Researcher:
Ölçer, Selim

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Selim

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Ölçer

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Ölçer, Selim

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2009 - 200912010 - 202015

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Researcher Of Publications: search.filters.isAuthorOfPublication.09472ffb-d3b2-4cd2-a411-e9d7ee75340f

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Now showing 1 - 10 of 16
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    Light engine and optics for HELIUM3D auto-stereoscopic laser scanning display
    (IEEE, 2011) Willman, Eero; Baghsiahi, Hadi; Day, Sally E.; Selviah, David R.; Fernandez, F. Anibal; N/A; Department of Electrical and Electronics Engineering; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Akşit, Kaan; Ölçer, Selim; Erden, Erdem; Chellappan, Kishore Velichappattu; Ürey, Hakan; PhD Student; Other; Master Student; Researcher; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; N/A; N/A; N/A; N/A; 8579
    This paper presents a laser-based auto-stereoscopic 3D display technique and a prototype utilizing a dual projector light engine. The solution described is able to form dynamic exit pupils under the control of a multi-user head-tracker. A prototype completed recently is able to provide a glasses-free solution for a single user at a fixed position. At the end of the prototyping phase it is expected to enable a multiple user interface with an integration of the pupil tracker and the spatial light modulator.
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    Design and characterization of micromachined sensor array integrated with CMOS based optical readout
    (Elsevier Science Sa, 2014) Temiz, Yüksel; Leblebici, Yusuf; Torun, Hamdi; N/A; N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Erarslan, Refik Burak; Adiyan, Ulaş; Lüleç, Sevil Zeynep; Ölçer, Selim; Ürey, Hakan; Other; PhD Student; Master Student; Other; Faculty Member; Department of Electrical and Electronics Engineering; N/A; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; N/A; N/A; N/A; N/A; 8579
    This paper reports a micro electro-mechanical system (MEMS) based sensor array integrated with CMOSbased optical readout. The integrated architecture has several unique features. MEMS devices are passive and there are no electrical connections to the MEMS sensor array. Thus, the architecture is scalable to large array formats for parallel measurement applications and can even be made as a disposable cartridge in the future using self-aligning features. A CMOS-based readout integrated circuit (ROIC) is integrated to the MEMS chip. Via holes are defined on ROIC by customized post-processing and MEMS chip is thinned down by a grinding process to enable integrated optical readout. A diffraction grating interferometerbased optical readout is realized by pixel-level illumination of the MEMS chip through the via holes and by capturing the reflected light using a photodetector array on the CMOS chip. A model for the optical readout principle has been developed using Fourier optics. (C) 2013 Elsevier B.V. All rights reserved.
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    MEMS sensor array platform integrated with CMOS based optical readout
    (Institute of Electrical and Electronics Engineers (IEEE), 2013) Temiz, Yuksel; Leblebici, Yusuf; Torun, Hamdi; N/A; N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Erarslan, Refik Burak; Lüleç, Sevil Zeynep; Adiyan, Ulaş; Ölçer, Selim; Ürey, Hakan; Other; Master Srudent; PhD Student; Other; Faculty Member; Department of Electrical and Electronics Engineering; N/A; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; N/A; N/A; N/A; N/A; 8579
    This paper reports a micro electro-mechanical system (MEMS) based sensor array integrated with CMOS-based optical readout. The integrated architecture has several unique features and reported here for the first time. MEMS devices are passive and there are no electrical connections to the MEMS sensor array. Thus the architecture is scalable to large array formats for parallel measurement applications and can even be made as a disposable cartridge in the future using self-aligning features. A CMOS-based readout integrated circuit (ROIC) is integrated to the MEMS chip. Via holes are defined on ROIC by customized post-processing to enable integrated optical readout. A diffraction grating interferometer-based optical readout is realized by pixel-level illumination of the MEMS chip through the via holes and by capturing the reflected light using a photodetector array on the CMOS chip.
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    Miniaturized FR4 spectrometers
    (Ieee, 2009) N/A; N/A; N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; N/A; Department of Electrical and Electronics Engineering; Seren, Hüseyin Rahmi; Ferhanoğlu, Onur; Hatipoğlu, Gökhan; Boyman, Mişel; Ölçer, Selim; Ataman, Çağlar; Ürey, Hakan; Master Student; PhD Student; Master Student; Undergraduate Student; Other; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 205198; N/A; N/A; N/A; N/A; 8579
    A miniaturized and electromagnetically driven FR4 based moving platform is developed for Fourier Transform spectrometer applications. Both Michelson interferometer and Lamellar Grating interferometer configurations are demonstrated. +/- 500 mu m translational motion (corresponding to 5 cm(-1) spectral resolution) is demonstrated with the moving platform. Two methods are proposed and partially demonstrated for pure translational motion: (I) integrated control system using a quad photo detector feedback and (2) corner cube retroreflector. The fundamental advantages and the limits of the lamellar grating interferometers are also discussed.
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    High-speed broadband FTIR system using MEMS
    (Optical Soc Amer, 2014) Stehle, Jean-Louis; N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; N/A; Department of Electrical and Electronics Engineering; Ayerden, Nadire Pelin; Aygün, Uğur; Holmstrom, Sven; Ölçer, Selim; Can, Başarbatu; Ürey, Hakan; Master Student; PhD Student; Researcher; Other; Master Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; N/A; N/A; N/A; 8579
