Mr. Dirk P. Seiffer Profile

Dirk P. Seiffer

at Fraunhofer IOSB

SPIE Involvement:

Author

Publications (23)

Proceedings Article | 19 October 2023 Presentation + Paper

An electrooptical propagation and signature experiment in a humid environment

Christian Eisele, Dirk Seiffer, Erik Sucher, Carmen Ullwer, Peter Großmann, Berndt Bartos

Proceedings Volume 12731, 1273104 (2023) https://doi.org/10.1117/12.2675880

KEYWORDS: Simulations, Sensors, Turbulence, Electro optics, Electro optical modeling, Atmospheric propagation, Thermal modeling

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Proceedings Article | 9 October 2019 Paper

Near-surface turbulence effects on electro-optical propagation in an arid environment

Christian Eisele, Dirk Seiffer, Erik Sucher, Carmen Ullwer, Thomas Kociok, Detlev Sprung, Sven van Binsbergen, Piet Bijl

Proceedings Volume 11153, 1115302 (2019) https://doi.org/10.1117/12.2531009

KEYWORDS: Turbulence, Electro optics, Atmospheric propagation, Algorithm development, Modulation transfer functions, Atmospheric sensing, Optical sensors, Detector development, Detection and tracking algorithms, Electro optical systems

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Proceedings Article | 10 October 2018 Paper

Height dependence of characteristics of power spectra of temperature investigated in the surface layer of White Sands, US

Detlev Sprung, Erik Sucher, Alexander M. van Eijk, Christian Eisele, Dirk Seiffer, Karin Stein

Proceedings Volume 10787, 1078705 (2018) https://doi.org/10.1117/12.2325617

KEYWORDS: Turbulence, Ultrasonics, Optical turbulence, Temperature metrology, Wave propagation, Vegetation, Atmospheric propagation, Refractive index, Cameras, Data modeling

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Proceedings Article | 10 October 2018 Paper

Optical turbulence in the coastal area over False Bay, South Africa: comparison of measurements and modeling results

Detlev Sprung, Alexander M. van Eijk, Carmen Ullwer, Willi Gunter, Christian Eisele, Dirk Seiffer, Erik Sucher, Karin Stein

Proceedings Volume 10787, 1078703 (2018) https://doi.org/10.1117/12.2325609

KEYWORDS: Optical turbulence, Turbulence, Heat flux, Meteorology, Atmospheric propagation, Ultrasonics, Atmospheric modeling, Wave propagation, Atmospheric optics, Humidity

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Proceedings Article | 10 October 2017 Paper

Comparison of integrated optical turbulence over the sea in different coastal regions in the world

Detlev Sprung, Erik Sucher, Christian Eisele, Dirk Seiffer, Alexander M. van Eijk, Karin Stein

Proceedings Volume 10425, 1042502 (2017) https://doi.org/10.1117/12.2279425

KEYWORDS: Optical turbulence, Climatology, Integrated optics, Electro optics, Electro optical systems, Laser systems engineering, Atmospheric optics, Turbulence, High speed cameras, Halogens

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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 | 7 September 2017 Paper

Investigation of the height dependency of optical turbulence in the surface layer over False Bay (South Africa)

Detlev Sprung, Alexander M. van Eijk, Willie Günter, Derek Griffith, Christian Eisele, Erik Sucher, Dirk Seiffer, Karin Stein

Proceedings Volume 10408, 104080U (2017) https://doi.org/10.1117/12.2275859

KEYWORDS: Optical turbulence, Atmospheric propagation, Atmospheric turbulence, Electro optics, Scintillation, Laser systems engineering, Optical testing, Meteorology, Turbulence

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Proceedings Article | 21 October 2016 Paper

Electro-optical muzzle flash detection

Jürgen Krieg, Christian Eisele, Dirk Seiffer

Proceedings Volume 9987, 99870A (2016) https://doi.org/10.1117/12.2240777

KEYWORDS: Sensors, Electro optics, Short wave infrared radiation, Acoustics, Infrared detectors, Firearms, Mid-IR, Near infrared, Infrared radiation, Signal detection

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Proceedings Article | 19 October 2016 Paper

FESTER: a propagation experiment, overview and first results

Christian Eisele, Dirk Peter Seiffer, Karin Stein, Erik Sucher, Willem Gunter, Faith February, George Vrahimis, Carl Wainman, Benita Maritz, Mokete Koago, Alexander M. van Eijk, Miranda van Iersel, Leo Cohen, Sven van Binsbergen, H. J. M. (Eric) Heemskerk, Armin Sternberg, Helmut Schulte, Arthur van Rheenen, Erik Brenthagen, Jan Thomassen, Derek Griffith

Proceedings Volume 10002, 1000208 (2016) https://doi.org/10.1117/12.2240771

KEYWORDS: Atmospheric propagation, Aerosols, Atmospheric particles, Sensors, Mid-IR, Long wavelength infrared, Environmental sensing, Turbulence, Halogens, Temperature metrology

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Proceedings Article | 19 October 2016 Presentation + Paper

First results on the Experiment FESTER on optical turbulence over False Bay South Africa: dependencies and consequences

