Tunable waveguide Bragg gratings were demonstrated in PYR-3 chromophore doped polymers. We report... more Tunable waveguide Bragg gratings were demonstrated in PYR-3 chromophore doped polymers. We report on the fabrication and the performance of the device. Polycarbonate thin films were doped with PYR-3 (2-{3- Cyano-4- [3-(1-decyl-1 H-pyridin-4-ylidene)-propenyl]-5,5-dimethyi-5 H-furan-2-ylidene}-malononitrile) chromophore, consisting of a dihydropyridinylidene donor and three carbon atoms in the conjugated linker between donor and acceptor. Ridge waveguides were laser micro-machined into the polycarbonate film with a JPSA micromachining system equipped with a KrF excimer laser at 248 nm. Bragg gratings were inscribed into the waveguide by permanently photobleaching the PYR-3 chromophores using a phase mask to achieve narrowband reflections at wavelengths around 1550 nm. Electro-optic properties were introduced by contact poling. Applying a static external electric field leads to the shift of the reflection peak.
This paper reports the development of a polyimide coated fibre Bragg grating for relative humidit... more This paper reports the development of a polyimide coated fibre Bragg grating for relative humidity sensing. The humidity response was measured for several polyimide coatings including P84 and P84 HT. The P84 HT polyimide coating proved the most promising with a large coefficient of moisture expansion measured at 73.8 ppm/%rh. The effect of coating thickness and optical fibre diameter were also investigated.
of a Dissertation Submitted to the Graduate School of The University of Southern Mississippi in P... more of a Dissertation Submitted to the Graduate School of The University of Southern Mississippi in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy
A power tailgate mounting system for a vehicle includes a first gusset member and a second gusset... more A power tailgate mounting system for a vehicle includes a first gusset member and a second gusset member. The first gusset member is secured to an inward side of a roof rail of the vehicle at a rear end portion of the roof rail. The first gusset member has a first gusset tailgate motor mounting portion extending laterally inwardly from the roof rail for mounting an associated tailgate motor. The second gusset member is secured to the inward side of the roof rail at the rear end portion of the roof rail. The second gusset member has a second gusset tailgate mounting portion extending laterally inwardly from the roof rail for mounting the associated tailgate motor. The second gusset tailgate mounting portion overlaps the first gusset tailgate mounting portion.
Personal Reflection Spring 2017 was my first semester of being a research assistant and being a p... more Personal Reflection Spring 2017 was my first semester of being a research assistant and being a part of the INBRE Student Research Experience (SRE) program. Being a part of the INBRE SRE program has allowed me to use the skills I had acquired from the lab classes I have taken previously and it allowed me to gain valuable skills that were not taught in the lab classes. During my semester, I learned numerous techniques organic chemists use and I also learned how to operate various machines critical to our experiments. Not only did I learn techniques and how to operate the machines, but I also developed my communication skills by conversing with lab workers and professors and turning in notebook pages to my supervisor at the end of each lab day. The INBRE SRE program has been a valuable program that has allowed me to blossom into a better scientist.
I'll be performing Frederic Chopin's Scherzo No. 3 in C-Sharp Minor, Op. 39, as one examp... more I'll be performing Frederic Chopin's Scherzo No. 3 in C-Sharp Minor, Op. 39, as one example of the type of music that will be featured in my Senior Recital on April 27. Polish-born Chopin was one of the greatest pianistic innovators of all time, evidenced by this brilliant composition, with fast running octaves and beautiful cascades arpeggios. Chopin wrote this scherzo while living in Majorca with novelist George Sand around 1839. I have done research for several classes on Chopin, particularly his famous polonaises, which were written around the same time. Chopin’s designation of Op. 39 as a “scherzo” (or “joke”) is hard to believe, as it is incredibly virtuosic and beautiful. My wonderful piano teacher, Dr. Lisa Campi, introduced me to the piece because it has long been a favorite of hers. I instantly fell in love with it as well. Dr. Campi's teacher from the Eastman School of Music, Rebecca Penneys, once studied with legendary pianist Arthur Rubinstein, who was known...
