Dr. Jos Dingjan Profile

Dr. Jos Dingjan

at Dutch Space BV

SPIE Involvement:

Author

Publications (4)

Proceedings Article | 12 July 2019 Open Access

SPEXone: a compact multi-angle polarimeter

Aaldert van Amerongen, Jeroen Rietjens, Jochen Campo, Ersin Dogan, Jos Dingjan, Raj Nalla, Jerome Caron, Otto Hasekamp

Proceedings Volume 11180, 111800L (2019) https://doi.org/10.1117/12.2535940

KEYWORDS: Aerosols, Telescopes, Mirrors, Sensors, Spectroscopy, Polarization, Modulation, Ocean optics, Optics manufacturing, Polarimetry

Read Abstract +

We have developed a 6 dm³-sized optical instrument to characterize the microphysical properties of fine particulate matter or aerosol in the Earth atmosphere from low Earth orbit. Our instrument can provide detailed and worldwide knowledge of aerosol amount, type and properties. This is important for climate and ecosystem science and human health [1, 2]. Therefore, NASA, ESA and the European Commission study the application of aerosol instruments for planned or future missions. We distinguish molecular Rayleigh scattering from aerosol Mie-type scattering by analyzing multi-angle observations of radiance and the polarization state of sun light that is scattered in the Earth atmosphere [3]. We measure across the visible wavelength spectrum and in five distinct viewing angles between -50° and +50°. Such analysis has been traditionally done by rotating polarizers and band-filters in front of an Earth observing wide-angle imager. In contrast, we adopt a means to map the linear polarization state on the spectrum using passive optical components [4]. Thereby we can characterize the full linear polarization state for a scene instantaneously. This improves the polarimetric accuracy, which is critical for aerosol characterization, enabling us to distinguish for example anthropogenic from natural aerosol types. Moreover, the absence of moving parts simplifies the instrument, and makes it more robust and reliable. We have demonstrated this method in an airborne instrument called SPEX airborne [5, 6] in the recent ACEPOL campaign together with a suite of state-of-the art and innovative active and passive aerosol sensors on the NASA ER-2 high-altitude research platform [7]. An earlier report on the SPEX development roadmap was given in [8]. In this contribution we introduce SPEXone, a compact space instrument that has a new telescope that projects the five viewing angles onto a single polarization modulation unit and the subsequent reflective spectrometer. The novel telescope allows the observation of five scenes with one spectrometer, hence the name. We describe the optical layout of the telescope, polarization modulation optics, and spectrometer and discuss the manufacturability and tolerances involved. We will also discuss the modelled instrument performance and show preliminary results from optical breadboards of the telescope and polarization modulation optics. With SPEXone we present a strong and new tool for climate research and air quality monitoring. It can be used to study the effect of atmospheric aerosol on the heating/cooling of the Earth and on air quality. Also, SPEXone can improve the accuracy of satellite measurements of greenhouse gas concentrations and ocean color that rely on molecular absorption of reflected sunlight by providing detailed knowledge of the aerosol properties, required to accurately trace the light path in presence of scattering.
SPEXone is developed in a partnership between SRON Netherlands Institute for Space Research and Airbus Defence and Space Netherlands with support from the Netherlands Organisation for Applied Scientific Research (TNO) as a Dutch contribution to the NASA PACE observatory launching in 2022.

DOWNLOAD PAPER

Proceedings Article | 17 November 2017 Open Access

The Tropomi instrument: last steps towards final integration and testing

J. Doornink, J. de Vries, R. Voors, J. Dingjan, B. Ording, N. van der Valk, R. Vink, R. Hoogeveen, J. Grant, T. Canas, Q. Kleipool, P. Veefkind

Proceedings Volume 10563, 1056342 (2017) https://doi.org/10.1117/12.2304148

KEYWORDS: Sensors, Short wave infrared radiation, Spectroscopy, Space telescopes, Telescopes, Astronomical imaging, Calibration, Electronics, Near infrared, Space operations

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 25 September 2017 Open Access

Results of the Tropomi calibration campaign

B. Ording, A. Ludewig, R. Hoogeveen, D. ten Bloemendal, J. Dingjan, R. Voors, J. de Vries

Proceedings Volume 10562, 105623B (2017) https://doi.org/10.1117/12.2296118

KEYWORDS: Calibration, Sensors, Short wave infrared radiation, Lamps, Diffusers, Free electron lasers, Near infrared, Sun, Ultraviolet radiation, Astronomical imaging

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 12 August 2016 Paper

TROPOMI on ESA’s Sentinel 5p ready for launch and use

Johan de Vries, Robert Voors, Barend Ording, Jos Dingjan, Pepijn Veefkind, Antje Ludewig, Quintus Kleipool, Ruud Hoogeveen, Ilse Aben

Proceedings Volume 9688, 96880B (2016) https://doi.org/10.1117/12.2240839

KEYWORDS: Environmental sensing, Calibration, Short wave infrared radiation, Neodymium, Sensors, Ions, Sun, Spectroscopy, Satellites, Carbon monoxide

Read Abstract +

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years