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Solomatine, D.P. (author), Velickov, S. (author), Bhattacharya, B. (author), Van der Wal, B. (author)The project was aimed at exploring the possibilities of a new paradigm in modelling - data-driven modelling, often referred as "data mining". Several application areas were considered: sedimentation problems in the Port of Rotterdam, automatic soil classification on the basis of cone penetration tests, prediction of water levels in the ocean,...report 2003
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Swinkels, B.L. (author), Wendrich, T.J. (author), Bhattacharya, N. (author), Wielders, A.A. (author), Braat, J.J.M. (author)Space interferometers consisting of several free flying telescopes, such as the planned Darwin mission, require a complex metrology system to make all the components operate as a single instrument. Our research focuses on one of its sub-systems that measures the absolute distance between two satellites with high accuracy. For Darwin the required...conference paper 2004
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- Somers, P.A.A.M. (author), Bhattacharya, N. (author) journal article 2005
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- Bhattacharya, Baidurya (author), Basu, R. (author), Srinivasan, S. (author) journal article 2005
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Uncalibrated temporal phase stepping in a two-channel spatially phase stepped speckle interferometerBhattacharya, N. (author), Somers, P.A.A.M. (author)Poster of the Optics Research Group TU Delft Supported by the Technology Foundation STW, applied science division of NWO and the technology program of the Ministry of Economic Affairs.journal article 2005
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Koek, W.D. (author), Bhattacharya, N. (author), Braat, J.J.M. (author), Ooms, T.A. (author), Westerweel, J. (author)A theoretical analysis describing the dependence of the signal-tonoise ratio (SNR) on the number of pixels and the number of particles is presented for in-line digital particle holography. The validity of the theory is verified by means of numerical simulation. Based on the theory we present a practical performance benchmark for digital...journal article 2005
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Koek, W.D. (author), Chan, V.S.S. (author), Ooms, T.A. (author), Bhattacharya, N. (author), Westerweel, J. (author), Braat, J.J.M. (author)We present a novel holographic particle image velocimetry (HPIV) system using a reversible holographic material as the recording medium. In HPIV the three-dimensional flow field throughout a volume is detected by adding small tracer particles to a normally transparent medium. By recording the particle distribution twice with a known time shift...conference paper 2005
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Somers, P.A.A.M. (author), Bhattacharya, N. (author)A polarization phase stepping method is presented based on the use of a polarization plane rotator that establishes a relative phase shift between two counter-rotating circularly polarized beams. The phase step can be made relatively accurate, since it just depends on the accuracy with which the rotator is manufactured, and not on its...conference paper 2005
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Swinkels, B.L. (author), Bhattacharya, N. (author), Wielders, A.A. (author), Braat, J.J.M. (author)Future space missions, among which the Darwin Space Interferometer, will consist of several free flying satellites. A complex metrology system is required to have all the components fly accurately in formation and have it operate as a single instrument. Our work focuses on a possible implementation of the sub-system that measures the absolute...conference paper 2005
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Vuelban, E.M. (author), Bhattacharya, N. (author), Braat, J. (author)We propose and demonstrate a novel liquid based deformable mirror (LDM). The proposed LDM consists of an array of vertically oriented open capillary channels immersed in a pool of two immiscible liquids. A free-floating thin reflective membrane serves as the reflecting surface. By means of jet action, membrane deformation is induced. The control...conference paper 2005
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Swinkels, B.L. (author), Bhattacharya, N. (author), Braat, J.J.M. (author)Absolute distance measurements can be performed with an interferometric method that uses only a single tunable laser. This method has one major drawback, because a small target movement of the order of one wavelength during a measurement will be interpreted as a movement of one synthetic wavelength. This effect is usually mitigated by adding a...journal article 2005
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Bhattacharya, B. (author)Abstract not availabledoctoral thesis 2005
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Vuelban, E.M. (author), Bhattacharya, N. (author), Braat, J.J.M. (author)We propose and demonstrate a novel liquid deformable mirror, based on electrocapillary actuation, for highorder wavefront correction. The device consists of a two-dimensional array of vertically oriented microchannels filled with two immiscible liquids, an aqueous electrolyte, and a viscous dielectric liquid, where the dielectric liquid...journal article 2006
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Vuelban, E.M. (author), Bhattacharya, N. (author), Braat, J.M. (author)Recently, a new type of liquid based deformable mirror has been proposed and demonstrated. The device consists of an array of vertically oriented open capillary channels immersed in a pool of two immiscible liquids and a freefloating reflective membrane, which serves as the reflecting surface. Liquid surface and membrane deformations are...conference paper 2006
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Somers, P.A.A.M. (author), Bhattacharya, N. (author)Phase stepping algorithms are mostly based on three or more interferograms that can either be acquired sequentially, involving some temporal phase stepping mechanism, or in parallel. When a phase step is applied between acquisitions, object phase changes may cause phase errors when calculating phase. A new system that allows the object to change...conference paper 2006
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Ahn, C.H. (author), Bhattacharya, A. (author), Di Ventra, M. (author), Eckstein, J.N. (author), Frisbie, C.D. (author), Gershenson, M.E. (author), Goldman, A.M. (author), Inoue, I.H. (author), Mannhart, J. (author), Millis, A.J. (author), Morpurgo, A.F. (author), Natelson, D. (author), Triscone, J.M. (author)Application of the field-effect transistor principle to novel materials to achieve electrostatic doping is a relatively new research area. It may provide the opportunity to bring about modifications of the electronic and magnetic properties of materials through controlled and reversible changes of the carrier concentration without modifying the...journal article 2006
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- Somers, P.A.A.M. (author), Bhattacharya, N. (author) journal article 2007
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Ghatak, K.P. (author), Bhattacharya, S. (author), Bhowmik, S. (author), Benedictus, R. (author), Choudhury, S. (author)We study thermoelectric power under strong magnetic field (TPM) in carbon nanotubes (CNTs) and quantum wires (QWs) of nonlinear optical, optoelectronic, and related materials. The corresponding results for QWs of III-V, ternary, and quaternary compounds form a special case of our generalized analysis. The TPM has also been investigated in QWs of...journal article 2008
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Ghatak, K.P. (author), Bhattacharya, S. (author), Bhowmik, S. (author), Benedictus, R. (author), Choudhury, S. (author)We study the Einstein relation for the diffusivity to mobility ratio (DMR) in quantum wires (QWs) of III-V, ternary, and quaternary materials in the presence of light waves, whose unperturbed energy band structures are defined by the three band model of Kane. It has been found, taking n-InAs, n-InSb, n-Hg1?xCdxTe, n-In1?xGaxAsyP1?y lattice...journal article 2008
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Cui, M. (author), Bhattacharya, N. (author), Urbach, H.P. (author), Van den berg, S.A. (author)We experimentally demonstrate that a stabilized femtosecond frequency comb can be applied as a tool for distance measurement. The scheme is based on optical interference between individual pulses in a Michelson type interferometer. The cross-correlation functions between individual pulses with a distance of around 15 meter and 30 meter are...conference paper 2008