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Swartz, W.H. (author), Krotkov, N.A. (author), Lamsal, L.N. (author), Otter, G.C.J. (author), van Kempen, F.C.M. (author), Boldt, J.D. (author), Morgan, M.F. (author), der Laan, L.W.van (author), Zimbeck, W.R. (author), Storck, S.M. (author), Post, Z.J. (author), Janz, S.J. (author), Kowalewski, M.G. (author), Li, C. (author), Veefkind, J.P. (author), Levelt, P.F. (author)Adverse air quality impacts human health and climate and has implications for environmental equity. The Compact Hyperspectral Air Pollution Sensor (CHAPS) is a newly designed small imaging spectrometer for remote sensing of nitrogen dioxide (NO2) and other air pollutants from space. It incorporates two emerging technologies, to achieve the...conference paper 2021
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Otter, G.C.J. (author), Day, J.P.R. (author), Di Iorio, E. (author), Pelica Páscoa, M.I. (author), Speet, B.G. (author), Dijkhuizen, N. (author), Snel, R.C. (author), van der Togt, O.E. (author)The cheapest method for an instrument to perform radiometric monitoring in orbit is to compare its radiometric response from a scene to the known radiance of that same scene. This is known as vicarious calibration. The known radiance of this scene comes mostly from other space instruments. The limiting factors of this vicarious calibration...conference paper 2021
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Jansen, R. (author), Day, J.P.R. (author), Vink, H.J.P. (author), de Vreugd, J. (author), van Beekum, E.R.J. (author), van der Laan, L.W. (author), van 't Hof, A.C.A. (author), Gielesen, W.L.M. (author), Koehler, J. (author)Sentinel-5 is an Earth atmospheric monitoring mission developed within the Copernicus program. The mission objective is to monitor the composition of the Earth's atmosphere on a daily basis. TNO is developing the UV1 spectrometer subsystem as well as the two telescope subsystems. In this paper, the design of the UV1 spectrometer is described and...conference paper 2019
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Burkhardt, M. (author), Rathje, T. (author), Lehr, D. (author), Erdmann, L. (author), Helgert, M. (author), Triebel, P. (author), Diehl, T. (author), Gatto, A. (author), van der Valk, N.C.H. (author), Vink, H.J.P. (author), Jansen, R. (author), Day, J.P.R. (author), Gielesen, W.L.M. (author)The first diffraction gratings on curved substrates were manufactured by employing ruling engines by H.A. Rowland. Due to the ruling principle, these gratings are characterized by equidistant parallel lines if the line pattern is projected along the optical axis onto a tangential plane in the vertex of the grating substrate. The Offner...conference paper 2019
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Court, A.J. (author), Bezy, J.L. (author), Levelt, P. (author), Siegl, M. (author), Leemhuis, A.P. (author), van de Valk, N.C.J. (author), Veefkind, P. (author)The impact of NO2 and other atmospheric trace gases on health and the environment is now acknowledged by governments around the world. The sources, both natural and anthropogenic, have been shown to affect the quality of life due to low air quality in densely populated areas. Consequently, the need for accurate global NO2 measurements with high...conference paper 2018