Searched for: subject%3A%22Freeform%255C%2Boptics%22
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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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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
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Nijkerk, M.D. (author), Gruber, J.M. (author), Boonacker, B. (author)
We present a novel optical design tool that makes use of an evolutionary global optimization algorithm. The algorithm has several characteristics that make it well-suited for freeform optics design. With the design tool it is no longer necessary to make the distinction between paraxial degrees of freedom and degrees of freedom related to...
conference paper 2018
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Nijkerk, M.D. (author), van Venrooy, B. (author), van Doorn, P.J. (author), Henselmans, R. (author), Draaisma, F. (author), Hoogstrate, A.M. (author)
In this paper, we discuss the two-mirror pushbroom telescope for TROPOMI. Using freeform optics, it has unprecedented resolution. The complete cycle of freeform optical design, analysis, manufacturing, metrology and functional test on a breadboard setup is described, focusing on the specific complexities concerning freeforms. The TROPOMI flight...
conference paper 2012
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Henselmans, R. (author), Cacace, L.A. (author), Kramer, G.F.Y. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author)
Aspherical and freeform optics are applied to reduce geometrical aberrations as well as to reduce the required number of components, the size and the weight of the system. To measure these optical components with nanometre level uncertainty is a challenge. The NANOMEFOS machine was developed to provide suitable metrology (high accuracy,...
article 2011
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Henselmans, R. (author), Gubbels, G.P.H. (author), van Drunen, C. (author)
The NANOMEFOS machine is capable of fast, non-contact and universal measurement of aspheres and freeforms, up to ø500 mm with a measurement uncertainty below 30 nm (2σ). It is now being applied in asphere and freeform production at TNO.
conference paper 2010
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Nijkerk, M.D. (author), van der Togt-Marinescu, O.E. (author), Gubbels, G.P.H. (author)
A freeform optical surface is typically defined as any surface that does not have an axis of rotational symmetry. These surfaces provide additional degrees of freedom that can lead to improved performance compared to systems that make use solely of conventional optics. The benefits of using freeforms are: • Less optics can be used in the opto...
conference paper 2010
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Braam, B.C. (author), Meijer, E.A. (author), Nijenhuis, J.N. (author), Vink, R.J.P. (author), Kamphues, F.G. (author), TNO Industrie en Techniek (author)
TNO is developing the Basic Angle Monitoring Opto-Mechanical Assembly for the GAIA mission of ESA, a space telescope that will create a map of the universe including distant stars and planets. GAIA is being built by EADS Astrium and scheduled for launch in 2011. Due to its stability and hardness properties, Silicon Carbide has been chosen for...
conference paper 2009
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Henselmans, R. (author), Cacace, L.A. (author), Kramer, G.F.I. (author), Rosielle, P.C.J.N. (author), Steinbuch, M. (author), TNO Industrie en Techniek (author)
This paper shows the machine concept, the realization and the test results of the completed NANOMEFOS non-contact measurement machine for freeform optics. The separate short metrology loop results in a stability at standstill of 0.9 nm rms over 0.1 s. Measurements of a tilted flat show a repeatability of 2-4 nm rms, depending on the applied tilt...
conference paper 2009
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TNO Industrie en Techniek (author), Gubbels, G.P.H. (author), Venrooy, B.W.H. (author), Henselmans, R. (author)
The breakthrough of freeform optics is limited by manufacturing and metrology technology. However, today's manufacturing machines like polishing robots and diamond turning machines are accurate enough to produce good surface quality, so the question is how accurate can a freeform be produced. To investigate how accurate freeform optics can be...
conference paper 2009
Searched for: subject%3A%22Freeform%255C%2Boptics%22
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