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 32 for “"LWIR"”.
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Multi-modal object detection in non-corresponding imagery using unsupervised techniques
… The presented thesis focuses on multi-modal (RGB-LWIR) object detection for surveillance in a Security and Defence context. At present, the current state-of-the-art in object detection use convolutional neural networks (CNNs). CNNs require large datasets for training; however, there is a severe …
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Rangefinding in Fire Smoke Environments
… cameras as well as a long-wavelength infrared (LWIR) stereo vision system developed in this research. The smoke was varied from dense, low temperature smoke to light, high temperature smoke for evaluation in a range of conditions. Through small-scale experiments on eleven different sensors, …
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Unipolar barrier strained layer superlattice infrared photodiodes : physics and barrier engineering
… (MWIR, 3-5\uf06dm) and longwave infrared (LWIR, 8-12\uf06dm) regimes. The bandstructure of InAs/GaSb/AlSb superlattices has been simulated in this work using empirical pseudopotential method. The simulation results have been used extensively in the later part of this work for designing …
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The design and fabrication of an inp-based transistor-injected quantum cascade laser
… mid-wave infrared (MWIR) and long-wave infrared (LWIR) spectral ranges have been garnering attention for their application in a variety of fields including chemical sensing and free-space communication. Efficient and compact coherent sources in these wavelength ranges are important for enabling …
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Long-wave infrared frequency combs based on quantum cascade lasers
… imgaing and infrared countermeasures. The LWIR region (or mid-infrared region), roughly ranging from 2-20 [mu]m, is of particular importance to spectroscopy applications, since many molecular species have their strongest rotational-vibrational absorption bands in that area. Infrared laser …
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Novel etch studies and passivation techniques on InAs/GaSb superlattice based infrared detectors
… long-wave (LW) and very long-wave infrared (VLWIR) ranges. The large electron effective mass in SLS help in reducing inter-band tunneling and hence allow for longer-wavelength operation in these IR detectors. Large splitting between heavy-hole and light-hole valence subbands due to strain in …
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InAs/Ga(In)Sb superlattice based infrared detectors using nBn design
… infrared (MWIR) (3-5μm) and long-wave infrared (LWIR) (8-12μm) have many applications in military, industrial and medical fields. The state-of-the-art photodetectors based on Hg1-xCdxTe (MCT) have large signal over noise ratio and their bandgap can be tuned to span 1-32 μm wavelength range. …
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Multi-spectral System for Autonomous Robotic Location of Fires Indoors
… sensor platform used a long wavelength infrared (LWIR) camera and ultraviolet (UV) sensor. The LWIR camera was chosen for its ability to see through smoke, while the UV sensor was selected for its ability to discriminate between fires and non-fire hot objects. The fire location algorithm by …
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Applying Rotation-Equivariant Deep Learning to Cloud and Road Segmentation in Satellite and Aerial Imagery
… trained on visible-spectrum, long-wave infrared (LWIR), and short-wave infrared (SWIR) imagery for on-orbit cloud detection. Rotation-equivariant deep learning models are equivariant to rotations, meaning that when an input to the model is rotated, the model output will be equivalently rotated. We …
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Characterization of spectral response of a quantum dots-in-a-well infrared focal plane array
… mid-wave infrared (MWIR) and long-wave infrared (LWIR) performance believed to be attributed to transitions from bound states in the dot to higher and lower lying energy states in the quantum well, respectively. The DWELL samples were grown by molecular beam epitaxy (MBE) and fabricated into 320 x …
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Low temperature heterogeneous integration of germanium on silicon
… transparency in the mid-longwave infrared (mid-LWIR) range, and its ease of integration on a Si backbone make it a perfect candidate for photodetectors (PDs) for Telecom optical interconnects and waveguides for mid-LWIR optical sensors. However, optical interconnects are still larger than …
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Investigation of InAs/GaSb superlattice based nBn detectors and focal plane arrays
… pixel nBn SLS devices operating in the MWIR and LWIR spectral regions; 2) development of a MWIR focal plane array (FPA) based on the InAs/GaSb SLS detector with the nBn design; 3) development of a new passivation method for mid wave infrared (MWIR) and long wave infrared (LWIR) p-i-n SLS …
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Vanadium Oxide Microbolometers with Patterned Gold Black or Plasmonic Resonant Absorbers
… structures designed for long-wave infrared (LWIR) absorption have also been investigated. Dispersion of the dielectric refractive index provides for multiple overlapping resonances that span the 8-12 ?m LWIR wavelength band, a broader range than can be achieved using the usual resonance …
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Defect characterization of antimonide-based type-II superlattices for infrared detection
… of mid- to long-wavelength infrared (MWIR, LWIR) radiation. The type-II broken band gap alignment of these heterostructures allows electrons and holes to be confined in separate but adjacent, nanometer scale thickness, material layers. When arranged in a highly periodic structure comprised …
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Development of antenna-coupled metal-insulator-metal diodes for infrared detection
The long-wavelength infrared (LWIR) band between 7 and 14 µm is significant for thermal imaging purposes because it coincides with the blackbody radiation peak of the human body and a low absorption window in the earth’s atmosphere. Also, at 10 µm wavelength, the earth’s terrestrial radiation is …
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Mems approaches in infrared imaging
… systems currently available in the MWIR and LWIR spectral range.
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Diffusion characterization of antimony-based type-II superlattices using electron beam induced current and time-resolved photoluminescence
… their mid-wave or long-wave infrared (MWIR or LWIR) detection capabilities. Although T2SLs are predicted to have superior performance, when compared to the current state-of-the-art infrared detectors, such performance has yet to be demonstrated. A primary limiting factor in T2SL device …
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Longwave and bi-color type-II InAs/(In)GaSb superlattice infrared detectors
… were designed and optimized for LW SL detectors. LWIR pin and nBn detectors were introduced and their optical and electrical properties were compared. LW nBn detectors show higher device performance in terms of lower dark current density and higher responsivity as compared to the LW pin detectors. …
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