Articles

Hyperspectral Sensing for Defense and Security Applications

The successful exploitation of hyperspectral imaging sensors depends on the availability of accurate and complete spectral signature libraries. Coupled with the appropriate spectral signature library, images collected with hyperspectral sensors provide the means to survey large areas identifying and characterizing materials, detecting a wide range of camouflaged targets, and detecting disturbed surfaces.

Posted in: Articles, Features, Photonics

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Ion Thruster System Powers Spacecraft to Deep-Space Destinations

Ion thruster system and power processing units Aerojet Rocketdyne Sacramento, CA 916-355-4000 www.rocket.com Aerojet Rocketdyne is developing NASA’s Evolutionary Xenon Thruster-Commercial (NEXT-C) Gridded Ion Thruster System. Managed at NASA’s John H. Glenn Research Center, the NEXT-C Gridded Ion Thruster System is designed to power government and commercial spacecraft to deep-space destinations faster, farther, and more fuel efficiently than any other propulsion technology currently available.

Posted in: Application Briefs, Articles

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System Tests Flight Control of Dream Chaser Spacecraft

DynoLAB™ data acquisition and control system SAKOR Technologies Okemos, MI 517-332-7256 www.sakor.com SAKOR Technologies has supplied a test system to Southwest Research Institute® (SwRI®) to be used to test the atmospheric flight control system for the Dream Chaser® spacecraft. Dream Chaser is a lifting-body, reusable, crewed or uncrewed vehicle. It is owned and operated by Sierra Nevada Corporation (SNC), and is designed as a space utility vehicle for low-Earth orbit.

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High-Performance Data Acquisition on USB

A common belief among engineers is that in order to get the best performance, a PC-based data acquisition module must plug into the PCI bus. Properly implemented, however, a data acquisition module can use the PC’s USB port to pump data into a PC as fast as PCI-based cards. The keys to achieving this performance are a hardware USB interface on the module, and optimized driver software for the host system.

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Generating Broadband Terahertz Radiation from Microplasma in Air

Researchers at the University of Rochester’s Institute of Optics have shown that a laser-generated microplasma in air can be used as a source of broadband terahertz radiation. Fabrizio Buccheri and Xi-Cheng Zhang recently demonstrated that an approach for generating terahertz waves using intense laser pulses in air – first pioneered in 1993 – can be done with much lower power lasers, a major challenge until now.

Posted in: Articles, Briefs

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Scientists Use X-Ray Laser to Track Ultrafast Creation of a Catalyst

An international team has, for the first time, precisely tracked the surprisingly rapid process by which light rearranges the outermost electrons of a metal compound and turns it into an active catalyst – a substance that promotes chemical reactions. The research, which was performed with an X-ray laser at the Department of Energy’s SLAC National Accelerator Laboratory, could help in the effort to develop novel catalysts to efficiently produce fuel using sunlight.

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High-Power Laser Spinoff Proves Versatility is Strength

Since lasers were invented in 1960, they have penetrated countless scientific, industrial and recreational fields from eye surgery to DVD players, from cutting steel to triggering ignition in missile stages. That last use is a target market for Alfalight, a University of Wisconsin-Madison spinoff that set out in 1999 to use patented technology to make lasers for the telecommunications industry. At the time, "a tremendous need was forecast for these high-power, reliable lasers in telecom," says Ron Bechtold, Alfalight's vice president of marketing and sales.

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