A5037526939- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Superconducting and THz Device Technology
- Calibration and Measurement Techniques
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Physics of Superconductivity and Magnetism
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Subatomic Physics Research
- Climate variability and models
- Infrared Target Detection Methodologies
- Advanced Semiconductor Detectors and Materials
- Optical Coatings and Gratings
- Astronomical Observations and Instrumentation
- Photonic and Optical Devices
- Quantum, superfluid, helium dynamics
- Planetary Science and Exploration
- Particle Detector Development and Performance
- Precipitation Measurement and Analysis
- Spacecraft and Cryogenic Technologies
- Spacecraft Design and Technology
- CCD and CMOS Imaging Sensors
- Atmospheric aerosols and clouds
- Terahertz technology and applications
- Gyrotron and Vacuum Electronics Research
SRON Netherlands Institute for Space Research
2013-2023
VTT Technical Research Centre of Finland
2021
Tieto (Finland)
2021
Delft University of Technology
2021
Nederlands Instituut Voor Zuivel Oonderzoek
2007-2011
University of Bern
2005
Leiden University
1987-1992
Huygens Institute for History and Culture of the Netherlands
1987-1990
Methane emissions due to accidents in the oil and natural gas sector are very challenging monitor, hence seldom considered emission inventories reporting. One of main reasons is lack measurements during such events. Here we report detection large methane from a well blowout Ohio February March 2018 total column spaceborne Tropospheric Monitoring Instrument (TROPOMI). From these data, derive rate 120 ± 32 metric tons per hour. This hourly twice that widely reported Aliso Canyon event...
The balloon-borne instrument TELIS (TErahertz and submillimetre LImb Sounder) is a three-channel superconducting heterodyne spectrometer for atmospheric research use. It detects spectral emission lines of stratospheric trace gases that have their rotational transitions at THz frequencies. One the channels based on integrated receiver (SIR) technology. We demonstrate first time capabilities SIR technology spectroscopy in general, limb sounding particular. also show application not limited to...
Abstract. The Tropospheric Monitoring Instrument (TROPOMI) is the single instrument on board ESA Copernicus Sentinel-5 Precursor satellite. TROPOMI a nadir-viewing imaging spectrometer with bands in ultraviolet and visible, near infrared shortwave (SWIR). An accurate spectral response function (ISRF) required SWIR band where absorption lines of CO, methane water vapor overlap. In this paper, we report determination TROPOMI-SWIR ISRF during an extensive on-ground calibration campaign....
Abstract. This paper discusses the basic concept of calibration SCIAMACHY instrument and remaining open issues. is a scanning Limb/Nadir spectrometer covering wavelength range from 212 nm to 2386 nm. It was launched on-board ENVISAT in February 2002. In general performance excellent: performs as tested on ground there only very minor degradation time. The exception unexpected formation water ice infrared channels 7 8 that attenuates signal light leak channel 7. Both effects will be...
In a one-component low-pressure gas, velocity-selective excitation can produce drift due to state-dependent molecule-surface interaction. The first observation of this effect is reported for rovibrationally excited ${\mathrm{CH}}_{3}$F colliding with quartz. Experiments involving different rotational sublevels within the ${\ensuremath{\nu}}_{3}$ vibrational band indicate strong dependence upon quantum number.
Abstract. The shortwave infrared (SWIR) spectrometer module of the Tropospheric Monitoring Instrument (TROPOMI), on board ESA Copernicus Sentinel-5 Precursor satellite, is used to measure atmospheric CO and methane columns. For this purpose, calibrated radiance measurements are needed that minimally contaminated by instrumental stray light. Therefore, a method has been developed applied in an on-ground calibration campaign characterize light detail using monochromatic quasi-point source....
We report on the development and demonstration of a MHz frequency domain multiplexing (FDM) technology to read out arrays cryogenic transition edge sensor (TES) X-ray microcalorimeters. In our FDM scheme, TESs are AC-biased at different resonant frequencies in low range through an array high-$Q$ LC resonators. The current signals all summed superconducting quantum interference devices (SQUIDs). have demonstrated for readout 31 pixels using room temperature electronics, filters TES developed...
Using a new and sensitive technique, experiments on light-induced drift are performed vibrationally excited ${\mathrm{CH}}_{3}$F in the buffer gases He, Ne, Ar, Kr, Xe, ${\mathrm{CH}}_{3}$Cl. For noble gases, difference collision frequency between ground- excited-state with respect to buffer-gas molecules is found range from 0.14% for He 0.56% Xe. polar gas ${\mathrm{CH}}_{3}$Cl, this value be 0.98%.
Abstract. During its first year in operation the short-wave infrared (SWIR) Tropospheric Monitoring Instrument (TROPOMI) was calibrated in-flight and performance monitored. In this paper we present results of calibration ongoing instrument monitoring. This includes determination background signals, noise performance, spectral response function (ISRF) stability, stray-light stability. From these results, number incurred dead bad pixels due to cosmic-ray impacts is determined. The light-path...
