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  • 1
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    Operational overview of Wallops Island instrument intercomparison - Carbon monoxide, nitric oxide, and hydroxyl instrumentation (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: NASA has initiated the Global Tropospheric Experiment (GTE) for the study of the chemistry of the global troposphere. One phase of GTE, Chemical Instrumentation Test and Evaluation (CITE), is concerned with the development and validation of measurement techniques for trace species which play important roles in the tropospheric chemical cycles. In connection with CITE 1 an intercomparison of instruments is conducted for the measurement of CO, NO, and OH. These species have been identified as critical for an understanding of homogeneous gas-phase chemistry in the troposphere. The present paper provides an operational overview of the first of three instrument intercomparison field missions conducted as part of GTE/CITE 1. The missions include one ground-based and two airborne missions, and were designed to characterize current capability of measuring ambient levels of CO, NO, and OH.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 12
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  • 2
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    Radiometric responsivity determination for Feature Identification and Location Experiment (FILE) flown on space shuttle mission (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A procedure was developed to obtain the radiometric (radiance) responsivity of the Feature Identification and Local Experiment (FILE) instrument in preparation for its flight on Space Shuttle Mission 41-G (November 1984). This instrument was designed to obtain Earth feature radiance data in spectral bands centered at 0.65 and 0.85 microns, along with corroborative color and color-infrared photographs, and to collect data to evaluate a technique for in-orbit autonomous classification of the Earth's primary features. The calibration process incorporated both solar radiance measurements and radiative transfer model predictions in estimating expected radiance inputs to the FILE on the Shuttle. The measured data are compared with the model predictions, and the differences observed are discussed. Application of the calibration procedure to the FILE over an 18-month period indicated a constant responsivity characteristic. This report documents the calibration procedure and the associated radiometric measurements and predictions that were part of the instrument preparation for flight.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-89017 , L-16180 , NAS 1.15:89017
    Format: application/pdf
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  • 3
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    Evaluation of concepts and methods for extraction of flow parameters from laser transit anemometry data (1988)
    In:  Other Sources
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    Publication Date: 2018-12-01
    Description: A Monte-Carlo type simulation system was developed to test concepts and associated algorithms proposed by Mayo and Smart (1984) for the extraction of two-dimensional flow parameters from laser transit anemometry data sets. The Monte-Carlo LTA simulation program models a flow field as well as the sample volume geometry of the LTA system, thereby permitting simulation of two-dimensional data acquisition in a three-dimensional flow field. The results of these tests on the proposed processing concepts suggest that the instrument is capable of measuring mean velocities to less than +0.15 percent error and flow angles to less then +0.3 percent for turbulence intensities of up to 15.0 percent.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 4
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    Development of a new laser Doppler velocimeter for the Ames High Reynolds Channel No. 2 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A new two-channel laser Doppler velocimeter developed for the Ames High Reynolds Channel No. 2 is described. Design features required for the satisfactory operation of the optical system in the channel environment are discussed. Fiber optics are used to transmit the megahertz Doppler signal to the photodetectors located outside the channel pressure vessel, and provision is made to isolate the optical system from pressure and thermal strain effects. Computer-controlled scanning mirrors are used to position the laser beams in the channel flow. Techniques used to seed the flow with 0.5-micron-diam polystyrene spheres avoiding deposition on the test-section windows and porous boundary-layer removal panels are described. Preliminary results are presented with a discussion of several of the factors affecting accuracy.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-86772 , REPT-85289 , NAS 1.15:86772
    Format: application/pdf
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  • 5
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    Estimating laser transit anemometry noise performance capabilities (1989)
    In:  Other Sources
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    Publication Date: 2019-07-27
    Description: A Monte Carlo based LTA (laser transit anemometry) simulation system has been used to perform a detailed evaluation of a set of processing algorithms proposed by Mayo and Smart (1984) for the extraction of two-dimensional flow parameters from LTA data sets collected in a plane normal to the optical axis of the system. The present evaluation includes data ensembles containing 0.0, 5.0, 10.0, and 20.0 percent background noise levels in the constituent correlograms. The results of these evaluations indicate that for turbulence levels of up to 10.0 percent the processing system is able to extract the necessary flow parameters accurately from the LTA data sets. Mean velocity magnitude and flow angle are measurable to within 2.0 percent for turbulence intensity levels of up to 14.0 percent. Standard deviations are measureable to within 10.0 percent over a turbulence range of 3.0-10.0 percent at the same noise levels. These results indicate that the algorithms described have applications in fluid flow surveys.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ICIASF ''89; Sept. 18-21, 1989; Goettingen; Germany
