Dr. Tobias J. Haist Profile

Dr. Tobias J. Haist

Group Leader of 3D Metrology at Institut für Technische Optik

SPIE Involvement:

Author | Instructor

Publications (61)

Proceedings Article | 13 March 2024 Presentation

Endoscopic measurement system for elastographic tissue differentiation based on active triangulation and 3D-printed micro-optics

Valese Aslani, Tobias Haist, Simon Thiele, Alois Herkommer

Proceedings Volume 12817, 128170E (2024) https://doi.org/10.1117/12.3007293

KEYWORDS: Tissues, Endoscopy, Micro optics, Elasticity, Bladder, Surgery, Sensors, Viscoelasticity, Tumors, Silicon

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Proceedings Article | 12 March 2024 Presentation + Paper

Towards pathogen detection with 3D-printed micro-optics in microfluidic systems

Kathrin Doth, Tobias Haist, Stephan Reichelt

Proceedings Volume 12876, 128760K (2024) https://doi.org/10.1117/12.3008437

KEYWORDS: Microfluidics, Printing, Optical tweezers, Miniaturization, Micro optics, Two photon polymerization, Holography, Diffraction, Pathogens, Optical design

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SPIE Journal Paper | 20 February 2024

Large dynamic range Shack–Hartmann wavefront sensor based on holographic multipoint generation and pattern correlation

Simon Hartlieb, Zhen Wang, Andrea Rüdinger, Tobias Haist, Stephan Reichelt

OE, Vol. 63, Issue 02, 024107, (February 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.2.024107

KEYWORDS: Wavefronts, Sensors, Wavefront reconstruction, Wavefront sensors, Diffraction, Image sensors, Calibration, Optical engineering, Microlens array, Computer generated holography

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Proceedings Article | 11 August 2023 Paper

Differential perspective as a non-expensive distance sensing principle

Tobias Haist, Felix Lodholz, Andreas Faulhaber, Stephan Reichelt

Proceedings Volume 12623, 126230E (2023) https://doi.org/10.1117/12.2673618

KEYWORDS: Image processing, Cameras, Object detection, Distance measurement, Sensors, Measurement uncertainty, Autonomous driving, Video, Tunable filters, Biological research

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Proceedings Article | 7 August 2023 Presentation + Paper

Parallelized computed tomography imaging spectrometer

Simon Amann, Tobias Haist, Alexander Gatto, Markus Kamm, Stephan Reichelt

Proceedings Volume 12624, 126240M (2023) https://doi.org/10.1117/12.2676116

KEYWORDS: Spectral computed tomography, Image sensors, Diffraction, Prisms, Computed tomography, Diffractive optical elements, Spectroscopy, Prototyping, Hyperspectral imaging

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Proceedings Article | 8 March 2023 Presentation + Paper

Intermediate image free computed tomography imaging spectrometer

Simon Amann, Tobias Haist, Alexander Gatto, Markus Kamm, Alois Herkommer

Proceedings Volume 12428, 124280G (2023) https://doi.org/10.1117/12.2650096

KEYWORDS: Diffraction, Prototyping, Diffractive optical elements, Beam expanders, Sensors, Cameras, Hyperspectral imaging, Computer generated holography, Spectroscopy, Spectral computed tomography, Spectral imaging cameras, Computational imaging, Computed tomography

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SPIE Journal Paper | 28 May 2022 Open Access

Deep learning-based hyperspectral image reconstruction from emulated and real computed tomography imaging spectrometer data

Markus Zimmermann, Simon Amann, Mazen Mel, Tobias Haist, Alexander Gatto

OE, Vol. 61, Issue 05, 053103, (May 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.5.053103

KEYWORDS: Image sensors, Hyperspectral imaging, Sensors, Expectation maximization algorithms, Diffraction, Reconstruction algorithms, Image restoration, Neural networks, Point spread functions, Spectroscopy

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Proceedings Article | 20 May 2022 Presentation + Paper

Holographical image based vibrometry with monochromatic and event based cameras

Simon Hartlieb, Maciej Boguslawski, Tobias Haist, Stephan Reichelt

Proceedings Volume 12137, 1213702 (2022) https://doi.org/10.1117/12.2621973

KEYWORDS: Cameras, Light sources, Vibrometry, Holography, Sensors, Optical sensors, Diffractive optical elements, Image sensors, Holograms

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Proceedings Article | 17 May 2022 Paper

