Dr. Markus Henriksson Profile

Dr. Markus Henriksson

Senior scientist at FOI-Swedish Defence Research Agency

SPIE Involvement:

Conference Program Committee | Author

Publications (44)

Proceedings Article | 19 October 2023 Presentation + Paper

Turbulence characterization and investigation of correlations to meteorological parameters: results from NATO SET-304 field trial in Le Fauga-Mauzac, France

Jens Grundmark, Markus Henriksson

Proceedings Volume 12731, 1273108 (2023) https://doi.org/10.1117/12.2679406

KEYWORDS: Light emitting diodes, Turbulence, Sensors, Cameras, Refractive index, Temperature metrology, Image processing, Temperature sensors, Meteorology, Imaging arrays

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Proceedings Article | 12 September 2021 Presentation + Paper

Mid-infrared photon counting LIDAR using intra-cavity up-conversion

Max Widarsson, Markus Henriksson, Valdas Pasiskevicius, Fredrik Laurell

Proceedings Volume 11868, 1186804 (2021) https://doi.org/10.1117/12.2601750

KEYWORDS: LIDAR, Sensors, Crystals, Nonlinear crystals, Laser crystals, Single photon detectors, Mid-IR, Pulsed laser operation, Photon counting

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Proceedings Article | 12 September 2021 Presentation + Paper

Outdoor target-in-the-loop coherent beam combination using a stochastic parallel gradient descent algorithm

Matts Björck, Markus Henriksson, Lars Sjöqvist

Proceedings Volume 11867, 118670E (2021) https://doi.org/10.1117/12.2599744

KEYWORDS: Retroreflectors, Sensors, Device simulation, Feedback signals, Detection and tracking algorithms, Stochastic processes, Coherent beam combination, Wave propagation, Turbulence

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SPIE Journal Paper | 2 September 2021 Open Access

Laser attenuation in falling snow correlated with measurements of snow particle size distribution

Mattias Rahm, Per Jonsson, Markus Henriksson

OE, Vol. 60, Issue 09, 094102, (September 2021) https://doi.org/10.1117/12.10.1117/1.OE.60.9.094102

KEYWORDS: Scattering, Signal attenuation, Sensors, Particles, Laser scattering, LIDAR, Atmospheric particles, Mie scattering, Panoramic photography, Target detection

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Proceedings Article | 20 September 2020 Presentation + Paper

Photon counting 3D imaging from multiple positions

Per Jonsson, Maria Axelsson, Lars Allard, Fredrik Bissmarck, Markus Henriksson, Mattias Rahm, Lars Sjöqvist

Proceedings Volume 11540, 115400P (2020) https://doi.org/10.1117/12.2573445

KEYWORDS: Photon counting, Stereoscopy, Roads, Clouds, Vegetation, Defense and security, Computer security, Optical sensors, Target recognition, Target detection

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Detecting and identifying objects inside a forest edge on the other side of an open field is an important task in defence and security applications. This can be difficult to achieve with passive imaging sensors because of the partial obscuration by the foliage. High-resolution 3D imaging enables separation of hidden objects from branches and leaves and can provide data for detection, recognition, and identification of partly occluded targets. We use a photon counting lidar system with panoramic scanning to produce high quality 3D data for this task. The FOI system is built around the Princeton Lightwave Inc. (PLI) Falcon detector which is a 32×128 pixel array of InGaAs Geiger-mode avalanche photodiodes. The system operates at 1557 nm and has been designed for suitable resolution at standoff ranges of 1 to 2 km. In this paper, we investigate the detection capability when combining measurements from multiple measurement positions. A field trial has been performed where data from the same scene was collected from different sensor positions. The system was mounted on a car and moved between different positions along a road. The measurements were performed first without and then with vehicles in the target area. The distance to the forest edge varied between from approximately 1.0 to 1.5 km, and the difference of the angle of incidence was approximately 45 degrees from the outer positions along the road. To merge the data from the different positions we apply registration of the data sets using derived point clouds to transform all data into a common coordinate system. Data from the different sensor positions is analyzed by overlaying the derived point clouds from the different positions. We compare data from different viewpoints to data from only one viewpoint. The results show that the combined point clouds from multiples positions covers more of scene than from a single position. We also perform change detection using registered point clouds from the same measurement positions. In the change detection we found the changes we had introduced (vehicles and equipment).

