Researcher:
Hatipoğlu, Gökhan

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Master Student

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Gökhan

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Hatipoğlu

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Hatipoğlu, Gökhan

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Now showing 1 - 3 of 3
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    Publication
    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; 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; 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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    Publication
    FR4-based electromagnetic energy harvester for wireless sensor nodes
    (IOP Publishing Ltd, 2010) N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Hatipoğlu, Gökhan; Ürey, Hakan; Master Student; Faculty Member; Graduate School of Sciences and Engineering; College of Engineering; N/A; 8579
    Electromagnetic (EM) energy harvesting seems to be one of the most promising ways to power wireless sensors in a wireless sensor network. In this paper, FR4, the most commonly used PCB material, is utilized as a mechanical vibrating structure for EM energy harvesting for body-worn sensors and intelligent tire sensors, which involve impact loadings. FR4 can be a better material for such applications compared to silicon MEMS devices due to lower stiffness and broadband response. In order to demonstrate FR4 performance and broadband response, three moving magnet type EM generator designs are developed and investigated throughout the paper. A velocity-damped harvester simulation model is first developed, including a detailed magnetic model and the magnetic damping effects. The numerical results agree well with the experimental results. Human running acceleration at the hip area that is obtained experimentally is simulated in order to demonstrate system performance, which results in a scavenged power of about 40 mu W with 15 m s(-2) acceleration input. The designed FR4 energy scavengers with mechanical stoppers implemented are particularly well suited for nearly periodic and non-sinusoidal high-g excitations with rich harmonic content. For the intelligent tire applications, a special compact FR4 scavenger is designed that is able to withstand large shocks and vibrations due to mechanical shock stoppers built into the structure. Using our design, 0.4 mW power across a load resistance at off-resonance operation is obtained in shaker experiments. In the actual operation, the tangential accelerations as a result of the tire-road contact are estimated to supply power around 1 mW with our design, which is sufficient for powering wireless tire sensors. The normalized power density (NPD) of the designed actuators compares favorably with most actuators reported in the literature.
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    PublicationOpen Access
    FR4-based electromagnetic energy harvester for wireless tyre sensor nodes
    (Elsevier, 2009) Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Hatipoğlu, Gökhan; Ürey, Hakan; Faculty Member; College of Engineering; N/A; 8579
    An electromagnetic (EM) power generator having 46 Hz resonance frequency is designed to scavenge mechanical vibrations occurring in tyres due to lyre-road contact. The major innovation is the use of FR4 as a structural spring material as well as utilizing a spacer and stopper mechanism increasing the shock resistance by limiting the maximum deflection. The novel magnet assembly and spacer design provide high power density. The tangential acceleration waveforms of typical tyre rotation is used as an input in the experiments and 0.4 mW power is obtained over a 100 Omega load resistance for 15g peak-to-peak amplitude at 22,83 Hz, corresponding to about 150 kph vehicle speed. Maximum acceleration is limited with the shaker, larger power values are expected in actual operation. The performance is obtained off-resonance and superior to resonant Silicon MEMS based scavengers.