Novel snapshot hyperspectral imager based on diffractive elements

R. Hahn, J. Görres, T. Haist, W. Osten, S. Reichelt

Proceedings Volume 12139, 121390I (2022) https://doi.org/10.1117/12.2621521

KEYWORDS: Sensors, Image sensors, Diffractive optical elements, Hyperspectral imaging, Confocal microscopy, Imaging systems, Spectral resolution, 3D metrology, 3D surface sensing, Hyperspectral sensing

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SPIE Journal Paper | 27 January 2022 Open Access

Diffraction-based hyperspectral snapshot imager

Robin Hahn, Tobias Haist, Kristina Michel, Wolfgang Osten

OE, Vol. 61, Issue 01, 015106, (January 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.1.015106

KEYWORDS: Spectral resolution, Imaging systems, Hyperspectral imaging, Optical filters, Image sensors, Sensors, Image filtering, Spatial resolution, Diffractive optical elements, Optical engineering

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SPIE Journal Paper | 3 December 2020 Open Access

Detailed characterization of a mosaic based hyperspectral snapshot imager

Robin Hahn, Freya-Elin Hämmerling, Tobias Haist, David Fleischle, Oliver Schwanke, Otto Hauler, Karsten Rebner, Marc Brecht, Wolfgang Osten

OE, Vol. 59, Issue 12, 125102, (December 2020) https://doi.org/10.1117/12.10.1117/1.OE.59.12.125102

KEYWORDS: Sensors, Imaging systems, Hyperspectral imaging, Cameras, Manufacturing, Optical filters, Optical engineering, Electronic filtering, Monochromators, Image sensors

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Proceedings Article | 1 April 2020 Presentation + Paper

Increasing the accuracy of imaging-based dimensional measurements

Tobias Haist, Adriana Steinitz, Flavio Guerra

Proceedings Volume 11352, 1135204 (2020) https://doi.org/10.1117/12.2556800

KEYWORDS: Image sensors, Image processing, Error analysis, Calibration, Computer generated holography, Imaging systems, Holograms, Sensors, Distance measurement, Edge detection

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Proceedings Article | 1 April 2020 Presentation + Paper

Accurate 3D coordinate measurement using holographic multipoint technique

Simon Hartlieb, Cihan Erol, Michael Tscherpel, Tobias Haist, Flavio Guerra, Wolfgang Osten, Michael Ringkowski, Oliver Sawodny

Proceedings Volume 11352, 1135203 (2020) https://doi.org/10.1117/12.2555372

KEYWORDS: Calibration, Cameras, Image processing, Field programmable gate arrays, 3D metrology, Detection and tracking algorithms, Sensors, Computer generated holography, Imaging systems

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Proceedings Article | 1 April 2020 Presentation + Paper

Detailed characterization of a hyperspectral snapshot imager for full-field chromatic confocal microscopy

Robin Hahn, Tobias Haist, Freya-Elin Hämmerling, David Fleischle, Oliver Schwanke, Otto Hauler, Karsten Rebner, Marc Brecht, Wolfgang Osten

Proceedings Volume 11352, 113520Y (2020) https://doi.org/10.1117/12.2556797

KEYWORDS: Sensors, Optical filters, Cameras, Hyperspectral imaging, Confocal microscopy, Speckle, Colorimetry, Monochromators, 3D metrology, Hyperspectral sensing

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Proceedings Article | 2 March 2020 Presentation + Paper

Holographic point replication as a sensor-enhancing technique for adaptive building control

Flavio Guerra, Alexander Warsewa, Simon Hartlieb, Tobias Haist, Wolfgang Osten, Oliver Sawodny

Proceedings Volume 11287, 112870Z (2020) https://doi.org/10.1117/12.2546226

KEYWORDS: Sensors, Cameras, Prototyping, Actuators, Control systems, Image sensors, Computer generated holography, Holography, Temporal resolution, Adaptive control

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Proceedings Article | 18 December 2019 Paper

Dynamically scanned spot projections with digital holograms for reduced measurement uncertainty in laser triangulation systems

Andreas Faulhaber, Marc Gronle, Stefan Haberl, Thomas Buchholz, Tobias Haist, Wolfgang Osten

Proceedings Volume 11338, 113383F (2019) https://doi.org/10.1117/12.2548075

KEYWORDS: Speckle, Sensors, Speckle pattern, Spatial light modulators, Digital holography, Stochastic processes, Image sensors, Holograms, Diffraction

