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Showing 1 to 20 of 34 for “"pyrometry"”.
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Optical pyrometry for noncontact temperature measurement
A noncontact two-color pyrometer, which uses an infrared (IR) transmitting rod and IR lenses to optically measure the temperature of a molten particle as it falls in an evacuated drop tube, has been designed and tested in the laboratory and in the field. The design uses a calcium fluoride (CaF₂) …
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Development of Color Ratio Thin Filament Pyrometry Approach for Applications in High Speed Flames
Thin filament pyrometry is a proven technique used to measure flame temperature by capturing the spectral radiance produced by the immersion of silicon carbide filaments in a hot gas environment. In this study a commercially available CMOS color camera was used, and the spectral response of each …
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Accurate pyrometry inside an arc furnace by taking into account the surface emissivity with a ray-tracing analysis
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1996, and Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1996.
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Laser Chemical Vapor Deposition of Titanium Nitride and Process Diagnostics With Laser-Induced Fluorescence Spectroscopy
… above the substrate. Multi-wavelength pyrometry is applied to measure the surface temperature during deposition. Film thickness profiles are obtained by stylus profilometry, and film compositions are analyzed by Auger Electron Spectroscopy (AES).
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Explosive initiation of tungsten based reactive materials in air
… High speed pressure, shadowgraph imaging, pyrometry and spectroscopy diagnostics were developed and used concurrently for tests conducted in these facilities. Well known thermite, intermetallic and reactive metal compounds were detonated in the smaller of the two facilities. Increased …
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Temperature reconstruction and acoustic time of flight determination for boiler furnace exit temperature measurement
… the design of heat transfer surfaces. Acoustic pyrometry, a technique that measures temperature based on the travel time of an acoustic wave in a gas, is investigated as a viable solution for continuous direct measurement of the FEGT. This study focuses specifically on using acoustic pyrometry …
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An investigation of the temperature distribution induced during laser chemical vapor deposition (LCVD) of titanium nitride on titanium-aluminum-vanadium
… (LCVD), spatially resolved multi-wavelength pyrometry measurements of the substrate temperature have been made during LCVD of titanium nitride (TiN) on Ti-6Al-4V substrates. The precursors that have been used are TiCl$\sb4,$ N$\sb2,$ and H$\sb2.$ Also, deposition has been studied as a …
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Optical combustion measurements of novel energetic materials in a heterogeneous shock tube
… burning particles is analyzed using photometry, pyrometry, and emission spectroscopy to determine important quantifiable combustion characteristics such as temperature, burning time, ignition delay, and reaction intermediate species. The heterogeneous shock tube is a highly controlled experiment …
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Combustion dynamics of individual reactive material particles
… has been expanded to include three-color optical pyrometry and tracing characteristic molecular emission. Results for Al and novel Al-based composite materials burning in different oxidizing environments will be discussed.
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Reaction Synthesis of HfB2 in a Variety of Metallic Environments
… and enthalpies of reaction; and optical pyrometry to measure maximum reaction temperatures. Overall, DSC results indicated melting preceded reaction initiation; suggesting that the reaction initiation temperature for a certain blend occurred soon after melt formation, and could be broadly …
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Development of a Miniature, Semi-Distributed Sapphire Fiber Optic Thermometer for Harsh and High Temperature Environments
… 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 terms of size and insensitivity to harsh conditions such as extreme temperatures and corrosive environments. The …
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Investigation into methods for the calculation and measurement of pulverised coal boiler flue gas furnace exit temperature
… The direct method studied is acoustic pyrometry. The work specifically focuses on the sources of error in determining the temperature from the measurement of the time of flight of sound, the impact of particle concentration on the speed of sound through a gas-particle mixture, and the …
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Physical Conditions and Chemical Processes During Single-Bubble Sonoluminescence
… plasma diagnostics, and spectrometric methods of pyrometry), it was possible to quantify the heavy particle temperatures (15,000 K), heavy particle densities (1021 cm-3) and pressures (4,000 bar), and plasma electron densities (1018 cm -3) generated during SBSL from H2SO4. It was also found that …
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Containerless processing of stainless steel
… levitation facility. High-speed video and pyrometry allowed the study of phase selection and secondary nucleation mechanisms for that alloy as well as measurements of delay times and growth velocities. Double recalescence events were observed for the first time at temperatures near the To …
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Black Liquor Droplet Combustion and Modeling
… a mass balance. Simultaneous video images and pyrometry data provide mass loss and internal temperature data. These investigations provide an extensive data set from which to validate a model and insight into the mechanisms of combustion. Particles burning in air expelled ejecta from the …
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Small scaled reactive materials combustion test facility
… also allows for optical measurements including pyrometry and spectroscopy. In this work the diagnostic measurements are primarily the bullet velocity and chamber overpressure. After completion of the design and installation of the laser optical chronograph and the appropriate pressure …
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Spectroscopic Measurements of the Combustion of Aluminum and Aluminum-Based Energetic Material Particles Using a Heterogeneous Shock Tube
… the burning cloud, through techniques including pyrometry, photometry, and emission and absorption spectroscopy. These measurements have led to the determination that aluminum particles below 10 mum do not burn with the gas-phase diffusion flame observed in larger (>20 mum) sizes, but rather with …
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Novel Gel-Infused Additively Manufactured Hybrid Rocket Solid Fuels
… and temporally resolved three-color camera pyrometry analysis. The process showed promise in determining aluminized gel burn time across an entire rocket firing. The performance of the gel infused grains was compared to a traditional center perforated fuel grain, under similar flows of …
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Fluorescent Materials and Thin Film Coatings for Temperature Sensing Applications
… harsh conditions. Non-contact techniques like pyrometry offer faster measurements but are constrained by emissivity dependence, line-of-sight integration, background emission, and environmental interference. To address these limitations, luminescent temperature sensors based on thermographic …
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Dynamics of nanoparticle combustion
… using optical diagnostics. In order to use pyrometry measurements for nano-aluminum particles, the emissivity of nano-alumina particles was also measured using the shock tube to heat the particles to known temperatures. The burning time and peak particle temperature results suggested that …
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