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  • 1
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    1986 Nuclear Science Symposium, 33rd, and 1986 Symposium on Nuclear Power Systems, 18th, Washington, DC, Oct. 29-31, 1986, Proceedings (1987)
    In:  Other Sources
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    Publication Date: 2016-03-09
    Description: Papers are presented on space, low-energy physics, and general nuclear science instrumentations. Topics discussed include data acquisition systems and circuits, nuclear medicine imaging and tomography, and nuclear radiation detectors. Consideration is given to high-energy physics instrumentation, reactor systems and safeguards, health physics instrumentation, and nuclear power systems.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: (ISSN 0018-9499)
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  • 2
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    Boundary layer measurements on an airfoil in cascade using laser Doppler anemometry (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Laser Doppler anemometry (LDA) was used to obtain detailed boundary layer data at 89.3 percent chord on the pressure surface of a double circular arc compressor blade in cascade. The measurements were taken at a chord Reynolds number of 5.0 x 10 to the 5th and a cascade angle of 53 degrees. The mean velocity, local turbulence intensity, skewness, and kurtosis were determined from the measured velocity probability distributions. The mean velocity profile and the local turbulence intensity profile had classical shapes. Also, the skewness and kurtosis had commonly observed shapes through out the boundary layer, reaching maximum values for Y/delta between 0.5 and 1.1 and Gaussian values for Y/delta greater than 1.1. A comparison was made between data taken with and without the Bragg cell and no significant differences were found.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 86-0072
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  • 3
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    Theory and applications of optical fiber lever sensors (1989)
    In:  CASI
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    Publication Date: 2019-06-28
    Description: The evolution of optical fiber lever concepts is illustrated leading to several designs found useful in air and water applications. In particular, this technology has led to the development of underwater detectors of the pressure and pressure gradient kind. In addition, an optical microphone with features not found in condenser microphones has been utilized in the measurement of pressure fluctuations in high speed boundary layers requiring sensors of small size, extended bandwidth, wide dynamic range, and high temperature capability. Finally, similar concepts have been applied to the design of scale model acoustic arrays intended for acoustic imaging applications in the megahertz frequency range.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-185344 , NAS 1.26:185344
    Format: application/pdf
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  • 4
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    On stereo viewing of SAR images (1985)
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    Publication Date: 2019-06-28
    Description: Stereo viewing is indispensable for the measurement of homologue points in two overlapping images and the subsequent reconstruction of the three-dimensional topographic relief. Aspects of stereo viewing geometry are discussed along with problems of radar stereoscopy, taking into account stereo evaluation with an exaggeration factor, the viewability of real images, and radar stereoscopic computations. Attention is given to the definition of radar stereoscopic exaggeration, questions of image simulation, and the accuracy obtained with parallax measurements in radar images. An evaluation with a large set of about 40 radar stereo models demonstrates that same-side arrangements provide good stereo viewability. This result was confirmed for aircraft radar with look angles off-nadir of 60-80 deg and intersection angles between 0.2 deg and 23 deg, and for satellite radar (Seasat) with look angles of 20 deg and interaction angles of 1.2 deg - 4.8 deg.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-23; 110-117
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  • 5
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    Development of buried wire gages for measurement of wall shear stress in Blastane experiments (1986)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Buried Wire Gages operated from a Constant Temperature Anemometer System are among the special types of instrumentation to be used in the Boundary Layer Apparatus for Subsonic and Transonic flow Affected by Noise Environment (BLASTANE). These Gages are of a new type and need to be adapted for specific applications. Methods were developed to fabricate Gage inserts and mount those in the BLASTANE Instrumentation Plugs. A large number of Gages were prepared and operated from a Constant Temperature Anemometer System to derive some of the calibration constants for application to fluid-flow wall shear-stress measurements. The final stage of the calibration was defined, but could not be accomplished because of non-availability of a suitable flow simulating apparatus. This report provides a description of the Buried Wire Gage technique, an explanation of the method evolved for making proper Gages and the calibration constants, namely Temperature Coefficient of Resistance and Conduction Loss Factor.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-89212 , NAS 1.15:89212
