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  • 1
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    Stable vacuum UV CCD detectors designed for space flight experiments (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Thinned, backside-illuminated, p-channel CCD images are under development which can exploit the surface potential in VUV applications, yielding enhanced quantum efficiency to wavelengths as short as 1100 A. The current goal is production of large-format, 5-micron pixel imagers for spectrographic and imaging VUV spaceflight experiments. Model predictions of the effect of device design on quantum efficiency, well capacity, and crosstalk are presented for such 5-micron-approaching pixel sizes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Ultraviolet technology IV; Proceedings of the Meeting, San Diego, CA, July 20, 21, 1992 (A93-34426 13-35); p. 231-239.
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    NASA TECHNICAL REPORTS
  • 2
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    The development of hydrogen sensor technology at NASA Lewis Research Center (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The detection of hydrogen leaks in aerospace applications, especially those involving hydrogen fuel propulsion systems, is of extreme importance for reasons of reliability, safety, and economy. Motivated by leaks occurring in liquid hydrogen lines supplying the main engine of the Space Shuttle, NASA Lewis has initiated a program to develop point-contact hydrogen sensors which address the needs of aerospace applications. Several different approaches are being explored. They include the fabrication of PdAg Schottky diode structures, the characterization of PdCr as a hydrogen sensitive alloy, and the use of SiC as a semiconductor for hydrogen sensors. This paper discusses the motivation behind and present status of each of the major components of the NASA LeRC hydrogen sensor program.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-106141 , E-7773 , NAS 1.15:106141 , Annual Space System Health Management Technology Conference; Nov 17, 1992 - Nov 18, 1992; Cincinnati, OH; United States
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  • 3
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    The development of hydrogen sensor technology for aerospace applications (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The motivation and present status of each of the major components of the NASA Lewis Research Center hydrogen sensor program. The testing facility used to test the sensors and the proposed expansion of this facility are discussed. The Schottky diode prototype sensors, the use of SiC as a semiconductor for a hydrogen sensor, and the present characterization of PdCr are addressed. Future directions for the program are examined. It is concluded that results thus far are encouraging and that further development work is necessary.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 93-2375 , AIAA, SAE, ASME, and ASEE, Joint Propulsion Conference and Exhibit; Jun 28, 1993 - Jun 30, 1993; Monterey, CA; United States|; 11 p.
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    NASA TECHNICAL REPORTS
  • 4
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    The Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: AVIRIS is a facility consisting of a flight system, a ground data system, a calibration facility, and a full-time operations team. The facility was developed by JPL under funding from NASA. NASA also provides funding for operations and maintenance. The flight system is a whisk-broom imager that acquires data in 224 narrow, contiguous spectral bands covering the solar reflected portion of the electromagnetic spectrum. It is flown aboard the NASA high altitude ER-2 research aircraft. The ground data system is a facility dedicated to the processing and distribution of data acquired by AVIRIS. It operates year round at JPL. The calibration facility consists of a calibration laboratory at JPL and a suite of field instruments and procedures for performing inflight calibration of AVIRIS. A small team of engineers, technicians, and scientists supports a yearly operations schedule that includes 6 months of flight operations, 6 months of routine ground maintenance of the flight system, and year-round data processing and distribution. Details of the AVIRIS system, its performance history, and future plans are described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Remote Sensing of Environment (ISSN 0034-4257); 44; 2-3; p. 127-143.
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  • 5
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    Modelling, calibration, and error analysis of seven-hole pressure probes (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: This report describes the calibration of a nonnulling, conical, seven-hole pressure probe over a large range of flow onset angles. The calibration procedure is based on the use of differential pressures to determine the three components of velocity. The method allows determination of the flow angle and velocity magnitude to within an average error of 1.0 deg and 1.0 percent, respectively. Greater accuracy can be achieved by using high-quality pressure transducers. Also included is an examination of the factors which limit the use of the probe, a description of the measurement chain, an error analysis, and a typical experimental result. In addition, a new general analytical model of pressure probe behavior is described, and the validity of the model is demonstrated by comparing it with experimentally measured calibration data for a three-hole yaw meter and a seven-hole probe.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Experiments in Fluids (ISSN 0723-4864); 14; 1-2; p. 104-120.
