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Doelman, N.J. (author), van den Braber, R. (author), Kasparek, W. (author), Erckmann, V. (author), Bongers, W. (author), Stober, J. (author), Fritz, E. (author), Dekker, B. (author), Krijger, B. (author), Hollmann, F. (author), Michel, G. (author), Noke, F. (author), Purps, F. (author), Maraschek, M. (author), Monaco, F. (author), Müller, S. (author), Schütz, H. (author), Wagner, D. (author)
An adaptive mirror control strategy for tuning an optical resonator is described. The control approach is modelfree and uses a small-amplitude perturbation signal to enable real-time estimation of the cost function gradient. The strategy has similarities with the approaches of 'stochastic approximation' and 'extremum seeking control', which are...
conference paper 2013
document
Bijster, R.J.F. (author), de Vreugd, J. (author), Sadeghian Marnani, H. (author)
The optical beam deflection (OBD) technique is used in many Atomic Force Microscopes to measure the motion of a cantilever as it probes the scanned surface. From the measured rotation, surface and sub-surface properties of the sample can be deduced. To maximize the sensitivity of the measurement, the combination of laser and cantilever should be...
conference paper 2013
document
Laan, E.C. (author), Esposito, M. (author), Monna, B. (author), Silvio Conticello, S. (author), Stelwagen, F. (author), Theil, S. (author), Steffes, S. (author), Dumke, M. (author), Heise, D. (author), Sagliano, M. (author), Oosterling, J.A.J. (author), Nijkerk, M.D. (author), Duivenvoorde, T. (author), Berkhout, J. (author), Yanson, Y. (author), Schulte, J. (author), Skaborn, D. (author), Durkut, M. (author), Söderholm, S. (author), Samaan, M.A. (author), Visee, R. (author)
SINPLEX is a sensor suite for spacecraft navigation purposes. This paper addresses the current status of the SINPLEX prototype and the systems engineering process that has led to this status. The SINPLEX prototype is currently being integrated with the aim to demonstrate Technology Readiness Level 4, i.e. a component and/or breadboard validation...
conference paper 2013
document
Korkiakoski, V. (author), Keller, C.U. (author), Doelman, N.J. (author), Codona, J. (author), Kenworthy, M. (author)
We show how differential optical transfer function (dOTF) method is used to calibrate an adaptive optics setup using a spatial light modulator. SLM response, rotation and registration are measured sufficiently accurately for high-order WF correction. © OSA 2013.
conference paper 2013
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Kögel, H. (author), Gerardi, D. (author), Pijnenburg, J.A.C.M. (author), Gohlke, M. (author), Schuldt, T. (author), Johann, U. (author), Braxmaier, C. (author), Weise, D. (author)
An alternative payload concept with in-field pointing for the laser interferometer space antenna utilizes an actuated mirror in the telescope for beam tracking to the distant satellite. This actuation generates optical pathlength variations due to the resulting beamwalk over the surface of subsequent optical components, which could possibly have...
article 2013
document
van Baars, G.E. (author)
public lecture 2013
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Sadeghian Marnani, H. (author), van Keulen, F. (author), Goosen, H. (author)
Nowadays, mechanical designers and engineers of elastic structures at ultra-small scales face an interesting challenge; traditional flexures with several components, mechanical joints/welds and linkages are almost impossible to manufacture with existing microsystem fabrication technologies. Therefore, the majority of mechanical components,...
bookPart 2013
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Smith, C.S. (author), Marinicǎ, R. (author), den Dekker, A.J. (author), Verhaegen, M. (author), Korkiakoski, V. (author), Keller, C.U. (author), Doelman, N.J. (author)
We propose an efficient approximation to the nonlinear phase diversity (PD) method for wavefront reconstruction and correction from intensity measurements with potential of being used in real-time applications. The new iterative linear phase diversity (ILPD) method assumes that the residual phase aberration is small and makes use of a first...
article 2013
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de Boer, B.M. (author), Durkut, M. (author)
A prototype miniaturized digital sun sensor (miniDSS) was developed by TNO. It is expected to be launched on QuadSat for in-orbit demonstration. The single-chip sun sensor comprises an application specific integrated circuit (ASIC) on which an active pixel sensor (APS), read-out and processing circuitry as well as communication circuitry are...
conference paper 2013
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Bolder, J.J. (author), Witvoet, G. (author), de Baar, M.R. (author), van de Wouw, N. (author), Haring, M.A.M. (author), Westerhof, E. (author), Doelman, N.J. (author), Steinbuch, M. (author)
The systematic design of a robust adaptive control strategy for the sawtooth period using electron cyclotron current drive (ECCD) is presented. Recent developments in extremum seeking control (ESC) are employed to derive an optimized controller structure and offer practical tuning guidelines for its parameters. In this technique a cost function...
article 2012
document
Bongers, W.A. (author), Kasparek, W. (author), Doelman, N.J. (author), van den Braber, R. (author), van den Brand, H. (author), Meo, F. (author), de Baar, M.R. (author), Amerongen, F.J. (author), Donné, A.J.H. (author), Elzendoorn, B.S.Q. (author), Erckmann, V. (author), Goede, A.P.H. (author), Giannone, L. (author), Grünwald, G. (author), Hollman, F. (author), Kaas, G. (author), Krijger, B. (author), Michel, G. (author), Lubyako, L. (author), Monaco, F. (author), Noke, F. (author), Petelin, M. (author), Plaum, B. (author), Purps, F. (author), ten Pierik, J.G.W. (author), Schüller, C. (author), Slob, J.W. (author), Stober, J.K. (author), Schütz, H. (author), Wagner, D. (author), Westerhof, E. (author), Ronden, D.M.S. (author)
A CW capable inline electron cyclotron emission (ECE) separation system for feedback control, featuring oversized corrugated waveguides, is commissioned on ASDEX upgrade (AUG). The system is based on a combination of a polarization independent, non-resonant, Mach-Zehnder diplexer equipped with dielectric plate beam splitters [2, 3] employed as...
