel-Teleskop-Projekt . Posterpräsentation

In: 6. Tag der Forschung

Technische Hochschule Deggendorf Deggendorf

  • 10.04.2019 (2019)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
  • NACHHALTIG
Vortrag

  • Gerald Fütterer

Wave front sensing for metrology by using optical filter

In: Sixth European Seminar on Precision Optics Manufacturing (POM19)

Technische Hochschule Deggendorf Teisnach

  • 10.04.2019 (2019)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer
  • Michael Wagner
  • Lucas Bauer
  • Simon Wittl

Four-Tilted-Mirror Telescope: Alignment and Stability Aspects

pg. 153-158.

Deggendorf

  • (2019)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer
  • Michael Wagner
  • Lucas Bauer
  • Simon Wittl

Alignment and thermal drift aspects of a four-tilted-mirror student project telescope

pg. 111710L1-111710L9.

Bellingham, WA, USA

  • (2019)

DOI: 10.1117/12.2530076

The Deggendorf Institute of Technology (DIT) and its Faculty of Applied Natural Sciences and Industrial engineering transfer a broad spectrum of knowledge to the students. The clarification of the interrelations that exist between seemingly isolated fields of knowledge is a permanent process. In order to put this into practice, a telescope construction project was started. The base of the in-house student project is the Technology Campus in Teisnach, which bundles capacities for process development, production and measurement of high-precision optics, including telescope optics. A first optical design, which is based on a subset of the parameter space published in 1989 by M. Brunn1, 2 (later built by D. Stevick as f/12-system3 ), made use of a primary mirror M1 with a diameter of 400 mm. An f/8-system provide a Strehl ratio SR ≥ 0.8 over an entire field of view of 0.7° deg. Even if this seems to be sufficient, manufacturing tolerances, adjustment tolerances, thermal drift and positional changes considerably reduce the Strehl ratio. In order to obtain reliable values of acceptable tolerances, statistical Monte Carlo analyses had been carried out. As consequences, the tube design was changed and the design of new mirror mounts started. This was done to achieve the required stiffness. The new tube designs, one based on carbon-fiber-reinforced polymer (CFRP) and one based on FeNi36, had been tested by using FEM analysis. In addition, the practicability of deep learning based aberration detection was tested. Zernike polynomials obtained by analyzing the star images with a Convolutional Neuronal Network (CNN). The current state of the development is described.
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • NACHHALTIG
Patent

  • Gerald Fütterer

Display Device, holographic head-mounted display

  • (2018)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer
  • Johannes Liebl
  • Alexander Haberl

Contribution of the phase transfer function of extended measurement cavities to mid spatial frequencies and the overall error budget

pg. 108290L.

  • (2018)

DOI: 10.1117/12.2318711

A challenge of coaxial - measurement cavity based - interferometer is to realize an interference contrast in the vicinity of one and to realize a complete elimination of the parasitic reflections. Another challenge, which also exists in non-coaxial setups, is the phase transfer function of extended measurement cavities. Ideally, the surface under test (SUT) and the reference surface (REF) are both exactly imaged onto the detector plane. In practice, SUT and REF have to be placed within the depth of field (DOF), which refers to the object space. The term depth of focus refers to the image space. To avoid confusion, the depth of field might be referred to as DOOF (depth of object field) and the depth of focus might be referred to as DOIF (depth of image field). However, in many measurement situations, the REF is not placed within the DOOF, which is the small z-range, which is imaged onto the detector plane. Furthermore, the phase transfer function (PTF) of the REF and the image distortion of the REF are both dependent on the focal plane used to image the SUT onto the detector plane. Effects as phase deformation, image distortion and image blurring have to be taken into account when using extended measurement cavities. This can be done by using a look up table (LUT), which contains simulated and/or calibrated data. Thus, the related system error can be subtracted. A remaining challenge is an unknown object under test (OUT), which is measured by using a double path arrangement. The measured wave front depends on the two surfaces of the OUT and the position of the return mirror. For simplicity, a homogeneous substrate and a perfect return mirror might be presumed. The simulation of waves propagating within extended measurement cavities, as well as measurement results, will be discussed. In addition, the influence on the power spectral density (PSD) will be described. This is important for high end correction techniques as e.g. magneto rheological figuring (MRF) and ion beam figuring (IBF).
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • NACHHALTIG
Vortrag