Proceedings Article | 7 October 2019 Presentation + Paper

Optics detection using an avalanche photo diode array and the scanning-slit-method

Daniel Svedbrand, Lars Allard, Magnus Pettersson, Pontus Köhler, Markus Henriksson, Lars Sjökvist

Proceedings Volume 11161, 111610J (2019) https://doi.org/10.1117/12.2531795

KEYWORDS: Diodes, Avalanche photodetectors, Target detection, Optical fabrication, Sensors, Surveillance, Electro optical sensors, Weapons, Sensor performance, Optical scanning

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Proceedings Article | 7 October 2019 Paper

Investigations of incoherent beam combining using stochastic parallel gradient descent with retroreflector target

Markus Henriksson, Carl Brännlund

Proceedings Volume 11161, 1116104 (2019) https://doi.org/10.1117/12.2533022

KEYWORDS: Stochastic processes, Retroreflectors, Collimators, Detection and tracking algorithms, Reflectors

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Proceedings Article | 13 May 2019 Paper

Outdoor single-photon counting panoramic 3D imaging

Markus Henriksson, Lars Allard, Maria Axelsson, Gustav Tolt, Per Jonsson, Lars Sjöqvist

Proceedings Volume 10978, 1097807 (2019) https://doi.org/10.1117/12.2520696

KEYWORDS: Sensors, Panoramic photography, 3D acquisition, LIDAR, Photon counting, 3D image processing

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Proceedings Article | 9 October 2018 Paper

Panoramic single‑photon counting 3D lidar

Markus Henriksson, Lars Allard, Per Jonsson

Proceedings Volume 10796, 1079606 (2018) https://doi.org/10.1117/12.2325691

KEYWORDS: Sensors, LIDAR, Panoramic photography, Pulsed laser operation, Picosecond phenomena, 3D metrology, Cameras, Signal to noise ratio, Super resolution, 3D acquisition

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SPIE Journal Paper | 12 September 2018

Photon-counting panoramic three-dimensional imaging using a Geiger-mode avalanche photodiode array

Markus Henriksson, Per Jonsson

OE, Vol. 57, Issue 09, 093104, (September 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.9.093104

KEYWORDS: Panoramic photography, Cameras, 3D image processing, Sensors, Imaging systems, Pulsed laser operation, Signal to noise ratio, LIDAR, Photon counting, Optical engineering

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SPIE Journal Paper | 13 February 2018 Open Access

Peak detection approaches for time-correlated single-photon counting three-dimensional lidar systems

Gustav Tolt, Christina Grönwall, Markus Henriksson

OE, Vol. 57, Issue 03, 031306, (February 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.3.031306

KEYWORDS: Single photon detectors, LIDAR, Sensors, Detection and tracking algorithms, Expectation maximization algorithms, Signal detection, Target detection, Signal to noise ratio, Optical engineering, Signal processing

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Proceedings Article | 5 October 2017 Paper

Airborne platform effects on lasers and warning sensors

Markus Henriksson, Christian Eisele, Dirk Seiffer, Lars Sjöqvist, Fabio Togna, Marie-Thérèse Velluet

Proceedings Volume 10435, 104350M (2017) https://doi.org/10.1117/12.2277311

KEYWORDS: Directed infrared countermeasures, Turbulence, Modeling, Gases, Laser countermeasures, Airborne laser technology, Sensors, Optical turbulence, Laser beam propagation, Laser beam diagnostics

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Airborne platform effects on lasers and warning sensors (ALWS) has been a European collaborative research project to investigate the effects of platform-related turbulence on optical countermeasure systems, especially missile approach warning systems (MAWS) and directed infrared countermeasures (DIRCM). Field trials have been carried out to study the turbulence effects around a hovering helicopter and behind a turboprop aircraft with engines running on the ground. In addition different methods for modelling the effects have been investigated.

In the helicopter trials significant beam wander, scintillations and beam broadening were experienced by narrow divergence laser beams when passing through the down-wash of the hot engine exhaust gases. The measured effects considerably exceed the effects of atmospheric turbulence. Extraction of turbulence parameters for modelling of DIRCM-relevant scenarios show that in most cases the reduction of jamming power and distortion of jamming waveform can be expected to be small. The reduction of effects of turbulence is mainly related to the larger beam divergence and shorter Rayleigh length of DIRCM lasers compared to the experimental probe beams. Measurements using the turboprop platform confirm that tolerable effects on laser beam properties are found when the laser beam passes through the exhaust 15 m behind the outlet where the exhaust gases are starting to cool down.

Modelling efforts have shown that time-resolved computational fluid dynamics (CFD) calculations can be used to study properties of beam propagation in engine exhaust-related turbulence. Because of computational cost and the problem of validating the CFD results the use for system performance simulations is however difficult.