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Measurement systems based on laser spot triangulation are widely used in many fields of distance-, surface and 3D measurements. Currently, strong interest in applications like laser-range detection (LIDAR) in automotive driving and robotics also promote further research in improving the technique. Laser-based ranging and triangulation techniques suffer from the great advantage of one of the lasers properties - its coherence. A coherent laser light ray allows projecting a spatially small spot onto an object compared to a broadly illuminating LED or bulb. A detector, e.g. camera or photodiode, detects the reflected measurement spot precisely with its position on the object. The downside of the coherence appears in combination with a rough reflecting surface as speckles. Speckle is the noise of the spot due to the rough object surface and the resulting random phases. In some measurement settings, the speckle noise has a large negative effect and influence on the measurement uncertainty to determine the precise center-of-gravity of the measurement-spot's position. In this contribution, we investigate a method introduced by us in an experiment to reduce the speckle noise and therefore improve the measurement uncertainty in triangulation. The proposed multi-spot-scanning method decorrelates speckle noise patterns through dynamical holography of the laser-spot by varying the position microscopically. For the dynamical scanning of the spot, we use a spatial light modulator (SLM) being addressed with digital holograms. SLMs are part of many measurement systems and other optical applications, especially projection-based systems. The holograms, illuminated by the laser, microscopically translate the measurement spot position in the object plane. These so-called "miicro-variations" are in fact translations of the first diffraction order using a grating on the SLM with additional overlaid Zernike-polynomials. The grating has a carrier frequency calculated according to the SLM's pixel size. Due to the micro-variations, the speckle noise patterns vary and decorrelate. Integrating or averaging over many patterns on the camera then allows predicting the spot's position with higher certainty through its better uniformity. Additionally, we examined how well the speckle decorrelation affects the uncertainty reduction especially in a triangulation sensor setup. Our experiments, utilizing the multi-spot-scanning method, showed promising first results. The microvariations in our experiments corresponded well to the simulations. Using different Zernike-coefficients, we are able to control the spot position to roughly a couple of micrometers while having a maximum field size for micro-variation of up to 16 mm in diameter. The best micro-variation-spot radius was between 75 μm and 85 μm considering a spot size of FWHM = 53 μm. We also found out, that with the method we could decorrelate speckle patterns to a certain degree. This degree can reduce the noise while averaging by a factor of around 40% compared to the original noise. Overall, the statistical measurement uncertainty improved by the reduction ratio of approximately R = 3 in axial direction. Further investigations on more spot-variations (7-42 spots) lead to solely slight improvements, because the denser the spots are, more overlap is present and less microvariation and decorrelation is possible. Furthermore, we have investigated different Zernike-polynomials (coma, defocus and astigmatism) and their influence on combined variations. In conclusion, we describe a method for laser-triangulation sensor systems to reduce laser speckle noise and improve measurement uncertainty. With this method, we can increase the axial resolution of the triangulation with the disadvantage of losing a small amount of lateral resolution due to the averaging and variation of the spot. We hope to be able to also expand our findings to other scenarios and setups as well as improve the findings with further research.

Proceedings Article | 12 July 2019 Open Access

Characterization of fiber-based slit homogenizer devices in the NIR and SWIR

Simon Amann, Quynh Duong-Ederer, Tobias Haist, Bernd Sierk, Benedikt Guldimann, Wolfgang Osten

Proceedings Volume 11180, 111806C (2019) https://doi.org/10.1117/12.2536147

KEYWORDS: Image sensors, Optical fibers, Short wave infrared radiation, Sensors, Near infrared, Imaging systems, Spectroscopy, Image processing, Homogenization, Polarization

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Proceedings Article | 12 July 2019 Presentation + Paper

Deformation measurement of large buildings by holographical point replication

Flavio Guerra, Simon Hartlieb, Alexander Warsewa, Tobias Haist, Wolfgang Osten, Oliver Sawodny

Proceedings Volume 11058, 110580G (2019) https://doi.org/10.1117/12.2525815

KEYWORDS: Cameras, Buildings, Image sensors, Sensors, Computer generated holography, Distance measurement, Holography, Calibration, Multiplexing, Turbulence

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Proceedings Article | 21 June 2019 Presentation + Paper

Hybrid telecentric triangulation sensor system with real-time field-dependent deconvolution

Andreas Faulhaber, Marc Gronle, Tobias Haist, Christof Pruß, Yousef Baroud, Wolfgang Osten, Sven Simon

Proceedings Volume 11056, 1105613 (2019) https://doi.org/10.1117/12.2525568

KEYWORDS: Imaging systems, Distortion, Diffractive optical elements, Image restoration, Chromatic aberrations, Sensors, Deconvolution, Objectives, Diffraction

