Tech Briefs

Deep UV Discharge Lamps in Capillary Quartz Tubes with Light Output Coupled to an Optical Fiber

NASA’s Jet Propulsion Laboratory, Pasadena, California Researchers at Jet Propulsion Laboratory have come up with a novel approach to the simplification of the 194-nm light source and optical guidance in mercury trapped ion spectroscopy research. Mercury plasma is generated in a capillary tube with a diameter of a few hundred microns (in contrast to current lamp bulbs with a diameter of 13 mm). The deep ultraviolet (DUV) light from the plasma can be guided directly to the ions held in an ion trap in a vacuum system via a piece of DUV fiber that is fused at the end of the capillary tube.

Posted in: Physical Sciences, Briefs

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Speech Acquisition and Automatic Speech Recognition for Integrated Spacesuit Audio Systems, Version II

System offers superior performance from prior version, and a number of commercial applications. John H. Glenn Research Center, Cleveland, Ohio Astronauts suffer from poor dexterity of their hands due to the clumsy spacesuit gloves during Extravehicular Activity (EVA) operations, and NASA has had a widely recognized but unmet need for novel human-machine interface technologies to facilitate data entry, communications, and robots or intelligent systems control. A speech interface driven by an astronaut’s own voice is ideal for EVA operations, since speech is the most natural, flexible, efficient, and economical form of human communication and information exchange.

Posted in: Physical Sciences, Briefs

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Advanced Sensor Technology for Algal Biotechnology

Ames Research Center, Moffett Field, California Advanced Sensor Technology for Algal Biotechnology (ASTAB) is an integrated package of water quality and algal physiology sensors designed to enable algae growers to increase significantly productivity and efficiency of their operations, optimize harvesting periods, and avoid losses of “batches” of algae through nutrient deficiencies and/or population shifts. This sensor technology is expected to increase process automation and performance in large-scale algal production facilities.

Posted in: Physical Sciences, Briefs

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High-Speed Spectral Mapper

NASA’s Jet Propulsion Laboratory, Pasadena, California The Hyperspectral Infrared Imager (HyspIRI) spaceborne mission has two imaging sensors operating in the visible to shortwave infrared (VSWIR) and the thermal infrared (TIR), respectively. The HyspIRI-TIR imaging instrument is being developed for infrared mapping of the Earth in 8 spectral bands with a 5-day revisit time at the equator. The system will have 60-m ground resolution at nadir, 200-mK noise-equivalent temperature difference (NETD) for 300 K scenes, and 0.5 ºC absolute temperature accuracy. As the spacecraft moves in its polar orbit, a rotating scan mirror allows the telescope to view a 51º cross-track nadir strip, an internal blackbody target, and space, every 2.1 s. Combining the overlapping strips will yield a 51º (597-km) wide swath below the spacecraft.

Posted in: Physical Sciences, Briefs

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“Ascent - Commemorating Shuttle” — A NASA Film and Multimedia Project DVD

The production has demonstrated itself not only to be a technical record, but to also serve as an inspirational, motivational, and educational tool. John H. Glenn Research Center, Cleveland, Ohio NASA seeks to preserve, and make readily accessible, historical Space Shuttle launch footage to inspire and educate NASA stakeholders both in and outside the NASA family through the dissemination of the Ascent production materials as a DVD, and through both NASA Television and online social media avenues without incurring distribution and media costs.

Posted in: Information Sciences, Electronics & Computers, Briefs

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High-Pressure, Reduced-Kinetics Mechanism for N-Hexadecane Oxidation

NASA’s Jet Propulsion Laboratory, Pasadena, California Combustion of realistic fuels is described by thousands of reactions involving thousands of species. Coupling these detailed chemical mechanisms with turbulence simulations is completely impractical because there is no computer powerful enough to solve the resulting equations.

Posted in: Information Sciences, Electronics & Computers, Briefs

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Method of Error Floor Mitigation in Low-Density Parity-Check Codes

NASA’s Jet Propulsion Laboratory, Pasadena, California Low-density parity-check (LDPC) codes often suffer from an “error floor” in which increasing signal-to-noise ratios do not lead to substantially better error rate performance. Error floors of LDPC codes are often not an inherent problem of the code design, but rather, a limitation of the standard decoding algorithms.

Posted in: Information Sciences, Electronics & Computers, Briefs

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