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  • INSTRUMENTATION AND PHOTOGRAPHY  (60)
  • 2020-2020
  • 1980-1984  (60)
  • 1983  (60)
  • 1
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    Short wavelength infrared hybrid focal plane arrays (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The employment of area focal plane arrays (FPA) has made it possible to obtain second generation infrared imaging systems with high resolution and sensitivity. The Short Wavelength Infrared (SWIR) region (1-2.5 microns) is of importance for imaging objects at high temperature and under conditions of reflected sunlight. The present investigation is concerned with electrooptical characterization results for 32 x 32 SWIR detector arrays and FPAs which are suitable for use in a prototype imaging spectrometer. The employed detector material is Hg(1-x)Cd(x)Te grown by liquid phase epitaxy on a CdTe transparent substrate. Attention is given to details of processing, the design of the detector array, the multiplexer, the fabrication of the hybrid FPA, and aspects of performance.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Technical issues in infrared detectors and arrays; April 5, 6, 1983; Arlington, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Moire deflectometry with deferred analysis (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A simplified version of moire deflectometry for flow visualization is presented. The modification comprises replacement of the second grating, the ground glass screen, and the camera with a plate film holder to obtain a shadow picture. Postanalysis proceeds by placing a grid transparency of the same periodicity of the remaining glass grating on the negative for projection viewing. The rotational angle between the grating and the plate alters the moire fringe periodicity. Use of the method in studying flows is predicted to reveal weak density gradient areas and shocks.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 22; Mar. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Ride quality meter (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A ride quality meter is disclosed that automatically transforms vibration and noise measurements into a single number index of passenger discomfort. The noise measurements are converted into a noise discomfort value. The vibrations are converted into single axis discomfort values which are then converted into a combined axis discomfort value. The combined axis discomfort value is corrected for time duration and then summed with the noise discomfort value to obtain a total discomfort value.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Laser diagnostic methods - A summary (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This is a summary and discussion of the state of the art in the use of laser diagnostics in fluid and plasma dynamics. This will encompass: interferometry, scattering, spectroscopy, and velocimetry. Examples of such applications will be provided in the area of fluid dynamics of particle generation and breakup, analysis of three-dimensional density fields, and applications in combustion.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 83-1683
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Apparatus for continuous, fast, and precise measurements of position and velocity of a small spherical particle (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The position and velocity of optically levitated glass spheres (radii 10-20 microns) movng in a gas are measured accurately, rapidly, and continuously using a high-speed rotating polygon mirror. The experimental technique developed here has repeatable position accuracies better than 20 microns. Each measurement takes less than 1 microsec and can be repeated every 100 microsec. The position of the levitated glass spheres can be manipulated accurately by modulating the laser power with an acoustic optic modulator. The technique provides a fast and accurate method to study general particle dynamics in a fluid.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Review of Scientific Instruments (ISSN 0034-6748); 54; 1643-164
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Remote sensing of sediment and chlorophyll with the test-bed aircraft multispectral scanner (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An instrument known as the test-bed aircraft multispectral scanner (TBAMS) was used in a research flight over the entrance to the Chesapeake Bay. Upwelled radiances from the TBAMS data were correlated with the water parameters, particularly sediment and chlorophyll a. Several algorithms were demonstrated for monitoring sediment and chlorophyll, with a three-band ratio being the best. The primary advantage of the three-band ratio was found to be its apparent insensitivity to atmospheric and Sun-angle variations.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-84590 , L-15572 , NAS 1.15:84590
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Instrumental effects on the temperature and density derived from the light ion mass spectrometer (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An expression for the flux into a retarding potential analyzer (RPA) is derived which takes into account the instrumental effect of a dependence on energy of the solid angle of the acceptance cone. A second instrumental effect of a limited bandpass is briefly discussed. Using the (LIMS) instrument on SCATHA, it is shown that temperatures and densities derived without considering the effect of the solid angle dependence on energy will be too low, dramatically so for E(t) E(1), where E(1) is the e folding distance of the solid angle dependence and E(t) is the thermal energy of the plasma. For E(t) E(1), there is effectively no impact on the derived temperatures and densities if the solid angle effect is ignored.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-82536 , NAS 1.15:82536
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Coherent infrared lidar mission and technology needs for measurements of transport and concentration of tropospheric trace species (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The science justification and the feasibility of aircraft-based CO2 Doppler lidar measurements of transport between the free troposphere and the stratosphere (or planetary boundary layer) are discussed for a wide range of seasonal and geographic conditions. Ground-based coherent CO2 lidar aerosol scattering experiments using a stable ring resonator (about 50 mJ/pulse) CO2 laser with external injection locking are reported. Comparative studies of injection-locked CO2 laser unstable resonators and master oscillator power amplifiers are reported for future CO2 lidar missions with respect to requirements of pulse energy, duration/shape, frequency chirp, efficiency for heterodyne detection, and combined Doppler lidar and Differential Absorption Lidar missions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Coherent infrared radar systems and applications II; April 7, 8, 1983; Arlington, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    A two-pyroxene thermometer (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Experimentally determined pyroxene phase relations at 800-1200 C are combined with calculated phase equilibria for the Di-En and Hd-Fs joins to yield a graphical two-pyroxene thermometer that should be suitable for a wide variety of rocks from the earth, the moon, and meteorites. The thermometer can be used directly with natural pyroxenes having low contents of Al and other minor components. Samples having higher contents of 'other' components require special projection onto the Ca-Mg-Fe pyroxene quadrilateral; Wo, En, and Fs as normally calculated will not yield correct temperatures. The special projection is required to approximate the activities of those components in natural pyroxenes. Whereas the effects of pressure are nonnegligible, they can be corrected for. It is pointed out that use of the thermometer for slowly cooled rocks may pose special problems if the pyroxenes have undergone granule exsolution (coalescence of exsolved material to form separate grains).
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Lunar and Planetary Science Conference; Mar 15, 1982 - Mar 19, 1982; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Nd:YAG holographic interferometer for aerodynamic research (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A holographic interferometer system has been installed in the NASA Ames 2- by 2-Foot Transonic Wind Tunnel. The system incorporates a modern 10 pps, Nd:YAG pulsed laser which provides reliable operation and is easy to align. The spatial filtering requirements of the unstable resonator beam are described, as well as the integration of the system into the existing schlieren system. A two-plate holographic interferometer is used to reconstruct flow field data. For static wind tunnel models, the single exposure holograms are recorded in the usual manner; however, for dynamic models such as oscillating airfoils, synchronous laser hologram recording is used.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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