Prof. Mikael Sjödahl Profile

Prof. Mikael Sjödahl

at Lulea Univ of Technology

SPIE Involvement:

Conference Program Committee | Author

Publications (35)

Proceedings Article | 18 June 2024 Presentation + Paper

Refocus criterion in dual-wavelength digital holographic interferometry for accurate shape measurement

M. Sjödahl, P. Picart

Proceedings Volume 12997, 129970G (2024) https://doi.org/10.1117/12.3022046

KEYWORDS: Speckle, Correlation function, Holographic interferometry, Digital holography, 3D image reconstruction, Sensors, Simulations, Phase unwrapping, Motion measurement, Speckle pattern

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Proceedings Article | 20 May 2022 Presentation

Towards industrial applications of optical in-line measurement of geometry

Mikael Sjödahl

Proceedings Volume PC12137, PC1213702 (2022) https://doi.org/10.1117/12.2625565

KEYWORDS: Holography, Optics manufacturing, Optical testing, Photogrammetry, Inspection, Sensors, Multiplexing, Laser systems engineering, Speckle, Quality measurement

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Automatic control of the geometry of manufactured components is a cornerstone in the Industry 4.0 transfer that still constitutes an elusive goal. There are however some full-field optical techniques that in combination with optimized software have started to make the transition from the measurement room out to the production line and are able to generate real-time measures of sufficient quality. In this presentation two such techniques are reviewed together with challenges that still remains to be solved before a full implementation is possible. Short-range photogrammetry is a technique that utilizes the explosive development of high-resolution detectors to measure shape from differences in perspective observed in two or more cameras. As a non-interferometric technique, it relies on the presence of structure on the surface of the component that can be identified from different views. With present day technology it has been shown that it is possible to reach a precision of roughly 10-4 of the measurement volume in serial production. Another technique that has the potential to make the same transition is multiplexed multi-wavelength holography. Historically phase wrapping has been seen as an obstacle to apply dual-wavelength holography on generally shaped objects, which has pushed the technique towards wavelength scanning or coherence-gating and scanning. However, new approaches in software have made multiplexed multi-wavelength holography attractive for use also in an industrial environment, which is demonstrated by the use of a specially designed three-wavelength pulsed laser system. The precision achievable is comparable or slightly better than for photogrammetry and the robustness is sufficient. Despite the fundamental differences in technology both techniques require for its realization the same software steps to generate absolute measures, which include object identification, alignment, virtual fixturing and calculation of absolute measures. In the presentation the role of each of these steps are described in some detail.

Proceedings Article | 7 September 2018 Paper

Comparison between process simulation and deformation measured by defocused speckle photography

Joel Wahl, Per Gren, Per Bergström, Torbjörn Lindbäck, Malin Magnusson, Kristina Domeij, Mikael Sjödahl

Proceedings Volume 10834, 108341K (2018) https://doi.org/10.1117/12.2319384

KEYWORDS: Speckle, Sensors, Optical simulations, Photography, Metals, Laser processing, Speckle interferometry, Titanium, Cameras, Computer simulations

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Proceedings Article | 7 September 2018 Paper

Measurement of selective species concentration using spectroscopic holography

Eynas Amer, Per Gren, Kerstin Ramser, Mikael Sjödahl

Proceedings Volume 10834, 108340P (2018) https://doi.org/10.1117/12.2319386

KEYWORDS: Holography, Laser induced fluorescence, Molecules, Methane, Spectroscopy, Raman scattering, Raman spectroscopy, Holograms, Combustion, Polarization

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SPIE Journal Paper | 22 May 2018

Virtual projective shape matching in targetless CAD-based close-range photogrammetry for efficient estimation of specific deviations

Per Bergström, Michael Fergusson, Mikael Sjödahl

OE, Vol. 57, Issue 05, 053110, (May 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.5.053110

KEYWORDS: Cameras, Computer aided design, Solid modeling, Photogrammetry, Inspection, 3D modeling, Imaging systems, Calibration, RGB color model, Optical engineering

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Proceedings Article | 24 August 2015 Paper

Single-shot dual-polarization holography: measurement of the polarization state of a magnetic sample

Davood Khodadad, Eynas Amer, Per Gren, Emil Melander, Emil Hällstig, Mikael Sjödahl

Proceedings Volume 9660, 96601E (2015) https://doi.org/10.1117/12.2189782

KEYWORDS: Polarization, Digital holography, Holography, Magnetism, Mirrors, Jones vectors, Sensors, Calibration, Multiplexing, Beam splitters

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Proceedings Article | 24 August 2015 Paper