The hot exhaust gases emitted from aircraft engines create extreme optical turbulence in a local region. The effects on countermeasure system performance depend both on the system parameters and on the threat characteristics. With present-day DIRCM systems, the effects of even severe turbulence are often tolerable.

Proceedings Article | 5 October 2017 Paper

Experimental evaluation of penetration capabilities of a Geiger-mode APD array laser radar system

Per Jonsson, Michael Tulldahl, Julia Hedborg, Markus Henriksson, Lars Sjöqvist

Proceedings Volume 10434, 1043405 (2017) https://doi.org/10.1117/12.2278443

KEYWORDS: LIDAR, Sensors, Signal detection, 3D acquisition, Single photon detectors, Target detection, Laser systems engineering, Avalanche photodiodes, Target recognition, Pulsed laser operation

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Laser radar 3D imaging has the potential to improve target recognition in many scenarios. One case that is challenging for most optical sensors is to recognize targets hidden in vegetation or behind camouflage. The range resolution of timeof- flight 3D sensors allows segmentation of obscuration and target if the surfaces are separated far enough so that they can be resolved as two distances. Systems based on time-correlated single-photon counting (TCSPC) have the potential to resolve surfaces closer to each other compared to laser radar systems based on proportional mode detection technologies and is therefore especially interesting. Photon counting detection is commonly performed with Geigermode Avalanche Photodiodes (GmAPD) that have the disadvantage that they can only detect one photon per laser pulse per pixel. A strong return from an obscuring object may saturate the detector and thus limit the possibility to detect the hidden target even if photons from the target reach the detector. The operational range where good foliage penetration is observed is therefore relatively narrow for GmAPD systems. In this paper we investigate the penetration capability through semi-transparent surfaces for a laser radar with a 128×32 pixel GmAPD array and a 1542 nm wavelength laser operating at a pulse repetition frequency of 90 kHz. In the evaluation a screen was placed behind different canvases with varying transmissions and the detected signals from the surfaces for different laser intensities were measured. The maximum return from the second surface occurs when the total detection probability is around 0.65-0.75 per pulse. At higher laser excitation power the signal from the second surface decreases. To optimize the foliage penetration capability it is thus necessary to adaptively control the laser power to keep the returned signal within this region. In addition to the experimental results, simulations to study the influence of the pulse energy on penetration through foliage in a scene with targets behind vegetation are presented. The optimum detection of targets occurs here at a slightly higher total photon count rate probability because a number of pixel have no obscuration in front the target in their field of view.

Proceedings Article | 29 September 2017 Paper

Temporally resolved refractive index structure parameter measurement

Markus Henriksson, Robin Forsling

Proceedings Volume 10425, 1042503 (2017) https://doi.org/10.1117/12.2278315

KEYWORDS: Refractive index, Optical turbulence, Scintillation, Atmospheric propagation, Measurement devices, Optical testing, Temporal resolution, Light emitting diodes, Photon counting, Picosecond phenomena

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Proceedings Article | 21 October 2016 Paper

Temporal extension of phase screen sequences using proper orthogonal decomposition

Markus Henriksson, Lars Sjöqvist, Jonas Tidström

Proceedings Volume 9989, 99890H (2016) https://doi.org/10.1117/12.2241036

KEYWORDS: Turbulence, Monte Carlo methods, Computer simulations, Optical simulations, Wave propagation, Wavefront sensors, Video, Directed infrared countermeasures, Refractive index, Beam propagation method

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SPIE Journal Paper | 27 September 2016

Continuously scanning time-correlated single-photon-counting single-pixel 3-D lidar

Markus Henriksson, Håkan Larsson, Christina Grönwall, Gustav Tolt

OE, Vol. 56, Issue 03, 031204, (September 2016) https://doi.org/10.1117/12.10.1117/1.OE.56.3.031204

KEYWORDS: Sensors, LIDAR, Pulsed laser operation, 3D acquisition, Clouds, Vegetation, Signal processing, Detector arrays, Distance measurement, Eye

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Proceedings Article | 27 October 2015 Paper

Helicopter engine exhaust rotor downwash effects on laser beams

Markus Henriksson, Lars Sjöqvist, Dirk Seiffer

Proceedings Volume 9650, 96500M (2015) https://doi.org/10.1117/12.2194815

KEYWORDS: Turbulence, Atmospheric turbulence, Atmospheric propagation, Laser beam propagation, Collimation, Gases, Laser countermeasures, Wave propagation, Video, Data modeling

