Mr. Magnus Elmqvist Profile

Magnus Elmqvist

at Swedish Defence Research Agency

SPIE Involvement:

Author

Publications (18)

Proceedings Article | 1 November 2024 Presentation + Paper

Laser in support for effective operation of active and passive EO systems

Ove Steinvall, Magnus Elmqvist, Magnus Pettersson, Lars Allard

Proceedings Volume 13200, 1320006 (2024) https://doi.org/10.1117/12.3029842

KEYWORDS: LIDAR, Visibility, Signal attenuation, Visibility through fog, Reflectivity, Aerosols, Clouds, Atmospheric particles, Backscatter, Laser range finders

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Proceedings Article | 19 November 2012 Paper

Identification of handheld objects and human activities in active and passive imaging

Ove Steinvall, Magnus Elmqvist, Tomas Chevalier

Proceedings Volume 8542, 854206 (2012) https://doi.org/10.1117/12.976034

KEYWORDS: Turbulence, Sensors, Target recognition, Firearms, Long wavelength infrared, Short wave infrared radiation, Infrared imaging, Cameras, Imaging systems, Video

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Proceedings Article | 19 November 2012 Paper

Measurement and modeling of laser range profiling of small maritime targets

Ove Steinvall, Magnus Elmqvist, Tomas Chevalier, Carl Brännlund

Proceedings Volume 8542, 85420I (2012) https://doi.org/10.1117/12.970271

KEYWORDS: Sensors, Profiling, Target detection, LIDAR, Signal to noise ratio, Reflectivity, Radar, Systems modeling, Laser range finders, 3D modeling

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Proceedings Article | 26 May 2012 Paper

Slant path range gated imaging of static and moving targets

Ove Steinvall, Magnus Elmqvist, Kjell Karlsson, Ove Gustafsson, Tomas Chevalier

Proceedings Volume 8379, 83790W (2012) https://doi.org/10.1117/12.919101

KEYWORDS: Turbulence, Sensors, Spatial resolution, Image resolution, Target recognition, Cameras, Imaging systems, Gated imaging, Speckle, Video

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Proceedings Article | 5 October 2011 Paper

See around the corner using active imaging

Ove Steinvall, Magnus Elmqvist, Håkan Larsson

Proceedings Volume 8186, 818605 (2011) https://doi.org/10.1117/12.893605

KEYWORDS: Reflection, Reflectivity, Mirrors, Sensors, Imaging systems, Glasses, Receivers, Cameras, Buildings, Radar

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Proceedings Article | 10 May 2011 Paper

Slant path 1.5 µm range gated imaging close to ground

Ove Steinvall, Magnus Elmqvist, Kjell Karlsson, Ove Gustafsson, Tomas Chevalier

Proceedings Volume 8037, 803703 (2011) https://doi.org/10.1117/12.883364

KEYWORDS: Turbulence, Spatial resolution, Sensors, Speckle, Image resolution, Receivers, Gated imaging, Image quality, Temperature metrology, Cameras

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Proceedings Article | 9 October 2010 Paper

Modeling of 1.5 um range gated imaging for small surface vessel identification

Richard Espinola, Ove Steinvall, Magnus Elmquist, Kjell Karlsson

Proceedings Volume 7835, 78350B (2010) https://doi.org/10.1117/12.865076

KEYWORDS: Sensors, Target recognition, Performance modeling, Imaging systems, Short wave infrared radiation, Contrast transfer function, Systems modeling, Gated imaging, Visual process modeling, Sensor performance

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Proceedings Article | 29 April 2010 Paper

Laser imaging of small surface vessels and people at sea

Ove Steinvall, Magnus Elmqvist, Kjell Karlsson, Håkan Larsson, Maria Axelsson

Proceedings Volume 7684, 768417 (2010) https://doi.org/10.1117/12.849388

KEYWORDS: Reflectivity, Target recognition, Image segmentation, Target detection, Imaging systems, Cameras, Infrared imaging, Sensors, Laser range finders, Turbulence

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Proceedings Article | 17 September 2009 Paper

Evaluation of biological aerosol stand-off detection at a field trial

Per Jonsson, Magnus Elmqvist, Ove Gustafsson, Fredrik Kullander, Rolf Persson, Göran Olofsson, Torbjörn Tjärnhage, Øystein Farsund, Trym Vegard Haavardsholm, Gunnar Rustad

Proceedings Volume 7484, 74840I (2009) https://doi.org/10.1117/12.830401

KEYWORDS: LIDAR, Aerosols, Particles, Ultraviolet radiation, Atmospheric particles, Luminescence, Laser induced fluorescence, Sensors, Backscatter, Curtains

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Proceedings Article | 2 October 2008 Paper

Mono- and bi-static SWIR range-gated imaging experiments for ground applications

Endre Repasi, Peter Lutzmann, Ove Steinvall, Magnus Elmqvist

Proceedings Volume 7114, 71140D (2008) https://doi.org/10.1117/12.799816

KEYWORDS: Cameras, Imaging systems, Thermography, Long wavelength infrared, Mid-IR, Short wave infrared radiation, Signal attenuation, Infrared imaging, Sensors, Gated imaging

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Proceedings Article | 12 June 2007 Paper

Performance modeling and simulation of range-gated imaging systems

Ove Steinvall, Tomas Chevalier, Pierre Andersson, Magnus Elmqvist

Proceedings Volume 6542, 654218 (2007) https://doi.org/10.1117/12.718575

KEYWORDS: Speckle, Turbulence, Modulation transfer functions, Signal to noise ratio, Imaging systems, Image quality, Sensors, 3D modeling, Scintillation, 3D image reconstruction