Local strain field measurement using phase gradient estimation from holographic speckle correlation

Mikael Sjödahl, Yiling Li

Proceedings Volume 9660, 966004 (2015) https://doi.org/10.1117/12.2196979

KEYWORDS: Speckle, Electroluminescent displays, Phase measurement, Sensors, Scattering, Digital holography, Imaging systems, Holography, Correlation function, Quality measurement

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Proceedings Article | 24 August 2015 Paper

Stimulated Raman scattering imaging for studying specific species

Eynas Amer, Per Gren, Mikael Sjödahl

Proceedings Volume 9660, 96600V (2015) https://doi.org/10.1117/12.2189460

KEYWORDS: Modulation, Raman scattering, Polymethylmethacrylate, Raman spectroscopy, Molecules, Optical parametric oscillators, Fourier transforms, Head, Signal detection, Spatial frequencies

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Proceedings Article | 18 August 2014 Paper

Dual-wavelength digital holography: single shot calibration

Davood Khodadad, Per Bergström, Emil Hällstig, Mikael Sjödahl

Proceedings Volume 9203, 920305 (2014) https://doi.org/10.1117/12.2062101

KEYWORDS: Speckle, Calibration, Holograms, Digital holography, Chromatic aberrations, Wave propagation, Beam splitters, Spatial frequencies, Sensors, Environmental sensing

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SPIE Journal Paper | 28 June 2013 Open Access

Dual-wavelength digital holographic shape measurement using speckle movements and phase gradients

Davood Khodadad, Emil Hallstig, Mikael Sjödahl

OE, Vol. 52, Issue 10, 101912, (June 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.10.101912

KEYWORDS: Speckle, Digital holography, Holography, Holograms, Speckle pattern, Sensors, Phase measurement, Scattering, Wave propagation, Optical engineering

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SPIE Journal Paper | 23 May 2013 Open Access

Dynamic properties of multispectral speckles in digital holography and image correlation

Mikael Sjodahl

OE, Vol. 52, Issue 10, 101908, (May 2013) https://doi.org/10.1117/12.10.1117/1.OE.52.10.101908

KEYWORDS: Speckle, Digital holography, Sensors, Digital image correlation, Digital imaging, Interferometry, Speckle pattern, Imaging systems, Scattering, Spatial frequencies

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Proceedings Article | 13 May 2013 Paper

Shape reconstruction using dual wavelength digital holography and speckle movements

Davood Khodadad, Emil Hällstig, Mikael Sjödahl

Proceedings Volume 8788, 87880I (2013) https://doi.org/10.1117/12.2020471

KEYWORDS: Speckle, Digital holography, Distance measurement, Sensors, Holograms, Wave propagation, Beam splitters, Interferometry, Phase interferometry, Speckle pattern

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Proceedings Article | 13 May 2013 Paper

Digital holographic microscopy for the study of nano-fibers

Hamdy Wahba, Mikael Sjödahl, Per Gren, Erik Olsson

Proceedings Volume 8788, 87883F (2013) https://doi.org/10.1117/12.2020579

KEYWORDS: Optical fibers, Digital holography, Holography, Holograms, Refractive index, Microscopy, 3D image reconstruction, 3D acquisition, Video, Cameras

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Proceedings Article | 13 May 2013 Paper

Stimulated LIF studied using pulsed digital holography and modelling

Eynas Amer, Jonas Stenvall, Per Gren, Mikael Sjödahl

Proceedings Volume 8788, 87883M (2013) https://doi.org/10.1117/12.2020505

KEYWORDS: Laser beam diagnostics, Laser induced fluorescence, Digital holography, Luminescence, Molecules, Holograms, Beam splitters, Ultraviolet radiation, Holography, Spectroscopy

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Proceedings Article | 25 September 2012 Paper

Multi-spectral speckles: theory and applications

Mikael Sjödahl, Emil Hallstig, Davood Khodadad

Proceedings Volume 8413, 841306 (2012) https://doi.org/10.1117/12.981665

KEYWORDS: Speckle, Sensors, Speckle pattern, Interferometry, Scattering, Spatial frequencies, Imaging systems, Metrology, Digital holography, Phase measurement

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SPIE Journal Paper | 8 March 2012 Open Access

Holographic measurement of thermal distortion during laser spot welding

Ingemar Eriksson, Peter Haglund, John Powell, Mikael Sjödahl, Alexander Kaplan

OE, Vol. 51, Issue 03, 030501, (March 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.3.030501

KEYWORDS: Distortion, Holography, Laser welding, Digital holography, Cameras, Holographic interferometry, Nd:YAG lasers, Pulsed laser operation, Interferometers, Laser applications

