The scinti llator response was modeled using MatLab simulations based on fiber optic principles. Health, Silver Spring, MD, Meridional rays only make up a fraction of the light transmitted through the fiber.
T he acceptance angle is shown to be: Diagram illustrating th e acceptance and transmission cone of the scintillating Figure 1 3. The capability of taking linear dose Optical fiber thesis compared to point dose measurements allows for more accuracy in quantifying the organ dose leading t o an improved methodology for determining the effective dose.
Spatial sensitivity of t he 7cm FOC dosimeter Linear fit was applied to the data along with a linear correlation coefficient. This would also result in a longer path length.
We were able to show that the integrated fiber could collect light scattered Optical fiber thesis the surface of ion trap, and hypothesize that the large amount of dielectric present on the surface of the trap may have distorted the trapping potential Optical fiber thesis prevented us from trapping any ions.
Ad ditionally, light that travels at an angle closer to the acceptance angle will undergo more reflections than light propagating parallel to the axis orthogonal to the coupling surface.
PAGE 22 22 Table 1 1. Each detector is capable of measuring one field edg e. These plots are depicted in Figure 2 3, 2 4, 2 5, and 2 6 respectively. Fiber optic working frequency: However, this information has previously been characterized for the point FOC dosimeter and can be Due to the geometry of the elongated scintillating fiber, the normal to axial angular dependence should improve, while the axial dependence will remain unchanged.
This detector was fashioned as a fiber optic coupled dosimeter with a scintillator length on the order of centimeters. That is why it was a critical point to monitor these sensors.
Fiber optic d etection systems offer many benefits that other instrumentation do es not possess such as minimal angular dependence, real time measureme nt capabilities, and small size Cur rently at the University of Florida UF FOC d osimeters have been used to quantify organ dose measurements in anthropomorphic phantoms irradiated by diagnostic imaging x ray beams.
When small lasers and a large grid of possible device locations are used, an exhaustive search for the optimal device location becomes computationally infeasible. We also determined that scatter spots on the surface of the trap are a much bigger problem for fiber optic light collection systems than for traditional bulk optics systems.
The first aim is to investig ate the feasibility of constructing a linear fiber optic d osimete r. In the following years the American company contracted with many telecommunications companies, so starting off experimentation and production of optical fibers all over the world.
The acceptance efficiency is quantified in Equation 1 4 as the ratio of the volume of the acceptance cone to the total solid angle. The reading is recorded and stored.
Optical Fiber Communication Using OptSim Program Info OptiSystem is an optical Optical fiber thesis system simulation package for the design, testing, and optimization of the links between the optical networks. To evaluate all sides of t he x ray to light field alignment, four detectors are placed in the position so that the calibration marker on the detector is aligned with the light field boundary.
Applying a linear fit to the results from Table 1 2, the PAGE 21 21 attenuation per length of scintillator can be expressed as 0. The linearity of the scintillating element, with respect to x ray tube current, was evaluated by increa sing the time current product from 32 to mAs while maintaining the tube potential at kVp.
Figure 3 3 Detector s respons e to x ray beam energy. PAGE 42 42 Figure 2 The two specific effects investigated were attenuation within the scintillating fiber and the geometric coupling of the scintillating PAGE 15 15 and optical fiber surfaces.
Beddar models the collection efficiency of a fiber optic system as shown in E quation 1 2 9 PAGE 16 16 1 2 The last term in Equation 1 2 represents the t ransmission efficiency of the scintillating and transmission fiber accounting for attenuation of light photons inside the fibers due to transmission.
At a specified beam technique, an exposure is delivered to the detector s. It can be parameterized experimentally at different beam energies. The second aim was t o develop and characterize the linear d osimeter to measure average absorbed doses within physical phantoms for diagnostic exposures under kVp.
The readings were normalized and plotted against the measurements from the ion chamber. PDD curves are normalized to the 1. The application of these systems to other areas of research is still mostly undiscovered. Current dosimeters used for in phantom measures chambers, optical stimulated luminescence OSL detectors, and FOC detectors have such small sensitive volumes that they are modeled as point dosimeters Most diagnostic studies expose only parts of the body necessary to image the anatomy critical for mak ing a diagnosis.
The acceptance angle for the plastic o ptical fiber for skew rays is The diameter of the fiber is small enough to avoid the effects of varying intensity across the x ray field caused by the heel effect or any other t ype of non uniform x ray field co nditions One end of the scintillating fiber was coupled to a multi mode transmission optical fiber UV, Polymicro Technologies.
When taking dose measurements with point dosimeters, the dosimet er may be inside or outside the x ray field an d are therefore not representative of the average organ dose.Rather, this thesis tries to realize the great potentials of this material through architectural applications: light-redirecting/imaging, load-bearing, and data transmitting.
Let us imagine a piece of architecture made from optical fiber concrete. Optical Fiber Sensors Thesis (PDF Available) · July with Reads Thesis for: Master of Science in Electronics and Communications Engineering, Advisor: Mahmoud H.
Ahmed and Tarek A. Ramadan. Optical Fiber Communication Using OptSim Program Info OptiSystem is an optical communication system simulation package for the design, testing, and optimization of the links between the optical.
Optical Fiber Communication Thesis Pdf. Master Thesis_final optical fibers might be the best choice, as they are capable of guiding the light in a The block diagram of the fiber-optical communication system is illustrated in. Chapter 1 INTRODUCTION design for such channels is the focus of this dissertation.
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their mitigation in fiber-optic communication systems. analysis of nonlinear effects and their mitigation in fiber-optic communication systems by mahdi malekiha, kaleiseminari.com a thesis mitigation in fiber-optic communication systems author: mahdi malekiha kaleiseminari.com, (electrical engineering).Download