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  • 1975-1979  (7)
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  • 1
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    Potential efficiencies of open- and closed-cycle CO, supersonic, electric-discharge lasers (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Computed open- and closed-cycle system efficiencies (laser power output divided by electrical power input) are presented for a CW carbon monoxide, supersonic, electric-discharge laser. Closed-system results include the compressor power required to overcome stagnation pressure losses due to supersonic heat addition and a supersonic diffuser. The paper shows the effect on the system efficiencies of varying several important parameters. These parameters include: gas mixture, gas temperature, gas total temperature, gas density, total discharge energy loading, discharge efficiency, saturated gain coefficient, optical cavity size and location with respect to the discharge, and supersonic diffuser efficiency. Maximum open-cycle efficiency of 80-90% is predicted; the best closed-cycle result is 60-70%.
    Keywords: LASERS AND MASERS
    Type: AIAA Journal; 14; May 1976
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A pulser-sustainer carbon monoxide electric-discharge supersonic laser (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Operation of a CW CO electric-discharge supersonic laser with a pulser-sustainer discharge is described. High-power operation as well as independent control over electron energy and density are demonstrated. Maximum input power achieved to date is 100 kW. The maximum output power is 6 kW or 10% of the sustainer positive-column power. Much improved performance appears possible.
    Keywords: LASERS AND MASERS
    Type: Applied Physics Letters; 31; Dec. 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Comparison of rigorous and simple vibrational models for the CO2 gasdynamic laser (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The accuracy of a simple vibrational model for computing the gain in a CO2 gasdynamic laser is assessed by comparing results computed from it with results computed from a rigorous vibrational model. The simple model is that of Anderson et al. (1971), in which the vibrational kinetics are modeled by grouping the nonequilibrium vibrational degrees of freedom into two modes, to each of which there corresponds an equation describing vibrational relaxation. The two models agree fairly well in the computed gain at low temperatures, but the simple model predicts too high a gain at the higher temperatures of current interest. The sources of error contributing to the overestimation given by the simple model are determined by examining the simplified relaxation equations.
    Keywords: LASERS AND MASERS
    Type: AIAA Journal; 15; Nov. 197
    Format: text
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  • 4
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    Pulser-sustainer glow discharge operation in static carbon monoxide laser mixtures (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Successful operation of the pulser-sustainer concept is reported in large volume static room temperature CO laser mixes. High voltage pulses and ultraviolet sparks at 33 kHz combined with a separate low voltage sustainer electric field produce spatially uniform plasmas in a 3.0 liter volume. Completely independent control of ne and E/N is demonstrated. The tests are preliminary to testing of the concept in supersonic flow.
    Keywords: PLASMA PHYSICS
    Type: Princeton Univ. Partially Ionized Plasmas, Including the 3rd Symp. on Uranium Plasmas; p 32-36
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Systems efficiency and specific mass estimates for direct and indirect solar-pumped closed-cycle high-energy lasers in space (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Based on expected advances in technology, the maximum system efficiency and minimum specific mass have been calculated for closed-cycle CO and CO2 electric-discharge lasers (EDL's) and a direct solar-pumped laser in space. The efficiency calculations take into account losses from excitation gas heating, ducting frictional and turning losses, and the compressor efficiency. The mass calculations include the power source, radiator, compressor, fluids, ducting, laser channel, optics, and heat exchanger for all of the systems; and in addition the power conditioner for the EDL's and a focusing mirror for the solar-pumped laser. The results show the major component masses in each system, show which is the lightest system, and provide the necessary criteria for solar-pumped lasers to be lighter than the EDL's. Finally, the masses are compared with results from other studies for a closed-cycle CO2 gasdynamic laser (GDL) and the proposed microwave satellite solar power station (SSPS).
    Keywords: LASERS AND MASERS
    Type: Radiation energy conversion in space; Conference; Jan 26, 1978 - Jan 28, 1978; Moffett Field, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Time-dependent local density measurements in unsteady flows (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A laser-induced fluorescence technique for measuring the relative time-dependent density fluctuations in unsteady or turbulent flows is demonstrated. Using a 1.5-W continuous-wave Kr(+) laser, measurements have been obtained in 0.1-mm diameter by 1-mm-long sampling volumes in a Mach 3 flow of N2 seeded with biacetyl vapor. A signal amplitude resolution of 2% was achieved for a detection frequency bandwidth of 10 kHz. The measurement uncertainty was found to be dominated by noise behaving as photon statistical noise. The practical limits of signal-to-noise ratios have been characterized for a wide range of detection frequency bandwidths that encompasses those of interest in supersonic turbulence measurements.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 79-1088 , American Institute of Aeronautics and Astronautics, Thermophysics Conference; Jun 04, 1979 - Jun 06, 1979; Orlando, FL
    Format: text
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  • 7
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    Time-dependent local density measurements in unsteady flows (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A laser-induced fluorescence technique for measuring the relative time-dependent density fluctuations in unsteady or turbulent flows is demonstrated. Using a 1.5-W continuous-wave Kr(+) laser, measurements have been obtained in 0.1-mm-diameter by 1-mm-long sampling volumes in a Mach 3 flow of N2 seeded with biacetyl vapor. A signal amplitude resolution of 2% was achieved for a detection frequency bandwidth of 10 kHz. The measurement uncertainty was found to be dominated by noise behaving as photon statistical noise. The practical limits of signal-to-noise ratios have been characterized for a wide range of detection frequency bandwidths that encompasses those of interest in supersonic turbulence measurements.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-78555 , A-7720
    Format: application/pdf
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