Dr. Ad L. Verlaan Profile

Dr. Ad L. Verlaan

Systems Engineer at TNO

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Publications (16)

Proceedings Article | 5 September 2019 Open Access

Interferometric system for Pm‐level stability characterization

A. Verlaan, J. Ellis, D. Voigt

Proceedings Volume 10565, 1056569 (2019) https://doi.org/10.1117/12.2552558

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Proceedings Article | 13 April 2018 Paper

High-precision optical metrology for Darwin: design and performance

Bertrand Calvel, Isabel Cabeza, Alexandre Cabral, Eberhard Manske, José Rebordão, Rainer Sesselmann, Zoran Sodnik, Ad Verlaan

Proceedings Volume 10568, 105682N (2018) https://doi.org/10.1117/12.2500126

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Proceedings Article | 21 November 2017 Open Access

High accuracy absolute distance metrology

Bas Swinkels, Nandini Bhattacharya, Ad Verlaan, Joseph J. Braat

Proceedings Volume 10567, 105670Z (2017) https://doi.org/10.1117/12.2308057

KEYWORDS: Distance measurement, Phase measurement, Interferometers, Interferometry, Calibration, Digital signal processing, Metrology, Space telescopes, Control systems, Tunable lasers

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Proceedings Article | 20 November 2017 Open Access

Spectropolarimetry for earth observations: a novel method for characterization of aerosols and clouds

Oana Van der Togt, Ad Verlaan, Kees Moddemeijer, Martijn Smit, Jeroen Rietjens, Otto Hasekamp, Daphne Stam, Frans Snik, Gerard van Harten

Proceedings Volume 10564, 105641S (2017) https://doi.org/10.1117/12.2309041

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Proceedings Article | 20 November 2017 Open Access

SPEX: the Spectropolarimeter for Planetary Exploration

J. H. Rietjens, F. Snik, D. Stam, J. Smit, G. van Harten, C. Keller, A. Verlaan, E. Laan, R. ter Horst, R. Navarro, K. Wielinga, S. Moon, R. Voors

Proceedings Volume 10565, 105651C (2017) https://doi.org/10.1117/12.2309231

KEYWORDS: Polarization, Atmospheric particles, Modulation, Jupiter, Wave plates, Polarimetry, Earth's atmosphere, Space operations, Clouds, Phase shift keying

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Proceedings Article | 20 November 2017 Open Access

LISA telescope assembly optical stability characterization for ESA

A. Verlaan, H. Hogenhuis, J. Pijnenburg, M. Lemmen, S. Lucarelli, D. Scheulen, David Ende

Proceedings Volume 10564, 105640K (2017) https://doi.org/10.1117/12.2309058

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Proceedings Article | 20 November 2017 Open Access

The Breadboard model of the LISA telescope assembly

S. Lucarelli, D. Scheulen, D. Kemper, R. Sippel, A. Verlaan, H. Hogenhuis, D. Ende

Proceedings Volume 10564, 105640J (2017) https://doi.org/10.1117/12.2309050

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Proceedings Article | 17 November 2017 Open Access

Lisa telescope assembly optical stability characterization for ESA

A. Verlaan, S. Lucarelli

Proceedings Volume 10563, 105634C (2017) https://doi.org/10.1117/12.2304092

KEYWORDS: Space telescopes, Telescopes, Mirrors, Interferometers, Nanoimprint lithography, Astronomical imaging, Metrology, Neodymium, Finite element methods, Optical instrument design

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Proceedings Article | 25 September 2017 Open Access

Higs-instrument: design and demonstration of a high performance gas concentration imager

A. Verlaan, W. Klop, H. Visser, H. van Brug, J. Human

Proceedings Volume 10562, 105625Z (2017) https://doi.org/10.1117/12.2296246

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Proceedings Article | 29 July 2016 Paper

Dimensional stability testing in thermal vacuum of the CHEOPS optical telescope assembly

W. Klop, A. Verlaan

Proceedings Volume 9904, 990437 (2016) https://doi.org/10.1117/12.2232899

KEYWORDS: Mirrors, Metrology, Telescopes, Optical telescopes, Optical fabrication, Space telescopes, Interferometers, Temperature metrology, Sensors, Optical instrument design

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Proceedings Article | 27 September 2013 Paper

A novel design for a spectropolarimeter: SPEX

A. Verlaan, H. van Brug, H. Visser

Proceedings Volume 8873, 88730K (2013) https://doi.org/10.1117/12.2024083

KEYWORDS: Polarization, Sensors, Prisms, Wave plates, Spectroscopy, Aerosols, Clouds, Polarimetry, Space telescopes, Computer programming

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Proceedings Article | 13 September 2012 Paper

LISA telescope assembly optical stability characterization for ESA

Adrianus Verlaan, Harmen Hogenhuis, Joep Pijnenburg, Martin Lemmen, Stefano Lucarelli, Dietmar Scheulen, David Ende

Proceedings Volume 8450, 845003 (2012) https://doi.org/10.1117/12.925112

KEYWORDS: Telescopes, Mirrors, Space telescopes, Nanoimprint lithography, Interferometers, Metrology, Optical instrument design, Sensors, Optical fabrication, Distortion

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Proceedings Article | 3 October 2011 Paper

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

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

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

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

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

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

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 | 30 September 2004 Paper

TNO TPD contributions to high-precision optical metrology: a Darwin metrology breadboard for ESA

Adrianus Verlaan, Teun van den Dool, Ben Braam, Bertrand Calvel, Rainer Sesselman, Wolfgang Poeschel, Denys Dontsov, Isabel Cabeza Vega, Eberhard Manske, Thilo Schuldt, Zoran Sodnik

Proceedings Volume 5528, (2004) https://doi.org/10.1117/12.559915

KEYWORDS: Sensors, Interferometers, Metrology, Mirrors, Satellites, Telescopic pixel displays, Telescopes, Beam expanders, Optical metrology, Space telescopes

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Showing 5 of 16 publications

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