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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 38 for “"uncooled"”.
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Characterization of noise in uncooled IR bolometer arrays
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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Annealing studies of detector materials for uncooled thermal imaging
Uncooled thermal imaging is a key technology for military applications. The sensors used are thermal detectors which respond to changes in temperature resulting from absorption of infrared radiation, generally in the 8-14µm waveband. In the UK these have been principally based on the pyroelectric …
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Measurement and analysis of 1/f noise in uncooled microbolometers
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2000.
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Use of Ion Implantation in the Construction of an Uncooled Microbolometer
Uncooled infrared (IR) bolometers have been constructed using a sensor bridge made of an electrically conductive polymer attached to a quartz substrate. The bridge is mounted on two sides and crosses an etched trough in the underlying substrate. Current is supplied to the bridge by means of two …
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Uncooled choked plasma torch for ignition and flameholding in supersonic combustion
An experimental investigation on an uncooled choked plasma torch using hydrogen/argon mixtures as a propellant was conducted. This low-power plasma torch was designed to be used as an ignitor and flameholder in supersonic combustion. The anode and cathode were made of two-percent thoriated …
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Operation of a High-Pressure Uncooled Plasma Torch with Hydrocarbon Feedstocks
The main scope of this project was to determine if a plasma torch could operate on pure hydrocarbon feedstocks and, if so, to catalogue the torch operational characteristics. The future goal of the project is to design a plasma torch for supersonic combustion applications that operates off of the …
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Frequency Selective Detection of Infrared Radiation in Uncooled Optical Nano-Antenna Array
… Various kinds of microbolometers offer uncooled detection of IR radiation. However, broadband absorption of microbolometers makes them less sensitive to spectrally resolved detection of infrared radiation and the fabrication is also very tedious involving multiple complex lithography …
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Aerodynamic measurement and analysis of the flow in an uncooled turbine stage
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1998.
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Performance of uncooled 1.3 [mu]m FP and DFB lasers in hybrid fiber-coax (HFC) networks
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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A Systematic Review of the Psychological Effects of Heat Stress on Subjects in Uncooled, Sealed, Environment Suits
… effects of heat stress for individuals in uncooled pressure suits and the timeline when these effects would occur. Recent growth in the commercial spaceflight industry has led to renewed interest in environment suits to protect against decompression events. Such suits impair the body’s …
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Aluminum nitride microelectromechanical infrared detectors with integrated metamaterial absorbers
This work reports the development of uncooled spectrally selective mid-infrared (IR) detectors based on the seamless integration of metamaterial (MM) structures with microelectromechanical (MEMS) AlN resonators. Historically, uncooled absorbers have been limited in two key metrics: selectivity, the …
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New pyroelectric phenomena from graded ferroelectric barium strontium titanate thin films
… of graded ferroelectric thin films in uncooled pyroelectric detectors. We built a magnetron sputter system, and developed a method of deposited compositional graded ferroelectric thin films using rf magnetron sputtering, a silicon compatible thin film fabrication process. By obtaining …
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Two-photon absorption in bulk semiconductors and quantum well structures and its applications
… 2PA, for mid-infrared (mid-IR) detection in uncooled semiconductors. The use of END, where the two photons have very different energies gives strong enhancement comapared to degenerate 2PA. This END-2PA enhanced detection is also applied to mid-IR imaging and light detection and ranging …
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Aerodynamic performance measurements of a fully scaled, film-coated, turbine stage
… flow. A preliminary comparison to a previous uncooled test series showed a 2% decrease in efficiency with a 12% coolant-to-mainstream mass flow ratio. To complete these tests, an uncooled turbine configuration was modified to a film-cooled configuration. A solid blade and nozzle guide vane set …
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Wavelength agnostic WDM strategies for avionic telecommunications
… will be temperature insensitive and capable of uncooled operation. This has been thoroughly studied and temperature ranges for uncooled operation identified with different end node components. Different cooling techniques have also been studied; one technique using a phase change material for …
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Novel solid state modulator for the infrared: the germanium chopper
Uncooled thermal imaging cameras in the 8 to 14 µm band use pyroelectric array detectors as the preferred technology. The systems advantages offered by these uncooled detectors are those of reduced cost, complexity and power consumption. The price paid for this uncooled technology is that the image …
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The impact and fate of aqueous sodium nitrate on hydrocarbon flames
… The flames were stabilized on a slotted, uncooled burner. The data set was divided into profiles of relative sodium atom concentrations, temperatures, and selected stable species concentrations. The flames were simulated using a modified version of the Sandia FORTRAN program for modeling …
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An investigation of the effect of a tangential gas velocity on combustion instability.
A small, uncooled research rocket motor was built to study the effects of a vortex flow on combustion instability. Normal heptane and air were used as propellants with the air being divided into two flows; a primary flow at the center of the combustion chamber and a secondary flow at the periphery …
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Scalable 3D carbon nanotube structures for bolometric infrared sensor arrays
… applications such as autonomous vehicles. Uncooled infrared sensors work on a bolometer principle, where the infrared energy is absorbed, increasing the temperature of the device. This temperature change can be measured electrically using a thermistor. Carbon nanotubes (CNTs) have high …
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Vapor-liquid-solid (VLS) growth of lead chalcogenide thin films for infrared sensing applications
… goal of this project is to develop materials for uncooled IR sensors with improved performance. Lead selenide (PbSe) detectors are direct narrow band gap materials that have shown promise for relatively inexpensive IR sensing with modest cooling requirements. Adapting the vapour-liquid-solid (VLS) …
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