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  • 6
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    Evaluation of Rockwell HgCdTe arrays for astronomical use (1986)
    In:  CASI
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    Publication Date: 2006-02-14
    Description: The 32 x 32 HgCdTe array manufactured by Rockwell International was proven to be a highly competitive detector type for use at wavelengths shorter than 2.5 microns. The goal of a K=+16 sky survey using this array attached to the Steward Observatory Transit Telescope is clearly within reach. The detector material exhibits high quantum efficiency and low dark currents indicating that its usefulness may extend beyond its use with a CCD readout on groundbased telescopes.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Ames Research Center Proceedings of the Second Infrared Detector Technology Workshop; 14 p
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  • 7
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    Cryogenic tunnel measurement of total temperature and pressure (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: A newly developed, 3-mm-diam, dual hot-wire aspirating probe was used to measure the time-resolved stagnation temperature and pressure in a transonic cryogenic wind tunnel. Measurements were taken in the freestream of the settling chamber and test section. Data were also obtained in the unsteady wake shed from an airfoil oscillating at 5 Hz. The investigation revealed the presence of large fluctuations in the settling chamber occuring at the blade passing frequency of the driving fan of the tunnel. These fluctuations decrease at the test section. The rms value of the fluctuating stagnation pressure decreased from 17.5 percent in the settling chamber to 3.7 percent in the test section. Fluctuating stagnation temperature decreased from 12.3 percent to 8.4 percent. Measurements in the wake of the oscillating airfoil showed a fluctuating stagnation temperature of as much as 42 K in rms value.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Journal of Aircraft (ISSN 0021-8669); 23; 244-249
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  • 8
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    Experimental comparison of two hot-wire techniques in supersonic flow (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA Journal (ISSN 0001-1452); 27; 1074-108
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  • 9
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    Observations by the Halley multicolor camera (1986)
    In:  Other Sources
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    Publication Date: 2013-08-29
    Description: The first image of comet Halley was taken by the multicolor camera (HMC) on 9 March from a distance of 23.6 million km. During the encounter HMC was switched on at 4:12 hr before closest approach CA. It took its first image at 3:06 h before CA. Overall 2043 images were taken in single sensor mode. The inner coma was observed using all 11 filters and polarizers. The transmission curves of the filters (except polarizers) are shown together with the sensitivity of the camera. At 6 min before CA HMC switched to multiple sensor mode taking 4 images almost simultaneously through the clear, blue, and red wideband filters. Only 2% of all data taken could be transmitted in 69 image sets. The last image showing details of the nuclear surface was taken from a slant distance of 1740 km and has a nominal resolution of 39 m per pixel.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: ESA Proceedings of the 20th ESLAB Symposium on the Exploration of Halley's Comet. Volume 2: Dust and Nucleus; p 347-350
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  • 10
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    A fast-response aspirating probe for measurements of total temperature and pressure in transonic cryogenic wind tunnel (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: A newly developed, 3-mm-diam, dual hot-wire aspirating probe was used to measure the time-resolved stagnation temperature and pressure in a transonic cryogenic wind tunnel. The probe consists of two coplanar constant temperature hot wires at different overheat ratios operating in a 1.5-mm-diam channel with a choked exit. Thus, the constant Mach number flow by the wires is influenced only by free-stream stagnation temperature and pressure. Diffusion of the free-stream Mach number to a lower value in the channel reduces the dynamic drag on the hot-wire. Frequency response of the present design is dc to 20 kHz. The probe was used to measure the unsteady wake shed from an oscillating airfoil tested in the 0.3-m Transonic Cryogenic Tunnel at NASA-Langley Research Center. The hot-wire lasted for more than ten hours before breaking, proving the ruggedness of the probe and the usefulness of the technique in a high dynamic pressure, transonic cryogenic wind tunnel. Typical data obtained from the experiment are presented after reduction to stagnation pressure and temperature.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 86-0126
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