Dr. Klaas Wielinga Profile

Dr. Klaas Wielinga

Retired

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Publications (4)

Proceedings Article | 3 October 2011 Paper

Spectropolarimeter for planetary exploration (SPEX): performance measurements with a prototype

Gerard van Harten, Klaas Wielenga, Rik ter Horst, Erik Laan, Christoph Keller, Robert Voors, Martijn Smit, Sandro Hannemann, Daphne Stam, Willem Vliegenthart, Jeroen H. Rietjens, Scott Moon, Ramón Navarro, Frans Snik, Adrianus Verlaan

Proceedings Volume 8176, 81760D (2011) https://doi.org/10.1117/12.897706

KEYWORDS: Polarization, Prototyping, Modulation, Glasses, Sensors, Atmospheric particles, Earth's atmosphere, Electronics, Wave plates, Crystals

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Proceedings Article | 10 September 2011 Paper

Prototyping for the Spectropolarimeter for Planetary EXploration (SPEX): calibration and sky measurements

Renia Diamantopoulou, Klaas Wielinga, Erik Laan, Gerard van Harten, Rik ter Horst, Jeroen H. Rietjens, Otto Hasekamp, Frans Snik, Ramón Navarro, Ad Verlaan, Jozua de Boer, Robert Voors, Christoph Keller, Scott Moon, Daphne Stam, Sandro Hannemann, Willem Vliegenthart, J. Martijn Smit

Proceedings Volume 8160, 81600Z (2011) https://doi.org/10.1117/12.893741

KEYWORDS: Polarization, Aerosols, Prototyping, Modulation, Atmospheric particles, Polarimetry, Calibration, Wave plates, Scattering, Climatology

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We present the Spectropolarimeter for Planetary EXploration (SPEX), a high-accuracy linear spectropolarimeter measuring from 400 to 800 nm (with 2 nm intensity resolution), that is compact (~ 1 liter), robust and lightweight. This is achieved by employing the unconventional spectral polarization modulation technique, optimized for linear polarimetry. The polarization modulator consists of an achromatic quarter-wave retarder and a multiple-order retarder, followed by a polarizing beamsplitter, such that the incoming polarization state is encoded as a sinusoidal modulation in the intensity spectrum, where the amplitude scales with the degree of linear polarization, and the phase is determined by the angle of linear polarization. An optimized combination of birefringent crystals creates an athermal multiple-order retarder, with a uniform retardance across the field of view. Based on these specifications, SPEX is an ideal, passive remote sensing instrument for characterizing planetary atmospheres from an orbiting, air-borne or ground-based platform. By measuring the intensity and polarization spectra of sunlight that is scattered in the planetary atmosphere as a function of the single scattering angle, aerosol microphysical properties (size, shape, composition), vertical distribution and optical thickness can be derived. Such information is essential to fully understand the climate of a planet. A functional SPEX prototype has been developed and calibrated, showing excellent agreement with end-to-end performance simulations. Calibration tests show that the precision of the polarization measurements is at least 2 • 10^-4. We performed multi-angle spectropolarimetric measurements of the Earth's atmosphere from the ground in conjunction with one of AERONET's sun photometers. Several applications exist for SPEX throughout the solar system, a.o. in orbit around Mars, Jupiter and the Earth, and SPEX can also be part of a ground-based aerosol monitoring network.

Proceedings Article | 6 August 2010 Paper

SPEX: the spectropolarimeter for planetary exploration

Klaas Wielinga, J. Martijn Smit, Daphne Stam, Robert Voors, Jeroen H. H. Rietjens, Scott Moon, Christoph Keller, Rik ter Horst, Frans Snik, Gerard van Harten, Ad Verlaan, Erik Laan, Ramón Navarro

Proceedings Volume 7731, 77311B (2010) https://doi.org/10.1117/12.857941

KEYWORDS: Polarization, Atmospheric particles, Polarimetry, Aerosols, Modulation, Clouds, Atmospheric modeling, Planets, Mars, Scattering

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Proceedings Article | 21 October 2005 Paper

Demonstration of highly integrated payload architectures and instrumentation for future planetary missions

C. Erd, J. Harris, S. Kraft, A. Palacios, M. Collon, E. Kroesbergen, J. Montella, J. Moorhouse, K. Wielinga, P. Falkner, A. Peacock

Proceedings Volume 5978, 59780N (2005) https://doi.org/10.1117/12.631199

KEYWORDS: Sensors, Mirrors, Electronics, Cameras, Ultraviolet radiation, Optical filters, Spectroscopy, Linear filtering, Calibration, Photon counting

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