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Proceedings Article | 27 October 2015 Paper

Quantification of helicopter rotor downwash effects on electro-optical defensive aids suites

Dirk Seiffer, Christian Eisele, Markus Henriksson, Lars Sjöqvist, Sebastian Möller, Fabio Togna, Marie-Thérèse Velluet

Proceedings Volume 9650, 96500I (2015) https://doi.org/10.1117/12.2195645

KEYWORDS: Missiles, Gases, Directed infrared countermeasures, Electro optics, Atmospheric propagation, Laser countermeasures, Sensors, Laser systems engineering, Turbulence, Refractive index

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Proceedings Article | 16 October 2015 Paper

3D sensing and imaging for UAVs

Christina Grönwall, Gustav Tolt, Patrik Lif, Håkan Larsson, Fredrik Bissmarck, Michael Tulldahl, Markus Henriksson, Per Wikberg, Mirko Thorstensson

Proceedings Volume 9649, 96490C (2015) https://doi.org/10.1117/12.2192834

KEYWORDS: Unmanned aerial vehicles, Sensors, LIDAR, 3D modeling, 3D acquisition, Visualization, Target detection, Clouds, Signal processing, Data modeling

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Proceedings Article | 16 October 2015 Paper

Reconstruction of time-correlated single-photon counting range profiles of moving objects

Per Jonsson, Julia Hedborg, Markus Henriksson, Lars Sjöqvist

Proceedings Volume 9649, 964905 (2015) https://doi.org/10.1117/12.2194859

KEYWORDS: LIDAR, Pulsed laser operation, Sensors, Rifle scopes, Transceivers, Single photon detectors, Photons, Picosecond phenomena, Time metrology, Target acquisition

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SPIE Journal Paper | 5 August 2015

Numerical laser beam propagation using large eddy simulation of a jet engine flow field

Markus Henriksson, Lars Sjöqvist, Oskar Parmhed, Christer Fureby

OE, Vol. 54, Issue 08, 085101, (August 2015) https://doi.org/10.1117/12.10.1117/1.OE.54.8.085101

KEYWORDS: Laser energy, Laser beam propagation, Optical simulations, Computer simulations, Beam propagation method, Directed infrared countermeasures, Refractive index, Atmospheric propagation, Turbulence, Collimation

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SPIE Journal Paper | 31 March 2014

Scintillation index measurement using time-correlated single-photon counting laser radar

Markus Henriksson, Lars Sjöqvist

OE, Vol. 53, Issue 08, 081902, (March 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.8.081902

KEYWORDS: Scintillation, Sensors, LIDAR, Signal detection, Turbulence, Photodetectors, Photon counting, Laser systems engineering, Optical engineering, Atmospheric turbulence

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Proceedings Article | 25 October 2013 Paper

Combined hostile fire and optics detection

Carl Brännlund, Jonas Tidström, Markus Henriksson, Lars Sjöqvist

Proceedings Volume 8896, 88960I (2013) https://doi.org/10.1117/12.2028846

KEYWORDS: Firearms, Cameras, Sniper detection, Roads, Sensors, Short wave infrared radiation, Reflectors, Optical filters, Weapons, Scintillation

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Proceedings Article | 15 October 2013 Paper

Target discrimination strategies in optics detection

Lars Sjöqvist, Lars Allard, Markus Henriksson, Per Jonsson, Magnus Pettersson

Proceedings Volume 8898, 88980K (2013) https://doi.org/10.1117/12.2029321

KEYWORDS: Polarization, Roads, Target detection, Rifle scopes, Reflectors, Sensors, Polarizers, Defense and security, Optical components, Single photon

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Proceedings Article | 15 October 2013 Paper

Simulation of laser propagation through jet plumes using computational fluid dynamics

Markus Henriksson, Henrik Edefur, Christer Fureby, Oskar Parmhed, Shia-Hui Peng, Lars Sjöqvist, Jonas Tidström, Stefan Wallin

Proceedings Volume 8898, 88980E (2013) https://doi.org/10.1117/12.2028339

KEYWORDS: Directed infrared countermeasures, Laser beam propagation, Refractive index, Laser energy, Turbulence, Atmospheric propagation, Computer simulations, Optical simulations, Computational fluid dynamics, Missiles

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Proceedings Article | 19 November 2012 Paper

Optical reflectance tomography using TCSPC laser radar

Markus Henriksson, Tomas Olofsson, Christina Grönwall, Carl Brännlund, Lars Sjöqvist

