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  • 1
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    Nanosecond time transfer via shuttle laser ranging experiment (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Keywords: LASERS AND MASERS
    Type: Proc. of the 9th Ann. Precise Time and Time Interval (PTTI) Appl. and Planning Meeting; p 319-342
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Detailed design of a variable volume hydrogen maser (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Identification of the hydrogen maser design parameters include the shape of the bulk, q (quality parameter), tuning factors, materials to be used, and operational temperature to offset the wall shift. Expressions for the statistic error on the measured frequency were derived. Localized variations in the concentration of excited atoms were studied and how the shape of the container (the ratio of surface to volume in particular) affects their behavior.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-175221 , NAS 1.26:175221
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    External bulb variable volume maser (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A maser functioning as a frequency standard stable to one part in 10 to the 14th power includes a variable volume, constant surface area storage bulb having a fixed volume portion located in a resonant cavity from which the frequency standard is derived. A variable volume portion of the bulb, exterior to the resonant cavity, has a maximum volume on the same order of magnitude as the fixed volume bulb portion. The cavity has a length to radius ratio of at least 3:1 so that the operation is attained without the need for a feedback loop. A baffle plate, between the fixed and variable volume bulb portions, includes apertures for enabling hydrogen atoms to pass between the two bulb portions and is an electromagnetic shield that prevents coupling of the electromagnetic field of the cavity into the variable volume bulb portion.
    Keywords: LASERS AND MASERS
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Development of an airborne laser bathymeter (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An airborne laser depth sounding system was built and taken through a complete series of field tests. Two green laser sources were tried: a pulsed neon laser at 540 nm and a frequency-doubled Nd:YAG transmitter at 532 nm. To obtain a depth resolution of better than 20 cm, the pulses had a duration of 5 to 7 nanoseconds and could be fired up to at rates of 50 pulses per second. In the receiver, the signal was detected by a photomultiplier tube connected to a 28 cm diameter Cassegrainian telescope that was aimed vertically downward. Oscilloscopic traces of the signal reflected from the sea surface and the ocean floor could either be recorded by a movie camera on 35 mm film or digitized into 500 discrete channels of information and stored on magnetic tape, from which depth information could be extracted. An aerial color movie camera recorded the geographic footprint while a boat crew of oceanographers measured depth and other relevant water parameters. About two hundred hours of flight time on the NASA C-54 airplane in the area of Chincoteague, Virginia, the Chesapeake Bay, and in Key West, Florida, have yielded information on the actual operating conditions of such a system and helped to optimize the design. One can predict the maximum depth attainable in a mission by measuring the effective attenuation coefficient in flight. This quantity is four times smaller than the usual narrow beam attenuation coefficient. Several square miles of a varied underwater landscape were also mapped.
    Keywords: OCEANOGRAPHY
    Type: NASA-TN-D-8079
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Nanosecond time transfer via shuttle laser ranging experiment (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A method is described to use a proposed shuttle laser ranging experiment to transfer time with nanosecond precision. All that need be added to the original experiment are low cost ground stations and an atomic clock on the shuttle. It is shown that global time transfer can be accomplished with 1 ns precision and transfer up to distances of 2000 km can be accomplished with better than 100 ps precision.
    Keywords: LASERS AND MASERS
    Type: NASA-TM-78073 , NASA/DOD PTTI Meeting; Nov 29, 1977 - Dec 01, 1977; Greenbelt, MD; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Airborne laser bathymeter (1975)
    In:  Other Sources
    Details
    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
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