.................................................................................................... more .................................................................................................................................. iii CONTENTS ................................................................................................................................... iv FIGURES ...................................................................................................................................... vii TABLES ........................................................................................................................................ ix ABREVIATIONS .......................................................................................................................... x
Optical Measurement Systems for Industrial Inspection X, 2017
Hydrogen evolution, identified by dissolved gas analysis (DGA), is commonly used for fault detect... more Hydrogen evolution, identified by dissolved gas analysis (DGA), is commonly used for fault detection in oil immersed electrical power equipment. Palladium (Pd) is often used as a sensing material due to its high hydrogen absorption capacity and related change in physical properties. Hydrogen is absorbed by Pd causing an expansion of the lattice. The solubility, and therefore lattice expansion, increases with increasing partial pressure of hydrogen and decreasing temperature. As long as a phase change is avoided the expansion is reversible and can be utilized to transfer strain into a sensing element. Fiber Bragg gratings (FBG) are a well-established optical fiber sensor (OFS), mainly used for temperature and strain sensing. A safe, inexpensive, reliable and precise hydrogen sensor can be constructed using an FBG strain sensor to transduce the volumetric expansion of Pd due to hydrogen absorption. This paper reports on the development, and evaluation, of an FBG gas sensing OFS and long term measurements of dissolved hydrogen in transformer mineral oil. We investigate the effects of Pd foil cross-section and strain transfer between foil and fiber on the sensitivity of the OFS. Two types of Pd metal sensors were manufactured using modified Pd foil with 20 and 100 μm thickness. The sensors were tested in transformer oil at 90°C and a hydrogen concentration range from 20- 3200 ppm.
The reductions in the transmission of emission originating from a fluorophore dissolved in a poly... more The reductions in the transmission of emission originating from a fluorophore dissolved in a polymer matrix due to light scattering were compared in two forms of planar waveguides used as luminescent solar concentrators: a thin film of poly(methylmethacrylate) (PMMA) spin-coated on a glass plate and a solid PMMA plate of the same dimensions. The losses attributable to light scattering encountered in the waveguide consisting of the thin film of polymer coated on a glass plate were not detectable within experimental uncertainty, whereas the losses in the solid polymer plate were significant. The losses in the solid plate are interpreted as arising from light-scattering centers comprising minute bubbles of vapor/gas, incomplete polymerization or water clusters that are introduced during or after the thermally induced polymerization process.
Tunable waveguide Bragg gratings were demonstrated in PYR-3 chromophore doped polymers. We report... more Tunable waveguide Bragg gratings were demonstrated in PYR-3 chromophore doped polymers. We report on the fabrication and the performance of the device. Polycarbonate thin films were doped with PYR-3 (2-{3- Cyano-4- [3-(1-decyl-1 H-pyridin-4-ylidene)-propenyl]-5,5-dimethyi-5 H-furan-2-ylidene}-malononitrile) chromophore, consisting of a dihydropyridinylidene donor and three carbon atoms in the conjugated linker between donor and acceptor. Ridge waveguides were laser micro-machined into the polycarbonate film with a JPSA micromachining system equipped with a KrF excimer laser at 248 nm. Bragg gratings were inscribed into the waveguide by permanently photobleaching the PYR-3 chromophores using a phase mask to achieve narrowband reflections at wavelengths around 1550 nm. Electro-optic properties were introduced by contact poling. Applying a static external electric field leads to the shift of the reflection peak.
This paper reports the development of a polyimide coated fibre Bragg grating for relative humidit... more This paper reports the development of a polyimide coated fibre Bragg grating for relative humidity sensing. The humidity response was measured for several polyimide coatings including P84 and P84 HT. The P84 HT polyimide coating proved the most promising with a large coefficient of moisture expansion measured at 73.8 ppm/%rh. The effect of coating thickness and optical fibre diameter were also investigated.
of a Dissertation Submitted to the Graduate School of The University of Southern Mississippi in P... more of a Dissertation Submitted to the Graduate School of The University of Southern Mississippi in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy
A power tailgate mounting system for a vehicle includes a first gusset member and a second gusset... more A power tailgate mounting system for a vehicle includes a first gusset member and a second gusset member. The first gusset member is secured to an inward side of a roof rail of the vehicle at a rear end portion of the roof rail. The first gusset member has a first gusset tailgate motor mounting portion extending laterally inwardly from the roof rail for mounting an associated tailgate motor. The second gusset member is secured to the inward side of the roof rail at the rear end portion of the roof rail. The second gusset member has a second gusset tailgate mounting portion extending laterally inwardly from the roof rail for mounting the associated tailgate motor. The second gusset tailgate mounting portion overlaps the first gusset tailgate mounting portion.