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High-resolution optical inspection techniques typically require expensive imaging systems. One possible approach for reducing the overall cost of such systems is to combine optics of limited performance with digital image restoration techniques. In this contribution, we introduce a new hybrid system based on the combination of a field-programmablegate-array (FPGA), a large telecentric lens with strong field dependent chromatic aberrations and different types of object-adapted projections for 2D and 3D inspection tasks. The optical design tries to minimize cost and weight by replacing the – typically very large – first refractive group of the object-sided telecentric lens by one thin diffractive optical element. This approach can correct the field-dependent aberrations very well. Unfortunately, strong chromatic aberrations are unavoidable. For restoration, we use digital image processing by means of advanced deconvolution algorithms. The necessary number of operations for the strong fielddependent aberrations is extremely high. We combine algorithmic approaches (convolutions using singular-value decomposition) and parallelization directly on the FPGA to achieve live restoration (15 Hz) for a custom-built image sensor with three megapixels. The power consumption is low and a compact processing unit is realized. This hybrid (digital-optical) imaging system is used for 2D- and 3D inspection based on adaptive triangulation. One approach is based on inverse fringe projection. Ray-tracing based on the sensor setup and a reference CAD-model of the part to be tested is used for computing a fringe mask. This mask is inscribed on a spatial light modulator, which then projects the fringes towards the object. If the object under test is without faults, high-frequency equidistant straight-line fringes will result on the image sensor and low height measurement uncertainties at low lateral resolutions, even for non-cooperative objects, are achievable. The importance of a large depth-of-field and constant image-scale along the optical axis for the inverse fringe projection lead to the decision of a telecentric objective.

Proceedings Article | 14 September 2018 Paper

Dynamic holography for speckle noise reduction in hybrid measurement system

Andreas Faulhaber, Stefan Haberl, Tobias Haist, Marc Gronle, Yousef Baroud, Wolfgang Osten, Sven Simon

Proceedings Volume 10744, 107440J (2018) https://doi.org/10.1117/12.2320486

KEYWORDS: Speckle, Speckle pattern, Sensors, Denoising, Monochromatic aberrations, Computer generated holography, Spatial light modulators, Holography, Light sources, Holograms

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Proceedings Article | 19 February 2018 Paper

How to drive an optical measurement system to outstanding performance

W. Osten, T. Haist, E. Manske

Proceedings Volume 10557, 105570Q (2018) https://doi.org/10.1117/12.2300856

KEYWORDS: Sensors, Optical testing, Metrology, Optical metrology, Interferometers, Data acquisition, Imaging systems, Manufacturing, Inspection, Interferometry

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Proceedings Article | 26 June 2017 Paper

Simulated BRDF based on measured surface topography of metal

Haiyue Yang, Tobias Haist, Marc Gronle, Wolfgang Osten

Proceedings Volume 10334, 1033405 (2017) https://doi.org/10.1117/12.2269978

KEYWORDS: Bidirectional reflectance transmission function, Machine vision, Light scattering, Ray tracing, Optical inspection, Scattering, Reflectivity, Process modeling, Metals, Inspection, Finite-difference time-domain method, Confocal microscopy, Reflection, Calibration, Light sources

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SPIE Journal Paper | 16 September 2015

Holography using pixelated spatial light modulators—part 1: theory and basic considerations

Tobias Haist, Wolfgang Osten

JM3, Vol. 14, Issue 04, 041310, (September 2015) https://doi.org/10.1117/12.10.1117/1.JMM.14.4.041310

KEYWORDS: Holograms, Holography, Spatial light modulators, Diffraction, Modulation, Modulators, Phase shift keying, Reconstruction algorithms, Holography applications, Phase modulation

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SPIE Journal Paper | 16 September 2015

Holography using pixelated spatial light modulators—Part 2: applications

Tobias Haist, Wolfgang Osten

JM3, Vol. 14, Issue 04, 041311, (September 2015) https://doi.org/10.1117/12.10.1117/1.JMM.14.4.041311

KEYWORDS: Spatial light modulators, Holography, Holograms, Aberration correction, Diffraction, Point spread functions, Digital holography, Wavefronts, Lenses, Optical filters

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Proceedings Article | 22 June 2015 Paper

Realistic simulation of camera images of local surface defects in the context of multi-sensor inspection systems

Haiyue Yang, Tobias Haist, Marc Gronle, Wolfgang Osten

Proceedings Volume 9525, 952522 (2015) https://doi.org/10.1117/12.2184612

KEYWORDS: Bidirectional reflectance transmission function, Inspection, Ray tracing, Light scattering, Cameras, Imaging systems, Scattering, Device simulation, Collimation, Optical inspection

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Proceedings Article | 22 June 2015 Paper