    Format: text
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  • 6
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    Wind Tunnel Seeding Systems for Laser Velocimeters (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The principal motivating factor for convening the Workshop on the Development and Application of Wind Tunnel Seeding Systems for Laser Velocimeters is the necessity to achieve efficient operation and, most importantly, to insure accurate measurements with velocimeter techniques. The ultimate accuracy of particle scattering based laser velocimeter measurements of wind tunnel flow fields depends on the ability of the scattering particle to faithfully track the local flow field in which it is embedded. A complex relationship exists between the particle motion and the local flow field. This relationship is dependent on particle size, size distribution, shape, and density. To quantify the accuracy of the velocimeter measurements of the flow field, the researcher has to know the scattering particle characteristics. In order to obtain optimum velocimeter measurements, the researcher is striving to achieve control of the particle characteristics and to verify those characteristics at the measurement point. Additionally, the researcher is attempting to achieve maximum measurement efficiency through control of particle concentration and location in the flow field.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CP-2393 , L-16013 , NAS 1.55:2393 , Mar 19, 1985 - Mar 20, 1985; Hampton, VA; United States
    Format: application/pdf
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  • 7
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    Laser transit anemometer experiences in supersonic flow (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The purpose of this paper is to present examples of velocity measurements obtained in supersonic flow fields with the laser transit anemometer system. Velocity measurements of a supersonic jet exhausting in a transonic flow field, a cone boundary survey in a Mach 4 flow field, and a determination of the periodic disturbance frequencies of a sonic nozzle flow field are presented. Each of the above three cases also serves to illustrate different modes of laser transit anemometer operation. A brief description of the laser transit anemometer system is also presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Supersonic Tunnel Association, Semiannual Meeting; Oct 11, 1988 - Oct 12, 1988; Preston; United Kingdom|; 15 p.
    Format: text
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  • 8
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    Monochromatic X-ray and XUV imaging with multilayer optics (1988)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The development of techniques for the fabrication of multilayer coated mirrors which can function as energy selective X-ray and XUV mirrors at normal incidence has greatly expanded the options available to the astronomical spectroscopist. A rocket spectroheliograph which utilizes multilayer optics in three configurations has been developed. These are: (1) as Cassegrain telescopes for imaging at 256 A (He II) and 173 A (Fe IX, X); (2) as tertiary mirrors used with a conventional Wolter I telescope for imaging at 44 A (Si XI, XII), 173 A, and 256 A; and (3) as off-axis spherical mirrors for imaging at 44 A and 256 A. The paper reports on laboratory images and performance measurements obtained with these optical systems, and briefly on Solar Observations.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Supplement (ISSN 0449-1947); 49; C1-175 t
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  • 9
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    Development of a normal incidence multilayer, imaging X-ray microscope (1989)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper describes the design, analysis, and fabrication of a normal-incidence multilayer 20x Schwarzschild imaging X-ray microscope. The microscope is being fabricated using much of the technology implemented in the Multispectral Solar Telescope Array. Results of diffraction analysis show that better than 400 A spatial resolution in the object plane up to a 1-mm field of view can be achieved with 125 A radiation. Other microscope systems for use in conjunction with X-ray telescopes are analyzed and designed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: X-ray/EUV Optics for Astronomy and Microscopy; Aug 07, 1989 - Aug 11, 1989; San Diego, CA; United States
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  • 10
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    Soft X-ray/extreme ultraviolet images of the solar atmosphere with normal incidence multilayer optics (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: High-resolution images of the sun in the soft-X-ray/XUV range have been obtained with normal-incidence multilayer coated optics (MCOs) during a sounding-rocket flight on October 23, 1987 from White Sands. MCOs were used in two Cassegrain telescopes, as off-axis primary mirrors, and as tertiary mirrors operating with a Wolter-Schwarzschild (WS) grazing-incidence mirror. The inherent energy-selective property of MCOs allowed distinct groups of emission lines to be isolated in the solar corona and the transition region. Images were recorded at 173 and 256 A with the Cassegrain telescopes, at 256 A with a Herschelian telescope, and at 44, 173, and 256 A with the WS hybrid telescope. In addition, soft-X-ray images in the 8-18-A bandpass were obtained at the prime focus of the WS optics. The images show many features of the solar corona and transition region, including magnetically confined loops of hot solar plasma, coronal plumes, polar coronal holes, supergranulation, and features associated with overlying cool prominences.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: X-Ray Instrumentation in Astronomy II; Aug 15, 1988 - Aug 17, 1988; San Diego, CA; United States
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