Proceedings Volume 8542, 85420E (2012) https://doi.org/10.1117/12.974493

KEYWORDS: Tomography, Sensors, LIDAR, Satellites, Reflectivity, Laser systems engineering, Picosecond phenomena, Photons, Receivers, Unmanned aerial vehicles

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Proceedings Article | 19 May 2012 Paper

Photon counting ladar work at FOI, Sweden

Ove Steinvall, Lars Sjöqvist, Markus Henriksson

Proceedings Volume 8375, 83750C (2012) https://doi.org/10.1117/12.920294

KEYWORDS: Sensors, LIDAR, Photon counting, Pulsed laser operation, Picosecond phenomena, Imaging systems, Profiling, Receivers, Image resolution, Turbulence

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Proceedings Article | 7 October 2011 Paper

Turbulence effects in a horizontal propagation path close to ground: implications for optics detection

Lars Sjöqvist, Lars Allard, Ove Gustafsson, Markus Henriksson, Magnus Pettersson

Proceedings Volume 8187, 81870M (2011) https://doi.org/10.1117/12.898171

KEYWORDS: Turbulence, Scintillation, Sensors, Atmospheric propagation, Laser beam propagation, Laser systems engineering, Wave propagation, Signal detection, Atmospheric turbulence, Atmospheric optics

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Proceedings Article | 7 October 2011 Paper

Markus Henriksson, Lars Sjöqvist

Proceedings Volume 8187, 81870N (2011) https://doi.org/10.1117/12.898032

KEYWORDS: Scintillation, Sensors, LIDAR, Distance measurement, Signal to noise ratio, Turbulence, Picosecond phenomena, Pulsed laser operation, Time metrology, Profiling

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Proceedings Article | 12 October 2010 Paper

Numerical laser beam propagation using a Large Eddy Simulation refractive index field representing a jet engine exhaust

Lars Sjöqvist, Markus Henriksson, Ekaterina Fedina, Christer Fureby

Proceedings Volume 7836, 78360K (2010) https://doi.org/10.1117/12.865031

KEYWORDS: Refractive index, Laser energy, Laser beam propagation, Turbulence, Computer simulations, Optical properties, Wave propagation, Optical simulations, Atmospheric propagation, Zernike polynomials

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Proceedings Article | 12 October 2010 Paper

Laser beam propagation through a full scale aircraft turboprop engine exhaust

Markus Henriksson, Ove Gustafsson, Lars Sjöqvist, Dirk Seiffer, Norbert Wendelstein

Proceedings Volume 7836, 78360L (2010) https://doi.org/10.1117/12.864679

KEYWORDS: Turbulence, Laser beam propagation, Scintillation, Atmospheric propagation, Laser systems engineering, Cameras, Directed infrared countermeasures, Distortion, Sensors, Gases

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Proceedings Article | 1 October 2009 Paper

Wall induced turbulence distortions of optical measurements

Ove Gustafsson, Markus Henriksson, Lars Sjöqvist

Proceedings Volume 7482, 74820E (2009) https://doi.org/10.1117/12.830606

KEYWORDS: Turbulence, Distance measurement, Optical testing, Velocity measurements, Wind measurement, Atmospheric turbulence, Free space optics, Temperature metrology, Clouds, Ultrasonics

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Proceedings Article | 2 October 2008 Paper

Laser beam propagation experiments along and across a jet engine plume

Markus Henriksson, Lars Sjöqvist, Dirk Seiffer, Norbert Wendelstein, Erik Sucher

Proceedings Volume 7115, 71150E (2008) https://doi.org/10.1117/12.799202

KEYWORDS: Laser beam propagation, Atmospheric propagation, Turbulence, Cameras, Scintillation, Imaging systems, Directed infrared countermeasures, Optical testing, Refraction, Telecommunications

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Proceedings Article | 2 October 2008 Paper

Atmospheric turbulence effects in single-photon counting time-of-flight range profiling

Lars Sjöqvist, Christina Grönwall, Markus Henriksson, Per Jonsson, Ove Steinvall

Proceedings Volume 7115, 71150G (2008) https://doi.org/10.1117/12.800241

KEYWORDS: Turbulence, Profiling, Surface plasmons, Atmospheric turbulence, Scintillation, Picosecond phenomena, Photon counting, LIDAR, Target detection, Atmospheric propagation

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Proceedings Article | 2 October 2008 Paper

