Dr. Rienk T. Jongma Profile

Dr. Rienk T. Jongma

Sr Instrument Scientist at SRON Nationaal Instituut voor Ruimteonderzoek

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Publications (6)

Proceedings Article | 26 October 2007 Paper

Breadboarding activities of the TROPOMI-SWIR module

Ruud Hoogeveen, Rienk Jongma, Paul Tol, Annemieke Gloudemans, Ilse Aben, Johan de Vries, Huib Visser, Erik Boslooper, Marcel Dobber, Pieternel Levelt

Proceedings Volume 6744, 67441T (2007) https://doi.org/10.1117/12.737892

KEYWORDS: Short wave infrared radiation, Carbon monoxide, Sensors, Methane, Silicon, Diffraction gratings, Spectroscopy, Aerosols, Atmospheric modeling, Calibration

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The TROPOMI instrument concept is part of the TRAQ mission proposal to ESA in response to the Call for Ideas in 2005. TRAQ (TRopospheric composition and Air Quality) has been accepted for a further pre-phase A study for the next Earth Explorer core Mission. A very similar instrument has been proposed for the CAMEO platform to the US National Research Council decadal study, which has also been accepted for further study. TROPOMI is a nadir-viewing grating-based imaging spectrometer using the Dutch OMI and SCIAMACHY heritage. It includes an UV-VIS-NIR module that consists of three UV-VIS channels continuously covering the 270-490 nm range to determine O₃, NO₂, HCHO, SO₂, aerosols and a NIR-channel covering 710-775 nm for cloud detection and information on the aerosol height distribution using the oxygen A band. TROPOMI also includes a SWIR module covering 2305-2385 nm that mainly focuses on determination of CO and CH₄ total columns. All species are measured with sensitivity down to the Earth's surface, thus addressing issues of anthropogenic emissions and their impact on air quality and climate. In the TRAQ mission, unique diurnal time sampling with up to 5 daytime observations over midlatitude regions (Europe, North-America, China) is foreseen by using a non-sun-synchronous, medium-inclination drifting orbit and a 2600 km wide observational swath. Several more general aspects related to the TROPOMI instrument are discussed in a separate paper in this conference. This paper focuses on the development of the SWIR module. A breadboard model (BBM) has been designed and constructed which is as much as possible functionally flight representative. Critical technologies to be demonstrated with the BBM are the SWIR HgCdTe-based 2D focal plane array, the on-board SWIR calibration LED, and in particular, the SRON/TNO developed silicon-based immersed grating that allows a hugely reduced instrument volume. In the presentation the results of a performance analysis of the TROPOMI-SWIR channel will be discussed, as well as results of the detector characterization program on a representative off-the-shelf FPA, and details of the photolithographic production of the immersed grating.

Proceedings Article | 17 October 2007 Paper

TROPOMI: solar backscatter satellite instrument for air quality and climate

Johan de Vries, Erik Laan, Ruud Hoogeveen, Rienk Jongma, Ilse Aben, Huib Visser, Erik Boslooper, Heikki Saari, Marcel Dobber, Pepijn Veefkind, Quintus Kleipool, Pieternel Levelt

Proceedings Volume 6744, 674409 (2007) https://doi.org/10.1117/12.737755

KEYWORDS: Signal to noise ratio, Sensors, Short wave infrared radiation, Sun, CMOS sensors, Telescopes, CCD image sensors, Charge-coupled devices, Satellites, Calibration

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Proceedings Article | 7 September 2006 Paper

TROPOMI and TROPI: UV/VIS/NIR/SWIR instruments

P. Levelt, G. H. van den Oord, M. Dobber, H. Eskes, M. van Weele, P. Veefkind, R. van Oss, I. Aben, R. Jongma, J. Landgraf, J. de Vries, H. Visser

Proceedings Volume 6296, 629619 (2006) https://doi.org/10.1117/12.680582

KEYWORDS: Short wave infrared radiation, Aerosols, Calibration, Ozone, Diffusers, Carbon monoxide, Near infrared, Sensors, Spectroscopy, Signal to noise ratio

