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 9 of 9 for “"OFDR"”.
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Structural Monitoring With Fiber Bragg Grating Strain Sensor Array and Optical Frequency Domain Reflectometry
… Optical Frequency Domain Reflectometry (C-OFDR) to interrogate Fiber Bragg Grating Arrays (FBGA) have shown promise in its use in infrastructure health monitoring systems. In this work, the modeling, design, simulation, fabrication, calibration, and testing of a three-element, 15.3 cm fiber …
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Spatiotemporal Temperature and Concentration Measurements in a Monolith Reactor
… optical frequency domain reflectometry (c-OFDR). This technique enables instant temperature measurement along a fiber with high spatial and temporal resolutions. The objectives of my works are: i) illustrate the capability of the c-OFDR method to measure transient temperature inside the …
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An optical smart needle : point-of-care technologies for integrated needle guidance using optical frequency domain ranging
… a human hair. Optical frequency domain ranging (OFDR) is an optical ranging technique that is capable of measuring depth-resolved (axial, z) tissue structure, birefringence, flow (Doppler shift), and spectra at a micrometer level resolution. Analysis of the OFDR depth reflectivity profiles yields …
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Distributed Vibration Sensing using Rayleigh Backscatter in Optical Fibers
… of the Optical Frequency Domain Reflectometry (OFDR). This work focuses on using OFDR as a means of obtaining distributed vibration measurements using the Rayleigh scatter along a single-mode optical fiber. The effort begins by discussing various distributed measurement techniques currently in …
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High Resolution Distributed Sensing Using Exposed-Core Fibres
… Based on optical frequency domain reflectometry (OFDR), this thesis extends distributed sensing to biomedical applications, with a focus on the detection of small particles. A high-resolution distributed sensing method has been proposed, in which an exposed-core fibre (ECF) is used to detect …
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A Quasi-distributed Sensing Network Based on Wavelength-Scanning Time-division Multiplexed Fiber Bragg Gratings
… using optical frequency domain reflectometry (OFDR), whose maximum fiber span is limited by the coherence length of light source. In this work, we proposed and demonstrated a wavelength-scanning time-division multiplexing (WSTDM) of 1000 ultra-weak FBGs for distributed temperature sensing. In …
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Evaluation of the Flexural Response of Steel Reinforced UHP-FRC Beams Using Distributed Sensing
… based on optical frequency domain reflectometry (OFDR), offer new insights. In our study, DFOS and strain gauges monitored strains along longitudinal reinforcement and support wire during four-point loading tests on beams with varying fibre contents (1% and 3%) and reinforcement ratios (1.5% and …
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Development of "Core-Suction" Technique for Fabrication of Highly Doped Fibers for Optical Amplification and Characterization of Optical Fibers for Raman Amplification
… an optical frequency domain reflectometery (OFDR) technique. Commercial dispersion compensated fiber (DCF) with very high GeO2 doping was used to setup a Raman amplifier and the gain spectrum measured. One of the needs of Raman amplification in optical fibers is to predict an accurate Raman …
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Optical Frequency Domain Reflectometry Based Quasi-distributed High Temperature Sensor
… An optical frequency domain reflectometry (OFDR) based multiplexed technique is applied in the sensor design to realize temperature measurement at multiple locations along the optical path. In this work, three sapphire wafers based multiplexed temperature sensor is fabricated and calibrated …