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SPIE Journal Paper | 1 October 2011

Shape verification using dual-wavelength holographic interferometry

Per Bergström, Sara Rosendahl, Per Gren, Mikael Sjödahl

OE, Vol. 50, Issue 10, 101503, (October 2011) https://doi.org/10.1117/12.10.1117/1.3572182

KEYWORDS: Digital holography, Holographic interferometry, Holography, Inspection, Sensors, Manufacturing, Reconstruction algorithms, Optical engineering, Diodes, Computer aided design

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Proceedings Article | 27 May 2011 Paper

Dual-wavelength holographic shape measurement with iterative phase unwrapping

Sara Rosendahl, Per Bergström, Per Gren, Mikael Sjödahl

Proceedings Volume 8082, 80820B (2011) https://doi.org/10.1117/12.889424

KEYWORDS: Phase measurement, Reconstruction algorithms, Holography, Digital holography, Manufacturing, Sensors, Inspection, Holograms, Cameras, Semiconductor lasers

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Proceedings Article | 14 September 2010 Paper

Phase errors in speckle reduced laser fringe projection

S, Rosendahl, E. Hällstig, P. Gren, M. Sjödahl

Proceedings Volume 7387, 73871E (2010) https://doi.org/10.1117/12.869659

KEYWORDS: Phase shift keying, Speckle, Modulation, Speckle pattern, Fringe analysis, Error analysis, Cameras, Optical filters, Sensors, Beam splitters

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Proceedings Article | 15 September 2006 Paper

Laser hole drilling process studied using laser speckle correlation

Mikael Sjödahl, Per Gren, Istvan Sárady, Natalia Miroshnicova

Proceedings Volume 6341, 63412M (2006) https://doi.org/10.1117/12.695845

KEYWORDS: Speckle, Laser drilling, Laser processing, Copper, Silver, Nd:YAG lasers, Speckle pattern, Image processing, Digital photography, Sensors

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Proceedings Article | 15 September 2006 Paper

Digital holographic interferometry in a disturbed environment

Henrik Lycksam, Per Gren, Mikael Sjödahl

Proceedings Volume 6341, 634111 (2006) https://doi.org/10.1117/12.695343

KEYWORDS: Holographic interferometry, Photography, Digital holography, Speckle, Light sources, Scattering, Interferometry, Interferometers, Turbulence, Statistical analysis

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Proceedings Article | 7 March 2006 Paper

Mechanical testing using digital speckle photography

Per Synnergren, Mikael Sjoedahl

Proceedings Volume 4101, (2006) https://doi.org/10.1117/12.498442

KEYWORDS: Speckle, X-rays, Digital photography, Digital signal processing, Photography, Speckle pattern, Cameras, Sensors, Imaging systems, Polymers

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Proceedings Article | 7 March 2006 Paper

Fringe formation in a dual-beam symmetric illumination-observation TV holography system: an analysis

Nandigana Krishna Mohan, Angelica Andersson, Mikael Sjoedahl, Nils-Erik Molin

Proceedings Volume 4101, (2006) https://doi.org/10.1117/12.498450

KEYWORDS: Fringe analysis, Holography, Collimation, CCD cameras, Image processing, Speckle, Specular reflections, Phase shifts, 3D image processing, Interferometers

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SPIE Journal Paper | 1 January 2006

Locating primary sound sources in scattering media using multifrequency digital holographic reconstruction

Erik Olsson, Mikael Sjödahl, Lothar Zipser

OE, Vol. 45, Issue 01, 015801, (January 2006) https://doi.org/10.1117/12.10.1117/1.2162032

KEYWORDS: Transducers, Digital holography, Holography, Scattering media, Ultrasonography, Optical engineering, Near field optics, Doppler effect, Laser Doppler velocimetry, Phase measurement

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Proceedings Article | 15 July 2004 Paper

Study of the interaction mechanisms between different materials and pulses from CO2- and Nd:YAG-lasers using digital speckle photography

Natalia Miroshnikova, Olga Yalukova, Mikael Sjödahl, Istvan Sarady

Proceedings Volume 5506, (2004) https://doi.org/10.1117/12.579998

KEYWORDS: Speckle, Digital photography, Nd:YAG lasers, Digital signal processing, Speckle pattern, Photography, CCD cameras, Carbon dioxide lasers, Pulsed laser operation, Visualization

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Proceedings Article | 30 May 2003 Paper

Evaluation of phase objects by pulsed TV holography and defocused speckle displacement

