Imaging

Stereoscopic Planar Laser-Induced Fluorescence Imaging for Time-Resolved 3D Movies in Hypersonic Flow

This technique may be useful in applications where time-resolved visualization of unsteady, high-speed flows is needed, such as detonations, supersonic combustion systems, and explosions. Langley Research Center, Hampton, Virginia Understanding and predicting transition from laminar to turbulent flow in hypersonic boundary layers is an active and important field of research because transitional and turbulent heating can be four or more times higher than laminar heating on hypersonic vehicles, including the Orion Crew Exploration Vehicle (CEV).

Posted in: Briefs, Imaging, Imaging and visualization, Research and development

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Modified-Wolter-Schwarzschild X-ray Telescope

Goddard Space Flight Center, Greenbelt, Maryland X-ray survey missions require nested grazing incidence telescopes with a large field of view (1° or larger) and moderately high resolution across the field of view. This cannot be accomplished using flat focal plane detectors. The telescopes have excellent on-axis resolution, but unacceptable resolution at the edge of the field of view. The aberrations need to be optimized and correctly balanced to improve the telescope optical performance across the field of view.

Posted in: Briefs, TSP, Imaging, Optics

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Machine Vision-Based Pose Estimation System

This system uses ellipse detection for spacecraft autonomous rendezvous and docking (AR&D). Goddard Space Flight Center, Greenbelt, Maryland During on-orbit servicing of non-cooperative satellites, the relative position of the satellite with respect to the servicing vehicle is needed. Non-cooperative satellites do not have devices to assist the pose estimation (such as markers or reflector), so a system that uses the natural features of the satellite to determine its pose needs to be developed.

Posted in: Briefs, TSP, Imaging, Satellites

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Solar Doppler Shift-Based Solar Tracker

Potential applications may be in terrestrial solar thermal collectors. NASA’s Jet Propulsion Laboratory, Pasadena, California This solar tracker integrates a camera with a field of view (FOV) large enough to easily image the entire solar disc — co-boresited with a narrow-band spectrometer that measures the frequency of a Doppler shifted line — with an algorithm designed to drive zero Doppler shift rotation axis of the Sun.

Posted in: Briefs, Imaging, Mathematical models, Optics

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Beam Shaping for CARS Measurements in Turbulent Environments

This approach obtains more reliable quantitative measurements in a scramjet engine. Langley Research Center, Hampton, Virginia Taking measurements in a scramjet engine is particularly challenging because of the harsh testing environment. Any probe inserted in the flow would generate shock waves, strongly perturbing the flow. Coherent Anti-Stokes Raman spectroscopy (CARS) is a non-intrusive laser-based measurement technique that has been implemented successfully to measure temperature and species concentrations in ducted scramjet engines.

Posted in: Briefs, Imaging, Scramjet engines, Test procedures

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New Electron Microscopy Method Sculpts 3-D Structures at Atomic Level

Electron microscopy researchers at the Department of Energy’s Oak Ridge National Laboratory have developed a unique way to build 3-D structures with finely controlled shapes as small as one to two billionths of a meter. The new technique demonstrates how scanning transmission electron microscopes, normally used as imaging tools, are also capable of precision sculpting of nanometer-sized 3-D features in complex oxide materials.

Posted in: Articles, News, Imaging

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Onion-Like Layers Help New Nanoparticle Glow

A new, onion-like nanoparticle could open new frontiers in bioimaging, solar energy harvesting and light-based security techniques.

Posted in: Articles, News, Energy, Solar Power, Imaging

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High-Speed ‘Electron Camera’ Captures Motion — One Quadrillionth of a Second at a Time

Using a method known as ultrafast electron diffraction (UED), a scientific instrument at the Department of Energy’s SLAC National Accelerator Laboratory, located in Menlo Park, CA, reveals nature’s high-speed processes, including phase changes and the motions of electrons and atomic nuclei within molecules.

Posted in: Articles, Imaging, Imaging and visualization

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Finding the Right Lens: The Factors to Focus On

A sharp image requires more than just a good camera; it also takes the right lens. Several aspects must be considered to make sure that the camera and lens work perfectly together and fit a specific application.

Posted in: Articles, Imaging, Imaging and visualization

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From 2D to 3D: MARVEL Tool Offers Immersive View Inside the Brain

Thanks to a partnership between a surgeon and NASA’s Jet Propulsion Laboratory (JPL), a new camera system could improve minimally invasive surgeries and provide 3D endoscopic images of the brain.

Posted in: Application Briefs, Articles, Imaging, Imaging and visualization, Medical, health, and wellness

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