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Grabarnik, S. (author), Emadi, A. (author), Wu, H. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)This paper reports on the development and validation of a new technology for the fabrication of variable line-spacing non-planar diffraction gratings to be used in compact spectrometers. The technique is based on the standard lithographic process commonly used for pattern transfer onto a flat substrate. The essence of the technology presented...conference paper 2008
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Grabarnik, S. (author), Emadi, A. (author), Wu, H. (author), De Graaf, G. (author), Vdovin, G. (author), Wolffenbutter, R.F. (author)The design and performance of a highly miniaturized spectrometer fabricated using MEMS technologies are reported in this paper. Operation is based on an imaging diffraction grating. Minimizing fabrication complexity and assembly of the micromachined optical and electronic parts of the microspectrometer implies a planar design. It consists of two...conference paper 2008
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- Narasimha, C.Y. (author), Witteveen, C. (author), Zhang, Y. (author), Wu, M. (author), La Poutré, H. (author) conference paper 2008
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Wu, C. (author), Vastenhouw, B. (author), Van der Have, F. (author), Dierckx, R.A. (author), Beekman, F.J. (author)SPECT imaging with low dose or short acquisition time can lead to very noisy reconstructed images. With the USPECT-II system we study the effect of low-count scans, and 3D Gaussian blurring to suppress statistical errors. Three different groups of short-time cardiac rat scans were derived from a longtime scan. Images were reconstructed and then...conference paper 2008
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- Wu, M. (author), De Weerdt, M.M. (author), La Poutré, H. (author), Yadati, C. (author), Zhang, Y. (author), Witteveen, C. (author) conference paper 2009
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Wu, H. (author), Emadi, A. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)The miniaturized IR spectrometer discussed in this paper is comprised of: slit, planar imaging diffraction grating and Thermo-Electric (TE) detector array, which is fabricated using CMOS compatible MEMS technology. The resolving power is maximized by spacing the TE elements at an as narrow as possible pitch, which is limited by processing...conference paper 2010
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Emadi, A. (author), Wu, H. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)This paper reports on a CMOS-Compatible Linear Variable Optical Filter (LVOF) visible micro-spectrometer. The CMOS-compatible post process for fabrication of the LVOF has been used for integration of the LVOF with a CMOS chip containing a 128-element photodiode array and readout circuitry. Fabrication of LVOF involves a process for fabrication...conference paper 2010
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Emadi, A. (author), Grabarnik, S. (author), Wu, H. (author), De Graaf, G. (author), Hedsten, K. (author), Enoksson, P. (author), Correia, J.H. (author), Wolffenbuttel, R.F. (author)This paper reports on the functional and spectral characterization of a microspectrometer based on a CMOS detector array covered by an IC-Compatible Linear Variable Optical Filter (LVOF). The Fabry-Perot LVOF is composed of 15 dielectric layers with a tapered middle cavity layer, which has been fabricated in an IC-Compatible process using resist...conference paper 2010
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Liu, C. (author), Emadi, A. (author), Wu, H. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)A linear array of 128 Active Pixel Sensors has been developed in standard CMOS technology and a Linear Variable Optical Filter (LVOF) is added using CMOS-compatible post-process, resulting in a single chip highly-integrated highresolution microspectrometer. The optical requirements imposed by the LVOF result in photodetectors with small pitch...conference paper 2010
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Wu, H. (author), Emadi, A. (author), De Graaf, G. (author), Wolffenbuttel, R.F. (author)A thermopile-based detector array for use in a miniaturized Infrared (IR) spectrometer has been designed and fabricated using CMOS compatible MEMS technology. The emphasis is on the optimal of the detector array at the system level, while considering the thermal design, the dimensional constraints of a design on a chip and the CMOS compatibility...conference paper 2010
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Wu, M. (author), De Weerdt, M.M. (author), La Poutré, H. (author)In the market of global logistics, agents need to decide upon whether to accept jobs sequentially offered to them. These jobs, which need to be executed in the near future, have different payments and time constraints. In the offering process we study here, an agent (with limited capacity) needs to make an immediate acceptance decision with...conference paper 2011
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- Li, S.B. (author), Xiao, L.O. (author), Song, G.M. (author), Wu, X.M. (author), Sloof, W.G. (author), Van der Zwaag, S. (author) conference paper 2011
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- Sloof, W.G. (author), Li, S. (author), Song, G. (author), Kwakernaak, C. (author), Wu, X. (author), Van der Zwaag, S. (author) conference paper 2011
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- Qiu, J. (author), Van de Ven, M. (author), Molenaar, A. (author), Wu, S. (author), Yu, J. (author) conference paper 2011
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Qiu, J. (author), Molenaar, A.A.A. (author), Van de Ven, M.F.C. (author), Wu, S. (author)It is a well known fact that asphalt mixtures have self healing capabilities. Yet most of the self healing investigations are carried out using complex and time consuming fatigue tests. In order to investigate the self healing capability in a simple and efficient manner, a beam on elastic foundation test setup (BOEF) is proposed in this paper....conference paper 2012
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Xiao, Y. (author), Van de Ven, M.F.C. (author), Wu, S.P. (author), Woldekidan, M.F. (author)Thin surfaces are specially designed to provide significant additional surface properties to pavements without affecting other qualities of the surface such as ride quality and durability. In addition to economic benefits, thin surfaces can protect pavements against deterioration caused by traffic and weather. One of the most important...conference paper 2012
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Qiu, J. (author), Van de Ven, M.F.C. (author), Schlangen, H.E.J.G. (author), Wu, S. (author), Molenaar, A.A.A. (author)The traffic volume and the number of heavy vehicles are growing enormously nowadays. There is a need for designing a durable asphalt pavement with innovative technologies. Pavement structures and materials with self healing and self repairing capability are believed to be very useful in such a system. This paper is aiming to understand the self...conference paper 2012
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- Li, W. (author), Wang, Z.B. (author), Van Maren, D.S. (author), De Vriend, H.J. (author), Wu, B.S. (author) conference paper 2013
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Garcia Espallargas, S.J. (author), Wu, X. (author)Recently, encapsulated silyl esters have been shown to act as efficient healing agents for self-healing anticorrosive coatings. While the positive protective effects were irrefutable, the actual protection mechanism has not been clarified yet. In this study, x-ray computed ?-tomography and electrochemical impedance spectroscopy have been...conference paper 2013
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Prajer, M. (author), Wu, X. (author), Garcia Espallargas, S.J. (author), Van der Zwaag, S. (author)Polymers reinforced with high performance fibres are successfully replacing metal alloys in lightweight aircraft structures. A critical factor in structural design is the resistance of a structure to progressive damage which develops during its service time. The brittle nature of matrix cracking is the main source of composite failure initiating...conference paper 2013