Application Briefs

Wireless Video Surveillance System Secures Aircraft

AgileMesh/Firetide surveillance systemAgileMeshDallas, TX972-231-2122www.agilemesh.comNASA Dryden Flight Research Center now protects several of its highly specialized research aircraft at its satellite facility with a wireless video surveillance system. The system is a product of AgileMesh, a provider of rapidly deployable video surveillance, and Firetide, a developer of wireless mesh and access networks. The AgileMesh/Firetide system secures a recently leased hangar that houses NASA’s SOFIA (Stratospheric Observatory for Infrared Astronomy) and DC- 8 Airborne Laboratory aircraft, both of which are unique to the nation.

Posted in: Application Briefs, Video, Security systems, Surveillance, Wireless communication systems, Aircraft

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Measuring LED and Solid State Lighting Performance

Light emitting diodes (LEDs) and solid state lighting (SSL) products that incorporate LEDs pose many measurement challenges compared with other lighting elements, such as traditional tungsten and fluorescent. Advanced optical radiation measurement equipment and new techniques are often required to determine basic photo-metric and colorimetric parameters for LEDs and SSL products. Updated measurement instrumentation, calibration and performance characterization methods have allowed for improvement in the repeatability and reproducibility of measurements of average LED intensity, total luminous flux and colorimetric quantities. Lower uncertainty, detector-based standards provide a convenient transfer and monitoring from primary measurement standards.

Posted in: Application Briefs, Applications, ptb catchall, Photonics, Exterior lighting, Measurements, Light emitting diodes (LEDs), Interior lighting, Radiation

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Computational Fluid Dynamics Aids Aerospace Apps

Just a few years ago, the use of computational fluid dynamics (CFD) in most aerospace companies was restricted to pure research or troubleshooting problems with existing designs. But in the past few years, newly available CFD tools are fully embedded in the mainstream mechanical design environment and hence much easier, faster and less expensive to use. The trend toward using CFD early stages in the design process has resulted in a large number of new users of this powerful analysis technique. Bell Helicopter technical specialists have developed a set of CFD best practices with the goal of guiding users in following company design guidelines and optimizing the analytical processes. The tools are based on guidelines developed for use by engineers working on propulsion systems. The guidelines are based on the application of Mentor Graphics Mechanical Analysis Division’s FloEFD suite of CFD software used by Bell Helicopter for internal flow simulations.

Posted in: Application Briefs, Motion Control, Computational fluid dynamics, Design processes, Standardization, Rotary-wing aircraft

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Coded Mask Instruments Key to HETE-2 Satellite’s Gamma-Ray Burst Discoveries

Coded optic mask foil Dynamics Research Corp. (DRC) Andover, MA 978-475-9090 www.drc.comThe High Energy Transient Explorer (HETE-2) satellite was launched into Earth orbit on October 9, 2000, and has been tracking and studying high-energy gamma-ray bursts (GRBs) from deep space. First discovered in 1967, GRBs had been difficult phenomena to observe, as they occur at random locations in the sky, last only a few seconds, and leave virtually no trace for ground-based observers. HETE-2’s ability to rapidly disseminate very precise positions of where the GRB was detected has allowed ground telescopes to catch and observe the event, leading to discoveries such as one that links GRBs with supernovas. Most of the satellite assembly occurred at Massachusetts Institute of Technology (MIT), but many subassemblies and critical components were manufactured by other institutions throughout the world.

Posted in: Application Briefs, Cameras, Data Acquisition, Architecture, Optics, Parts, Satellites

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System Provides Critical Communications Among Stennis Rocket Test Team Members

Subsystem Multiplexer (Sub-MUX) Quintron Systems Santa Maria, CA 805-928-4343 www.quintron.comNASA has awarded Quintron Systems an Indefinite-Delivery- Indefinite-Quantity (IDIQ) contract, and the first task order is for a command and control communications system that will be used at the rocket engine test stands at NASA’s Stennis Space Center in Alabama. This task order includes approximately 250 multi-channel communication key sets, of which 160 are certified for use within hazardous fuel areas.

Posted in: Application Briefs, Communications, Wireless communication systems, Collaboration and partnering, Rocket engines, Test procedures

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Computational Fluid Dynamics Aids Aerospace Apps

Just a few years ago, the use of computational fluid dynamics (CFD) in most aerospace companies was restricted to pure research or troubleshooting problems with existing designs. But in the past few years, newly available CFD tools are fully embedded in the mainstream mechanical design environment and hence much easier, faster and less expensive to use.

Posted in: Application Briefs, Aerospace, Fluid Handling

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Position Sensors Help Cameras Focus on Mars

Hall Effect position sensors Micropac Industries Garland, TX 972-272-3571 www.micropac.comMicropac’s hermetic Hall Effect devices are being used by Alliance Spacesystems, LLC and Malin Space Science Systems in camera mechanisms on the Mars Science Laboratory (MSL) Rover. Malin Space Science Systems’ Mast Camera (MastCam) and the Mars Hand-Lens Imager (MAHLI) will use focus, filter wheel, and cover mechanisms produced by Alliance Spacesystems. The Hall Effect position sensors are used in the focusing mechanisms on both cameras.

Posted in: Application Briefs, Sensors, Attitude control, Optics, Sensors and actuators

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