  • Gerald Fütterer

CSLM illumination for 1D and 2D encoded holographic 3D displays

In: Illumination Optics V, Symposium: EOD18 SPIE Optical Systems Design

Frankfurt am Main

  • 14.05.2018 (2018)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Alexander Haberl
  • H. Harsch
  • Gerald Fütterer
  • Johannes Liebl
  • C. Pruß
  • Rolf Rascher
  • W. Osten

Model based error separation of power spectral density artefacts in wavefront measurement

pg. 107490T.

  • (2018)

DOI: 10.1117/12.2321106

  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Vortrag

  • Gerald Fütterer
  • A. Sperl
  • A. Engelbrecht
  • Simon Killinger
  • M. Werni
  • W. Krais

Abschattungsfreies Multi-Schiefspiegel-Teleskop als studentisches Entwicklungsprojekt

In: 119. Jahrestagung der Deutschen Gesellschaft für angewandte Optik (DGaO)

Aalen

  • 22.-26.05.2018 (2018)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Vortrag

  • Alexander Haberl
  • H. Harsch
  • Gerald Fütterer
  • Johannes Liebl
  • C. Pruß
  • Rolf Rascher
  • W. Osten

Model based error separation of power spectral density artefacts in wavefront measurement

In: SPIE Optical Engineering + Applications Conference on Interferometry XIX

San Diego, CA, USA

  • 19.-23.08.2018 (2018)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer
  • A. Sperl
  • A. Engelbrecht
  • Simon Killinger
  • M. Werni
  • W. Krais

Abschattungsfreies Multi-Schiefspiegel-Teleskop als studentisches Entwicklungsprojekt

  • (2018)

An der Fakultät für Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen der Technische Hochschule Deggendorf wird ein breites Wissensspektrum vermittelt. Um dieses praxisnah zu gestalten, wurde ein Teleskopbau-Projekt ins Leben gerufen. Mit dem Technologie-Campus Teisnach existiert die Basis für die Fertigung und Messung hoch präziser Teleskop-Optiken. Ausgangsparameter sind 400 mm Durchmesser des Primärspiegels und der Ansatz, am Markt bestehende Systeme in der optischen Abbildungsleistung einzuholen. Das optische Design beruht auf einer Untermenge des Parameterraums, der 1989 von M. Brunn veröffentlicht wurde. Das Konzept wurde später von D. Stevick als F12 System (mit Bezug auf die Arbeit von M. Paul, 1935) gebaut. Das THD-Projekt startete mit einem Vergleich von F7 Systemen, die in Zemax implementiert wurden. Die Abbildungsleistung wurde über ein Feld von 0,7 ° deg verglichen. Das mechanische Design schließt FEM Simulation thermischer Effekte an leichtgewichteten Spiegeln ein. Unterschiedliche Tuben wurden miteinander verglichen, einschließlich CFK Monocoquetubus. Ein weiterer Punkt ist die Auslegung der Nachführung. Es wird der Stand der Entwicklung dargelegt.
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer

Polarization-Fizeau interferometer enabling phase measurement with reduced uncertainty

pg. 103260B.

  • (2017)

DOI: 10.1117/12.2272001

  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Patent

  • Gerald Fütterer

A Display for Two-Dimensional and/or Three-Dimensional Images

  • (2017)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • DIGITAL
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer

Fast Fizeau interferometer with polarization selective reference and reduced measurement uncertainty for production integrated measurement

pg. 97-101.