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Proceedings Article | 14 May 2007 Paper

Overview of range gated imaging at FOI

Ove Steinvall, Pierre Andersson, Magnus Elmqvist, Michael Tulldahl

Proceedings Volume 6542, 654216 (2007) https://doi.org/10.1117/12.719191

KEYWORDS: Gated imaging, Imaging systems, Target detection, Sensors, LIDAR, Cameras, Reflectivity, Target recognition, Thermography, 3D image reconstruction

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Proceedings Article | 30 September 2006 Paper

Image quality for range-gated systems during different ranges atmospheric conditions

Ove Steinvall, Pierre Andersson, Magnus Elmquist

Proceedings Volume 6396, 639607 (2006) https://doi.org/10.1117/12.689831

KEYWORDS: Speckle, Turbulence, Image quality, Receivers, Modulation transfer functions, Sensors, Image resolution, Signal to noise ratio, Imaging systems, Aerosols

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Proceedings Article | 17 May 2006 Paper

Coordinated multi-wavelength laser system propagation experiments

Ove Steinvall, Lars Sjöqvist, Folke Berglund, Lars Allard, Tomas Larsson, Kjell Karlsson, Frank Gustafsson, Fredrik Kullander, Per Sakari, Pierre Andersson, Magnus Elmquist

Proceedings Volume 6215, 62150E (2006) https://doi.org/10.1117/12.665449

KEYWORDS: Turbulence, Scintillation, Cameras, Imaging systems, Sensors, Atmospheric propagation, Directed infrared countermeasures, Speckle, Laser systems engineering, Image quality

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Proceedings Article | 13 September 2004 Paper

Methods for recognition of natural and man-made objects using laser radar data

Christina Groenwall, Tomas Chevalier, Asa Persson, Magnus Elmqvist, Simon Ahlberg, Lena Klasen, Pierre Andersson

Proceedings Volume 5412, (2004) https://doi.org/10.1117/12.542055

KEYWORDS: Stereolithography, Lithium, LIDAR, Systems modeling, Reconstruction algorithms, Detection and tracking algorithms, Imaging systems, Laser systems engineering, 3D modeling, Data modeling

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Proceedings Article | 13 September 2004 Paper

3D laser sensing at FOI: overview and a system perspective

Ove Steinvall, Lena Klasen, Christina Gronwall, Ulf Soderman, Simon Ahlberg, Asa Persson, Magnus Elmqvist, Hakan Larsson, Dietmar Letalick, Pierre Andersson, Tomas Carlsson, Markus Henriksson

Proceedings Volume 5412, (2004) https://doi.org/10.1117/12.553808

KEYWORDS: Sensors, LIDAR, Target recognition, Target detection, 3D modeling, Staring arrays, Laser systems engineering, Weapons, Eye, Environmental sensing

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Proceedings Article | 13 September 2004 Paper

Three-dimensional environment models from airborne laser radar data

Ulf Soderman, Simon Ahlberg, Magnus Elmqvist, Asa Persson

Proceedings Volume 5412, (2004) https://doi.org/10.1117/12.542487

KEYWORDS: 3D modeling, Data modeling, Buildings, Systems modeling, RGB color model, LIDAR, Data processing, Laser systems engineering, Visual process modeling, Visualization

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Proceedings Article | 29 July 2002 Paper

Gated viewing in the atmosphere: a study of performance limits

Lena Klasen, Ove Steinvall, Goeran Bolander, Magnus Elmqvist

Proceedings Volume 4723, (2002) https://doi.org/10.1117/12.476416

KEYWORDS: Signal to noise ratio, Turbulence, Cameras, Image processing, Imaging systems, Target recognition, Image enhancement, Image quality, Image resolution, Scintillation

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The main purpose of the work presented here is to study the potential for an active imaging system for target recognition at long distances. This work is motivated by the fact that there are a number of outdoor imaging needs where conventional passive electro optical (EO) and infrared (IR) imaging systems are limited due to lack of photons, disturbing background, obscurants or bad weather. With a pulsed illuminating source, several of these problems are overcome. Using a laser for target illumination, target recognition at 10's of km can be achieved. Powerful diode pumped lasers and camera tubes with high spatial and time resolution will make this technique an interesting complement to passive EO imaging. Beside military applications, civilian applications of gated viewing for search and rescue, vehicle enhanced vision and other applications are in progress. To study the performance limitations of gated viewing systems due to camera, optics and the atmosphere an experimental system was developed. Measurements up to 10 km were made. The measurements were taken at the wavelength 532 nm. To extrapolate the results to future system performance at an eye safe wavelength, 1.5 micrometers nm, a theoretical performance model was developed. This model takes into account the camera and atmospheric influence on resolution and image quality, measured as a signal-to-noise-ratio, SNR. The result indicates turbulence influence, in agreement with the modeling. Different techniques were tested for image quality improvement and the best results were obtained by applying several processing techniques to the images. Moreover, the tests showed that turbulence seriously limits the resolution for horizontal paths close to the ground. A tactical system at 1.5 micrometers should have better performance than the used 532 nm in atmospheric-limited applications close to ground level. The potential to use existing laser range finders and the eye safety issue motivates the future use of 1.5 micrometers for gated viewing.

Showing 5 of 18 publications

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