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 20 of 203 for “"imager"”.
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A locally-adaptive imager
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
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A scalable packetised radio astronomy imager
Modern radio astronomy telescopes the world over require digital back-ends. The complexity of these systems depends on many site-specific factors, including the number of antennas, beams and frequency channels and the bandwidth to be processed. With the increasing popularity for ever larger …
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Advanced Prototypes of the Aerosol Limb Imager
… to address this call. The Aerosol Limb Imager, or ALI, is a candidate remote sensing instrument that will provide this monitoring. ALI is a Canadian developed atmospheric remote sensing instrument specifically designed to be sensitive to aerosol and clouds from the mid-troposphere …
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Silicon nanocrystals: from bio-imager to erbium sensitizer
The work in this thesis has been centred on the light emitting properties of silicon nanocrystals and the possible applications of this particular material platform to various topics ranging from bio-imaging to erbium ion sensitization. Silicon nanocrystals as bio-imaging agent have been …
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A wide-dynamic-range time-based CMOS imager
… suitable for use in wide-dynamic-range CMOS imagers. A prototype 150 x 256 pixel imager employing this algorithm experimentally achieves 95.5 dB dynamic range, 37 dB peak signal-to-noise ratio (SNR), and a highly-linear transfer characteristic while consuming 1.79 nJ/pixel/frame, making it …
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Millikelvin temperature control system for the ExoplanetSat Imager
… of the temperature control of the ExoplanetSat imager during orbit night, characterizing the temperature response of any potential imager, and part of the design can be applied to the flight model of the prototype of ExoplanetSat for irnager temperature control.
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Efficient image compression system using a CMOS transform imager
… the many potential applications of a transform imager system. The study includes implementing the image compression system using a transform imager, developing a novel image compression algorithm for the system, and improving the performance of the image compression system through efficient …
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A prototype Compton imager : simulations, measurements and algorithm development
… the actual source position. A prototype Compton imager (PCI) has been constructed at Los Alamos National Laboratory (LANL) that uses a combination of silicon and CsI detectors. A model of the PCI has been simulated and validated, showing good agreement with measured data. The angular resolution …
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The Galaxy and beyond with the Arcminute Microkelvin Imager
The Arcminute Microkelvin Imager (AMI) is a dual-array radio interferometer sited at Lord's Bridge, near Cambridge. Although it was designed specifically for studying galaxy clusters via observations of the Sunyaev-Zel'dovich (SZ) effect, it is also an ideal instrument for Galactic science. This …
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Multiwavelength Study of Photodissociation Regions and a Near -Infrared Imager
… construction and operation of the Near Infrared Imager (NIRIM), which was commissioned at the Mt. Laguna 1-meter telescope in August 1995. NIRIM was used for high-resolution wide-field imaging of the PDR in the reflection nebula NGC 2023. We found that the fluorescent molecular hydrogen in NGC …
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Bayesian Modelling of Galaxy Clusters with the Arcminute Microkelvin Imager
The Arcminute Microkelvin Imager (AMI) is a dual-array interferometer comprising the Small Array (SA) and Large Array (LA), operating between 13 GHz–18 GHz, situated at Lord’s Bridge, near Cambridge. It was designed to observe galaxy clusters using the Sunyaev Zel’dovich (SZ) effect. The SA is used …
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Three-Dimensional Imaging using a Novel Rotating Point Spread Function Imager
… Our rotating point spread function (RPSF) imager will allow for nm resolution in all three dimensions in a single snapshot over a much larger axial field depth. This will help indirectly in achieving a much better temporal resolution by means of 3D video sequences in order to study dynamics …
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High-latitude electron density observations from the IMAGE radio plasma imager
… exclusively by in situ means. The Radio Plasma Imager instrument onboard IMAGE is capable of remotely observing electron densities between 0.01 and 100,000 e-/cm-3 from distances of several Earth radii or more. This allows a global view of the high latitude region that has a far greater accuracy …
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Three dimensional moving pictures with a single imager and microfluidic lens
… This research result shows that a single imager, equipped with a fast-focus microfluidic lens, produces a highly accurate depth map. On test material, the depth is found to be an average Root Mean Squared Error (RMSE) of 3.543 gray level steps (1.38\%) accuracy compared to ranging data. …
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The Adaptive Optics Lucky Imager: combining adaptive optics and lucky imaging
… and lucky imaging. The Adaptive Optics Lucky Imager (AOLI), being developed at Cambridge as part of a European collaboration, combines these two techniques in a dedicated instrument for the first time. The instrument is designed initially for use on the 4.2m William Herschel Telescope (WHT) on …
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Blind and pointed Sunyaev-Zel'dovich observations with the Arcminute Microkelvin Imager
… I discuss my work on the Arcminute Microkelvin Imager (AMI). I focus on the detection of Sunyaev-Zel’dovich (SZ) signatures at 14-18GHz. Once the background science and operation of the instrument are described I proceed to present my contribution to the calibration of AMI, including: primary …
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Immersion cooled environmental monitoring and prediction system for the meerKAT imager
This paper reports on an immersion cooling method used to reduce power consumption in a data centre. This study involves a case study of the MeerKAT Science Processor that is responsible for the MeerKAT imaging pipeline. Immersion cooling brings a coolant into direct physical contact with the chips …
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Scalable design of high-performance on-chip Terahertz source and imager
In this thesis, two chip designs using the scalable array architecture are introduced. Firstly, we introduce a scalable architecture of coherent harmonic oscillator array for high-power and collimated radiation beam at mid-THz band. The array is 2D-coupled, and each element achieves these …
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Hardware for performing hyperpolarized helium imaging on a clinical MR imager
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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A Hyperspectral Imager for a Cubesat to Identify Ocean Ship Parameters
A Hyperspectral imager aboard a cubesat would be able to provide images which could be used to identify ships and determine the ship's length and breadth and heading. Depending on the size of the ship, the speed the ship is traveling can be determined as well; however the speed and size …
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