Towards one trillion positions

Tobias Haist, Marc Gronle, Duc Anh Bui, Bofan Jiang, Christof Pruss, Frederik Schaal, Wolfgang Osten

Proceedings Volume 9530, 953004 (2015) https://doi.org/10.1117/12.2184636

KEYWORDS: Holograms, Imaging systems, Sensors, Image sensors, Cameras, Calibration, Error analysis, Quantum wells, Electrons, Diffractive optical elements

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SPIE Journal Paper | 20 April 2015

Object field expansion in spatial light modulator-based phase contrast microscopy

Malte Hasler, Janek Stahl, Tobias Haist, Wolfgang Osten

OE, Vol. 54, Issue 04, 043107, (April 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.4.043107

KEYWORDS: Spatial light modulators, Phase contrast, Diffraction, Microscopy, Modulators, Microscopes, Aberration correction, Signal to noise ratio, Objectives, Optical engineering

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Proceedings Article | 11 November 2014 Paper

Applications of diffractive optical elements for optical measurement techniques

Frederik Schaal, Tobias Haist, Alexander Peter, Andreas Beeck, Christof Pruss, Wolfgang Osten

Proceedings Volume 9271, 927105 (2014) https://doi.org/10.1117/12.2071106

KEYWORDS: Diffractive optical elements, Holograms, Electroluminescent displays, Vertical cavity surface emitting lasers, Optical components, Microscopes, Picture Archiving and Communication System, Optical testing, Aberration correction, Beam shaping

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Proceedings Article | 18 September 2014 Paper

Hybrid curvature and modal wavefront sensor

Shihao Dong, Tobias Haist, Tom Dietrich, Wolfgang Osten

Proceedings Volume 9227, 922702 (2014) https://doi.org/10.1117/12.2058849

KEYWORDS: Wavefronts, Sensors, Wavefront sensors, Holograms, Diffraction, Holography, Multiplexing, Optical design, Adaptive optics

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Proceedings Article | 1 May 2014 Paper

A benchmark system for the evaluation of selected phase retrieval methods

Christian Lingel, Malte Hasler, Tobias Haist, Giancarlo Pedrini, Wolfgang Osten

Proceedings Volume 9132, 91320R (2014) https://doi.org/10.1117/12.2057472

KEYWORDS: Phase retrieval, Computer simulations, Cameras, Photovoltaics, Optical alignment, Holography, Phase measurement, Interferometry, Digital holography, Image processing

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Proceedings Article | 13 May 2013 Paper

Characterization and demonstration of a 12-channel Laser-Doppler vibrometer

T. Haist, C. Lingel, W. Osten, K. Bendel, M. Giesen, M. Gartner, C. Rembe

Proceedings Volume 8788, 87881V (2013) https://doi.org/10.1117/12.2020475

KEYWORDS: Sensors, Head, Interferometers, Vibrometry, Signal detection, Objectives, Cameras, Heterodyning, Demodulation, Optical testing

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Proceedings Article | 15 October 2012 Paper

Examination and optimizing of a liquid crystal display used as spatial light modulator concerning the fringing field effect

Christian Lingel, Tobias Haist, Wolfgang Osten

Proceedings Volume 8490, 84900H (2012) https://doi.org/10.1117/12.929707

KEYWORDS: Diffraction, Diffraction gratings, LCDs, Spatial light modulators, Polarizers, Optimization (mathematics), Phase shift keying, Molecules, Cameras, Quantization

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Proceedings Article | 13 September 2012 Paper

A 14-channel multipoint vibrometry system using dynamic holography

Tobias Haist, Christian Lingel, Wolfgang Osten, Marcus Winter, Moritz Giesen, Christian Rembe

Proceedings Volume 8494, 849406 (2012) https://doi.org/10.1117/12.929734

KEYWORDS: Holograms, Diffraction, Modulation, Vibrometry, Holography, Phase shift keying, Liquid crystal on silicon, Interferometry, Spatial light modulators, Modulators

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Proceedings Article | 13 September 2012 Paper

Holographic combination of low-resolution Shack-Hartmann sensor and holography-based modal Zernike wavefront sensor

Shihao Dong, Tobias Haist, Wolfgang Osten, Thomas Ruppel, Oliver Sawodny

Proceedings Volume 8447, 84473Y (2012) https://doi.org/10.1117/12.925899

KEYWORDS: Sensors, Wavefront sensors, Wavefronts, Holograms, Holography, Diffraction, Optical design, Signal detection, Adaptive optics, Turbulence

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SPIE Journal Paper | 5 June 2012

Genetic programming applied to automatic algorithm design in multi-scale inspection systems

