Dr. Harry H. Schlemmer Profile

Dr. Harry H. Schlemmer

Principal Scientist at HENSOLDT Optronics GmbH

SPIE Involvement:

Author

Proceedings Article | 30 September 2022 Presentation + Paper

Multispectral imaging in the SWIR: theory, practical approach, and expected performance

M. Gerken, H. Schlemmer

Proceedings Volume 12234, 122340D (2022) https://doi.org/10.1117/12.2639592

KEYWORDS: Short wave infrared radiation, Cameras, Optical filters, Visible radiation, Colorimetry, Multispectral imaging, Visualization, Vegetation, Reflectivity, RGB color model

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Proceedings Article | 27 May 2022 Paper

Contrast enhancement of SWIR images based on four filter discrimination and principle components analysis

Martin Gerken, Harry Schlemmer

Proceedings Volume 12107, 121071J (2022) https://doi.org/10.1117/12.2620649

KEYWORDS: Short wave infrared radiation, Cameras, Optical filters, Visualization, Sensors, Multispectral imaging, Colorimetry, RGB color model, Image filtering, Camouflage

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Proceedings Article | 7 May 2019 Presentation + Paper

Color discrimination of a short wave colorimeter

M. Gerken, H. Schlemmer, T. Becker

Proceedings Volume 11002, 1100210 (2019) https://doi.org/10.1117/12.2519718

KEYWORDS: Short wave infrared radiation, Cameras, RGB color model, Camouflage, Optical filters, Visualization, Principal component analysis, Colorimetry, Image filtering, Vegetation

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Proceedings Article | 9 May 2018 Presentation + Paper

Colorimetry and multispectral imaging in the shortwave infrared

M. Gerken, H. Schlemmer, C. Siemens

Proceedings Volume 10624, 1062409 (2018) https://doi.org/10.1117/12.2305298

KEYWORDS: Short wave infrared radiation, Optical filters, Reflectivity, Cameras, Colorimetry, Sensors, Image filtering, Visible radiation, Multispectral imaging, Shortwaves

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Proceedings Article | 3 May 2016 Paper

Unified characterization of imaging sensors from VIS through LWIR

M. Gerken, H. Schlemmer, M. Münzberg

Proceedings Volume 9820, 98200G (2016) https://doi.org/10.1117/12.2224182

KEYWORDS: Short wave infrared radiation, Sensors, Near infrared, Cameras, Minimum resolvable temperature difference, Long wavelength infrared, Atmospheric sensing, Optical sensors, Mid-IR, Ions

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Proceedings Article | 29 May 2014 Paper

Characterization of SWIR cameras by MRC measurements

M. Gerken, H. Schlemmer, Hubertus Haan, Christofer Siemens, M. Münzberg

Proceedings Volume 9071, 907110 (2014) https://doi.org/10.1117/12.2052928

KEYWORDS: Short wave infrared radiation, Cameras, Sensors, Light sources, Imaging systems, Visible radiation, Visualization, Calibration, Lamps, Manufacturing

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Cameras for the SWIR wavelength range are becoming more and more important because of the better observation range for day-light operation under adverse weather conditions (haze, fog, rain). In order to choose the best suitable SWIR camera or to qualify a camera for a given application, characterization of the camera by means of the Minimum Resolvable Contrast MRC concept is favorable as the MRC comprises all relevant properties of the instrument. With the MRC known for a given camera device the achievable observation range can be calculated for every combination of target size, illumination level or weather conditions. MRC measurements in the SWIR wavelength band can be performed widely along the guidelines of the MRC measurements of a visual camera. Typically measurements are performed with a set of resolution targets (e.g. USAF 1951 target) manufactured with different contrast values from 50% down to less than 1%. For a given illumination level the achievable spatial resolution is then measured for each target. The resulting curve is showing the minimum contrast that is necessary to resolve the structure of a target as a function of spatial frequency. To perform MRC measurements for SWIR cameras at first the irradiation parameters have to be given in radiometric instead of photometric units which are limited in their use to the visible range. In order to do so, SWIR illumination levels for typical daylight and twilight conditions have to be defined. At second, a radiation source is necessary with appropriate emission in the SWIR range (e.g. incandescent lamp) and the irradiance has to be measured in W/m² instead of Lux = Lumen/m². At third, the contrast values of the targets have to be calibrated newly for the SWIR range because they typically differ from the values determined for the visual range. Measured MRC values of three cameras are compared to the specified performance data of the devices and the results of a multi-band in-house designed Vis-SWIR camera system are discussed.