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  • 6
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    Results from a Si(Li) gamma ray detector stack for future Mars missions (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We present Monte Carlo analysis and experimental data from a novel lithium-drifted silicon detector stack for gamma ray spectroscopy instrumentation in future Mars surface landers and other planetary missions. The Monte Carlo analysis shows full energy photopeaks even in the range of about 100 keV to 2 MeV where, in Si, Compton scattering dominates the absorption processes. Laboratory data is shown for an experimental detector stack of four planar Si(Li) devices, each 5 mm thick with an active area 2 cm in diameter. All the experimental data were collected with maximum temperature of the stack at 175 K. Background reduction is achieved by using the detector of the stack closest to the source in anticoincidence. We present a comparison of experimental data from the stack with the Monte Carlo model for Cs-137 (662 keV). Agreement is shown to be good, with a full energy photopeak clearly seen (FWHM about 10 keV). Experimental stack data is also shown for multiple peaks at 511 keV (Na-22) and 662 keV (Cs-137). The peaks are clearly resolved (FWHM 10 keV), and are compared with the results obtained using a 8 percent resolution, 3 in. x 3 in. NaI(TI) device (FWHM about 50 keV).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); 39; 4; p. 981-986.
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  • 7
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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.
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    NASA TECHNICAL REPORTS
  • 8
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    Remote semi-continuous flow rate logging seepage meter (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The movement of groundwater and its associated solutes from upland regions was implicated in the degradation of receiving surface water bodies. Current efforts to directly measure this influx of water incorporate manually operated seepage meters which are hindered by severe limitations. A prototype seepage meter was developed by NASA Langley Research Center and Virginia Polytechnic Institute and State University that will allow for the semi-continuous collection and data logging of seepage flux across the sediment water interface. The meter is designed to operate at depths to 40 meters, and alleviate or minimize all disadvantages associated with traditional methods while remaining cost effective. The unit was designed to operate independently for time periods on the order of weeks with adjustable sample sequences depending upon hydrologic conditions. When used in conjunction with commercially available pressure transducers, this seepage meter allows for correlations to be made between groundwater discharge and tidal/sea state conditions in coastal areas. Field data from the Chesapeake Bay and Florida Bay systems are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA, Washington, Technology 2001: The Second National Technology Transfer Conference and Exposition, Volume 2; p 445-451
    Format: application/pdf
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  • 9
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    GOMOS: Gobal Ozone Monitoring by Occultation of Stars (1994)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: In this paper we report on the progress and status of the Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument, and imaging spectrometer under development for flight on the European Space Agency's Polar Orbiting Earth Mission (POEM-1) mission in 1998. Employing occultation of stars as a light probe of the Earth's atmosphere from a sun-sychronous polar orbit, the instrument will monitor ozone and other atmospheric trace gases over the entire globe. Atmospheric transmission resolution of approximately 1.7 km. When data are combined regionally, it will be possible to detect ozone concentration trends as small as 0.05 percent/year, depending on the degree of combination.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 2; p 950-953
    Format: application/pdf
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  • 10
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    Design of an automated imaging system for use in a space experiment (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: An experiment, occurring in an orbiting platform, examines the mass transfer across gas-liquid and liquid-liquid interfaces. It employs an imaging system with real time image analysis. The design includes optical design, imager selection and integration, positioner control, image recording, software development for processing and interfaces to telemetry. It addresses the constraints of weight, volume, and electric power associated with placing the experiment in the Space Shuttle cargo bay. Challenging elements of the design are: imaging and recording of a 200-micron-diameter bubble with a resolution of 2 microns to serve a primary source of data; varying frame rates from 500 per second to 1 frame per second, depending on the experiment phase; and providing three-dimensional information to determine the shape of the bubble.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: CAN-AM Eastern '90; Proceedings of the 1st Canadian-American Eastern Regional Conference on Applications of Optical Engineering, Rochester, NY, Oct. 4, 5, 1990 (A93-20453 06-35); p. 52-60.
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