Avinash Burla, Tobias Haist, Wolfram Lyda, Wolfgang Osten

OE, Vol. 51, Issue 6, 067001, (June 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.6.067001

KEYWORDS: Genetics, Computer programming, Inspection, Detection and tracking algorithms, Binary data, Evolutionary algorithms, Sensors, Defect detection, Algorithm development, Optical engineering

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Proceedings Article | 5 May 2012 Paper

SLM-based microscopy

Malte Hasler, Tobias Haist, Wolfgang Osten

Proceedings Volume 8430, 84300V (2012) https://doi.org/10.1117/12.923213

KEYWORDS: Spatial light modulators, Microscopes, Phase contrast, Microscopy, Aberration correction, Objectives, Computer generated holography, Holograms, Cameras, Confocal microscopy

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SPIE Journal Paper | 6 February 2012

Vertical differential interference contrast

Michael Warber, Tobias Haist, Malte Hasler, Wolfgang Osten

OE, Vol. 51, Issue 1, 013204, (February 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.1.013204

KEYWORDS: Phase contrast, Point spread functions, Microscopes, Diffraction, Visualization, Spatial light modulators, Superposition, Modulators, Optical engineering, Digital image correlation

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Proceedings Article | 14 September 2011 Paper

Response analysis and experimental results of holography-based modal Zernike wavefront sensor

Shihao Dong, Tobias Haist, Wolfgang Osten, Thomas Ruppel, Oliver Sawodny

Proceedings Volume 8165, 816506 (2011) https://doi.org/10.1117/12.891808

KEYWORDS: Sensors, Holograms, Wavefront sensors, Fourier transforms, Atmospheric modeling, Turbulence, Holography, Atmospheric sensing, Wavefronts, Calibration

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Proceedings Article | 9 June 2011 Paper

Vertical differential interference contrast using SLMs

Michael Warber, Malte Hasler, Tobias Haist, Wolfgang Osten

Proceedings Volume 8086, 80861E (2011) https://doi.org/10.1117/12.889889

KEYWORDS: Phase contrast, Spatial light modulators, Microscopes, Point spread functions, Digital image correlation, Visualization, Digital imaging, Microscopy, Information visualization, Image quality

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Proceedings Article | 27 May 2011 Paper

SLM-based multipoint vibrometry

Tobias Haist, Alena Tarbeyevskaya, Michael Warber, Wolfgang Osten, Christian Rembe, Mario Ludwig, Wilhelm Stork

Proceedings Volume 8082, 80821V (2011) https://doi.org/10.1117/12.889337

KEYWORDS: Holograms, Sensors, LCDs, Diffraction, Point spread functions, Vibrometry, Multiplexing, Spatial light modulators, Heterodyning, Interferometry

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Proceedings Article | 23 May 2011 Paper

Assistant systems for efficient multiscale measurement and inspection

Avinash Burla, Tobias Haist, Wolfram Lyda, Mohamed Hassanine Aissa, Wolfgang Osten

Proceedings Volume 8082, 808202 (2011) https://doi.org/10.1117/12.889344

KEYWORDS: Sensors, Inspection, Defect detection, Image processing, Genetic algorithms, Binary data, Genetics, Optical inspection, Microscopes, Detection and tracking algorithms

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SPIE Journal Paper | 1 April 2011

Fourier descriptors for defect indication in a multiscale and multisensor measurement system

Avinash Burla, Tobias Haist, Wolfram Lyda, Wolfgang Osten

OE, Vol. 50, Issue 04, 043603, (April 2011) https://doi.org/10.1117/12.10.1117/1.3562319

KEYWORDS: Lenses, Microlens array, Sensors, Confocal microscopy, Microscopes, Defect detection, Inspection, Microlens, Optical engineering, Monochromatic aberrations

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Proceedings Article | 8 September 2010 Paper

Rapid ideal template creation for the inspection of MEMS based on self-similarity characteristics

Avinash Burla, Tobias Haist, Wolfram Lyda, Anto Yesuadimai Michael, Wolfgang Osten

Proceedings Volume 7798, 77981W (2010) https://doi.org/10.1117/12.860359

KEYWORDS: Image segmentation, Microelectromechanical systems, Sensors, Calibration, Inspection, Image processing algorithms and systems, Optical resolution, Image processing, Actuators, Edge detection

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Proceedings Article | 31 August 2010 Open Access

Learning by playing: how to create the perfect learning game for and with optics

Tobias Haist, Avinash Burla

Proceedings Volume 7783, 77830E (2010) https://doi.org/10.1117/12.860430

KEYWORDS: Polarization, Projection systems, RGB color model, Polarizers, Birefringence, Photography, Outreach programs, Current controlled current source, Negative feedback, Distortion