Proceedings Article | 18 June 2013 Paper

Thermal imagers: from ancient analog video output to state-of-the-art video streaming

Hubertus Haan, Timo Feuchter, Mario Münzberg, Jörg Fritze, Harry Schlemmer

Proceedings Volume 8704, 87042T (2013) https://doi.org/10.1117/12.2015705

KEYWORDS: Video, Thermography, Video compression, Cameras, Analog electronics, Mirrors, Sensors, Image quality standards, Control systems, Computer programming

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Proceedings Article | 11 June 2013 Paper

A modular packaging approach for upgrading tanks with staring thermal imagers

Mario Münzberg, Bertram Achtner, Jörg Fritze, Ottmar Rothaupt, Harry Schlemmer, Markus Welk, Dirk Weisser

Proceedings Volume 8704, 87040H (2013) https://doi.org/10.1117/12.2015702

KEYWORDS: Thermography, Mirrors, Channel projecting optics, Long wavelength infrared, Staring arrays, Prisms, Sensors, Organic light emitting diodes, Mid-IR, Zoom lenses

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Proceedings Article | 4 May 2010 Paper

Innovative optronics for the new PUMA tank

J. Fritze, M. Münzberg, H. Schlemmer

Proceedings Volume 7660, 76600A (2010) https://doi.org/10.1117/12.849872

KEYWORDS: Thermography, Channel projecting optics, Cameras, Sensors, Optoelectronics, Laser range finders, Staring arrays, Video, Image resolution, Mirrors

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Proceedings Article | 7 May 2009 Paper

Stationary early warning system for bird strike prevention in aviation

Holger Vogel, Mario Muenzberg, Harry Schlemmer, Hubertus Haan, Paul Baader, Klaus Herden, Basel Fardi, Jan Schlosshauer

Proceedings Volume 7298, 72983R (2009) https://doi.org/10.1117/12.818712

KEYWORDS: Thermography, Imaging systems, Information security, Time metrology, Cameras, Distance measurement, Velocity measurements, Calibration, Detection and tracking algorithms, Image resolution

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Proceedings Article | 16 April 2008 Paper

Near-field observation platform

Harry Schlemmer, Constantin Baeurle, Holger Vogel

Proceedings Volume 6940, 69401G (2008) https://doi.org/10.1117/12.780507

KEYWORDS: Near field, Cameras, Thermography, Sensors, Electronics, Panoramic photography, Video, Detection and tracking algorithms, Interfaces, Thermal imaging cameras

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Proceedings Article | 19 May 2006 Paper

Biological aerosol warner and analyser

Harry Schlemmer, Gunther Kürbitz, Peter Miethe, Michael Spieweck

Proceedings Volume 6218, 62180E (2006) https://doi.org/10.1117/12.664886

KEYWORDS: Biological research, Aerosols, Atmospheric particles, Sensors, Control systems, Liquids, Chemical analysis, Statistical analysis, Time metrology, Fourier transforms

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Proceedings Article | 15 October 2005 Paper

Dual-band infrared camera

H. Vogel, H. Schlemmer

Proceedings Volume 5964, 59640S (2005) https://doi.org/10.1117/12.625180

KEYWORDS: Short wave infrared radiation, Long wavelength infrared, Image fusion, Cameras, Thermography, Infrared imaging, Visibility, Fiber optic gyroscopes, Sensors, Roads

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Showing 5 of 13 publications

Conference Committee Involvement (8)

Advanced Optics for Imaging Applications: UV through LWIR VIII

1 May 2023 | Orlando, Florida, United States

Advanced Optics for Imaging Applications: UV through LWIR VII

3 April 2022 | Orlando, Florida, United States

Advanced Optics for Imaging Applications: UV through LWIR VI

12 April 2021 | Online Only, Florida, United States

Advanced Optics for Imaging Applications: UV through LWIR V

27 April 2020 | Online Only, California, United States

Advanced Optics for Imaging Applications: UV through LWIR IV

14 April 2019 | Baltimore, MD, United States

Showing 5 of 8 Conference Committees

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