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  • INSTRUMENTATION AND PHOTOGRAPHY  (46)
  • 1995-1999
  • 1980-1984
  • 1975-1979  (46)
  • 1979  (46)
  • 1
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    Airborne laser induced fluorescence system for measuring OH and other trace gases in the parts-per-quadrillion to parts-per-trillion range (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Described in detail is a laser induced fluorescence system which has been successfully interfaced with two aircraft sampling platforms (i.e., Sabreliner jet and an L-188C Electra). This system, which has been under development for four years, presently consists of the following major components: (1) a Nd-Yag laser driven oscillator-amplifier dye laser; (2) a sampling manifold with associated fluorescence detection optics; (3) an OH calibration chamber; (4) a laser beam steering assembly; and (5) sampling electronics and data processing hardware. During the last three years, this system has been flown some 50,000 air miles making tropospheric OH radical measurements over the latitude range of 70 N to 57 S. OH concentrations measured during these flights have ranged from 30 parts-per-quadrillion (3.7 x 10 to the 5th molecules/sq cm) at altitudes of 6 km to 0.8 parts-per-trillion (2.0 x 10 to the 7th molecules/sq cm) at 0.5 km. Computations have been completed which indicate that the existing aircraft system with modest modifications should also be capable of detecting natural tropospheric levels of NO, SO2, CH2O, NO2, HNO2, NO3, H2O2 and CS2 by using both conventional laser-induced fluorescence methodology and multiphoton techniques.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 50; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    DSN water vapor radiometer: Tropospheric range delay calibration (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A discussion is presented of the Deep Space Network water vapor radiometer by means of simultaneous antenna temperature and radiosonde measurements at Edwards Air Force Base. The calibration of radiometer gain and hot load radiometric noise temperature is also described. Calibration equations are given. It is found that with a selected data set, the RMS error is less than 1 cm over a total delay range of 9 to 38 cm. Limitations on the use of the water vapor radiometer are also given.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: The Deep Space Network; p 136-145
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Sealed position sensitive hard X-ray detector having large drift region for all sky camera with high angular resolution (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A sealed position sensitive proportional counter filled with two atmospheres of 95% xenon and 5% methane, and containing a drift region of 24 atm cm, has operated in a stable manner for many months. The detector contains G-10 frames to support the anode and cathode wires. The detector was sealed successfully by a combination of vacuum baking the G-10 frames at 150 C for two weeks followed by assembly into the detector in an environment of dry nitrogen, and the use of passive internal getters. The counter is intended for use with a circumferential cylindrical collimator. Together they provide a very broad field of view detection system with the ability to locate cosmic hard X-ray and soft gamma ray sources to an angular precision of a minute of arc. A set of instruments based on this principle have been proposed for satellites to detect and precisely locate cosmic gamma ray bursts.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Imaging proportional counter for X-ray astronomy (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A position-sensitive proportional counter capable of imaging X-rays (0.1-3 keV) over a 10 cm x 10 cm aperture has been constructed. Positioning is obtained by sensing the signals induced by an X-ray event on the two orthogonal sets of cathode wires. Each cathode is divided into a series of cathode strips, each 0.5 cm wide. An X-ray event induces signals on several adjacent strips. Signals from each cathode strip are amplified separately and then added in an equally weighted and an unequally weighted summing amplifier. The position in each direction is obtained by dividing the output of the unequally weighted summer by that of the equally weighted summer. At 0.94 keV, the accuracy of the position sensing is 190 microns. At the same energy, the energy resolution is approximately 65% (FWHM). The proportional counter system is currently being incorporated into a sounding rocket payload having metal mirror optics, which is being constructed by the X-ray astronomy group at the California Institute of Technology.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Space optics: Imaging X-ray optics workshop; May 22, 1979 - May 24, 1979; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Thematic mapper design description and performance prediction (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The new generation of satellite-borne earth resources scanners, the Thematic Mapper, is being built for launch on the Landsat-D spacecraft. It will gather data for applications such as crop inventory, land use planning, forest management, and geology. This paper gives an overall design description, further discussion of principal design features, performance achievements where data are available, and system performance predictions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Space optics; May 22, 1979 - May 24, 1979; Huntsville, AL
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Laser velocimetry and holographic interferometry measurements in transonic flows (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Measurements of the transonic flow about a two-dimensional airfoil have been made with holographic interferometry and laser velocimetry. Quantitative data obtained with the interferometer are compared to the laser velocimeter and surface pressure measurements to evaluate the accuracy of the technique. Good agreement in the results confirmed the two-dimensionality of the flow and the potential of the interferometer in making unsteady transonic flow measurements in the future.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Laser velocimetry and particle sizing; Third International Workshop; Jul 11, 1978 - Jul 13, 1978; West Lafayette, IN
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Laser Doppler velocity measurements in subsonic, transonic, and supersonic turbulent boundary layers (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Recent measurements have used laser Doppler velocimetry to make direct measurements of the Reynolds stress in turbulent boundary layers in the Mach number range 1.5 to 3.0. A serious anomaly, however, is exhibited in these measurements in that the maximum of -u-prime v-prime occurs much farther from the wall than is reasonable for flow at constant pressure. The purpose of the present experiments was to obtain redundant data over a substantial range of Mach numbers (0.1-2.2) in an effort to resolve the anomaly in turbulent shearing stress.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Laser velocimetry and particle sizing; Third International Workshop; Jul 11, 1978 - Jul 13, 1978; West Lafayette, IN
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Investigation of a laser Doppler velocimeter system to measure the flow field around a large scale V/STOL aircraft in ground effect (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The flow field measured around a hovering 70 percent scale vertical takeoff and landing (V/STOL) aircraft model is described. The velocity measurements were conducted with a ground based laser Doppler velocimeter. The remote sensing instrumentation and experimental tests of the velocity surveys are discussed. The distribution of vertical velocity in the fan jet and fountain; the radial velocity in the wall jet and the horizontal velocity along the aircraft underside are presented for different engine rpms and aircraft height above ground. Results show that it is feasible to use a mobile laser Doppler velocimeter to measure the flow field generated by a large scale V/STOL aircraft operating in ground effect.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-152212 , LMSC-HREC-TR-D568
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Experimental study of the vidicon system for information recording using the wide-gap spark chamber of gamma - telescope gamma-I (1979)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The development of the gamma ray telescope is investigated. The wide gap spark chambers, used to identify the gamma quanta and to determine the directions of their arrival, are examined. Two systems of information recording with the spark chambers photographic and vidicon system are compared.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-75644 , PR-436
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Qualitative and quantitative flow visualization technique using ozone (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The paper describes a new flow-visualization technique based on the absorption of ultraviolet light by ozone. Ozone is an excellent tracer, because as a gas it has the same effective physical properties as air. Ozone strongly absorbs the principal line (253.7 nm) of a mercury lamp, so that when an ozone-traced flow passes between a mercury lamp and a fluorescent screen, a sharp, shadow-like image of the ozone tracer is cast on the screen. Quantitative photometry can be carried out by replacing the screen with ultraviolet detectors that yield the path-integrated column density of ozone in the flow. High-speed quantitative point monitoring (10 Hz at 10 ppb O3) is possible with capillary probes and chemiluminescent analysis.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments; 50; June 197
    Format: text
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