Tandem PPKTP and ZGP OPO for mid-infrared generation

Markus Henriksson, Lars Sjöqvist, Gustav Strömqvist, Valdas Pasiskevicius, Fredrik Laurell

Proceedings Volume 7115, 71150O (2008) https://doi.org/10.1117/12.799148

KEYWORDS: Optical parametric oscillators, Crystals, Mid-IR, Mirrors, Fiber Bragg gratings, Reflectivity, Modulation, Output couplers, Directed infrared countermeasures, Nonlinear crystals

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Proceedings Article | 13 May 2008 Paper

High resolution ladar using time-correlated single-photon counting

Ove Steinvall, Lars Sjöqvist, Markus Henriksson, Per Jonsson

Proceedings Volume 6950, 695002 (2008) https://doi.org/10.1117/12.778323

KEYWORDS: Optical spheres, LIDAR, Receivers, Pulsed laser operation, Reflectivity, Picosecond phenomena, Detection theory, Sensors, Target detection, Beam shaping

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Proceedings Article | 23 October 2007 Paper

Time-of-flight range profiling using time-correlated single-photon counting

Lars Sjöqvist, Markus Henriksson, Per Jonsson, Ove Steinvall

Proceedings Volume 6738, 67380N (2007) https://doi.org/10.1117/12.737938

KEYWORDS: Profiling, Photons, Picosecond phenomena, Sensors, Turbulence, Distance measurement, Receivers, Signal to noise ratio, Data acquisition, Pulsed laser operation

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Proceedings Article | 11 October 2007 Paper

Tandem OPO systems for mid-infrared generation using quasi phase-matching and volume Bragg gratings

Markus Henriksson, Lars Sjöqvist, Mikael Tiihonen, Valdas Pasiskevicius, Fredrik Laurell

Proceedings Volume 6738, 673805 (2007) https://doi.org/10.1117/12.737229

KEYWORDS: Optical parametric oscillators, Crystals, Ferroelectric materials, Mid-IR, Fiber Bragg gratings, Mirrors, Fabry–Perot interferometers, Output couplers, Holmium, Gallium arsenide

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Proceedings Article | 5 October 2006 Paper

Experimental study of mid-IR laser beam wander close to a jet engine exhaust

Markus Henriksson, Lars Sjöqvist, Ove Gustafsson

Proceedings Volume 6397, 639709 (2006) https://doi.org/10.1117/12.689638

KEYWORDS: Scintillation, Laser beam propagation, Cameras, Turbulence, Laser countermeasures, Atmospheric propagation, Mid-IR, Refraction, Laser systems engineering, Laser applications

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Proceedings Article | 4 November 2005 Paper

Simulation of laser beam propagation over land and sea using phase screens: a comparison with experimental data

Lars Sjöqvist, Markus Henriksson, Ove Steinvall

Proceedings Volume 5989, 59890D (2005) https://doi.org/10.1117/12.630655

KEYWORDS: Turbulence, Atmospheric propagation, Laser countermeasures, Scintillation, Laser beam propagation, Laser systems engineering, Spatial frequencies, Atmospheric turbulence, Atmospheric modeling, Wave propagation

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Proceedings Article | 4 November 2005 Paper

Numerical simulation of a battlefield Nd:YAG laser

Markus Henriksson, Lars Sjoqvist, Thomas Uhrwing

Proceedings Volume 5989, 59890I (2005) https://doi.org/10.1117/12.630409

KEYWORDS: Electro optical modeling, Optical simulations, Nd:YAG lasers, Rod lasers, Thermal modeling, Prisms, Q switching, Data modeling, Phase shifts, Q switched lasers

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Proceedings Article | 29 December 2004 Paper

Laser beam propagation in close vicinity to a down-scaled jet engine exhaust

Lars Sjoqvist, Ove Gustafsson, Markus Henriksson

Proceedings Volume 5615, (2004) https://doi.org/10.1117/12.578291

KEYWORDS: Turbulence, Atmospheric propagation, Laser beam propagation, Beam propagation method, Cameras, Motion models, Infrared cameras, Imaging systems, Atmospheric turbulence, Wave propagation

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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 | 21 August 2003 Paper

Target recognition by vibration frequency analysis: a comparison of laser vibrometry and acoustic methods

Dietmar Letalick, Tomas Carlsson, Hans Habberstad, Makus Henriksson

Proceedings Volume 5086, (2003) https://doi.org/10.1117/12.488508

KEYWORDS: Acoustics, Sensors, Vibrometry, Target recognition, Laser systems engineering, Telescopes, Head, Roads, Optical amplifiers, Signal processing

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