Mr. Frank Wilsenack Profile

Frank Wilsenack

at BAAINBw

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Publications (8)

Proceedings Article | 7 June 2024 Presentation + Paper

Fast broadband QCL-based chemical detection: an optical alternative for road surface reconnaissance

Frank Wilsenack, Fabian Meyer, Yuri Flores, Marko Haertelt, Mario Adelhardt

Proceedings Volume 13056, 130560C (2024) https://doi.org/10.1117/12.3013650

KEYWORDS: Quantum cascade lasers, Contamination, Roads, Data acquisition, Chemical detection, Silicon, Reconnaissance, Optical surfaces, Spatial resolution

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Fastly detecting hazardous, non-volatile chemical substances on paved roads and streets is a topic of utmost military importance in an area denial scenario. Since the 1980s, inherently slow manual sampling has been avoided on armored vehicles using a small silicone wheel that continuously accumulates surface contaminations. After a given sampling period, collected (and potentially hazardous) contaminants on the wheel are thermally desorbed and analyzed by mass spectrometry. This approach led to further technological advancements, including implementing a double-wheel sampling system for automated, uninterrupted operation. Suspicious areas are examined at low driving speeds (approximating a fast-walking speed) with comparatively low spatial resolution, as the silicone wheels can only be rolled comparatively slowly to ensure continuous surface contact. Incremental improvements may further optimize the double-wheel sampling system. In that context, we are currently investigating laser desorption technology to achieve a more targeted heat treatment of the complete silicone wheel and increase spatial resolution and sensitivity. In addition, we also contribute to the development of advanced ion mobility spectrometers, which are both fast scanning and highly sensitive, as a viable alternative to cumbersome mass spectrometers. As a radically different approach, we report here on a measurement system using back-scattering IR-spectroscopy to optically interrogate samples at a standoff distance and process the information without delay. The used IR light source consists of three coupled broadband quantum cascade laser modules, each with an integrated micro-opto-electro-mechanical grating scanner (MOEMS EC-QCL). The elaborate coupling of three such pulsed laser modules provides an ultra-broadband spectral scan within the IR-fingerprint area (covered by those three MOEMS EC-QCLs) at a repetition rate of almost one kilohertz, thus resulting in measurement times of as short as one millisecond per (ultra-broadband) spectrum. We found that even minor contaminations of hazardous substances are identified using this setup. Furthermore, preliminary laboratory tests revealed a successful detection after the measurements on a fast-moving contaminated object. The experiments were performed at different observation angles with a considerable focal depth. The proof of concept shows that this novel QCL-based chemical detection approach is fast enough and promising to continuously monitor the ground with sufficient geometric resolution at cruise speeds on uneven and textured surfaces.

Proceedings Article | 7 June 2024 Presentation + Paper

Combining standoff tomography with point detection: a game changer for the identification of airborne toxic chemicals

Frank Wilsenack, Maria Allers, Fabian Meyer, Thomas Wolf, Torbjörn Tjärnhage, Lars Landström, Arne Ficks

Proceedings Volume 13056, 130560Z (2024) https://doi.org/10.1117/12.3013427

KEYWORDS: Sensors, Standoff detection, Clouds, Tomography, Aerosols, FT-IR spectroscopy, Sulfur, Spatial resolution, Atmospheric modeling, Imaging systems

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Proceedings Article | 14 June 2023 Presentation + Paper

Detection and 3D characterization of short-time chemical exposures with a dual setup of IR focal plane arrays

Frank Wilsenack, Thomas Wolf, Fabian Meyer, Arne Ficks

Proceedings Volume 12541, 1254102 (2023) https://doi.org/10.1117/12.2663155

KEYWORDS: Clouds, Aerosols, Tomography, Staring arrays, Liquids, Sensors, 3D modeling, Chemical analysis, Atmospheric modeling, Hyperspectral imaging, Standoff detection

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Proceedings Article | 17 May 2019 Paper

Dissemination monitoring by LWIR hyperspectral imaging

F. Wilsenack, T. Wolf, L. Landström, P. Wästerby, T. Tjärnhage

Proceedings Volume 11010, 1101007 (2019) https://doi.org/10.1117/12.2518834

KEYWORDS: Clouds, Long wavelength infrared, Sensors, Hyperspectral imaging, Detection and tracking algorithms, Standoff detection, Sensor networks, Staring arrays, Imaging systems, Absorption

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Proceedings Article | 14 May 2018 Paper

100 W-level peak power laser system tunable in the LWIR applied to detection of persistent chemical agents

F. Gutty, A. Grisard, C. Larat, D. Papillon, M. Schwarz, E. Lallier, H. Tholl, F. Münzhuber, J. Kunz, M. Raab, M. Rattunde, Stefan Hugger, Mariusz Kastek, Tadeusz Piatkowski, François Brygo, Cédric Awanzino, Frank Wilsenack

Proceedings Volume 10639, 106392E (2018) https://doi.org/10.1117/12.2304378

KEYWORDS: Standoff detection, Active remote sensing, Pulsed fiber lasers, Fiber amplifiers, Infrared radiation, Nonlinear crystals, Quantum cascade lasers, Optical amplifiers, Long wavelength infrared, Tunable lasers

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Proceedings Article | 30 April 2018 Paper

First results of a QCL-OPA based standoff system, for detecting hazardous substances in the IR-fingerprint domain

Frank Wilsenack, Arne Lorenzen, François Brygo, Cédric Awanzino, F. Gutty, A. Grisard, C. Larat, D. Papillon, M. Schwarz, E. Lallier, Hans Dieter Tholl, Franz Münzhuber, Jürgen Kunz, Michael Raab, Marcel Rattunde, Stefan Hugger, Mariusz Kastek, Tadeusz Piatkowski

Proceedings Volume 10629, 1062902 (2018) https://doi.org/10.1117/12.2314623

KEYWORDS: Absorption, Standoff detection, Reflection, Liquids, Control systems, Laser optics, Chemical weapons, Interfaces, Quantum cascade lasers, Defense and security

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Proceedings Article | 5 October 2017 Paper

Active multispectral reflection fingerprinting of persistent chemical agents

H. D. Tholl, F. Münzhuber, J. Kunz, M. Raab, M. Rattunde, S. Hugger, F. Gutty, A. Grisard, C. Larat, D. Papillon, M. Schwarz, E. Lallier, M. Kastek, T. Piatkowski, F. Brygo, C. Awanzino, F. Wilsenack, A. Lorenzen

Proceedings Volume 10434, 104340C (2017) https://doi.org/10.1117/12.2277937

KEYWORDS: Quantum cascade lasers, Infrared detectors, Standoff detection, Laser applications, Chemometrics, Infrared radiation, Infrared sensors, Sensors, 3D acquisition

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Proceedings Article | 17 September 2009 Paper

Mobile demonstrator for biological aerosol standoff detection

Steffen Frey, Holger Wille, Frank Wilsenack

Proceedings Volume 7484, 748407 (2009) https://doi.org/10.1117/12.830302

KEYWORDS: Aerosols, Luminescence, Atmospheric particles, LIDAR, Refractive index, Backscatter, Standoff detection, Signal detection, Raman spectroscopy, Fluorescence spectroscopy

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Showing 5 of 8 publications

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