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  • EARTH RESOURCES AND REMOTE SENSING  (3,646)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1,189)
  • 1975-1979  (4,835)
Collection
Keywords
Years
Year
  • 1
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    Real time reflectometer (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A real time reflectometer with the particular utility of measuring fairly rapid (transient) changes in the specular reflectance of a sample which is continuously exposed to a perturbing environment is described. A fixed radiation source, a fixed detector, a uniformly rotating sample wheel, and a uniformly rotating optical wheel protect against misalignment problems. The reflectometer operates by comparing the measurings of a reflected signal with that of a reference signal made within fractions of a second of one another. Reflectance is measured in the infrared, visible, and vacuum ultraviolet regions.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Active remote sensing of layered random media (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Analytical expressions for the backscattering cross sections have been derived for active remote sensing of an arbitrary number of random layers. These results are applicable to the interpretation of radar backscattering from vegetation and snow-ice fields. We illustrate the results by matching experimental data using the model of a three-layer random medium with air above and ground below.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience Electronics; GE-17; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A high-temperature wideband pressure transducer (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Progress in the development of a pressure transducer for measurement of the pressure fluctuations in the high temperature environment of a jet exhaust is reported. A condenser microphone carrier system was adapted to meet the specifications. A theoretical analysis is presented which describes the operation of the condenser microphone in terms of geometry, materials, and other physical properties. The analysis was used as the basis for design of a prototype high temperature microphone. The feasibility of connecting the microphone to a converter over a high temperature cable operating as a half-wavelength transmission line was also examined.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-145710 , PGS-TR-PH-75-16
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Instrumentation for measurement of aircraft noise and sonic boom (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A jet aircraft noise and sonic boom measuring device which converts sound pressure into electric current is described. An electric current proportional to the sound pressure level at a condenser microphone is produced and transmitted over a cable, amplified by a zero drive amplifier and recorded on magnetic tape. The converter is comprised of a local oscillator, a dual-gate field-effect transistor (FET) mixer and a voltage regulator/impedance translator. A carrier voltage that is applied to one of the gates of the FET mixer is generated by the local oscillator. The microphone signal is mixed with the carrier to produce an electrical current at the frequency of vibration of the microphone diaphragm by the FET mixer. The voltage of the local oscillator and mixer stages is regulated, the carrier at the output is eliminated, and a low output impedance at the cable terminals is provided by the voltage regulator/impedance translator.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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    NASA TECHNICAL REPORTS
  • 5
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    Theoretical response of condenser microphones (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Modifications to prior theory yield expressions for the frequency response and equivalent lumped elements of a condenser microphone in terms of its fundamental geometrical and material properties. Results of the analysis show excellent agreement with experimental data taken on B&K pressure microphone types 4134 and 4146.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Acoustical Society of America; vol. 64
    Format: text
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  • 6
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    A high-temperature wideband pressure transducer (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A condenser microphone AM carrier system, which has been developed to measure pressure fluctuations at elevated temperatures, consists of the following components: a condenser microphone designed for operation at elevated temperatures; existing carrier electronics developed under two previous research grants but adapted to meet present requirements; a 6 m cable operating as a half-wavelength transmission line between the microphone and carrier electronics; and a voltage-controlled oscillator used in a feedback loop for automatic tuning control. Both theoretical and practical aspects of the development program are considered. The three predominant effects of temperature changes are changes in the membrane-backplate gap, membrane tension, and air viscosity. The microphone is designed so that changes in gap and membrane tension tend to have compensating effects upon the microphone sensitivity.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-149789 , PGSTR-PH77-48
    Format: application/pdf
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  • 7
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    A high-temperature wideband pressure transducer (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The problem of operating a condenser microphone as a terminal element of a half wavelength transmission line was dealt with; the environment in which the microphone operates necessitates a 25 foot separation from its supporting electronics. A theoretical analysis of the microphone-cable system, substantiated by laboratory tests, provided criteria to optimize system gain.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-CR-146422 , PGSTR-PH76-24
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    California desert resource inventory using multispectral classification of digitally mosaicked Landsat frames (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Procedures for adjustment of brightness values between frames and the digital mosaicking of Landsat frames to standard map projections are developed for providing a continuous data base for multispectral thematic classification. A combination of local terrain variations in the Californian deserts and a global sampling strategy based on transects provided the framework for accurate classification throughout the entire geographic region.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Machine processing of remotely sensed data; Jun 27, 1979 - Jun 29, 1979; West Lafayette, IN
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Integration of Landsat, Seasat, and other geo-data sources (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper discusses integration of Landsat, Seasat, and other geographic information sources. Mosaicking of radar data and registration of radar to Landsat digital imagery are described, and six types of geophysical data, including gravity and magnetic measurements, are integrated and analyzed using image processing techniques.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Symposium on Remote Sensing of Environment; Apr 23, 1979 - Apr 27, 1979; Ann Arbor, MI
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Multiple-frame, full resolution Landsat mosaicking to standard map projections (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Landsat digital data are presently available by frames whose size and location are determined by satellite orbit. The utility of Landsat data was increased by the image processing support for JPL's planetary program which provided the basic software and procedures necessary for image mosaicking. The computer software has been extended to perform this task on Landsat Multi-spectral scanner imagery and a ten frame digital mosaic of the Southern California desert has been completed. Major processing steps include location of geographic points in the digital frame and of common geographic points in adjacent frames, conversion to a map projection, lateral 'rubber sheet' correction of the digital frames, brightness correction of adjacent frames, and mosaicking of the frames to eliminate overlap and produce a single large frame.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Fall Technical Meeting; Oct 15, 1978 - Oct 20, 1978; Albuquerque, NM
    Format: text
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    NASA TECHNICAL REPORTS
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