Personal Reflection Spring 2017 was my first semester of being a research assistant and being a p... more Personal Reflection Spring 2017 was my first semester of being a research assistant and being a part of the INBRE Student Research Experience (SRE) program. Being a part of the INBRE SRE program has allowed me to use the skills I had acquired from the lab classes I have taken previously and it allowed me to gain valuable skills that were not taught in the lab classes. During my semester, I learned numerous techniques organic chemists use and I also learned how to operate various machines critical to our experiments. Not only did I learn techniques and how to operate the machines, but I also developed my communication skills by conversing with lab workers and professors and turning in notebook pages to my supervisor at the end of each lab day. The INBRE SRE program has been a valuable program that has allowed me to blossom into a better scientist.
I'll be performing Frederic Chopin's Scherzo No. 3 in C-Sharp Minor, Op. 39, as one examp... more I'll be performing Frederic Chopin's Scherzo No. 3 in C-Sharp Minor, Op. 39, as one example of the type of music that will be featured in my Senior Recital on April 27. Polish-born Chopin was one of the greatest pianistic innovators of all time, evidenced by this brilliant composition, with fast running octaves and beautiful cascades arpeggios. Chopin wrote this scherzo while living in Majorca with novelist George Sand around 1839. I have done research for several classes on Chopin, particularly his famous polonaises, which were written around the same time. Chopin’s designation of Op. 39 as a “scherzo” (or “joke”) is hard to believe, as it is incredibly virtuosic and beautiful. My wonderful piano teacher, Dr. Lisa Campi, introduced me to the piece because it has long been a favorite of hers. I instantly fell in love with it as well. Dr. Campi's teacher from the Eastman School of Music, Rebecca Penneys, once studied with legendary pianist Arthur Rubinstein, who was known...
.................................................................................................... more .................................................................................................................................. iii CONTENTS ................................................................................................................................... iv FIGURES ...................................................................................................................................... vii TABLES ........................................................................................................................................ ix ABREVIATIONS .......................................................................................................................... x
Optical Measurement Systems for Industrial Inspection X, 2017
Hydrogen evolution, identified by dissolved gas analysis (DGA), is commonly used for fault detect... more Hydrogen evolution, identified by dissolved gas analysis (DGA), is commonly used for fault detection in oil immersed electrical power equipment. Palladium (Pd) is often used as a sensing material due to its high hydrogen absorption capacity and related change in physical properties. Hydrogen is absorbed by Pd causing an expansion of the lattice. The solubility, and therefore lattice expansion, increases with increasing partial pressure of hydrogen and decreasing temperature. As long as a phase change is avoided the expansion is reversible and can be utilized to transfer strain into a sensing element. Fiber Bragg gratings (FBG) are a well-established optical fiber sensor (OFS), mainly used for temperature and strain sensing. A safe, inexpensive, reliable and precise hydrogen sensor can be constructed using an FBG strain sensor to transduce the volumetric expansion of Pd due to hydrogen absorption. This paper reports on the development, and evaluation, of an FBG gas sensing OFS and long term measurements of dissolved hydrogen in transformer mineral oil. We investigate the effects of Pd foil cross-section and strain transfer between foil and fiber on the sensitivity of the OFS. Two types of Pd metal sensors were manufactured using modified Pd foil with 20 and 100 μm thickness. The sensors were tested in transformer oil at 90°C and a hydrogen concentration range from 20- 3200 ppm.
The reductions in the transmission of emission originating from a fluorophore dissolved in a poly... more The reductions in the transmission of emission originating from a fluorophore dissolved in a polymer matrix due to light scattering were compared in two forms of planar waveguides used as luminescent solar concentrators: a thin film of poly(methylmethacrylate) (PMMA) spin-coated on a glass plate and a solid PMMA plate of the same dimensions. The losses attributable to light scattering encountered in the waveguide consisting of the thin film of polymer coated on a glass plate were not detectable within experimental uncertainty, whereas the losses in the solid polymer plate were significant. The losses in the solid plate are interpreted as arising from light-scattering centers comprising minute bubbles of vapor/gas, incomplete polymerization or water clusters that are introduced during or after the thermally induced polymerization process.
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