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  • 1
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    Surface pressure field mapping using luminescent coatings (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: In recent experiments we demonstrated the feasibility of using the oxygen dependence of luminescent molecules for surface pressure measurement in aerodynamic testing. This technique is based on the observation that for many luminescent molecules the light emitted increases as the oxygen partial pressure, and thus the air pressure, the molecules see decreases. In practice the surface to be observed is coated with an oxygen permeable polymer containing a luminescent molecule and illuminated with ultraviolet radiation. The airflow induced surface pressure field is seen as a luminescence intensity distribution which can be measured using quantitative video techniques. Computer processing converts the video data into a map of the surface pressure field. The experiments consisted of evaluating a trial luminescent coating in measuring the static surface pressure field over a two-dimensional NACA-0012 section model airfoil for Mach numbers ranging from 0.3 and 0.66. Comparison of the luminescent coating derived pressures were made to those obtained from conventional pressure taps. The method along with the experiment and its results will be described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Experiments in Fluids (ISSN 0723-4864); 14; 1-2; p. 33-41.
    Format: text
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  • 2
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    Status of the NASA SETI Sky Survey microwave observing project (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Sky Survey observing program is one of two complementary strategies that NASA plans to use in its microwave Search for Extraterrestrial Intelligence (SETI). The primary objective of the Sky Survey is to search the entire sky over the frequency range 1000-10,000 MHz for evidence of narrow band signals of extraterrestrial, intelligent origin. Spectrum analyzers with upwards of 10 million channels and data rates in excess of 10 gigabits per second are required to complete the survey in less than 7 years. To lay the foundation for the operational SETI Sky Survey, a prototype system has been built to test and refine real time signal detection algorithms, to test scan strategies and observatory control functions, and to test algorithms designed to reject radio frequency interference. This paper presents a high level description of the prototype hardware and reports on the preparations to deploy the system to the 34-m antenna at the research and development station of NASA's Deep Space Communication Complex, Goldstone, California.
    Keywords: SPACE SCIENCES (GENERAL)
    Type: Acta Astronautica (ISSN 0094-5765); 26; 3-4,
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    NASA TECHNICAL REPORTS
  • 3
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    Fourier transform infrared and Raman spectroscopic characterization of homogeneous solution concentration gradients near a container wall at different temperatures (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: Fourier transform infrared (FTIR) and Raman spectroscopic techniques were used to study the solution concentration gradient in succino nitrile-rich and water-rich homogeneous solutions. The spectroscopic data shows significant concentration dependency. Although FTIR-attenuated total reflectance could not yield surface spectra since the evanescent infrared wave penetrated deep into the bulk solution, it showed that water-rich clusters were decreased at higher temperatures. This result is consistent with the calorimetric results reported earlier.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-CR-188541 , NAS 1.26:188541
    Format: application/pdf
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  • 4
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    Electrostatic Microshutter Arrays (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Based on the Microshutter Array (MSA) subsystems developed at NASA Goddard Space Flight Center (GSFC) for the James Webb Space Telescope (JWST), Next Generation Microshutter Array (NGMSA) has been developed to be used as multi-object selectors for future telescopes in space applications. Microshutter arrays function as transmission devices. Selected shutters fully open at 90 degrees permitting income light going through, while the rest of shutters keep closed. The programmable microshutter open and close make the device perform as a multi object selector that can be used on space telescopes. Utilizing a multi object selector, the telescope efficiency can be increased to 100 times or more. Like JWST MSAs, NGMSA features torsion hinges, light shields, front and back electrodes for shutter actuation, latch, and closing. The difference is that JWST MSA utilized the magnetic actuation while NGMSA the electrostatic actuation.
    Keywords: Engineering (General)
    Type: GSFC-E-DAA-TN57247 , International Conference on Solid-State Sensors, Actuators and Microsystems; Jun 18, 2017 - Jun 22, 2017; Kaohsiung; Taiwan, Province of China
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  • 5
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    Study of high temperature oxide superconductors (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Experimental studies are reported whose results indicate that proper processing procedures are critical to the formation of high-temperature copper oxide superconductors. Superconducting 123 films can be fabricated using the green 211 phase as a substrate. The transition temperature and transition width characteristics of these films are better than those obtained when other oxide compounds are used as substrates. A compact or single-crystal 211 phase will be desirable as a substrate for high-quality thin films. A new high T(c) copper oxide compound with nonrare earth elements was prepared using high-temperature processing. A YBa2Cu3O7-Ag composite with improved electrical conductivity was also prepared.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Type: Sensing, Discrimination, and Signal Processing and Superconducting Materials and Instrumentation; Jan 12, 1988 - Jan 14, 1988; Los Angeles, CA; United States
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    NASA TECHNICAL REPORTS
  • 6
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    Adjustable Powder Injector For Vacuum Plasma Sprayer (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Attachment for plasma spray gun provides four degrees of freedom for adjustment of position and orientation at which powder injected externally into plasma flame. Manipulator provides for adjustment of pitch angle of injection tube: set to inject powder at any angle ranging from perpendicular to parallel to cylindrical axis. Scribed lines on extension bar and manipulator indicate pitch angle of extension tube. Collar changed to adapt injector to different gun.
    Keywords: FABRICATION TECHNOLOGY
    Type: MFS-28684 , NASA Tech Briefs (ISSN 0145-319X); 17; 7; P. 77
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  • 7
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    High-temperature processing of cuprate oxide superconductors (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Superconducting Y1Ba2Cu3O7 ('123') films were fabricated on the Y2BaCuO5 ('211') phase substrate. The superconducting characteristics of these films, in terms of superconducting transition temperature (Tc) and width, are better than those using other oxide compounds as substrates. In addition, using high-temperature processing, the bulk 211 phase was converted into the 123 phase. A new high Tc copper oxide material with non-rare-earth elements (Bi-Sr-Cu-O) was prepared using similar high-temperature processing. High-temperature processing presents an alternative synthetic route in the search of new high Tc superconductors.
    Keywords: SOLID-STATE PHYSICS
    Type: Applied Physics Letters (ISSN 0003-6951); 52; 1915-191
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