Eva-Lena Johansson, Lars Benckert, Mikael Sjodahl

Proceedings Volume 5144, (2003) https://doi.org/10.1117/12.500582

KEYWORDS: Speckle, Digital photography, Holograms, Holography, Digital holography, Photography, CCD cameras, Sensors, Helium, Nd:YAG lasers

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Proceedings Article | 30 May 2003 Paper

Component forming simulations validated using optical shape measurements

Lars Kinell, Magnus Eriksson, Mikael Sjodahl

Proceedings Volume 5144, (2003) https://doi.org/10.1117/12.500668

KEYWORDS: 3D modeling, Calibration, Optical testing, Projection systems, Finite element methods, Optical simulations, Reverse modeling, 3D metrology, Computer aided design, Solid modeling

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Proceedings Article | 30 May 2003 Paper

Scattered ultrasound fields measured by scanning laser vibrometry

Erik Olsson, Nils-Erik Molin, Mikael Sjodahl, Lothar Zipser, Heinz Franke

Proceedings Volume 5144, (2003) https://doi.org/10.1117/12.500398

KEYWORDS: Ultrasonography, Wave propagation, Transducers, Doppler effect, Reflectors, Laser Doppler velocimetry, Phase measurement, Vibrometry, Holography, Scatter measurement

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Proceedings Article | 27 May 2003 Paper

Speckle correlation used for measuring microstructural changes in paper

Mikael Sjodahl, Linda Larsson

Proceedings Volume 4933, (2003) https://doi.org/10.1117/12.516572

KEYWORDS: Speckle, Humidity, Printing, Speckle pattern, Optical fibers, Scattering, Microscopes, Environmental sensing, Speckle metrology, Packaging

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SPIE Journal Paper | 1 February 2002

Stitching interferometric measurement data for inspection of large optical components

Mikael Sjoedahl, Bozenko Oreb

OE, Vol. 41, Issue 02, (February 2002) https://doi.org/10.1117/12.10.1117/1.1430727

KEYWORDS: Signal to noise ratio, Interferometers, Interferometry, Matrices, Inspection, Optical components, Optical inspection, Optical engineering, Digital filtering, Image processing

SPIE Journal Paper | 1 December 2001

Dual-beam symmetric illumination-observation TV holography system for measurements

Nandigana Krishna Mohan, Angelica Svanbro, Mikael Sjodahl, Nils-Erik Molin

OE, Vol. 40, Issue 12, (December 2001) https://doi.org/10.1117/12.10.1117/1.1418010

KEYWORDS: Holography, CCD cameras, Interferometers, Sensors, Imaging systems, Illumination engineering, Image processing, Collimation, Specular reflections, Optical engineering

Proceedings Article | 13 June 2001 Paper

Combined digital speckle photography (DSP) and interferometry

Nils-Erik Molin, Angelica Svanbro, Per Gren, Mikael Sjoedahl

Proceedings Volume 4317, (2001) https://doi.org/10.1117/12.429579

KEYWORDS: Digital signal processing, Speckle, Digital photography, Photography, Holography, Interferometry, Shearography, Speckle interferometry, Motion measurement, Digital holography

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Proceedings Article | 7 May 1999 Paper

Whole-field speckle strain sensor

Mikael Sjodahl

Proceedings Volume 3740, (1999) https://doi.org/10.1117/12.347769

KEYWORDS: Speckle, Sensors, Speckle pattern, Digital photography, Mirrors, Photography, Digital signal processing, Semiconductor lasers, Mendelevium, Imaging systems

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Proceedings Article | 17 September 1997 Paper

Applications of digital speckle photography in experimental mechanics

Mikael Sjoedahl, Per Synnergren, Peder Johnson

Proceedings Volume 3098, (1997) https://doi.org/10.1117/12.281161

KEYWORDS: Digital photography, Speckle, Photography, Digital signal processing, Cameras, Speckle pattern, Experimental mechanics, CCD cameras, Optical filters, Aluminum

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SPIE Journal Paper | 1 April 1996

Strain and torque measurements on cylindrical objects using the laser speckle strain gauge

Mikael Sjoedahl, Ichirou Yamaguchi

OE, Vol. 35, Issue 04, (April 1996) https://doi.org/10.1117/12.10.1117/1.600606

KEYWORDS: Speckle, Sensors, Optical correlators, Optical engineering, Diffraction, Speckle pattern, Semiconductor lasers, Signal detection, Photodiodes, Laser marking

Showing 5 of 35 publications

Conference Committee Involvement (2)

Optics and Photonics for Advanced Dimensional Metrology III

9 April 2024 | Strasbourg, France

Interferometry XVII: Advanced Applications

19 August 2014 | San Diego, California, United States

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