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4 results on '"Downing, Thane"'

1. Optimal Trajectory Generation for Exploration of Three Dimensional Spaces

Author

Forsgren, Brendon, Nielsen, Seth, and Downing, Thane

Subjects
Differential Flatness, Trajectory Optimization, Traveling Salesman
Abstract

Trajectory generation and path planning are an important part of UAV autonomy, and the ability to successfully determine the path to complete a mission is an open research area. Many techniques require previous knowledge of the environment to ensure a collision free path while others seek to be able to generate trajectories and re-plan in real-time to avoid obstacles. We present a framework that allows a quadrotor UAV to explore a sparsely populated, unknown region given a set of target waypoints. Our framework determines the best order to visit the target points to minimize the distance traveled and generates dynamically feasible trajectories while avoiding obstacles without assuming any prior knowledge of the environment. We demonstrate the results of our framework with a simulation that generates a random map with a predetermined number of waypoints to hit and show the generated trajectories.

Published
2020
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4. Broadband antireflective light-blocking layer using nanoparticle suspension in photoresist with high-resolution patterning.

Author

Hamblin, Matthew, Downing, Thane, Anderson, Sophia, Schmidt, Holger, and Hawkins, Aaron

Subjects
*LIGHT transmission, *OPTICAL devices, *VISIBLE spectra, *METAL nanoparticles, *LIGHT scattering, *SURFACE plasmon resonance
Abstract

Background: Many MEMS and optical sensor devices can benefit from layers that block transmission and suppress reflection of light across the visible spectrum. Because these devices can include complicated topography, many existing methods for depositing antireflective layers are difficult, impractical, or unusable. Aim: To create a light-blocking antireflective layer that works well with complicated MEMS and sensor devices, a layer should be made that is cheap, simple, and can be deposited and patterned with high resolution at low temperatures. Approach: Light blocking is achieved using an aluminum layer. Suppressing reflection is achieved by mixing aluminum oxide nanoparticles in photoresist to create a layer that partially absorbs and partially scatters light. Results: The combination of a layer of metal and a layer of nanoparticles and photoresist completely blocks transmission of light and significantly reduces reflections across the visible spectrum, particularly for shorter wavelengths. The layer is also patternable to sizes as small as a few microns with high resolution. Conclusion: By combining a metal layer and a layer of nanoparticles in photoresist, a simple, cheap, and effective light-blocking antireflective layer can be created that is compatible with planar devices with complex topography. [ABSTRACT FROM AUTHOR]

Published
2019
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