Detlev Sprung, Alexander M. van Eijk, Erik Sucher, Christian Eisele, Dirk Seiffer, Karin Stein

Proceedings Volume 10002, 1000209 (2016) https://doi.org/10.1117/12.2240651

KEYWORDS: Optical turbulence, Atmospheric propagation, Electro optical systems, Turbulence, Heat flux, Ultrasonics, Kinematics, Refractive index, Temperature metrology, Receivers

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Proceedings Article | 19 October 2016 Paper

Static and dynamic thermal infrared signatures measured during the FESTER experiment: first results

W. Gunter, F. February, D. Seiffer, C. Eisele

Proceedings Volume 10002, 100020C (2016) https://doi.org/10.1117/12.2244530

KEYWORDS: Infrared signatures, Temperature metrology, Infrared radiation, Sensors, Metals, Thermography, Environmental sensing, Mid-IR, Infrared sensors, Clouds

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Proceedings Article | 19 September 2016 Presentation + Paper

The dependence of optical turbulence on thermal and mechanical forces over the sea

Alexander M. J. van Eijk, Detlev Sprung, Erik Sucher, Christian Eisele, Dirk Seiffer, Karin Stein

Proceedings Volume 9979, 99790R (2016) https://doi.org/10.1117/12.2239324

KEYWORDS: Optical turbulence, Turbulence, Refractive index, Heat flux, Humidity, Statistical analysis, Kinematics, Receivers, Meteorology, Wind measurement

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Proceedings Article | 19 September 2016 Presentation + Paper

The FESTER field trial

Alexander M. van Eijk, Willie Gunter, Faith February, Benita Maritz, George Vrahimis, Mokete Koago, Carl Wainman, Christian Eisele, Dirk Seiffer, Erik Sucher, Karin Stein, Miranda van Iersel, Leo Cohen, Sven Van Binsbergen, H. J. M. (Eric) Heemskerk, A. Sternberg, H. Schulte, Arthur van Rheenen, Erik Brenthagen, Jan Thomassen, D. Griffith

Proceedings Volume 9979, 99790Q (2016) https://doi.org/10.1117/12.2240642

KEYWORDS: Electro optics, Environmental sensing, Long wavelength infrared, Turbulence, Sensors, Mid-IR, Atmospheric propagation, Aerosols, Temperature metrology, Metals

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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 | 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 | 3 October 2014 Paper

Atmospheric limitations on the performance of electro-optical systems: a brief overview

Karin Stein, Szymon Gladysz, Dirk Seiffer, Andreas Zepp

Proceedings Volume 9224, 92240U (2014) https://doi.org/10.1117/12.2064631

KEYWORDS: Turbulence, Adaptive optics, Sensors, Scintillation, Wavefronts, Electro optical systems, Wavefront sensors, Cameras, Atmospheric propagation, Laser communications

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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 | 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 | 29 October 2007 Paper

The SAPPHIRE trial: investigations on angular deviation caused by refraction

Karin Stein, Dirk Seiffer

Proceedings Volume 6747, 674705 (2007) https://doi.org/10.1117/12.753812

KEYWORDS: Temperature metrology, Sapphire, Atmospheric propagation, Meteorology, Water, Refraction, Sensors, Coastal modeling, Cameras, Radio propagation

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Proceedings Article | 28 September 2006 Paper

Prediction of optical path deviations under stable conditions in maritime environments

Denis Dion, Dirk Seiffer, Karin Stein, Luc Forand

Proceedings Volume 6364, 636403 (2006) https://doi.org/10.1117/12.689163

KEYWORDS: Atmospheric modeling, Temperature metrology, Atmospheric optics, Humidity, Refraction, Water, Meteorology, Thermography, Geometrical optics, Sensors

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Proceedings Article | 14 October 2005 Paper

Variations of apparent target position due to refraction

Dirk Seiffer, Karin Stein

Proceedings Volume 5981, 598108 (2005) https://doi.org/10.1117/12.629574

KEYWORDS: Refraction, Cameras, Atmospheric propagation, Turbulence, Atmospheric modeling, Temperature metrology, Water, Electro optical modeling, Humidity, Environmental sensing

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Proceedings Article | 14 October 2005 Paper

Raypath deviation under stable and unstable conditions

Denis Dion, Dirk Seiffer, Karin Stein, Luc Forand, Guy Potvin

Proceedings Volume 5981, 598109 (2005) https://doi.org/10.1117/12.637615

KEYWORDS: Refraction, Atmospheric modeling, Meteorology, Temperature metrology, Beam propagation method, Water, Environmental sensing, Humidity, Scintillation, Thermography

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Proceedings Article | 20 March 2003 Paper

IR propagation through the marine boundary layer: comparison of model and experimental data

Karin Stein, Ernst Polnau, Dirk Seiffer

Proceedings Volume 4884, (2003) https://doi.org/10.1117/12.462640

KEYWORDS: Black bodies, Atmospheric propagation, Ocean optics, Sensors, Long wavelength infrared, Data modeling, Atmospheric modeling, Signal to noise ratio, Refraction, Meteorology

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