Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 45 for “"fiber optic sensor"”.
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Sapphire Fiber Optic Sensor for High Temperature Measurement
… new technologies for ultra-low-cost sapphire fiber-optic high-temperature sensors. The research is divided into three major parts, the souceless sensor, the simple Fabry-Perot (F-P) interrogator, and the sensor system. Chapter 1 briefly reviews the background of thermal radiation, fiber optic …
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Study of Multimode Extrinsic Fabry-Perot Interferometric Fiber Optic Sensor on Biosensing
… structure. In previous research, a single mode fiber (SMF) sensor system had been investigated for the thin-film measurement due to the high fringe visibility. However, compared with a SMF sensor system, a multimode fiber (MMF) sensor system is lower-cost and has larger sensing area (the fiber …
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Design of a Fiber Optic Sensor Array for in Vitro Monitoring of Cellular Processes
… experience or fatigue. This research proposes a fiber optic based monitoring system as a possible solution to eliminate a number of problems with current cellular data collection methods and to increase the data collection rate tremendously since the process could be automated.
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Detection of fiber fracture in Unidirectional Fiber Reinforced Composites using an In-Plane Fiber Optic Sensor
Fiber reinforced polymers (FRP) are an efficient and inexpensive method of repairing deteriorating infrastructure. FRP sheets can be applied to spalling bridge sections and columns to prevent further deterioration and increase stiffness. However, the effect of the environment on the long-term …
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Active control of flexible structures using fiber optic modal domain sensors
The use of a modal domain fiber optic sensor for vibration control of a flexible cantilevered beam is experimentally demonstrated. The sensor utilizes mode-mode interference in a two mode elliptical core fiber. The sensor covers a major portion of the beam, and produces a measurement based on the …
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Self-Calibrated Interferometric/Intensity Based Fiber Optic Temperature Sensors
… the objective of providing robust and reliable fiber optic temperature sensors capable of operating in harsh environments, a novel type of fiber optic sensor system titled self-calibrated interferometric/intensity-based (SCIIB) fiber optic temperature sensor system is presented in this thesis …
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Applications of optical fiber sensors with thick metal coatings
Over the past decade, fiber optic strain sensors have begun to transition from use in laboratory research to commercial sector applications. This transition is somewhat hindered due to the high cost associated with many optical components required for fiber optic-based sensing systems. Multiplexing …
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Modeling and Testing of Fast Response, Fiber-Optic Temperature Sensors
… was to design, analyze and test a fast response fiber-optic temperature probe and sensor. The sensor is intended for measuring rapid temperature changes such as produced by a blast wave formed by a detonation. This work was performed in coordination with Luna Innovations Incorporated, and the …
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Inverse Problems in Structural Mechanics
… placement optimization of a distributed sensing fiber optic sensor for a smart bed using Genetic Algorithms (GA), where the sensor performance is maximized. The sensing fiber optic cable is represented by a Non-uniform Rational B-Splines (NURBS) curve, which changes the placement of a set of …
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Fiber-optic sensors for weigh-in-motion application
… and possibly further errors. In this thesis, a fiber-optic sensor is proposed which measures the pressure generated by the weight of a vehicle. The system consists of a pneumatic tube filled with an incompressible fluid, a rubber pad embedding the tube, a diaphragm to convert pressure into …
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Intrinsic Fabry-Perot Interferometric Fiber Sensor Based on Ultra-Short Bragg Gratings for Quasi-Distributed Strain and Temperature Measurements
… this task using conventional electrical strain sensors. Fiber optic sensors provide an excellent opportunity to fulfill this need due to their capability to multiplex many sensors along a single fiber cable. Numerous research studies have been conducted in past decades to increase the number of …
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Application of a Fabry-Perot interferometer for measuring machining forces in turning operations
… for detecting changes in machining forces. The fiber optic sensor was able to detect increases in strain corresponding to force increases detected by a dynamometer. The FP interferometer system must progress in several ways. A better data acquisition and data analysis system must be developed. A …
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In-situ cure monitoring and characterization of graphite/epoxy composites using fiber optics and ultrasonics
… fully cured and high-quality composites. In-situ sensors capable of monitoring the change of physical and chemical properties during the cure process are therefore desirable. The major aspects of research in this thesis are as follows: The chemical kinetic and rheological properties of AS4/3501-6 …
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Hardware Design of a Wearable System for Gesture-Based Teleoperation of a Robotic Manipulator
… namely gesture-based control. A review of sensors currently in use for human joint angle measurement is presented. Based on this review, a method was chosen that uses a variable-length fiber optic sensor. Several different types of optical fibers, along with a variety of test …
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Production of controlled networks and morphologies in toughened thermosetting resins using real-time, in-situ cure monitoring
… a need for the development of in-situ real-time sensors to follow these changes. Once these sensors are developed, they can be used to preferentially select networks and/or morphologies by feedback-controlled "intelligent" processing. A practical, durable, inexpensive Fourier Transform …
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Miniature Fiber Optic Viscoelasticity Sensor for Composite Cure Monitoring
… while improving their reliability is the use of sensors during processing to permit control of the cure cycle based on measurements of the material's internal state. While sensors have been demonstrated that infer the material state indirectly through measurements of acoustic impedance, …
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Chemical sensing applications of fiber optics
… of this research is the implementation of a fiber optic sensor to measure refractive indices of unknown solutions. The surface plasmon sensor, interrogated with white light resulted in attenuations of light at different wavelengths when solutions of different refractive indices were …
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Extrinsic Fabry-Perot Interferometric hydrogen gas sensor
… technologies to create resistive-based sensors which are impractical for many applications requiring electrical isolation or operation in the presence of strong electromagnetic fields. Materials can be sputter deposited along cylindrical optical fiber-based sensors to create novel …
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On-line evaluation of mode field distribution in optical fibers
… over the years due to its immense value both in fiber-optic sensor technology and communication systems. This presentation is aimed at reviewing the research done in that area so far and at describing a data acquisition system that can be used extensively for such analysis. This work primarily …
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An optic fiber sensor for partial discharge acoustic detection
… are consistent with theoretical expectations. Fiber optic-based sensors have been shown to be attractive devices for PD detection because of a number of inherent advantages including small size, high sensitivity, electrical nonconductivity, and immunity to electromagnetic interference (EMI). A …
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