Researcher:
Işıkman, Serhan Ömer

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Master Student

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Serhan Ömer

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Işıkman

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Işıkman, Serhan Ömer

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2006 - 20099

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Researcher Of Publications: search.filters.isAuthorOfPublication.66d561ed-d248-42f5-b936-9a2c44591b11

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Now showing 1 - 9 of 9
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    Modeling and characterization of soft magnetic film actuated 2-D scanners
    (Ieee-Inst Electrical Electronics Engineers Inc, 2007) N/A; N/A; N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; Işıkman, Serhan Ömer; Ergeneman, Olgaç; Yalçınkaya, Arda Deniz; Ürey, Hakan; Master Student; Master Student; Researcher; 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; N/A; N/A; 144523; 8579
    Magnetic behavior of polymer-based scanners is studied in detail with emphasis on a new magnetic actuator model and dc deflection experiments. A 30-mu m-thick permalloy sheet is plated on a polymer cantilever scanner and actuated using an external coil. Mechanical and magnetic modeling of the device and experimental results are presented. Shape anisotropy of the thin, soft magnetic film is explored for push and pull operation in different configurations. A new magnetic actuator model is developed based on the distributed point-by-point calculation of the magnetostatic moments and forces across the film surface. This effort helps one to obtain generic equations for magnetic force and torque without limiting the use of the model to the case where magnetic material is assumed to be fully saturated. Two-dimensional (2-D) scanning utilizing the orthogonal modes of the scanner, using only one actuation coil is presented.
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    Advanced imaging with dynamic focus and extended depth using integrated FR4 platform
    (Optical Society of America (OSA), 2009) Varghese, Samuel; Abdullah, Fahd; Augustine, Robin; Sprague, Randy B.; Andron, Voytek; N/A; Department of Electrical and Electronics Engineering; Işıkman, Serhan Ömer; Ürey, Hakan; Master Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 8579
    A two-degrees-of-freedom scanned beam imaging system with large dynamic range and dynamic focusing is demonstrated. The laser diode, photo-detector and the optical components are integrated on a moving platform that is made of FR4 (Flame-Retardant 4), a common polymeric substrate used in printed circuit boards. A scan angle of 52 degrees is demonstrated at 60Hz resonant frequency while the laser is moved 250um in the out-of-plane direction to achieve dynamic focusing. The laser is scanned by physically rotating the laser diode and the collection optics to achieve high signal-to-noise ratio and good ambient light rejection. The collection optics is engineered such that the collection efficiency decreases when collecting light from close distances to avoid detector saturation. The detection range is extended from contact distance up to 600mm while the collected power level varies only by a factor of 30 within this long range. Slight modifications will allow increasing the detection range up to one meter. This is the first demonstration of a laser scan engine with such a high degree of integration of electronics, optoelectronics, optics and micromechanics on the same platform.
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    FR4 laser scanner with dynamic focus
    (IEEE-Inst Electrical Electronics Engineers Inc, 2009) Sprague, Randy B.; N/A; Department of Electrical and Electronics Engineering; Işıkman, Serhan Ömer; Ürey, Hakan; Master Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 8579
    An electromagnetically actuated optical scanner made using standard printed circuit board technology with integrated dynamic focusing feature is presented. Dynamic focus is achieved with an independently controlled plunger machined on the flame retardant-4 (FR4) platform. Integration of a laser diode and lens, torsional scanner, and the plunger for dynamic focus adjustment on FIN platform greatly improves the form factor of the device for imaging applications. A peak-to-peak mechanical scan angle of 50 degrees is achieved. The dynamic focus control allows for shifting the beam waist location from 80 mm up to 650 mm.
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    Scanning led array based volumetric display
    (IEEE, 2008) N/A; N/A; Department of Electrical and Electronics Engineering; Sayınta, Murat; Işıkman, Serhan Ömer; Ürey, Hakan; PhD Student; 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; N/A; N/A; 8579
    A novel quasi-holographic display concept is developed using Light Emitting Diode (LED) arrays on scanning platform. The display system is capable of providing smooth motion parallax and solving the accommodation -vergence rivalry. Each scanner module contains I D LED array mounted on a polymer scanner with a lens for imaging the LEDs onto a special diffuser screen. The scanning modules are actuated electromagnetically and the LEDs are driven with an external LED driving Field Programmable Gate Array (FPGA) circuitry designed for the purpose. The scanners have a natural frequency of 12.7 Hz, scan line of 21.5 degrees Total Optical Scan Angle (TOSA) and a quality factor of 20. The three dimensional (3D) display concept is proved with two of these modules by displaying two points sequentially at two different depths.
