Searched for: subject%3A%22Interferometer%22
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Yan, T. (author), Langille, J.A. (author), Ward, W.E. (author), Gault, W.A. (author), Scott, A. (author), Bell, A. (author), Touahiri, D. (author), Zheng, S.H. (author), Zhang, C. (author)
A new compact static wind imaging interferometer, called the Birefringent Doppler Wind Imaging Interferometer (BIDWIN), has been developed for the purpose of observing upper atmospheric winds using suitably isolated airglow emissions. The instrument combines a fieldwidened birefringent delay plate placed between two crossed Wollaston prisms with...
article 2021
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van Brug, H. (author), Visser, H. (author), Brenny, B.J.M. (author), van der Valk, N.C.J. (author), Sierk, B. (author), Heliere, A. (author), Rusli, S. (author), Landgraf, J. (author)
CarbonHIGS is a 2D imager designed to measure the enhancement of CO2 concentration in emission plumes from power plants. The origin of HIGS, and the physics of the working principle will be explained. Two possible implementations of HIGS will be presented, i.e. one that uses power splitting while the other one uses polarization splitting. The...
conference paper 2020
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Peternella, F.G. (author), Esselink, T. (author), Dorsman, B. (author), Harmsma, P.J. (author), Horsten, R.C. (author), Zuidwijk, T. (author), Urbach, H.P. (author), Adam, A.L.C. (author)
In this paper, the design and the characterization of a novel interrogator based on integrated Fourier transform (FT) spectroscopy is presented. To the best of our knowledge, this is the first integrated FT spectrometer used for the interrogation of photonic sensors. It consists of a planar spatial heterodyne spectrometer, which is implemented...
article 2019
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van Groenestijn, G.J.A. (author), Jansen, T.H. (author), van Neer, P.L.M.J. (author), Jacobs, M.J. (author), Cheng, L.K. (author)
Elastic guided waves are carriers of information of the (change in) condition of plate-like structures like windturbine blades, airplane wings and road surfaces on bridges. To measure these guided waves we do not have to use piezos. Other sensors offer interesting benefits like contactless sensing, embedding, or measuring without electricity....
conference paper 2018
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van Gulik, R.J.J. (author), de Boer, B.M. (author), Harmsma, P.J. (author)
In this paper, we compare ring resonator and three-port Mach-Zehnder Interferometer (MZI) devices fabricated on silicon-on-insulator for the purpose of refractive index sensing. Their respective sensitivities and limits of detection (LOD) were determined with NaCl solutions. A sensitivity of 113.07 nm per refractive index unit (RIU) and LOD of 2...
article 2017
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Cheng, L.K. (author), Hagen, R.A.J. (author), Schriek, L.N. (author), Toet, P.M. (author), van der Togt, O.E. (author)
The presented interferometer concept enables high-accuracy target displacement measurement in difficult accessible locations and the development of small fiber optic sensor to measure other physical parameters e.g. pressure, vibration, gravity force, etc.. Furthermore, this configuration is basically insensitive to disturbances to the lead fiber...
conference paper 2017
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Witvoet, G. (author), Human, J.D. (author), Maniscalco, M.P. (author)
An active tilt mirror mechanism, meant for correction of the constellation breathing of the evolved Laser Interferometer Space Antenna, has been designed and realized. Its open-loop performance has been characterized in both time and frequency domain. Based on this, a feedback controller has been designed and the resulting closed-loop...
conference paper 2016
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Koek, W.D. (author), van Zwet, E.J. (author)
When using a commonly-used quadri-wave lateral shearing interferometer wavefront sensor (QWLSI WFS) for beam size measurements on a high power CO2 laser, artefacts have been observed in the measured irradiance distribution. The grating in the QWLSI WFS not only generates the diffracted first orders that are required for introducing the shear,...
conference paper 2015
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Peng, X.B. (author), Hirsch, M. (author), Köppen, M. (author), Fellinger, J. (author), Bykov, V. (author), Schauer, F. (author), Vliegenthart, W.A. (author)
A 10 channels interferometer will be used in the Wendelstein 7-X (W7-X) for plasma density control and density profile tracking with laser beams passing through the plasma. Due to complex shape of non-planar modular coils and divertor structure, there are no large poloidally opposite ports on the plasma vessel (PV). Therefore 10 in-vessel Corner...
article 2014
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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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Jellema, W. (author), Kruizinga, B. (author), Visser, H. (author), van den Dool, T.C. (author), Santos, C.P. (author), Redondo, J.T. (author), Eggens, M. (author), Ferlet, M. (author), Swinyard, B. (author), Dohlen, K. (author), Griffin, D. (author), Fernandez, L.M.G. (author), Belenguer, T. (author), Matsuhara, H. (author), Kawada, M. (author), Doi, Y. (author)
The Safari instrument on the Japanese SPICA mission is a zodiacal background limited imaging spectrometer offering a photometric imaging (R ≈ 2), and a low (R = 100) and medium spectral resolution (R = 2000 at 100 μm) spectroscopy mode in three photometric bands covering the 34-210 μm wavelength range. The instrument utilizes Nyquist sampled...
