A5024969676- Luminescence Properties of Advanced Materials
- Advanced Sensor Technologies Research
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Thermography and Photoacoustic Techniques
- Gas Sensing Nanomaterials and Sensors
- Transport Systems and Technology
- solar cell performance optimization
- Advanced Measurement and Detection Methods
- Catalytic Processes in Materials Science
- Combustion and flame dynamics
- Atmospheric Ozone and Climate
- Advanced Semiconductor Detectors and Materials
- Sensor Technology and Measurement Systems
- Chemical Thermodynamics and Molecular Structure
- Particle accelerators and beam dynamics
- Solar Thermal and Photovoltaic Systems
- Transportation Safety and Impact Analysis
- Impact of Light on Environment and Health
- Muon and positron interactions and applications
- Metallurgical Processes and Thermodynamics
- Spacecraft Design and Technology
- Superconducting Materials and Applications
- Particle Detector Development and Performance
- Rocket and propulsion systems research
Integrated Statistics (United States)
2019
Williams (United States)
2016
Knoxville College
1999-2011
Oak Ridge National Laboratory
1996-2007
National Technical Information Service
2006
Office of Scientific and Technical Information
2006
University of Tennessee at Knoxville
2006
Martin Marietta Materials (United States)
1990-2003
Brookhaven National Laboratory
2002
Los Alamos National Laboratory
1991
Remote-temperature sensing using thermal phosphors is being developed as a nonintrusive technique for monitoring and analyzing the high-temperature, highly corrosive environments of turbomachinery. Proof-of-principle tests were conducted on phosphor-coated turbine blades that rotating at low speeds immersed in jet fuel flame. A pulsed nitrogen laser produced fluorescence from applied phosphor. simple optical scheme collected this emission, digital oscilloscope extracted signal...
Reported here are measurements aimed at development of high temperature luminescence-based fibre optic thermometry for temperatures up to least 1700 °C. Cylindrical crystal samples YAG:Dy(1%) and YAG:Dy(1.5%),Er(0.5%) were fabricated by the co-precipitation method. The optical system was comprised Nd:YAG 355 nm laser light injected into one leg flexible bifurcated connected a sapphire pipe. input end is water cooled sensing inside furnace in proximity crystal. emission originates from Dy3+...
We report initial results of exposing low-Z solid and high-Z liquid targets to 150-ns, 4/spl times/10/sup 12/ proton pulses with spot sizes on the order 1 2 mm. The energy deposition density approached 100 J/g. Diagnostics included fiberoptic strain sensors target high-speed photography targets. This work is part R&D program Neutrino Factory Muon Collider Collaboration.
The temperature dependence of the lifetimes two phosphors, La2O2S:Eu and Mg4FGeO6:Mn, is presented from 300 to 11 140 8 K, respectively. Emission D35 state reveals a strong about 130 where signal becomes too weak measure accurately. F24 Mg4FGeO6:Mn changes throughout range measured. Both these materials are used for higher thermometry applications. This work illustrates their utility down liquid helium temperatures.
Fluorescence from a phosphor coating will indicate the temperature of substrate to which it is attached, assuming thermal equilibrium achieved. The goal this investigation identify phosphors for making measurements on aerospace surfaces with temperatures varying ambient 1000 C and test binders/adhesives that may be mixed thermographic sprayed onto interest provide durable uniform coating. include various high-strength metal alloys, such as stainless steel nickel without barrier coats,...
The results of a field test in commercial turbine engine showed that we can remotely measure the temperature components operating engines using thermographic phosphors. remote-measurement method exploits dependence characteristic decay time laser-induced fluorescence This paper summarizes recent work leading up to and including successful thermographic-phosphor an engine.
The excitation and emission spectra of several thermographic phosphors, europium-doped yttrium oxide (Y/sub 2/O/sub 3/:Eu/sup 3+/), vanadate (YVO/sub 4/: Eu/sup barium phosphate (Ba/sub 3/(PO/sub 4/)/sub 2/: 2+/), gadolinium-doped 3/: Gd), praseodymium-doped oxysulfide 2/S: Pr), have been measured as a function temperature. charge transfer (C-T) absorption bands for each phosphor were studied spectral shifts broadening. Of these particular thermophosphors, oxide, vanadate, show significant...
Remote cryogenic temperature measurements can be made by inducing fluorescence in phosphors with temperature-dependent emissions and measuring the emission lifetimes. The thermographic phosphor technique used for making precision, noncontact, cryogenic-temperature electrically hostile environments, such as high dc electric or magnetic fields. National Aeronautics Space Administration is interested using these mapping hot spots on tank walls. Europium-doped lanthanum oxysulfide (La2O2S:Eu)...
Fluorescence from phosphor coatings is the basis of an established technique for measuring temperature in a wide variety turbine and combustion engine applications. Example surfaces include blades, vanes, combustors, intake valves, pistons, rotors. Many situations that are remote noncontact require high intensity laser to illuminate phosphor, especially if surface moving. Thermometric resolutions 0.1 C obtainable, some laboratory versions these systems have been calibrated against NIST...
Phosphor thermometry has been used for many years non -contact temperature measurements. Aerospace systems are particularly prone to adverse high environments, including large blackbody background, vibration, rotation, fire/flame, pressure, or noise. These environments often restrict the use of more common thermocouples infrared thermometric techniques. Temperature measurements inside jet turbines, rocket engines, similar devices especially amenable fluorescence tech niques. Often phosphor...
Temperature-sensitive paint (TSP) comprised of thermally sensitive phosphor can provide a viable means for noncontact thermometry in wind tunnel and other aeropropulsion applications. Described here are recent results aimed at developing binder system that will cover wide temperature range, ambient to 1000/spl deg/C. The phosphor/binder mixture is be sprayed directly on the surface with an airbrush. Whereas many surfaces candidates various uses, present effort concerned silicon carbide,...
The thermographic phosphor (TGP) Labkit is a flexible instrument for students beyond the first year and also useful laboratory tool physics research development.It aids in teaching demonstrating number of concepts skills.Students will learn important aspects optical spectroscopy.By producing fluorescence measuring its characteristics versus temperature, become familiar with atomic energy levels, lifetimes, radiative non-radiative transitions, spectral bands linewidth, distribution,...
Research is underway at Oak Ridge National Laboratory (ORNL) that could lead to entirely new, highly energy-efficient ways of lighting buildings using the power sunlight. In addition providing light, hybrid system will convert sunlight electricity much more efficiently than conventional solar technologies thermo-photovoltaic cells. commercial today, consumes electric energy any other building end-use. It accounts for a third all consumed use in United States. Typically, less 25% actually...
Increased use of solar energy will reduce requirements for non-renewable sources such as fossil fuels and associated greenhouse gas emissions. The benefits replacing fossil-based with are often dependent on the application operational or duty cycle power demand. One particularly efficient is hybrid lighting. In lighting, light concentrated into optical fibers then coupled supplemental electrical lighting to maintain a constant level illumination. system able offer reliable less consumption...
Hybrid solar lighting (HSL) is a technology in which sunlight collected and distributed via optical fibers into the interior of buildings. Analogous to hybrid electric vehicles that use both batteries internal combustion engines power cars, employs roof-mounted collectors concentrate flexible carry it inside buildings “hybrid” light fixtures also contain lamps. As two sources work tandem, control systems keep levels constant by dimming lights when bright, turning them up as sky darkens with...