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    FR-4 as a new MOEMS platform
    (Ieee, 2007) N/A; Department of Electrical and Electronics Engineering; Department of Electrical and Electronics Engineering; N/A; N/A; Department of Electrical and Electronics Engineering; Holmstrom, Sven; Yalçınkaya, Arda Deniz; Işıkman, Serhan Ömer; Ataman, Çağlar; Ürey, Hakan; Researcher; Researcher; Master Student; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; College of Engineering; College of Engineering; Graduate School of Sciences and Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 144523; N/A; N/A; 8579
    FR4 is a well-engineered material and widely used in the PCB industry and lend itself to high degree of integration of optoelectronic, micro-optic, and electronic devices. FR4 is used for the first time as an actuated mechanical device that integrates several functions on the same device. Two different approaches to 2D laser scanning using a single electromagnetic actuation coil and application to Fourier Transform spectroscopy are presented; many other applications can be envisioned.
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    Dynamic modeling of soft magnetic film actuated scanners
    (IEEE-Inst Electrical Electronics Engineers Inc, 2009) N/A; N/A; Department of Electrical and Electronics Engineering; Işıkman, Serhan Ömer; Ürey, Hakan; Master Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 8579
    Dynamic behavior of magnetic thin film actuators is investigated in detail and applied to various laser scanning applications. Magnetic hysteresis effects are incorporated into the model developed in the prior work, which assumes linear magnetization as a function of magnetic field and is based on the distributed point-by-point calculation of the magnetostatic moments and forces across the film surface. A simple functional form is used to model the major B-H loop of ferromagnetic films. The model is validated with permalloy (Ni-Fe) plated polymer actuators. The actuators are excited using an external electro-coil and the structures deflect due to magnetic anisotropy torque. The ac deflection of the actuators is modeled by calculating the point-by-point moments on the magnetic film and the solution can handle nonuniform external field and unsaturated magnetic film cases. A 25 degrees optical scan angle is demonstrated for laser scanning display and imaging applications with a nonoptimum coil. Scaling the model to MEMS devices is also discussed.
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    Self-oscillating FR4 laser scanner with integrated dynamic focus and extended imaging range
    (2009) Varghese, Samuel; Sprague, Randy B.; Augustine, Robin; Abdullah, Fahd; Andron, Voytek; N/A; N/A; Department of Electrical and Electronics Engineering; Erden, Erdem; Işıkman, Serhan Ömer; Ürey, Hakan; Master Student; 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; N/A; N/A; 8579
    A self-oscillating scanned beam imaging device is presented, with variable focusing mechanism and extended imaging range. The focusing and imaging optics, as well as the die level laser diode and photodiode are integrated on the same platform, and scanned synchronously to extend the imaging range of the system. More than 600mm imaging range is achieved with 52° total optical scan angle. An integrated back-emf coil both enables the self-starting of the oscillations of the scanner, and also provides the velocity feedback for running the system in closed-loop. A special circuit is implemented to decrease the time to reach 80% of the full amplitude self-oscillations from 970ms down to 60ms. © 2009 IEEE.
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    Dynamic modeling of magnetic film actuators
    (IEEE, 2007) N/A; N/A; Department of Electrical and Electronics Engineering; Işıkman, Serhan Ömer; Ürey, Hakan; Master Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 8579
    Dynamic behavior of magnetic film based actuators is modeled and the model is validated with experiments. An external electro-coil is used to actuate the cantilever scanners, which has an electroplated 30 mum thick permalloy layer. Resonant vibration of the actuator is modeled accurately without constraining the external field to be uniform or the ferromagnetic material to be saturated.
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    PublicationOpen Access
    A MEMS based visible-NIR Fourier transform microspectrometer - art. no. 61860C
    (Society of Photo-optical Instrumentation Engineers (SPIE), 2006) Wolter, A.; Department of Electrical and Electronics Engineering; Ataman, Çağlar; Ürey, Hakan; Işıkman, Serhan Ömer; PhD Student; Faculty Member; Department of Electrical and Electronics Engineering; Graduate School of Sciences and Engineering; College of Engineering; N/A; 8579; N/A
    Design, fabrication and characterization of a novel out-of-plane vertical comb-drive actuator based Fourier transform microspectrometer (FTS) is presented. The spectrometer utilizes resonant mode vertical comb actuators as a variable-depth diffraction grating and a single photodetector to monitor the 0th order of the diffraction pattern. The spectrum of the source illuminating the gratings is computed by Fourier transforming the 0th order intensity as a function of the optical path difference. The vertical comb actuators have a travel range of 100 mu m under atmospheric pressure with 28V excitation, which yields a theoretical spectral resolution of 0.5nm in the visible and better than 5nm in the telecom wavelengths.