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TROPOMI (Tropospheric Ozone-Monitoring Instrument) is a five-channel UV-VIS-NIR-SWIR non-scanning nadir viewing imaging spectrometer that combines a wide swath (114°) with high spatial resolution (10 × 10 km² ). The instrument heritage consists of GOME on ERS-2, SCIAMACHY on Envisat and, especially, OMI on EOS-Aura. TROPOMI has even smaller ground pixels than OMI-Aura but still exceeds OMI's signal-to-noise performance. These improvements optimize the possibility to retrieve tropospheric trace gases. In addition, the SWIR capabilities of TROPOMI are far better than SCIAMACHY's both in terms of spatial resolution and signal to noise performance. TROPOMI is part of the TRAQ payload, a mission proposed in response to ESA's EOEP call. The TRAQ mission will fly in a non-sun synchronous drifting orbit at about 720 km altitude providing nearly global coverage. TROPOMI measures in the UV-visible wavelength region (270-490 nm), in a near-infrared channel (NIR) in the 710-775 nm range and has a shortwave infrared channel (SWIR) near 2.3 μm. The wide swath angle, in combination with the drifting orbit, allows measuring a location up to 5 times a day at 1.5-hour intervals. The spectral resolution is about 0.45 nm for UVVIS- NIR and 0.25 nm for SWIR. Radiometric calibration will be maintained via solar irradiance measurements using various diffusers. The instrument will carry on-board calibration sources like LEDs and a white light source. Innovative aspects include the use of improved detectors in order to improve the radiation hardness and the spatial sampling capabilities. Column densities of trace gases (NO₂, O₃, SO₂ and HCHO) will be derived using primarily the Differential Optical Absorption Spectroscopy (DOAS) method. The NIR channel serves to obtain information on clouds and the aerosol height distribution that is needed for tropospheric retrievals. A trade-off study will be conducted whether the SWIR channel, included to determine column densities of CO and CH₄, will be incorporated in TROPOMI or in the Fourier Transform Spectrometer SIFTI on TRAQ. The TROPI instrument is similar to the complete TROPOMI instrument (UV-VIS-NIR-SWIR) and is proposed for the CAMEO initiative, as described for the U.S. NRC Decadal Study on Earth Science and Applications from Space. CAMEO also uses a non-synchronous drifting orbit, but at a higher altitude (around 1500 km). The TROPI instrument design is a modification of the TROPOMI design to achieve identical coverage and ground pixel sizes from a higher altitude. In this paper capabilities of TROPOMI and TROPI are discussed with emphasis on the UV-VIS-NIR channels as the TROPOMI SWIR channel is described in a separate contribution [5].

Proceedings Article | 1 September 2006 Paper

Sensitivity analysis of a new SWIR-channel measuring tropospheric CH4 and CO from space

Rienk Jongma, Annemieke M. Gloudemans, Ruud W. Hoogeveen, Ilse Aben, Johan de Vries, Isabel Escudero-Sanz, Gijsbertus van den Oord, Pieternel Levelt

Proceedings Volume 6302, 630214 (2006) https://doi.org/10.1117/12.680277

KEYWORDS: Short wave infrared radiation, Calibration, Sensors, Aerosols, Spectral resolution, Interference (communication), Atmospheric modeling, Absorption, Signal to noise ratio, Diffraction gratings

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Proceedings Article | 21 October 2005 Paper

Spectrograph dedicated to measuring tropospheric trace gas constituents from space

Johan de Vries, Erik Laan, Alex Deutz, Isabel Escudero-Sanz, Henk Bokhove, Jan Hoegee, Ilse Aben, Rienk Jongma, Jochen Landgraf, Otto Hasekamp, Sander Houweling, Michiel van Weele, Roeland van Oss, Gijsbertus van den Oord, Pieternel Levelt

Proceedings Volume 5978, 59780O (2005) https://doi.org/10.1117/12.627008

KEYWORDS: Aerosols, Clouds, Sensors, Short wave infrared radiation, Satellites, Carbon monoxide, Climatology, Ozone, Aerospace engineering, Gases

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Proceedings Article | 20 September 1995 Paper

Trace gas detection via cavity ring down spectroscopy

Richard Engeln, Rienk Jongma, Maarten Boogaarts, Iwan Holleman, Gerard Meijer

Proceedings Volume 2506, (1995) https://doi.org/10.1117/12.221077

KEYWORDS: Absorption, Spectroscopy, Fourier transforms, Mirrors, Mercury, Light sources, Reflectivity, Absorption spectroscopy, Molecular spectroscopy, Molecules

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Showing 5 of 6 publications

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