conference paper 2012
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Voigt, D. (author), Ellis, J.D. (author), Verlaan, A.L. (author), Bergmans, R.H. (author), Spronck, J.W. (author), Munnig Schmidt, R.H. (author)
The accuracy of high-end industrial equipment and the reliability of produced goods can be limited by dimensional drift phenomena. Examples are the life cycle stability of instrumentation for space missions and the tight requirements for measurement uncertainty in the integrated circuit semiconductor industry. Re-calibration intervals of...
conference paper 2011
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Harmsma, P. (author), Staats, J.P. (author), Lo Cascio, D.M.R. (author), Cheng, L.K. (author)
The wavelength of a narrow-band optical signal can be accurately tracked by means of an interferometer having a fixed path length difference. For example, a low-cost Fiber Bragg Grating (FBG) interrogation system which tracks the FBG reflection wavelength over time can be based on such an interferometer. Alternatively, an interferometer is...
conference paper 2011
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Pozo Torres, J.M. (author), Westerveld, W. (author), Harmsma, P.J. (author), Yang, S. (author), Bodis, P. (author), Nieuwland, R. (author), Lagioia, M. (author), Lo Cascio, D.M.R. (author), Staats, J. (author), Schmits, R. (author), Berg, H.V.D. (author), Tabak, E. (author), Green, K. (author), Urbach, H.P. (author), Cheng, L.K. (author), Yousefi, M. (author)
In this paper, we present two examples of photonic sensors based on ring resonators in Silicon-on-Insulator (SOI) waveguide technology as mass production compatible sensing units for the measurement of: strain, and ultrasound. Furthermore, the sensing units are characterized in extreme conditions to validate their robustness in harsh industrial...
conference paper 2011
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Nguyen, M.D. (author), Nazeer, H. (author), Karakaya, K. (author), Pham, S.V. (author), Steenwelle, R. (author), Dekkers, M. (author), Abelmann, L. (author), Blank, D.H.A. (author), Rijnders, G. (author), TNO Industrie en Techniek (author)
This paper reports on the piezoelectric-microelectromechanical system micro-fabrication process and the behavior of piezoelectric stacks actuated silicon cantilevers. All oxide layers in the piezoelectric stacks, such as buffer-layer/bottom-electrode/film/top-electrode: YSZ/SrRuO\3/Pb(Zr, Ti)\3/SrRuO\3, were grown epitaxially on the Si template...
article 2010
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TNO Industrie en Techniek (author), van den Dool, T.C. (author), Hamelinck, R.F.M.M. (author), Kruizinga, B. (author), Gielesen, W.L.M. (author), Braam, B.C. (author), Nijenhuis, J.R. (author), Loix, N. (author), Luyckx, S. (author), van Loon, D. (author), Kooijman, P.P. (author), Swinyard, B.M. (author)
TNO, together with its partners Micromega and SRON, have designed a cryogenic scanning mechanism for use in the SAFARI Fourier Transform Spectrometer (FTS) on board of the SPICA mission. The optics of the FTS scanning mechanism (FTSM) consists of two back-to-back cat's-eyes. The optics are mounted on a central "back-bone" tube which houses all...
conference paper 2010
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Raucoules, D. (author), Bourgine, B. (author), de Michele, M. (author), Le Cozannet, G. (author), Closset, L. (author), Bremmer, C. (author), Veldkamp, H. (author), Tragheim, D. (author), Bateson, L. (author), Crosetto, M. (author), Agudo, M. (author), Engdahl, M. (author), TNO Bouw en Ondergrond (author)
This article presents the main results of the Persistent Scatterer Interferometry Codes Cross Comparison and Certification for long term differential interferometry (PSIC4) project. The project was based on the validation of the PSI (Persistent Scatterer Interferometry) data with respect to levelling data on a subsiding mining area near Gardanne...
article 2009
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TNO Industrie en Techniek (author), Cheng, L.K. (author), Dijkhuizen, N. (author), Nieuwland, R. (author), Faber, A.J. (author), Gielesen, W.L.M. (author), Lucas, J. (author), Boussard-Plédel, C. (author), Houizot, P. (author), Pereira Do Carmo, J. (author)
Various space telescope array systems are being considered to investigate other terrestrial planets orbiting around nearby stars in order to find extra-terrestrial life. One of them is the DARWIN mission of the European Space Agency (ESA). The required technology is the nulling interferometer. The challenge of nulling is making the null in the...
conference paper 2009
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TNO Industrie en Techniek (author), Nijenhuis, J. (author), Visser, H. (author), de Man, H. (author), Dekker, B. (author), Mekking, J. (author), Kamphues, F.G. (author)
ESO is building the Phase Referenced Imaging and Microarcsecond Astronomy (PRIMA) facility for the Very Large Telescope Interferometer (VLTI) in Chile. PRIMA will enable interferometric imaging of very faint objects and high precision astrometry with both Unit (UT) and Auxiliary (AT) telescopes. The PRIMA facility consists of four major sub...
conference paper 2008
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Prinse, W.C. (author), van 't Hof, P.G. (author), Cheng, L.K. (author), Scholtes, J.H.G. (author), TNO Defensie en Veiligheid TNO Industrie en Techniek (author)
For the development of an Exploding Foil Initiator for Insensitive Munitions applications the following topics are of interest: the electrical circuit, the exploding foil, the velocity of the flyer, the driver explosive, the secondary flyer and the acceptor explosive. Several parameters of the EFI have influences on the velocity of the flyer. To...
conference paper 2007
Searched for: subject%3A%22Interferometer%22
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