Mr. Mark C. Helmlinger Profile

Mark C. Helmlinger

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Publications (6)

Proceedings Article | 20 October 2023 Poster + Paper

Ultra-compact imaging spectrometer for the lunar surface (UCIS-Moon): instrument alignment and laboratory optical performance

Holly Bender, Abigail Fraeman, Christopher Smith, Megan Gibson, Robert Green, David Thompson, Michael Eastwood, Quentin Vinckier, Mark Helmlinger, Byron Van Gorp, Ian Mckinley, Charles Sarture, Pantazis Mouroulis

Proceedings Volume 12688, 126880J (2023) https://doi.org/10.1117/12.2678070

KEYWORDS: Equipment, Spectroscopy, Spectral response, Telescopes, Optical alignment, Short wave infrared radiation, Infrared spectroscopy, Minerals

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Proceedings Article | 26 August 2010 Paper

Development of the second generation Hyperspectral Airborne Terrestrial Imager (HATI): HATI - 2500

S. Sandor-Leahy, S. Thordarson, B. Baldauf, M. Figueroa, M. Helmlinger, H. Miller, T. Reynolds, J. Shepanski

Proceedings Volume 7813, 78130A (2010) https://doi.org/10.1117/12.873006

KEYWORDS: Sensors, Imaging systems, Calibration, Spectroscopy, Short wave infrared radiation, Data acquisition, Hyperspectral imaging, Cameras, Long wavelength infrared, Spectral resolution

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Proceedings Article | 12 August 2009 Paper

The Hyperspectral Airborne Tactical Instrument (HATI): a low-cost compact airborne hyperspectral imager

S. Sandor-Leahy, S. Thordarson, B. Baldauf, M. Figueroa, M. Helmlinger, H. Miller, T. Reynolds, J. Shepanski

Proceedings Volume 7458, 74580D (2009) https://doi.org/10.1117/12.824748

KEYWORDS: Calibration, Spectroscopy, Sensors, Hyperspectral imaging, Imaging systems, LIDAR, Short wave infrared radiation, Cameras, Video, Long wavelength infrared

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Proceedings Article | 27 September 2007 Paper

LED Spectrometer (LSpec) autonomous vicarious calibration facility

Mark Helmlinger, Carol Bruegge, Ethan Lubka, Harry Gross

Proceedings Volume 6677, 66770V (2007) https://doi.org/10.1117/12.730955

KEYWORDS: Reflectivity, Light emitting diodes, Sensors, Calibration, Data acquisition, Spectroscopy, Aerosols, Atmospheric particles, Radiative transfer, Infrared sensors

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Proceedings Article | 30 December 2004 Paper

Refinements to MISR’s radiometric calibration and implications for establishing a climate-quality aerosol observing system

David Diner, Ralph Kahn, Carol Bruegge, John Martonchik, Wedad Abdou, Barbara Gaitley, Mark Helmlinger, Olga Kalashnikova, Wen-Hao Li

Proceedings Volume 5652, (2004) https://doi.org/10.1117/12.579041

KEYWORDS: Aerosols, Calibration, Cameras, Atmospheric modeling, MODIS, Clouds, Atmospheric particles, Climatology, Radiometry, Sensors

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A number of factors affect the accuracy of aerosol retrievals from satellite imaging radiometers, including algorithm assumptions, the quality of the associated cloud masks, the prescribed aerosol optical and microphysical models, and calibration uncertainties. In this paper, we highlight a concerted effort by the Terra Multi-angle Imaging SpectroRadiometer (MISR) team to evaluate the accuracy and stability of the instrument's radiometric calibration, with the twofold objective of (1) making improvements in the absolute and relative calibration where supported by multiple lines of evidence, and (2) evaluating the effect of those calibration refinements on aerosol retrievals. Aspects of the instrument's on-board calibrator design, including careful pre-flight handling of the Spectralon diffusers and the novel use of detector-based standards, have contributed to excellent long-term radiometric stability. In addition, multiple methodologies, including comparisons with other Terra sensors, in-flight and laboratory tests involving AirMISR (the airborne counterpart to MISR), lunar observations, camera-to-camera radiometric comparisons at specialized viewing geometries, and investigations using surface-based radiometer data over dark water sites have provided a detailed picture of radiometric performance at the low light levels typical of a large fraction of global aerosol observations. We examine the sensitivity of aerosol property retrievals to small band-to-band and camera-to-camera calibration adjustments, and demonstrate the importance of calibration in meeting climate-quality accuracy requirements. Because combining downward-looking (satellite-based) and upward-looking (surface-based) radiometers can constrain the optical properties of an aerosol column to a greater extent than possible from either vantage point by itself, achieving radiometric consistency, or “closure” between them is essential to establishing a long-term aerosol/climate observing system.

Proceedings Article | 8 July 1994 Paper

Inflight validation of the calibration of the Airborne Visible/Infrared Imaging Spectrometer in 1993

Robert Green, Mark Helmlinger, James Conel, Jeannette van den Bosch

Proceedings Volume 2231, (1994) https://doi.org/10.1117/12.179779

KEYWORDS: Calibration, Spectral calibration, Atmospheric optics, Spectroscopy, Target acquisition, Reflectivity, Signal to noise ratio, Sensors, Absorption, Radiative transfer

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