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Development of a portable system for the detection of the microorganisms in meat product
(2015) Durmaz, Çağatay
This thesis is related to a part of the Ministry of Science, Industry and Technology (MOSIT)'s Industry Thesis (SANTEZ) Program. The specific project number given by MOSIT to the project is 00973.STZ.2011-2. In the thesis, as a part of a Project group, I participated in all the activities of design and development of a new portable device that can detect and identify the food poisoning in a very short time, accurately, and reliably. The research Project Group consisted of the Project Coordinator Prof. Dr. Taner ALTUNOK, who was responsible for the management of the Project and technically all the aspects of the Project, Engin KIRAN, from IDC Company for electronic design and software, Onur ÖÇALAN and Melike AYTÜRK, from IDC company, for software development, and Gamze YAVAŞ and Cansu ÖZDEMİR, from IDC, are the biology experts. My main responsibility was to support the electronic and software design. I developed the image processor software used to identify the bacteria that cause the food poisoning in the images taken by a camera. The device, Biosensor System, was designed, developed and tested by the Project Group successfully. Thus, the SANTEZ Project was successfully completed and was tested and accepted by the MOSIT. The Biosensor System developed within the scope of the SANTEZ Project has extra capabilities to the devices available on the market. The image processing method we developed takes the image of a well where a chemical reaction had taken place by introducing an antigen into the food samples before. When the chemical reaction takes place between the food under test and the antigen in the well, some photons are emitted through the chemiluminescence mechanism. The irradiation intensities of the pixels in the image of the well were measured by an electron-multiplying charge-coupled device (EMCCD) camera. Our method defines the area of the wells identified by a mask, and then calculates the average intensity of all the intensity values belonging to pixels in the well image. A detection of the harmful microorganisms is made if the average intensity pertaining to the well exceeds a limit. A decision indicating a positive detection and identification of the harmful microorganism is made if this average intensity exceeds a threshold value determined
Design and implementation of a 1kw single phase grid tie inverter
(2013) Şimşek, Oğuz
Renewable energy sources and their power processing equipments are gaining increasing importance in the market. Excess of energy harvested from a renewable source is either stored for future use or sold to other users that are in need of electrical energy at the time of harvesting. Since storage of excess energy is an ine fficient and costly process, a better way of dealing with excess energy is to transfer the energy to the interconnected power grid by means of appropriate power processing. In this thesis work, design and implementation of a high e - fficiency power processing equipment known as Grid Tie Inverter (GTI) to achieve energy transfer to the grid is studied. The target of this study is to convert low voltage direct current (DC) electrical energy harvested from the photo voltaic (PV) panels to high voltage alternating current (AC). The magnitude and phase of the processed alternating current is then controlled in a way such that the power ows towards the grid with a low DC and low reactive component. To achieve this goal, the voltage of the PV panels is stepped up to an appropriate DC link voltage by using a boost type converter known as the Z-Source. The required DC analysis and transfer functions iv of the Z-Source converter are obtained by the circuit averaging technique and a proportional-integral (PI) regulator is designed and implemented to stabilize the DC link voltage. The stabilized DC link voltage is then converted to alternating current using a full bridge inverter. The required grid voltage and phase information is obtained by digital implementation of a single phase time-delay based synchronous reference frame phase locked loop circuit (TDB-SRF PLL). The control of the current owing into the grid is carried out by using the D-Q synchronous reference frame approach. Hereby, the direct (D) and quadrature (Q) components of the grid current are calculated using Park's transformation. The magnitudes of the D and Q components are stabilized by separate digital PI controllers. The outputs of the PI controllers are then converted back to the rotating reference frame using the inverse Park's transformation. The output of the transformation is used as a control signal to drive the full bridge inverter. The scope of the thesis comprises both the modeling and simulation of the GTI components and the design and implementation of a prototype GTI. A thorough experimental evaluation con rms the practicability of the proposed design
Wireless optical wave propagation in underwater medium
(2013) Keskin, Aysan
In this thesis, the effects of the turbulence on the average transmittance are examined when the lowest order collimated Gaussian optical beam wave propagates in a wireless underwater medium. To observe the oceanic turbulence effect, the power spectrum of homogeneous and isotropic oceanic water combining the effects of salinity and temperature is used. Employing the Rytov method and the numeric integration, the effects of the parameters of power spectrum on the average transmittance are analyzed. Obtaining results with the help of Matlab program indicates that the rate of dissipation of the kinetic energy per unit mass of fluid is directly proportional to the average transmittance while the rate of dissipation of the mean-squared temperature is inversely proportional to the average transmittance. Increase in the link distance and decrease in the wavelength reduce the average transmittance. When the temperature-induced optical turbulence is dominant in the ratio of the salinity and temperature contributions to the refractive index spectrum, the average transmittance almost never decreases. However, the salinity-induced optical turbulence reduces the average transmittance sharply. Increasing the Kolmogorov microscale length, first the turbulence effect increases and the average transmittance decreases, but when the value of Kolmogorov microscale is further increased, the turbulence effect starts to decrease and the average transmittance increases, eventually a saturation is observed

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