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Proceedings Article | 2 August 2010 Paper

An assistance system for the selection of sensors in multi-scale measurement systems

Avinash Burla, Tobias Haist, Wolfram Lyda, Wolfgang Osten

Proceedings Volume 7791, 77910I (2010) https://doi.org/10.1117/12.860368

KEYWORDS: Sensors, Inspection, Cameras, Computing systems, Optical inspection, Imaging systems, Systems modeling, Light sources and illumination, Optical testing, Defect detection

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Proceedings Article | 14 May 2010 Paper

Automated multiscale measurement system for MEMS characterisation

W. Lyda, A. Burla, T. Haist, J. Zimmermann, W. Osten, O. Sawodny

Proceedings Volume 7718, 77180G (2010) https://doi.org/10.1117/12.853819

KEYWORDS: Sensors, Microelectromechanical systems, Inspection, Calibration, Confocal microscopy, Image segmentation, Image processing, Pollution, Microscopes, Microlens array

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Proceedings Article | 24 August 2009 Paper

SLM-based phase-contrast filtering for single and multiple image acquisition

Michael Warber, Susanne Zwick, Malte Hasler, Tobias Haist, Wolfgang Osten

Proceedings Volume 7442, 74420E (2009) https://doi.org/10.1117/12.825945

KEYWORDS: Phase contrast, Spatial light modulators, Image filtering, Phase shifts, Image processing, Microscopes, Image enhancement, Optical filters, Computer generated holography, Image contrast enhancement

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SPIE Journal Paper | 1 April 2009

Model-free method for measuring the full Jones matrix of reflective liquid-crystal displays

Christian Kohler, Tobias Haist, Wolfgang Osten

OE, Vol. 48, Issue 04, 044002, (April 2009) https://doi.org/10.1117/12.10.1117/1.3119309

KEYWORDS: LCDs, Phase measurement, Reflectivity, Polarizers, Polarization, Liquid crystals, Jones matrices, Reflective displays, Jones vectors, Phase shifts

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Proceedings Article | 3 September 2008 Paper

Ultra-fast wave-optical computing

Tobias Haist

Proceedings Volume 7072, 70720M (2008) https://doi.org/10.1117/12.794843

KEYWORDS: Sensors, Switches, Ultrafast phenomena, Nickel, Interferometry, Superposition, Optical computing, Actinium, Signal detection, Fiber optics sensors

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Proceedings Article | 11 August 2008 Paper

Scene-based wavefront correction with spatial light modulators

Tobias Haist, Jan Hafner, Michael Warber, Wolfgang Osten

Proceedings Volume 7064, 70640M (2008) https://doi.org/10.1117/12.794860

KEYWORDS: Wavefronts, Spatial light modulators, Microscopy, Microscopes, Wavefront sensors, Sensors, Aberration correction, Astronomy, Modulators, LCDs

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Proceedings Article | 25 January 2008 Paper

Holographic optical tweezers with real-time hologram calculation using a phase-only modulating LCOS-based SLM at 1064 nm

Andreas Hermerschmidt, Sven Krüger, Tobias Haist, Susanne Zwick, Michael Warber, Wolfgang Osten

Proceedings Volume 6905, 690508 (2008) https://doi.org/10.1117/12.764649

KEYWORDS: Holograms, Holography, Microscopes, Spatial light modulators, Diffraction, Objectives, Particles, Optical tweezers, Phase modulation, Visualization

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Proceedings Article | 18 June 2007 Paper

Realisation of a holographic microlaser scalpel using a digital micromirror device

Susanne Zwick, Michael Warber, Tobias Haist, Wolfgang Osten

Proceedings Volume 6616, 66160N (2007) https://doi.org/10.1117/12.727489

KEYWORDS: Holograms, Digital micromirror devices, Holography, Spatial light modulators, Diffraction, Optical tweezers, Fourier transforms, Ultraviolet radiation, Visualization, Telescopes

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Proceedings Article | 14 August 2006 Paper

Wavefront sensing by an aperiodic diffractive microlens array

Lars Seifert, Thomas Ruppel, Tobias Haist, Wolfgang Osten

Proceedings Volume 6293, 629302 (2006) https://doi.org/10.1117/12.677845

KEYWORDS: Sensors, Microlens array, Microlens, Wavefront sensors, Wavefronts, Cameras, CCD cameras, Distance measurement, Calibration, Spherical lenses

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Proceedings Article | 18 August 2005 Paper

