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  • INSTRUMENTATION AND PHOTOGRAPHY  (270)
  • 1980-1984  (270)
  • 1925-1929
  • 11
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    Frequency and time standards based on stored ions (1984)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The method of ion storage provides a basis for excellent time and frequency standards. This is due to the ability to confine ions for long periods of time without the usual perturbations associated with confinement (e.g., wall shifts). In addition, Doppler effects can be greatly suppressed. The use of stored ions for microwave frequency standards and the future possibilities for an optical frequency standard based on stored ions are addressed.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA. Goddard Space Flight Center Proc. of the 16th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 49-58
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 12
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    Impact of Thematic Mapper Sensor Characteristics on Classification Accuracy (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-13
    Description: A three factor (spectral, spatial, and radiometric resolution), two level (TM and MSS) analysis of variance (ANOVA) approach allowed evaluation of the effects of each factor individually and in all possible combinations. Digital classification accuracy was used as the figure of merit. Nine study sites in Washington, D.C. each of approximately 256 x 256 TM pixels, were randomly selected from the full scene for analysis. These results strongly suggest that the quantization level improvements and the addition of new spectral bands in the visible and middle IR regions (both afforded by the TM sensor design) can result in improved capabilities to accurately delineate land cover categories using a per point Gaussian maximum likelihood classifier. On the other hand, results indicate that the increase in spatial resolution to 30m does not significantly enhance classification accuracy. The spatial result points to an inherent limitation of a per point classifier and to the need to improve data analysis techniques to handle high spatial resolution data.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: LANDSAT-4 Sci. Invest. Summ., Including Dec. 1983 Workshop Results, Vol. 2; p 93-97
    Format: text
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    NASA TECHNICAL REPORTS
  • 13
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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
  • 14
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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
  • 15
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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
  • 16
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    Specifying and calibrating instrumentations for wideband electronic power measurements (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The wideband electric power measurement related topics of electronic wattmeter calibration and specification are discussed. Tested calibration techniques are described in detail. Analytical methods used to determine the bandwidth requirements of instrumentation for switching circuit waveforms are presented and illustrated with examples from electric vehicle type applications. Analog multiplier wattmeters, digital wattmeters and calculating digital oscilloscopes are compared. The instrumentation characteristics which are critical to accurate wideband power measurement are described.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-81545 , DOE/NASA/1044-8
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 17
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    Surface reflectance measurements in the UV from an airborne platform. I (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The reflectance of naturally occurring surfaces is measured from a twin engine Cessna 402B aircraft both spectrally (0.29-0.40 micron) with a compact double monochromator and broadband (0.29-1.2 micron) with a UV enhanced photodiode. The measurement system, which is computer controlled and electrically isolated from the aircraft, consists of upward and downward looking hemispheric diffusers, filters, a rotating 90 deg mirror, a focusing lens, and a double monochromator/PMT or the UV photodiode. Measurements are taken at several altitudes enabling the empirical determination of backscatter and attenuation effects on the reflectance. The results are presented for pine forest canopy, green farmland, open ocean, and brown farmland as a function of wavelength and altitude.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 19; July 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 18
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    InSb charge coupled infrared imaging device: The 20 element linear imager (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The design and fabrication of the 8585 InSb charge coupled infrared imaging device (CCIRID) chip are reported. The InSb material characteristics are described along with mask and process modifications. Test results for the 2- and 20-element CCIRID's are discussed, including gate oxide characteristics, charge transfer efficiency, optical mode of operation, and development of the surface potential diagram.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-3235
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 19
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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
  • 20
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    A digital optical torquemeter for high rotational speed applications (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A digital optical torquemeter system designed for applications at high rotational speeds was fabricated and tested for zero stability at speeds up to 20,000 rpm. Data obtained in a spin rig and with simulated inputs demonstrate that the system is capable of measuring torque bar twist to within 0.03 degrees at speeds of 30,000 rpm. The optical system uses fiber optic bundles to transmit light to the torque bar and to silicon avalanche detectors. The system is microcomputer based and provides measurements of average torque and torque as a function of angular shaft position. The torquemeter requires no bearings or other contact between the rotating torque bar and the nonrotating optics, and tolerates movement of the torque bar as large as 1 mm relative to the optics.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-82914 , E-1189 , NAS 1.15:82914
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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