  • (2017)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer

Advantages of on-axis PBS based Fizeau interferometers

  • (2017)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Patent

  • Gerald Fütterer

Illumination device

  • (2017)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Patent

  • Gerald Fütterer

Light Modulation Device

  • 20.01.2016 (2016)
The invention relates to a light modulation device (60) for a display device (10), in particular a holographic display device, for the representation of two-dimensional and/or three-dimensional reconstructed scenes. The light modulation device (60) has at least one spatial light modulator (70), having modulation elements, for the modulation of incident light and an optical element (80) with known optical characteristics. The light falling on the at least one spatial light modulator (70) is thereby sufficiently coherent. The at least one spatial light modulator (70) and the optical element (80) are combined with one another in such a way that the optical element (80) scatters the unmodulated light emitted from the spatial light modulator (70) into an angle range.
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer

Field lens multiplexing in holographic 3D displays by using Bragg diffraction based volume gratings

  • (2016)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer

From Holographic displays to Volume Gratings and Off-Axis Parabolic Mirrors

pg. 1000912.

  • (2016)

DOI: 10.1117/12.2245183

An important chain link in modeling of three dimensional data (3D data), 3D prototyping, CAD-CAM, computerintegrated manufacturing (CIM), PC gaming, global 3D teleconferencing, future e-commerce, product advertisement and mobile infotainment is the visualization of 3D data and 3D objects. On the one hand, there is an increasing demand for 3D displays providing natural three dimensional viewing experience, but on the other hand there is a lack of available 3D displays capable of generating all depth cues. Available state of the art 3D displays can provide only a few depth cues and a very limited 3D experience. This is due to the inherent physical limits of the different approaches used. Holographic displays, for instance based on space bandwidth limited wave segment reconstruction, can provide all depth cues and a large viewing volume. They can provide satisfying 3D visualization. But still they are not available. Thick hologram gratings 1, which also can be referred to as Bragg diffraction based volume gratings, are key components, which enable small form factor holographic 3D displays. Manufacturing large, display size Bragg diffraction based volume gratings is challenging. Collimators are key components within interference lithographic exposure setups. Using off-axis parabolic mirrors (OAPM) as collimating optical elements enables the generation of exact plane waves by using a single reflective surface. Thus, off-axis parabolic mirrors are preferred in order to realize the collimation of large wave fronts. The surface roughness has to be very low. The relationship between holographic 3D displays and specific requirements, which have to be taken into account when manufacturing off-axis parabolic mirrors, will be presented. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • NACHHALTIG
Patent

  • Gerald Fütterer
  • B. Kroll
  • N. Leister
  • H. Stolle

Projektionsvorrichtung und Verfahren zum Darstellen einer zweidimensionalen und/oder dreidimensionalen Szene oder von Inhalt

  • (2015)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Patent

  • Gerald Fütterer

Display Device for Holographic Reconstruction

  • (2015)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Patent

  • Gerald Fütterer
  • B. Kroll
  • N. Leister
  • H. Stolle

Projection display and method for displaying at least one of two-dimensional and three-dimensional scene or of content

  • 30.06.2015 (2015)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
  • DIGITAL
Patent

  • Gerald Fütterer
  • R. Häußler
  • B. Kroll
  • N. Leister
  • S. Reichelt

Combined light modulation device for tracking users

  • (2011)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Patent

  • Gerald Fütterer

Beam divergence and various collimators for holographic or stereoscopic displays

  • (2011)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik
Beitrag (Sammelband oder Tagungsband)

  • R. Probst
  • Gerald Fütterer
  • J. Illemann
  • J. Mokroš
  • P. Lui
  • E. Bachish

An angular reversal technique for error separation between a dual axis electronic autocollimator and a PZT tilting platform

  • (2007)
  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Beitrag (Sammelband oder Tagungsband)

  • Gerald Fütterer

Enhancement of high-resolution electronic autocollimators by application of phase grating technology

  • (2005)

DOI: 10.1117/12.612745

  • TC Teisnach Optik
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Patent

  • Gerald Fütterer

Autokollimationsfernrohr und Verfahren zur Abbildung einer Messmarke hierfür

  • (2005)
  • Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen
  • TC Teisnach Optik

Labore

Lehr-Labor Optik der NuW (L104)