conference paper 2012
document
Bolder, J.J. (author), Witvoet, G. (author), de Baar, M.R. (author), van de Wouw, N. (author), Haring, M.A.M. (author), Westerhof, E. (author), Doelman, N.J. (author), Steinbuch, M. (author)
The sawtooth instability is a repetitive phenomenon occurring in plasmas of tokamak nuclear fusion reactors. Experimental studies of these instabilities and the effect they have on the plasma (notably the drive of secondary instabilities and consequent performance reduction) for a wide variety of plasma conditions is an important line of study...
conference paper 2012
document
Doelman, N.J. (author), van den Braber, R. (author), Kasparek, W. (author), Erckmann, V. (author), Bongers, W. (author), Krijger, B. (author), Stober, J. (author), Fritz, E.C. (author), Dekker, A. (author), Klop, W.A. (author), Hollmann, F. (author), Michel, G. (author), Noke, F. (author), Purps, F. (author), de Baar, M. (author), Maraschek, M. (author), Monaco, F. (author), Müller, S. (author), Schütz, H. (author), Wagner, D. (author)
High-power resonant diplexers for millimetre waves have various promising applications in ECRH systems. The round-trip resonator length of a diplexer needs to be accurately tuned to match its prescribed functionality. For this purpose one of the mirrors in the FADIS MkIIa diplexer has been mounted on a motion system, in order to control the...
conference paper 2012
document
Witvoet, G. (author), Steinbuch, M. (author), de Baar, M.R. (author), Doelman, N.J. (author), Westerhof, E. (author)
The sawtooth instability is associated with the triggering of neo-classical tearing modes, core fuelling, α-confinement and the exhaust of thermal helium. Sawtooth control is therefore important for optimal reactor performance in ELMy H-modes. Control schemes for the sawtooth period have been published in the literature, but the systematic...
article 2012
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Lauret, M. (author), Felici, F. (author), Witvoet, G. (author), Goodman, T.P. (author), Vandersteen, G. (author), Sauter, O. (author), de Baar, M.R. (author)
Corroborating evidence is presented that the sawtooth period can follow the modulation frequency of an externally applied high power electron cyclotron wave source. Precise, fast and robust open loop control of the sawtooth period with a continuously changing reference period has been achieved. This period locking is not associated with the...
article 2012
document
van den Dool, T.C. (author), Kruizinga, B. (author), Braam, B.C. (author), Hamelinck, R.F.M.M. (author), Loix, N. (author), van Loon, D. (author), Dams, J. (author)
TNO, together with its partners, have designed a cryogenic scanning mechanism for use in the SAFARI Fourier Transform Spectrometer (FTS) on board of the SPICA mission. SPICA is one of the M-class missions competing to be launched in ESA's Cosmic Vision Programme in 2022. JAXA leads the development of the SPICA satellite and SRON is the prime...
conference paper 2012
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van der Heiden, M.S. (author), Henken, K.R. (author), Cheng, L.K. (author), van den Bosch, B.G. (author), van den Braber, R. (author), Dankelman, J. (author), van den Dobbelsteen, J.J. (author)
Background: The mechanical properties of small minimally invasive instruments are limited and thus must be treated as flexible instruments. Proper functional behavior of these instruments can be significantly enhanced when the instrument is equipped with a shape sensor to track the path of the flexible instrument. MRI compatible instruments, and...
conference paper 2012
document
Veefkind, J.P. (author), Aben, I. (author), McMullan, K. (author), Förster, H. (author), de Vries, J. (author), Otter, G. (author), Claas, J. (author), Eskes, H.J. (author), de Haan, J.F. (author), Kleipool, Q. (author), van Weele, M. (author), Hasekamp, O. (author), Hoogeveen, R. (author), Landgraf, J. (author), Snel, R. (author), Tol, P. (author), Ingmann, P. (author), Voors, R. (author), Kruizinga, B. (author), Vink, R. (author), Visser, H. (author), Levelt, P.F. (author)
The ESA (European Space Agency) Sentinel-5 Precursor (S-5 P) is a low Earth orbit polar satellite to provide information and services on air quality, climate and the ozone layer in the timeframe 2015-2022. The S-5 P mission is part of the Global Monitoring of the Environment and Security (GMES) Space Component Programme. The payload of the...
article 2012
document
van Eekeren, A.W.M. (author), Schutte, K. (author), Dijk, J. (author), Schwering, P.B.W. (author), van Iersel, M. (author), Doelman, N.J. (author)
In general, long range visual detection, recognition and identification are hampered by turbulence caused by atmospheric conditions. Much research has been devoted to the field of turbulence compensation. One of the main advantages of turbulence compensation is that it enables visual identification over larger distances. In many (military)...
conference paper 2012
document
Schutte, K. (author), van Eekeren, A.W.M. (author), Dijk, J. (author), Schwering, P.B.W. (author), van Iersel, M. (author), Doelman, N.J. (author)
In general, long range visual detection, recognition and identification are hampered by turbulence caused by atmospheric conditions. Much research has been devoted to the field of turbulence compensation. One of the main advantages of turbulence compensation is that it enables visual identification over larger distances. In many (military)...
conference paper 2012
Searched for: subject%3A%22OM%255C%2B%255C-%255C%2BOpto%255C-Mechatronics%22
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