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 164 for “"Light Detection"”.
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Visible and Infrared Light Detection Using 2D Materials
… applications. With respect to longer wavelength detection, application of 2D crystals and other ultrathin materials such as ALD grown Hafnium Zirconium Oxide (Hf₀.₅Zr₀.₅O₂) open up the possibility of designing fast (<1 ms thermal time constant) thermal detectors while still maintaining high …
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Quantum state reconstruction and tomography using phase-sensitive light detection
… be capable to perform non-demolition homodyne detection of squeezed light in a high-finesse cavity QED setup with an ensemble of Cesium atoms coupled to the cavity. After quantifying sources of noise, the photodiode efficiency, we perform a series of measurements of low photon number coherent …
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Using Light Detection and Ranging (LiDAR) Imagery to Model Radio Wave Propagation
The purpose of this study was to determine if light detection and ranging (LiDAR) imagery could provide a significantly more accurate data set for modeling near line-of-sight (LOS) propagation at higher frequencies, specifically 27.810 GHz. than a USGS digital elevation model (DEM). In addition, …
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Development of a light detection system for bidirectional measurements over the solar spectrum and sun course simulations with scale models
The use of natural light in building structures can increase energy efficiency and lead to more sustainable architecture. To encourage such use of natural light, a dual experimental device is being developed at MIT to help evaluate the effectiveness of various daylighting approaches, to be used as …
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Modeling Loblolly Pine Dominant Height Using Airborne LiDAR
… laser scanning technology, known as light detection and ranging (or just LiDAR), over young and mature forest stands using regression analysis. LiDAR plot metrics were regressed against field measured dominant height using Best Subsets Regression to reduce the number of models. From …
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On the Determination of Building Footprints from LIDAR Data
… boundaries through automatic processing of light detection and ranging (LIDAR) data is presented. The LIDAR data is processed and interpolated into a grayscale image of intensity values corresponding to height measurements. Ground measurements are separated from non-ground measurements by …
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Integrated optical phased arrays for three-dimensional display applications
… integrated optical phased arrays (OPAs) for light detection and ranging (LiDAR) and free-space communications. However, silicon is limited to operating at infrared wavelengths since its bandgap prevents visible light transmission. The development of integrated OPAs for arbitrary complex …
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Aerial Lidar in the Archaeological Reconnaissance and Mapping Of Civil War Earthen Fortifications
… fortifications is paramount. Airborne LiDAR, Light Detection and Ranging, scanning provides researchers with the unique opportunity to remotely visualize topographic data under forested areas. Starting in the mid 1900’s state and federal agencies began collecting this data and making it freely …
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Improving Tree Crown Mapping using Airborne LiDAR with Genetic Algorithms
… mapping of individual trees derived from LiDAR (Light Detection And Ranging) data have been found to be valuable for a wide range of environmental analyses including carbon inventories; fuel estimations for wildfire risk assessment and management. These mapping efforts use individual tree crown …
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Development of an Optical System for Measuring Fluorescence Lifetimes
… portable, and simplified fluorescence detection system for measuring fluorescence lifetime decay as an alternative to the available methods currently in use. There are multiple systems available to detect fluorescence of a sample, but they contain multiple parts and require expensive …
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Multirotor UAS Sense and Avoid with Sensor Fusion
… Systems (UAS) are explored including obstacle detection, dynamic obstacle state estimation, and avoidance strategy. This area is explored in pursuit of determining the viability of UAS Sense and Avoid (SAA) in static and dynamic operational environments. This exploration is driven by dynamic …
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Development of a Landing Period Indicator and the Use of Signal Prediction to Improve Landing Methodologies of Autonomous Unmanned Aerial Vehicles on Maritime Vessels
… is a quad-rotor UAV that is equipped with a light detection and ranging system to aerially detect ship motion. The observed ship motion is forecasted using signal prediction which identifies and notifies the UAV of potential landing opportunities. The Signal Prediction Algorithm (SPA) is also …
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Autonomous quadrotor unmanned aerial vehicle for culvert inspection
… the relative scarcity of objects visible to the Light Detection And Ranging sensor (LIDAR). The GPS data is fused in a new state estimator, which also incorporates data from the scan matcher running on the LIDAR data, as well as the data from the quadrotor's Inertial Measurement Unit (IMU). This …
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An application of LIDAR to examine erosion in the southern Monterey Bay during the 1997-98 El Nino
Light Detection and Ranging (LIDAR) was used in a Geographic Information System (GIS) to quantify coastal changes to beaches and dunes in the Southern Monterey Bay region and to qualitatively assess the erosional impact of large storms on coastal dune areas. LIDAR provides a rapid and accurate …
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A Study in Object Detection and Classification Performance by Sensing Modality for Autonomous Surface Vessels
… a quantitative performance comparison between light detection and ranging (LiDAR) and vision-based sensing for real-time maritime object detection on autonomous surface vessels. Using Embry-Riddle Aeronautical University’s (ERAU) Minion platform and 2024 Maritime RobotX Challenge data, this …
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Fusion Approaches to Individual Tree Species Classification Using Multi-Source Remotely Sensed Data
… spatial resolution panchromatic image (PAN), and Light Detection and Ranging (LiDAR) data for five object-based tree species classification in an urban environment. The results demonstrated that 3D structural features contributed more to tree species with broad crowns, such as honey locust and …
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Elevation Changes in Greenland over Two Decades from Cross-Platform LIDAR Analysis
… and Ice Sensor (LVIS) are two airborne Light Detection and Ranging (LIDAR) systems that retrieve information about surface elevation and roughness. Both altimeters have been flown in Greenland to measure changes in ice sheet surface elevation through time. ATM surveys in the region have …
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Methods of determining stream setback corridors in urban watersheds from remotely sensed data in the Dallas metropolitan area, Texas.
… based from remotely sensed data, such as Light Detection and Ranging (LiDAR) with higher accuracy, as well as geological parameters such as channel material. Stream setbacks are easily calculated using computer-aided mapping technology, through the use of remotely sensed data and setbacks …
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