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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 23 for “"fiber optic sensing"”.
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Sapphire Based Fiber-Optic Sensing for Extreme High Temperatures
Temperature sensing is one of the most common and needed sensing technique, especially in harsh environment like a coal gasifier or an airplane engine. Single crystal sapphire has been studied in the last two decades as a candidate for harsh environment sensing task, due to its excellent mechanical …
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Subsurface damage detection using a novel fiber optic sensing technique
… for monitoring large scale systems. The novel fiber optic based technique developed in this research overcomes many of the limitations of traditional non-destructive evaluation methods by providing an interferometric sensing technique coupled with a simple mechanical test. The method is based …
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Fiber Optic Sensing of Strain and Temperature for Structures in a Hypersonic Flow
Research into multi-sensor fiber Bragg grating (FBG) networks has the potential to benefit aircrafthealth monitoring systems. The overall goal of this thesis research is to demonstrate that FBG sensors can be used to measure temperature and strain data of a structure in a hypersonic flow. To that …
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Enhanced completion evaluations in unconventional reservoirs: new applications of fiber optic sensing and machine learning
… in the Chalk Bluff field and equipped with fiber optic sensing technology to evaluate the completion effectiveness at each stage. The primary goal of these wells was to determine the optimal completion strategies in the field and the impact of nearby legacy wells. In recent years, fiber …
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Sapphire optical fiber sensors
Fiber optic sensors offer many advantages over conventional sensors, including; small size, low weight, high strength and durability. Standard silica optical fibers are limited by the material properties of silica. Temperatures above 700°C and other harsh environments are incompatible with standard …
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Development of a Miniature, Semi-Distributed Sapphire Fiber Optic Thermometer for Harsh and High Temperature Environments
Fiber optic temperature sensing has become a well-defined field in the past few decades [1] through the use of Fiber Bragg Gratings, Fabry-Perot interferometry, and pyrometry, to list several techniques in use today. The use of fiber optics offers significant advantages over electronic sensing in …
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Fiber optic techniques for remote sensing
… noise immunity has prompted the development of sensing systems based on optical fiber technology. This presentation opens with a short review of fiber optic sensing methods, including a discussion of several devices developed in prominent laboratories. The theoretical and empirical results of a …
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Improving Separation of Signals from Multiple Physical Quantities Detected by Sensor Arrays
Modern array sensing systems, such as distributed fiber optic sensing, are used in many applications which may record a mixture of responses to multiple physical quantities. In these applications, it may be helpful to be able to separate this mixture of responses into the signals resulting from the …
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Development of a Miniature, Fiber-optic Temperature Compensated Pressure Sensor
… the invention of Laser (in 1960) and low loss optical fiber (in 1966) [1], extensive research in fiber-optic sensing technology has made it a well-defined and matured field [1]. The measurement of physical parameters (such as temperature and pressure) in extremely harsh environment is one of …
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The study of acoustic properties of P205-doped silica fiber
Silica-based optical fibers have been applied to numerous fields. The interactions between acoustic phonons and the optical wave are involved in several of these applications. A significant stimulated scattering mechanism observed is stimulated Brillouin scattering (SBS), resulting in strong …
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Miniature Fiber-Optic Sensors for High-Temperature Harsh Environments
… beyond 600°C for today's large engines. Current fiber-optic sensor can operate up to about 300°C and even the most widely employed semiconductor sensors are limited below 500°C. The objective of this research is to push the limit of fiber-optic sensing technology in harsh environment applications …
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Landslide-pipeline interaction for onshore slopes in silty sand
… and soil strain, making use of a high-definition fiber optic sensing to capture the strain every 2.6 mm at model scale. Imaging technology was developed for use in a geotechnical centrifuge, including single board computers (Raspberry Pi). Twelve of these cameras were used to capture the …
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Synthesis and characterization of geopolymers for infrastructural applications
… health monitoring. A distributed geopolymer-fiber optic sensing (G-FOS) system was proposed, where metakaolin-based geopolymers are used as smart adhesives to affix optical fibers to existing in-service structures to form the integrated G-FOS sensor for infrastructure health monitoring. The …
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Design, Fabrication and Calibration of Compliant, Multi-Axis, Fiber-Optic Force/Torque Sensors for Biomechanical Measurements
… compliant force and torque sensors based on fiber-optic sensing technology, the novel calibration methodologies and the experimental results. A compliant 3-axis, intensity modulated-based, fiber-optic force sensor that simultaneously measures normal and shear forces was designed, prototyped …
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Fiber-Optic Sensors for Fully-Distributed Physical, Chemical and Biological Measurement
Distributed sensing is highly desirable in a wide range of civil, industrial and military applications. The current technologies for distributed sensing are mainly based on the detection of optical signals resulted from different elastic or non-elastic light-matter interactions including Rayleigh, …
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Two Innovative Applications Combining Fiber Optics and High Power Pulsed Laser: Active Ultrasonic Based Structural Health Monitoring and Guided Laser Micromachining
This dissertation presents the exploration of two fiber optics techniques involving high power pulse laser delivery. The first research topic is "Embedded Active Fiber Optic Sensing Network for Structural Health Monitoring in Harsh Environments", which uses the fiber delivered pulse laser for …
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Multicomputer networks for smart structures
… number of communication links, and the length of fiber required to embed the network in the structure. The performance measures are the algorithm cycle time and the mean and standard deviation of message latency in the network. The scalability of these metrics is also examined. A key issue in the …
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Abrasive Blasting with Post-Process and In-Situ Characterization
… operators. Furthermore, the feasibility of fiber optic sensing technologies was investigated as potential tools to provide real time feedback to the blast machine operator in terms of substrate temperature. Decreasing the blast distance from 6” to 4” led to ΔT = +9.2 °C, while decreasing the …
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Development of Random Hole Optical Fiber and Crucible Technique Optical Fibers
… reports the development of two new categories of optical fibers. These are the Random Hole Optical Fiber (RHOF) and the Crucible Technique Hybrid Fiber (CTF). The RHOF is a new class of microstructure fiber which possesses air holes which vary in diameter and location along the length of the …
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Challenges of geophysical processes and interpretation of an unconventional play: a case study from Wattenberg field, Denver-Julesburg Basin, Colorado, The
… including seismic, borehole logs, distributed fiber optic sensing data, microseismic, and production. Relevant research findings were compared and if applicable were linked to other project data from larger regional analyses to enhance the characterization of the Niobrara-Codell petroleum …
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