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  • 1
    Electronic Resource
    Electronic Resource
    Surface Acoustic Wave Oxygen Sensor (1994)
    s.l. : American Chemical Society
    Analytical chemistry 66 (1994), S. 2745-2751 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00089a023
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Gas analysis system for the Eight Foot High Temperature Tunnel (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This paper describes the development of a gas collection and analysis system that is to be installed in the Eight-Foot High Temperature Tunnel (8' HTT) at NASA's Langley Research Center. This system will be used to analyze the test gas medium that results after burning a methane-air mixture to achieve the proper tunnel test parameters. The system consists of a sampling rake, a gas sample storage array, and a gas chromatographic system. Gas samples will be analyzed after each run to assure that proper combustion takes place in the tunnel resulting in a correctly balanced composition of the test gas medium. The proper ratio of gas species is critically necessary in order for the proper operation and testing of scramjet engines in the tunnel. After a variety of methane-air burn conditions have been analyzed, additional oxygen will be introduced into the combusted gas and the enriched test gas medium analyzed. The pre/post enrichment sets of data will be compared to verify that the gas species of the test gas medium is correctly balanced for testing of air-breathing engines.
    Keywords: RESEARCH AND SUPPORT FACILITIES (AIR)
    Type: In: International Instrumentation Symposium, 38th, Las Vegas, NV, Apr. 26-30, 1992, Proceedings (A93-37851 15-35); p. 581-596.
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    An oxygen pressure sensor using surface acoustic wave devices (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Surface acoustic wave (SAW) piezoelectric devices are finding widespread applications in many arenas, particularly in the area of chemical sensing. We have developed an oxygen pressure sensor based on coating a SAW device with an oxygen binding agent which can be tailored to provide variable sensitivity. The coating is prepared by dissolving an oxygen binding agent in a toluene solution of a copolymer which is then sprayed onto the surface of the SAW device. Experimental data shows the feasibility of tailoring sensors to measure the partial pressure of oxygen from 2.6 to 67 KPa (20 to 500 torr). Potential applications of this technology are discussed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: International Instrumentation Symposium, 39th, Albuquerque, NM, May 2-6, 1993, Proceedings (A93-54351 24-35); p. 161-176.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A synchronous strobed laser light sheet for helicopter model rotor flow visualization (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A synchronous, strobed laser light sheet has been developed for use in flow visualization of a helicopter rotor model. The light sheet strobe circuit included selectable blade position, strobe duration, and multiple pulses per revolution for rotors having 2 to 9 blades. The flow was seeded with propylene glycol. Between runs, a calibration grid board was placed in the plane of the laser sheet and recorded with the video camera at the position used to record the flow field. A slip-sync mode permitted slow motion visualization of the flow field over complete rotations of the rotor. The system was used to make two-dimensional flow field cuts of a four-bladed rotor operating at advance ratio of 0.37 at wind tunnel speeds up to 79.25 meters per second (260 feet per second).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ISA Proceedings (ISSN 0227-7576); 9-22
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Development of Temperature Sensitive Paints for the Detection of Small Temperature Differences (1997)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: Temperature sensitive paints (TSP s) have recently been used to detect small temperature differences on aerodynamic model surfaces. These types of applications impose stringent performance requirements on a paint system. The TSP s must operate over a broad temperature range, must be physically robust (cannot chip or peel), must be polishable to at least the smoothness of the model surface, and must have sufficient sensitivity to detect small temperature differences. TSP coatings based on the use of metal complexes in polymer binders were developed at NASA Langley Research Center which meet most of the requirements for detection of small temperature differences under severe environmental conditions.
    Keywords: Spacecraft Propulsion and Power
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Generating A Strobed Laser Light Sheet (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An optoelectronic system generating synchronous, strobed sheet of laser light developed for use in making visible flow of air about model helicopter rotor. Used in wind-tunnel tests to determine actual locations of vortices for comparison with locations predicted by mathematical models to validate models. Each blade tip produces vortex. By establishing successive vortex locations, researcher determines trajectory of vortex pattern. Light-sheet strobe circuits provide selection of blade positions, strobe-pulse durations, and multiple pulses per revolution for rotors having two to nine blades. To make flow visible, vaporizing propylene glycol injected upstream of model. System also provides calibrated trigger delay of strobe pulses, adjustable strobe-pulse durations, selectable number of blades, and slip-sync mode to make flow visible as though in slow motion.
    Keywords: PHYSICAL SCIENCES
    Type: LAR-14556 , Laser Tech. Brief.; 2; 4; P. 106
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A twin-mirrored galvanometer laser light sheet generator (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A galvanometer mirror-based laser light sheet system has been developed for use in the Basic Aerodynamics Research Tunnel at NASA Langley. This system generates and positions single or multiple light sheets over aeronautical research models being tested in the low speed tunnel. This report describes a twin mirrored galvanometer laser light sheet generator and shows typical light sheet arrangements in use. With this system, illumination of smoke entrained in the flow over a delta wing model reveals the vortical flow produced by the separation of the flow at the leading edge of the model. The light sheet system has proven to be very adaptable and easy to use in sizing and positioning light sheets in wind tunnel applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-100587 , NAS 1.15:100587
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Arc lamp power supply using a voltage multiplier (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A power supply is provided for an arc discharge lamp which includes a relatively low voltage high current power supply section and a high voltage starter circuit. The low voltage section includes a transformer, rectifier, variable resistor and a bank of capacitors, while the starter circuit comprises several diodes and capacitors connected as a Cockcroft-Walton multiplier. The starting circuit is effectively bypassed when the lamp arc is established and serves to automatically provide a high starting voltage to re-strike the lamp arc if the arc is extinguished by a power interruption.
    Keywords: ELECTRONICS AND ELECTRICAL ENGINEERING
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Portable digital pressure indicator for calibrating magnetic tape recorders (1989)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design of a portable Digital Pressure Indicator (DPI) to be used for calibrating the pressure systems on Langley's magnetic tape recorders is described. High-speed magnetic tape recorders require pressure (0 to 20 psig) for providing an air cushion across the tape guides and a slight vacuum (30 inch H2O) for maintaining the proper number of tape loops in the advance and feed chamber. The DPI is a hand-held device that can be quickly coupled to a magnetic tape recorder and includes a two-position switch for selecting either measured pressure or vacuum, to be displayed digitally in engineering units (psig or inches H2O). The DPI is currently in use in Langley's Analysis and Computation Division.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-101650 , NAS 1.15:101650
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Pressure- and Temperature-Sensitive Paint at 0.3-m Transonic Cryogenic Tunnel (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: Recently both Pressure- and Temperature-Sensitive Paint experiments were conducted at cryogenic conditions in the 0.3-m Transonic Cryogenic Tunnel at NASA Langley Research Center. This represented a re-introduction of the techniques to the facility after more than a decade, and provided a means to upgrade the measurements using newer technology as well as demonstrate that the techniques were still viable in the facility. Temperature-Sensitive Paint was employed on a laminar airfoil for transition detection and Pressure-Sensitive Paint was employed on a supercritical airfoil. This report will detail the techniques and their unique challenges that need to be overcome in cryogenic environments. In addition, several optimization strategies will also be discussed.
    Keywords: Instrumentation and Photography
    Type: NASA/TM-2015-218801 , L-20601 , NF1676L-22330
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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