Fast hologram computation and aberration control for holographic tweezers

M. Reicherter, T. Haist, S. Zwick, A. Burla, L. Seifert, W. Osten

Proceedings Volume 5930, 59301Y (2005) https://doi.org/10.1117/12.617040

KEYWORDS: Holograms, Holography, LCDs, Visualization, Particles, Spatial light modulators, Optical tweezers, Semiconductor lasers, Phase contrast, Modulators

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Proceedings Article | 10 September 2004 Paper

Dynamic correction of aberrations in microscopic imaging systems using an artificial point source

Marcus Reicherter, Witold Górski, Tobias Haist, Wolfgang Osten

Proceedings Volume 5462, (2004) https://doi.org/10.1117/12.544115

KEYWORDS: Particles, Wavefronts, Spherical lenses, LCDs, Interferometry, Holograms, Microscopes, Imaging systems, Holography, Objectives

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Proceedings Article | 23 October 2003 Paper

Dynamic holography and its application in measurement systems

Tobias Haist, W. Osten, M. Reicherter, J. Liesener, L. Seifert

Proceedings Volume 5202, (2003) https://doi.org/10.1117/12.501511

KEYWORDS: Holograms, Holography, Spatial light modulators, Digital holography, Microlens, Wavefronts, Particles, LCDs, Sensors, CCD image sensors

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Proceedings Article | 14 October 2003 Paper

Advantages of holographic optical tweezers

Marcus Reicherter, Jan Liesener, Tobias Haist, Hans Tiziani

Proceedings Volume 5143, (2003) https://doi.org/10.1117/12.499556

KEYWORDS: Particles, LCDs, Holograms, Holography, Optical tweezers, Spatial light modulators, Optically addressed spatial light modulators, Microscopes, Modulators, Mirrors

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Proceedings Article | 8 November 2001 Paper

Application of SLMs for optical metrology

Hans Tiziani, Tobias Haist, J. Liesener, M. Reicherter, L. Seifert

Proceedings Volume 4457, (2001) https://doi.org/10.1117/12.447740

KEYWORDS: LCDs, Microlens array, Microlens, Holograms, Diffraction, Wavefronts, Cameras, Spatial light modulators, Sensors, Optical filters

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Proceedings Article | 2 November 2000 Paper

Surface and defect analysis using spatial light modulators

Hans Tiziani, Tobias Haist

Proceedings Volume 4113, (2000) https://doi.org/10.1117/12.405865

KEYWORDS: Cameras, Defect detection, 3D image processing, Joint transforms, 3D metrology, Visualization, Spatial light modulators, Near field optics, Moire patterns, Phase contrast

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Proceedings Article | 9 September 1999 Paper

Single-frame evaluation of object-adapted fringes

Tobias Haist, Ernst Wagemann, Hans Tiziani

Proceedings Volume 3823, (1999) https://doi.org/10.1117/12.361000

KEYWORDS: LCDs, CCD cameras, Moire patterns, Cameras, Reflectivity, Charge-coupled devices, Photovoltaics, Information operations, Optical filters, Image filtering

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Proceedings Article | 17 September 1997 Paper

Fast positioning of noncooperative objects

Tobias Haist, Hans Tiziani

Proceedings Volume 3098, (1997) https://doi.org/10.1117/12.281187

KEYWORDS: Optical correlators, Binary data, 3D image processing, Joint transforms, Fourier transforms, LCDs, Visualization, Nonlinear filtering, Stray light, 3D modeling

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Showing 5 of 61 publications

Conference Committee Involvement (10)

Interferometry XXI

24 August 2022 | San Diego, California, United States

Interferometry XX

24 August 2020 | Online Only, California, United States

Interferometry XIX

21 August 2018 | San Diego, California, United States

Digital Optics for Immersive Displays (DOID18)

24 April 2018 | Strasbourg, France

Interferometry XVIII

30 August 2016 | San Diego, California, United States

Showing 5 of 10 Conference Committees

Course Instructor

SC1216: Using Spatial Light Modulators

This course introduces the application of pixelated spatial light modulators (SLM) for imaging and non-imaging applications. First, a review of the different commercially available SLM technologies with their benefits, shortcomings and all relevant parameters will be provided. Also, the addressing of the elements and their characterization is described. Then, focus will be laid on the usage as dynamic diffractive/holographic elements. The attendee will be reminded of the most necessary issues from diffraction theory, linear systems and Fourier optics before learning how to compute and optimize holograms/diffractive optical elements. Finally the applications patterns that enable you to employ SLMs for innovative new designs will be described and we will practice the utilization of these patterns for different optical systems.

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