TROPOMI is the single instrument on ESA's Sentinel 5 precursor satellite to be launched in October 2016. will measure atmospheric constituents absorbing UV-SWIR wavelength range, being O3, NO2, SO2, CH4, CO, CH2O, and aerosol properties. a sun back-scatter line of SCIAMACHY OMI with 4 spectrometer bands spectral resolution 0.25 – 0.5 nm. Following earlier sensors, firstly spatial improved by factor 6 (OMI) 7 x km2 at same time sensitivity an order magnitude. The paper discusses performances...
TELIS (Terahertz and submm Limb Sounder) is a cooperative European project to develop three-channel heterodyne balloon-based spectrometer for measuring variety of atmospheric constituents within the lower stratosphere. The 600-650GHz channel based on phase-locked Superconducting Integrated Receiver (SIR). SIR on-chip combination low-noise SIS mixer with quasioptical antenna, superconducting Flux Flow Oscillator (FFO) acting as Local (LO) an harmonic (HM) FFO phase locking. A number new...
In this report an overview of the results on development a single-chip superconducting integrated receiver for Terahertz Limb Sounder (TELIS) balloon project intended to measure variety stratosphere trace gases is presented. The Superconducting Integrated Receiver (SIR) comprises in one chip planar antenna with superconductor-insulator-superconductor (SIS) mixer, Flux Flow Oscillator (FFO) acting as local oscillator (LO) and second SIS harmonic mixer (HM) FFO phase locking. As result design...
We present the status of our immersed diffraction grating technology, as developed at SRON and their multilayer optical coatings CILAS. Immersion means that takes place inside medium, in case silicon. The high refractive index silicon medium boosts resolution dispersion. Ultimate control over groove geometry yields efficiency polarization control. Together, these aspects lead to a huge reduction spectrometer volume. This has opened new avenues for design spectrometers operating...
The X-IFU is the cryogenic spectrometer onboard future ATHENA X-ray observatory. It based on a large array of TES microcalorimeters, which works in combination with Cryogenic AntiCoincidence detector (CryoAC). This necessary to reduce particle background level thus enabling part mission science goals. Here we present first joint test and CryoAC Demonstration Models, performed FDM setup. We show that it possible operate properly both detectors, provide preliminary demonstration...
Surface light-induced drift arises under velocity-selective excitation of a low-pressure gas if the accommodation coefficient \ensuremath{\alpha} for tangential momentum transfer to surface depends on state particles. A kinetic description this effect is presented. Experiments were performed rovibrationally excited ${\mathrm{CH}}_{3}$F colliding with quartz at 300 K. It found that rotational (J,K) molecule much more strongly than vibrational state. For transition...
A Superconducting Integrated Receiver (SIR) was proposed more than 10 years ago and has since then been developed up to the point of practical applications. We have demonstrated for first time capabilities SIR technology heterodyne spectroscopy both in laboratory at remote operation under harsh environmental conditions atmospheric research. Within a main components needed superconducting receiver such as an SIS-mixer with quasi-optical antenna, Flux-Flow oscillator (FFO) local oscillator,...
A new phenomenon, light-induced viscous flow in a one-component gas, is observed ${\mathrm{CH}}_{3}$F upon velocity-selective vibrational excitation. The effect originates from state-dependent kinetic collision rate combination with nonuniform illumination. theory for this derived using Chapman-Enskog approach. Good agreement between and experiments the near-hydrodynamic regime found.
We have developed a novel diffraction grating based on lithographical techniques and anisotropic etching in silicon. The is designed for the short-wave-infrared channel of TROPOMI imaging spectrometer that will be launched ESA's Sentinel 5 Precursor mission to monitor trace gases earth atmosphere. Stringent requirements both properties quality spectra translate high-tech grating. In our design dispersion resolution increased with factor 3.4 respect conventional gratings by using immersion,...
The TROPOMI Earth-observing instrument is the single payload on board ESA's Sentinel-5 Precursor mission. It successor of Sciamachy (ESA ENVISAT) and OMI (NASA EOS/Aura), combines improves best both instruments. copies push broom observation geometry allowing for daily global coverage due to its instantaneous field view 108 degrees, or 2600 km swath ground. From 2305 - 2385 nm Short-Wave Infra-Red (SWIR) observational band copied with which methane carbon monoxide are observed. This paper...
The influence of rotational alignment on molecule–surface interaction is studied for CH3F and OCS colliding with a glass surface. Experiments were performed at 285 K the technique surface light-induced drift using flat channel, being produced through excitation by linearly polarized light. For molecules having energy well below thermal, it found that accommodation coefficient parallel momentum α, which can be related to trapping/desorption probability, larger if angular J (‘‘cartwheeling...