Briefs: Information Technology
Reactive Collision Avoidance Algorithm

The reactive collision avoidance (RCA) algorithm allows a spacecraft to find a fuel-optimal trajectory for avoiding an arbitrary number of colliding spacecraft in real time while accounting for acceleration limits. In addition to spacecraft, the technology can be used for vehicles that can accelerate in any...

Briefs: Information Technology
Modeling Common-Sense Decisions in Artificial Intelligence

A methodology has been conceived for efficient synthesis of dynamical models that simulate common-sense decision-making processes. This methodology is intended to contribute to the design of artificial-intelligence systems that could imitate human commonsense decision making or assist...

Briefs: Physical Sciences
Graph-Based Path-Planning for Titan Balloons

A document describes a graph-based path-planning algorithm for balloons with vertical control authority and little or no horizontal control authority. The balloons are designed to explore celestial bodies with atmospheres, such as Titan, a moon of Saturn. The algorithm discussed enables the balloon to...

Briefs: Physical Sciences
Nanolaminate Membranes as Cylindrical Telescope Reflectors

A document discusses a proposal to use axially stretched metal nanolaminate membranes as lightweight parabolic cylindrical reflectors in the Dual Anamorphic Reflector Telescope (DART) — a planned spaceborne telescope in which the cylindrical reflectors would be arranged to obtain a...

Briefs: Information Technology
Fast Solution in Sparse LDA for Binary Classification

An algorithm that performs sparse linear discriminant analysis (Sparse-LDA) finds near-optimal solutions in far less time than the prior art when specialized to binary classification (of 2 classes). Sparse-LDA is a type of feature- or variable-selection problem with numerous applications in...

Briefs: Physical Sciences
Air-Sea Spray Airborne Radar Profiler Characterizes Energy Fluxes in Hurricanes

A report discusses ASAP (Air-sea Spray Airborne Profiler), a dual-wavelength radar profiler that provides measurement information about the droplet size distribution (DSD) of sea-spray, which can be used to estimate heat and moisture fluxes for hurricane research....

Briefs: Physical Sciences
Large Telescope Segmented Primary Mirror Alignment

A document discusses a broadband (white light) point source, located at the telescope Cassegrain focus, which generates a cone of light limited by the hole in the secondary mirror (SM). It propagates to the aspheric null-mirror, which is optimized to make all the reflected rays to be normal to...

Briefs: Physical Sciences
Simplified Night Sky Display System

A document describes a simple night sky display system that is portable, lightweight, and includes, at most, four components in its simplest configuration. The total volume of this system is no more than 106 cm3 in a disassembled state, and weighs no more than 20 kilograms. The four basic...

Who's Who: Aerospace

Robert Lightfoot Jr. began his career with NASA in 1989 as a test engineer and program manager for the space shuttle engine technology testbed program and the Russian RD-180...

Podcasts
Robert M. Lightfoot Jr., Director, Marshall Space Flight Center

Robert Lightfoot Jr. began his career with NASA in 1989 as a test engineer and program manager for the space shuttle engine technology testbed program and the Russian RD-180 engine testing program. In 2002 he was named director of the Propulsion Test Directorate at Stennis...

Articles: Photonics/Optics

Fiber optic interconnects have enjoyed a relatively long history in long haul telecommunications due to their ability to transmit large quantities of data across great distances. As our...

Application Briefs: Photonics/Optics

A turbine manufacturer wanted to get more power out of hundreds of turbines that were originally built and installed in the 1950s. The basic idea was to use the original outer casing but...

Application Briefs: Photonics/Optics
Widely Tunable Mode-Hop-Free External-Cavity Quantum Cascade Laser

The external-cavity quantum cascade laser (EC-QCL) system is based on an optical configuration of the Littrow type. It is a room-temperature, continuous- wave, widely tunable, mode-hop-free, mid-infrared, EC-QCL spectroscopic source. It has a single-mode tuning range of 155...

Application Briefs: Photonics/Optics

This design constitutes a self-resetting (gain quenching), room-temperature operational semiconductor single-photon-sensitive detector that is sensitive to...

Application Briefs: Photonics/Optics

A method of determining the refractive and absorptive properties of optically transparent materials involves a combination of theoretical and experimental analysis of electromagnetic...

Products: Photonics/Optics

The high-sensitivity IK-TF7 3CCD camera from Toshiba Imaging Systems (Irvine, CA) has been integrated into the new Micron III retinal imaging microscope, developed by Phoenix Research Labs...

Products: Photonics/Optics

LightTools® 7.0 illumination design and analysis software from Optical Research Associates (ORA®) (Pasadena, CA) supports Windows 7 and delivers expanded capabilities for both model construction and system...

Products: Photonics/Optics

Resolve Optics (Chesham, UK) has introduced rugged lenses designed to meet and exceed environmental tests such as Def Stan 00-35 which includes vibration, shock, and bump testing over a temperature range of -40 °C to 70 °C....

Products: Photonics/Optics

Titan Tool Supply (Buffalo, NY) has introduced the VJ7X1.5 articulating video boreoscope featuring onboard (standalone) image processing and battery-powered, portable operation. It has a high-resolution 2.4-inch...

Products: Photonics/Optics

Cal Sensors (Santa Rosa, CA) has launched a line of IDA (Integrated Detector Assembly) lead selenide and lead sulfide high-sensitivity infrared detectors with integrated electronics enclosed within a...

Products: Photonics/Optics

The IM-6000 Series image dimension measurement system from Keyence Corp. (Woodcliff Lake, NJ) includes an Intelligent Pattern Analysis Search System (iPASS) that locates, identifies, and measures parts...

Products: Photonics/Optics

The id400 from id Quantique (Geneva, Switzerland) is a photon counting module optimized for 1064nm wavelength. It includes an In-GaAsP/InP avalanche photodiode optimised for Geiger mode and a fast...

Products: Photonics/Optics

VueMetrix (Martinsried, Germany) has introduced Vue-TEC-15 and Vue-TEC-24 temperature controllers that are microprocessor- controlled and feature advanced fault diagnostics, user-settable operational limits, and an...

Products: Photonics/Optics

Mouser Electronics (Mansfield, TX) now stocks OSRAM Opto Semiconductors’ OSLON SX LED series, mounted on an SMD ceramic LED package. The LEDs feature a 60° focused beam and are housed in a 3mm × 3mm package, with a life of...

Products: Photonics/Optics

The CS405 and CS445 series blue laser diodes from Laser Components (Hudson, NH) are available in 405nm and 445nm wavelengths. They feature a stable beam profile, low noise level, minimal current consumption, and long...

Products: Photonics/Optics

Cole-Parmer (Veronon Hills, IL) offers a digital microscope that plugs into the USB port of PCs and laptops to view images with 10× up to 500× magnification. It features a polarizer to reduce glare on reflective...

Products: Photonics/Optics
Step-Down DC/DC Converter

Linear Technology (Milpitas, CA) has announced the LT3743, a synchronous step-down DC/DC converter designed to deliver constant current to drive high current LEDs. The device’s 5.5V to 36V input voltage range makes it suitable for applications including industrial, DLP projection, and architectural lighting. It...

Products: Photonics/Optics

Dover, A Danaher Motion Company (Salem, NH), has introduced the MMG Mini-Mag line of precision linear motor stages. Four models are available that deliver 25mm, 50mm, 100mm, and 150mm travel, respectively. They...

Products: Photonics/Optics

Lincoln Laser Company (Phoenix, AZ) has introduced the KW Series polygonal laser scanner for material processing applications. The scanner uses a solid copper polygonal mirror that rotates to allow the laser beam to...

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