Dr. Ulrich Gengenbach Profile

Dr. Ulrich Gengenbach

at Karlsruher Institut für Technologie

SPIE Involvement:

Author

Publications (11)

Proceedings Article | 20 June 2021 Presentation + Paper

The effects of pattern screen surface deformation on deflectometric measurements: a simulation study

Stephan Allgeier, Ulrich Gengenbach, Bernd Köhler, Klaus-Martin Reichert, Veit Hagenmeyer

Proceedings Volume 11787, 1178708 (2021) https://doi.org/10.1117/12.2591877

Read Abstract +

Proceedings Article | 21 August 2020 Presentation + Paper

Reproducibility of two calibration procedures for phase-measuring deflectometry

Stephan Allgeier, Ulrich Gengenbach, Bernd Köhler, Klaus-Martin Reichert, Veit Hagenmeyer

Proceedings Volume 11490, 114900G (2020) https://doi.org/10.1117/12.2567092

KEYWORDS: Calibration, Cameras, Mirrors, Imaging systems, Deflectometry, Image processing, Printing

Read Abstract +

Proceedings Article | 21 June 2019 Presentation + Paper

Robust phase unwrapping based on non-coprime fringe pattern periods for deflectometry measurements

Stephan Allgeier, Ulrich Gengenbach, Bernd Köhler, Klaus-Martin Reichert, Veit Hagenmeyer

Proceedings Volume 11061, 1106103 (2019) https://doi.org/10.1117/12.2523564

KEYWORDS: Fringe analysis, Phase measurement, Cameras, Deflectometry, Printing, Phase retrieval, Inspection, Additive manufacturing

Read Abstract +

SPIE Journal Paper | 6 December 2018 Open Access

Design studies of varifocal rotation optics

Ingo Sieber, Peter Stiller, Ulrich Gengenbach

OE, Vol. 57, Issue 12, 125102, (December 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.12.125102

KEYWORDS: Refraction, Point spread functions, Freeform optics, Optical design, Monochromatic aberrations, Spherical lenses, Optics manufacturing, Aspheric lenses, Optical simulations, Optical engineering

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 5 June 2018 Paper

Design for manufacture of a varifocal rotation optics

Ingo Sieber, Peter Stiller, Daniel Moser, Ulrich Gengenbach

Proceedings Volume 10690, 106901B (2018) https://doi.org/10.1117/12.2311650

KEYWORDS: Refraction, Optics manufacturing, Freeform optics, Optical design, Image quality, Device simulation, Optical simulations, Optical alignment, Image analysis

Read Abstract +

Proceedings Article | 8 October 2015 Open Access

Concept and set-up of an IR-gas sensor construction kit

Ingo Sieber, Gernot Perner, Ulrich Gengenbach

Proceedings Volume 9793, 97931E (2015) https://doi.org/10.1117/12.2223110

KEYWORDS: Sensors, Mirrors, Infrared sensors, Reflectors, Absorption, Additive manufacturing, Gas sensors, Optical design, Reflectivity, Optical components

Read Abstract +

The paper presents an approach to a cost-efficient modularly built non-dispersive optical IR-gas sensor (NDIR) based on a construction kit. The modularity of the approach offers several advantages: First of all it allows for an adaptation of the performance of the gas sensor to individual specifications by choosing the suitable modular components. The sensitivity of the sensor e.g. can be altered by selecting a source which emits a favorable wavelength spectrum with respect to the absorption spectrum of the gas to be measured or by tuning the measuring distance (ray path inside the medium to be measured). Furthermore the developed approach is very well suited to be used in teaching. Together with students a construction kit on basis of an optical free space system was developed and partly implemented to be further used as a teaching and training aid for bachelor and master students at our institute. The components of the construction kit are interchangeable and freely fixable on a base plate. The components are classified into five groups: sources, reflectors, detectors, gas feed, and analysis cell.

Source, detector, and the positions of the components are fundamental to experiment and test different configurations and beam paths. The reflectors are implemented by an aluminum coated adhesive foil, mounted onto a support structure fabricated by additive manufacturing. This approach allows derivation of the reflecting surface geometry from the optical design tool and generating the 3D-printing files by applying related design rules. The rapid fabrication process and the adjustment of the modules on the base plate allow rapid, almost LEGO®-like, experimental assessment of design ideas.

Subject of this paper is modeling, design, and optimization of the reflective optical components, as well as of the optical subsystem. The realization of a sample set-up used as a teaching aid and the optical measurement of the beam path in comparison to the simulation results are shown as well.

DOWNLOAD PAPER

Proceedings Article | 1 May 2014 Paper

Design of freeform optics for an ophthalmological application

Ingo Sieber, Allen Yi, Likai Li, Erik Beckert, Ralf Steinkopf, Ulrich Gengenbach

Proceedings Volume 9131, 913108 (2014) https://doi.org/10.1117/12.2051413

KEYWORDS: Optics manufacturing, Freeform optics, Data modeling, Integrated optics, Modulation transfer functions, Optical design, Optical simulations, Modeling, Optical components, Tolerancing

Read Abstract +

Proceedings Article | 8 October 2001 Paper

Microgripper construction kit

Ulrich Gengenbach, Andreas Hofmann, Friedhelm Engelhardt, Rudolf Scharnowell, Bernd Koehler

Proceedings Volume 4568, (2001) https://doi.org/10.1117/12.444137

KEYWORDS: Actuators, Interfaces, Sensors, Adhesives, Prototyping, Integration, Connectors, Manufacturing, Optics manufacturing, Cameras

Read Abstract +

Proceedings Article | 8 October 2001 Paper

Standards for hybrid microsystems production equipment

Ulrich Gengenbach

Proceedings Volume 4568, (2001) https://doi.org/10.1117/12.444136

KEYWORDS: Microsystems, Standards development, Interfaces, Manufacturing, Sensors, Microfluidics, Semiconductors, Actuators, Connectors, Spectroscopy

Read Abstract +

Proceedings Article | 11 October 2000 Paper

Electrostatic feeder for contactless transport of miniature and microparts

Ulrich Gengenbach, James Boole

Proceedings Volume 4194, (2000) https://doi.org/10.1117/12.403705

KEYWORDS: Electrodes, Particles, Dielectrophoresis, Prototyping, Dielectrics, Polymers, Switching, Systems modeling, Digital image processing, Mirrors

Read Abstract +

Proceedings Article | 11 December 1996 Paper

Automatic assembly of micro-optical components

Ulrich Gengenbach

Proceedings Volume 2906, (1996) https://doi.org/10.1117/12.260618

KEYWORDS: Spherical lenses, Optical filters, Adhesives, Control systems, Optical components, Sensors, Assembly equipment, Single mode fibers, Optical fibers, Tolerancing

Read Abstract +

Showing 5 of 11 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years