    Current Fourier transform infrared spectroscopy (FTIR) systems have very good spectral resolution, but are bulky, sensitive to vibrations, and slow. We developed a new FTIR system using a microelectromechanical system (MEMS)-based lamellar grating interferometer that is fast, compact, and achromatic (i.e., does not require a beam splitter). The MEMS device has > 10 mm(2) active surface area, up to +/- 325 mu m mechanical displacement, and a 343 Hz resonant operation frequency. The system uses a 5 MHz bandwidth custom infrared (IR) detector and a small emission area custom blackbody source to achieve fast interferogram acquisition and compact form factor. Effects of lamellar grating period, detector size, laser reference, apodization, and averaging of data on the spectral resolution are discussed. The measurement time ranges from 1.5 to 100 ms depending on the averaging time. In the target range of 2.5-16 mu m (625- 4000 cm(-1)) a spectral resolution of 15-20 cm(-1) is demonstrated. The measurements are shown to be stable over a long time. (C) 2014 Optical Society of America
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    MEMS fourier transform IR spectrometer
    (IEEE, 2011) Sandner, Thilo; Luettjohann, Stephan; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; N/A; Department of Electrical and Electronics Engineering; N/A; Ürey, Hakan; Holmstrom, Sven; Ölçer, Selim; Seren, Hüseyin Rahmi; Sharma, Jaibir; Ayerden, Nadire Pelin; Faculty Member; Researcher; Other; Master Student; Researcher; Master Student; Department of Electrical and Electronics Engineering; College of Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; College of Engineering; Graduate School of Sciences and Engineering; 8579; N/A; N/A; N/A; N/A; N/A
    A comb-actuated MEMS lamellar grating FTIR spectrometer with maximum OPD of 652μm and clear aperture area of 9.6mm2 is developed. Laser and IR interferograms in 2.5-16μm wavelength band are acquired at ambient pressure.
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    Beam forming for a laser based auto-stereoscopic multi-viewer display
    (Digest, 2011) Baghsiahi, Hadi; Selviah, David R.; Willman, Eero; Fernández, Anibal; Day, Sally E.; Surman, Phil A.; N/A; N/A; Department of Electrical and Electronics Engineering; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Akşit, Kaan; Ölçer, Selim; Mostafazadeh, Aref; Erden, Erdem; Chellappan, Kishore Velichappattu; Ürey, Hakan; PhD Student; Other; Researcher; Master Student; Researcher; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; N/A; College of Engineering; N/A; N/A; N/A; N/A; N/A; 8579
    An auto-stereoscopic back projection display using a RGB multi-emitter laser illumination source and micro-optics to provide a wider view is described. The laser optical properties and the speckle due to the optical system configuration and its diffusers are characterised.
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    FR4 electromagnetic scanner based fourier transform spectrometer
    (ASME, 2011) Department of Electrical and Electronics Engineering; N/A; Department of Electrical and Electronics Engineering; N/A; Ürey, Hakan; Baran, Utku; Ölçer, Selim; Hedili, M. Kıvanç; Faculty Member; Master Student; Other; Master Student; Department of Electrical and Electronics Engineering; College of Engineering; Graduate School of Sciences and Engineering; College of Engineering; Graduate School of Sciences and Engineering; 8579; N/A; N/A; N/A
    Fourier transform spectrometers require an interferometric optical setup, where a precisely controlled motion of a mirror on a moving stage and a reference mirror are required. FR4, a common printed circuit board substrate, and the standard PCB technology is used to develop a simple gimbaled scanner structure with high precision to implement into a low-cost and viable Fourier Transform Spectrometer. On top of the corner cube reflector based tilt-insensitive setup, magnetic actuation optimization using twin opposing magnets solution is found to be helpful to enhance interference data. Large Lorentz force is generated for out-ofplane deflection while the torsional motion of the scanner is restricted. ±162.8um out-ofplane translation at 149 Hz resonance is realized with torsion effect deteriorated result which corresponds to <1nm spectral resolution at visible wavelengths.
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    48.4: Beam forming for a laser based auto-stereoscopic multi-viewer display
    (Blackwell Publishing Ltd, 2011) Baghsiahi, Hadi; Selviah, David R.; Willman, Eero; Fernández, Anibal; Day, Sally E.; Surman, Phil A.; N/A; Department of Electrical and Electronics Engineering; N/A; N/A; N/A; Department of Electrical and Electronics Engineering; Akşit, Kaan; Ölçer, Selim; Mostafazadeh, Aref; Erden, Erdem; Chellappan, Kishore Velichappattu; Ürey, Hakan; PhD Student; Other; N/A; Other; N/A; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; N/A; N/A; College of Engineering; N/A; N/A; N/A; N/A; N/A; 8579
    An auto-stereoscopic back projection display using a RGB multiemitter laser illumination source and micro-optics to provide a wider view is described. The laser optical properties and the speckle due to the optical system configuration and its diffusers are characterised. © 2011 SID.
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    Modular multi-projection multi-view autostereoscopic display using MEMS laser projectors
    (Blackwell Publishing, 2014) N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Akşit, Kaan; Ölçer, Selim; Ürey, Hakan; PhD Student; Other; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; College of Engineering; N/A; N/A; 8579
    A new modular multi-projection multi-user multiview autostereoscopic display structure based on microelectromechanical systems (MEMS) laser projectors is presented. The system contains an array of MEMS laser projectors, a vertical diffuser, and the driving electronics. Each projector provides a slit of the whole image observed through the vertical diffuser. The structure does not require super position of the content among the projectors. Unlike similar type of displays, the size of the projection display hardware decreased dramatically. The structure has the capability to provide horizontal expansion in the screen size, and in number of different perspectives shown. Mentioned capabilities can be enhanced by using more projectors, by increasing the distance between projectors and the screen, and by changing the diffusion angle of the vertical diffuser in the minor axis. The inhouse built prototype with 18 projectors displays an image with a resolution of 234times848, and 36 different perspectives. The size of the image at the screen is 16 cm x 72 cm.