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Filtering by: Advisor Milne, David H. Remove constraint Advisor: Milne, David H. Decade 2010-2019 Remove constraint Decade: 2010-2019

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  • Exploiting Diffraction Orders from a Phase Limited SLM to Remove and Model Zernike Aberrations

    Creator:
    Goschie, Aaron J.
    Abstract:
    Using a plastic bottle, we explore the capabilities of a reflective phase-only Spatial Light Modulator (SLM) in removing wavefront aberrations using a Zernike polynomial phase mask, with the modulators phase depth limited to 0.8π radians. Wavefront aberrations, which can be modeled with Zernike polynomials, distort image transmission through various optical...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    David H. McIntyre submitted to the Department of Physics, Oregon State University in partial

  • The Influence of Nitrogen Fertility on Hop Quality, Pest Management, and the Stability of Biological Control

    Creator:
    Iskra, Anne E.
    Abstract:
    A multi-year field study was conducted in Oregon and Washington to evaluate the influence of nitrogen fertilization rate and timing on cone quality, nitrate accumulation in cones, severity of powdery mildew (caused by Podosphaera macularis), arthropod pests, and the stability of conservation biological control of the twospotted spider mite (Tetranychus...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ David H. Gent A multi-year field study was conducted in Oregon and Washington to

  • Fourier Analysis of Smartphone Call Quality

    Creator:
    Dempsey, Zackery E.
    Abstract:
    In recent decades, the cell phone has provided a convenient form of long-distance communi-cation to the general public. Despite the technological improvements since, cell phones and their smartphone successors have suffered from a lack of clarity over a typical voice call, a result of their limited bandwidth. New phone services,...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    Fourier Analysis of Smartphone Call Quality Zackery Dempsey Advisor: David McIntyre Oregon State

  • Applications of Holographic Optical Tweezers: Multiplexed Fluorescence Spectroscopy and the Micromechanics of Type-I Collagen

    Creator:
    Cibula, Matthew A.
    Abstract:
    The development and some applications of holographic optical tweezers (HOT) are presented. Our HOT system uses a spatial light modulator (SLM) to control the location and properties of the optical trap. We have developed a method for optimizing the diffraction efficiency of a SLM that can be applied in situ...
    Resource Type:
    Dissertation
    Full Text:
    Type-I Collagen Abstract approved: David H. McIntyre The development and some applications of

  • Bandgap measurements of nonspecular materials using a bifurcated fiber optic method of diffuse reflectance

    Creator:
    Wells, Blake
    Abstract:
    A method for determining bandgap energy using diffuse reflection is presented. The method uses bifurcated fiber optic cables to measure the diffuse reflection of diffusely reflective materials. The absorption spectrum is extrapolated from the diffuse reflection spectrum and used to determine the bandgap of powdered materials. The theory of nonspecular...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    Blake Wells Oregon State University Department of Physics Advisor: Dr. David McIntyre 2015

  • Identification and distribution of the mating-type locus and development of cleistothecia of Podosphaera macularis

    Creator:
    Wolfenbarger, Sierra N.
    Abstract:
    Podosphaera macularis, causal agent of hop powdery mildew, is known to produce cleistothecia (syn. chasmothecia) in eastern North America and Europe, but ascocarps are not reported from the Pacific Northwestern region of North America. Reasons for the apparent absence of cleistothecia in the Pacific Northwest are unknown. We established that...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ David H. Gent Podosphaera macularis, causal agent of hop powdery mildew, is known to

  • Optical trapping and acoustical probing of ultrasound contrast agent microbubbles confined in capillaries

    Creator:
    Almaqwashi, Ali
    Abstract:
    In an effort to develop an optical-acoustical understanding of ultrasound contrast agent microbubble dynamics in a micro-environment that resembles blood vessels, this thesis presents experimental work on optical trapping and acoustical probing of ultrasound contrast agent microbubbles confined in regenerated cellulose capillaries. First, we showed by acoustical means that the...
    Resource Type:
    Masters Thesis
    Full Text:
    : _______________________________________ David H. McIntyre In an effort to develop an optical-acoustical understanding of

  • Measurement of optical bandgap energies of semiconductors

    Creator:
    Russell, Joshua A.
    Abstract:
    A method for bandgap energy determination using di use re ection is presented and compared to the traditional integrating sphere method. We have found the bandgap energies of ZnO, TiO₂, Cu₂O, Si, SnZrS₃, SnZrSe₃, Sn₂S₃, and BiCuOSe powders with both methods and found they agree within 0.03 eV. We have...
    Resource Type:
    Masters Thesis
    Full Text:
    Energies of Semiconductors Abstract approved: David H. McIntyre A method for bandgap energy

  • Applied Computing Techniques for Holographic Optical Tweezers

    Creator:
    Gruss, Daniel
    Abstract:
    Optical tweezers are capable of trapping micron sized particles through the transfer of the momentum of light. These capabilities are expanded through the use of computer controlled holograms for beam shaping. This hologram creation is facilitated through the use of a spatial light modulator, which is a liquid crystal device...
    Resource Type:
    Honors College Thesis
    Full Text:
    : _____________________________________________________ David McIntyre Optical tweezers are capable of trapping micron sized particles

  • Determining thickness of zinc sulfide thin films through optical spectroscopy

    Creator:
    Prudell, Kathleen
    Abstract:
    A method has been developed to measure the thickness of ZnS thin films on Si using optical interference. Thin film optical interference fringes are dependent upon the thickness of the film, and for this reason the thickness can be determined by measuring reflectance spectrum of a thin film. A grating...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    of Physics Oregon State University June 1, 2014 Advisors: Dr. Janet Tate and Dr. David