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 38 for “"Focal plane array"”.
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Gated multi-cycle integration (GMCI) for focal plane array (FPA) applications
… (GMCI) were first developed specifically for focal plane array dealing with repetitive or modulated image. The operational modes of GMCI include gated integration (GI), phase sensitive integration (PSI), multi-point summation, multi-point subtraction, multi-sample averaging and some of their …
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Fixed pattern noise compensation in a mercury cadmium telluride infrared focal plane array
… a result of nonuniformities within the infrared focal plane detector array. The techniques presented dispense with the need for traditional temperature references, and provide nonuniformity compensation by using only the statistics of the moving infrared scene and motion of the camera assembly …
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Characterization of spectral response of a quantum dots-in-a-well infrared focal plane array
… quantum dots-in-a-well (DWELL) infrared focal plane array (FPA) was undertaken and reported here. The hypothesis of the study is that the FPA will exhibit bias-tunable spectral response. Broadband and two-color performance measures of the DWELL FPA are discussed and presented. The DWELL …
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Antenna-coupled Tunnel Diodes For Dual-band Millimeter-wave/infrared F
… imaging systems employing a common focal-plane array that responds to both wavebands are desirable from the viewpoint of overall size and weight. We have developed antenna-coupled sensors that respond simultaneously at 30 THz and at 94 GHz, utilizing electron-beam lithography. …
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Terahertz imaging and quantum cascade laser based devices
… laser (QCL) sources, along with commercial, focal plane array thermal detectors. The system uses a high power (48 mW) 4.3-THz QCL, which is also used to characterize the focal plane array, resulting in a noise equivalent power (NEP) of 320 pW/Hz. The source and detector are used in a …
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Data compressive paradigm for spectral sensing and classification using electrically tunable detectors
… capability of tunable DWELL IR focal-plane array (FPA), again without using any spectral filters; and (3) development of a generalized filter-free data-compressive spectral sensing paradigm using the DWELL detector that enables arbitrarily specified MS sensing (e.g., spectral …
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Analog multiply and accumulate FPA readout circuit with digital multiply and sign maintenance
… the data coming from modern high resolution focal plane arrays leads to the necessity for fast and efficient read out and data processing. A system that performs block recognition and image classification with efficiency and low latency is presented. The system is comprised of an analog …
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Modeling challenges of advanced thermal imagers
… The advanced thermal imager contains a staring focal plane array, which may be sensitive to multiple spectra, and light enough to be mounted on a rifle. Research was conducted to address portions of these three areas. Psychophysical experiments were conducted to model the impact of insufficient …
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Design, fabrication and characterization of terahertz quantum-well photodetectors
… a fast and sensitive THz photodetector ready for array integration is not available. A THz Quantum-well Photodetector (QWP) has the properties of being fast, sensitive, low-noise, and narrow-band. It is promising for large-array integration for THz imaging. In addition, a THz QWP-LED …
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Methods to achieve wavelength selectivity in infrared microbolometers and reduced thermal mass microbolometers
… the lithographically drawn parameters of the array. Hence, different pixels in a focal plane array can be designed to produce a “multi-color” infrared imaging system. Also, the thermal mass of microbolometer is reduced using patterned resistive structure.
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Impact of the boundary layer on pointing and tracking in airborne free-space laser communication links
… investigated the tracking challenge using a focal plane array sensor with centroid and peak tracking algorithms. Also investigated was the use of a deformable mirror to recreate optical phase distortions from boundary layer turbulence. Experiments were conducted with realistic channel effects …
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Design consideration, trade-off and performance analysis of a high-resolution optical telescope design for a satellite
… include opto-mechanical design, thermal design, focal plane array assembly, manufacturing and detailed AIT procedure.
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Investigation of thermal electric cooler-less microbolometer infrared imaging
… a Thermal Electric Cooler (TEC) to stabilize the Focal Plane Array (FPA). An FPA is an array of microbolometers which are small vanadium oxide elements whose resistances are very sensitive to IR radiation. The ability to run an imaging module without the TEC results in significant reduction in FPA …
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Differenzierung von humanen Plattenepithelkarzinomen mittels IR-mikrospektroskopischem Imaging
… das IR-mikrospektroskopische Imaging mittels Focal Plane Array Detektor (FPA) genutzt. Die Herausforderung liegt in der Datenanalyse. Der große Datenumfang macht die Anwendung multivariater Algorithmen notwendig. Angewendet wurden Clusteralgorithmen zur Spektrendifferenzierung und die SIMCA …
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Computed Tomographic Imaging Spectrometry
… data set in a single snapshot (one focal plane array integration time) with no moving parts. A specially designed dispersing element, which separates light from the three-dimensional object cube into a grid of two-dimensional prismatic diffraction orders, is the key element in the …
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Advancing profiling sensors with a wireless approach
… imagers that typically utilize a sparse detector array, whereas traditional cameras employ a dense focal-plane array. Profiling sensors are of particular interest in applications that require classification of a sensed object into broad categories, such as human, animal, or vehicle. However, …
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A UHF Multimode Array Feed for the Westford Radio Telescope
A novel UHF Multimode Array Feed (MMAF) has been created for MIT’s Westford Radio Telescope. The MMAF is a dual-linear focal plane array installed concentrically with the existing QRFH feed on the telescope, enabling a combined system capable of transmit or receive on UHF radar and satcom …
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Design and Qualification of a Coded Aperture Cycloidal Mass Spectrometer to Detect Perfluorocarbon Tracer Molecules for Environmental Applications
… cycloidal mass analyzer, aperture coding, and a focal plane array detector, to enable a mobile instrument capable of detecting PFC tracers with high resolution, sensitivity, and selectivity. The cycloidal mass analyzer utilizes perpendicularly-oriented overlapping electric and magnetic fields to …
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Heterostructure engineering of quantum dots-in-a-well infrared photodetectors
… multispectral operation, and large format arrays. The quantum dot infrared photodetector technology, owing to the three-dimensional confinement of carriers, the richness of the electronic spectra in quantum dots, and the mature III-V based fabrication technology, satisfy these requirements. …
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Test of the Infrared Wide-Field Camera OMEGA2000 and its Application for an Extragalactic Survey
… at Calar Alto. The camera uses a 2kx2k HAWAII-2 Focal plane array with a sensitivity from z to K band. In the first part of the thesis, we discuss the work aimed at optimizing the operation of the HAWAII-2 detector installed in the camera. We tested the operation of three speciemen from the …
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