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  • 1
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    New algae mapping technique by the use of an airborne laser fluorosensor. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: An airborne laser fluorosensor for the detection of algae in the sea has been developed. The system transmits dye laser radiation at 590 nm and monitors the fluorescent emission at 685 nm from chlorophyll-a bearing microorganisms. The system was successfully flown over the test areas of Lake Ontario and Chesapeake Bay. The device is sensitive to a fraction of mg/cu-M chlorophyll-a density in the water from an altitude of 30 m.
    Keywords: GEOPHYSICS
    Type: Applied Optics; 12; July 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Airborne bathymetric charting using pulsed blue-green lasers (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Laboratory and airborne experiments have proven the feasibility and demonstrated the techniques of an airborne pulsed laser system for rapidly mapping coastal water bathymetry. Water depths of 10 plus or minus 0.25 m were recorded in waters having an effective attenuation coefficient of 0.175 m. A 2-MW peak power Nd:YAG pulsed laser was flown at an altitude of 600 m. An advanced system, incorporating a mirror scanner, a high pulsed rate laser, and a good signal processor, could survey coastal zones at the rate of several square miles per hour.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 16; Jan. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Analysis of the backscatter spectrum in an ionospheric modification experiment (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The purpose of this study is to compare predictions of the backscatter spectrum, including effects of ionospheric inhomogeneity, with experimental observations of incoherent backscatter from an artificially heated region. Our calculations show that the strongest backscatter echo received is not from the reflection level but from a region some distance below (about 900-1100 m for an experiment carried out at Arecibo). By taking the standing wave pattern of the pump properly into account the present theory explains certain asymmetrical features of the upshifted and downshifted plasma lines in the backscatter spectrum.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 81; Jan. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A multichannel photoionization chamber for absorption analysis Patent (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Multichannel photoionization chamber for measuring absorption, photoionization yield, and coefficients of gases
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A kinetic approach for polymer solution data. (1968)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Kinetic approach for polymer solution data
    Keywords: GEOPHYSICS
    Type: NATIONAL MEETING; Feb 19, 1967 - Feb 23, 1967; HOUSTON, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Airborne laser bathymeter (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A description is given of a program concerned with the development and the evaluation of techniques for the measurement of water depth with a pulsed laser. Airborne laser bathymetry makes use of a light pulse which is sent downward. Information concerning the water depth is provided by the time interval observed between the arrival of the light pulse reflected from the water surface and the arrival of the pulse coming from the ocean floor. Details concerning the instrumentation used for the developed measurement method are discussed. Attention is also given to field experiments and aspects of system performance.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Electro-optical Systems Design Conference and International Laser Exposition; Nov 11, 1975 - Nov 13, 1975; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Analysis of the backscatter spectrum in an ionospheric modification experiment (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Predictions of the backscatter spectrum are compared, including effects of ionospheric inhomogeneity with experimental observations of incoherent backscatter from an artificially heated region. Calculations show that the strongest backscatter echo received is not, in fact, from the reflection level, but from a region some distance below (about 0.5 km for an experiment carried out at Arecibo), where the pump wave from a HF transmitter approximately 100 kW) is below the threshold for parametric amplification. By taking the standing wave pattern of the pump into account, asymmetry is explained of the up-shifted and down-shifted plasma lines in the backscatter spectrum, and the several peaks typically observed in the region of the spectrum near the HF transmitter frequency.
    Keywords: GEOPHYSICS
    Type: NASA-CR-133809 , SUIPR-509
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    An airborne laser fluorosensor for the detection of oil on water (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The successful operation of an airborne laser fluorosensor system is reported that makes it possible to detect and map surface oil, either of natural-seepage or spill origin, on large bodies of water. Preliminary results indicate that the sensitivity of the instrument exceeds that of conventional passive remote sensors currently available for oil spill detection.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Joint Conference on Sensing of Environmental Pollutants; Dec 10, 1973 - Dec 12, 1973; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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