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  • 1
    Electronic Resource
    Electronic Resource
    A nonintrusive laser interferometer method for measurement of skin friction (1983)
    Springer
    Experiments in fluids 1 (1983), S. 15-22 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method is described for monitoring the changing thickness of a thin oil film subject to an aerodynamic shear stress using two focused laser beams. The measurement is then simply analyzed in terms of the surface skin friction of the flow. The analysis includes the effects of arbitrarily large pressure and skinfriction gradients, gravity, and time-varying oil temperature. It may also be applied to three-dimensional flows with unknown direction. Applications are presented for a variety of flows including two-dimensional flows, three-dimensional swirling flows, separated flows, supersonic high-Reynolds-number flows, and delta-wing vortical flows.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00282262
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    Paper (German National Licenses)
    Fulltext
  • 2
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    A nonintrusive laser interferometer method for measurement of skin friction (1983)
    Springer
    Details
    Publication Date: 1983-01-01
    Print ISSN: 0723-4864
    Electronic ISSN: 1432-1114
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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    PAPER CURRENT
  • 3
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    Measurements of the duration of constant reflected-shock temperature in a reflected shock tunnel (1971)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Carbon dioxide IR radiation measurements of duration of constant reflected shock temperature in overtailored shock tunnel
    Keywords: FACILITIES, RESEARCH, AND SUPPORT
    Type: ; YAL SOCIETY (
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A laser interferometer for measuring skin friction in three-dimensional flows (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Previously cited in issue 05, p. 643, Accession no. A83-16685
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA Journal (ISSN 0001-1452); 22; 557-559
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Measured time variations of reflectance for carbon dioxide laser beam splitters (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Time variations of reflectance measured for carbon dioxide laser beam splitters
    Keywords: MASERS
    Type: ; 459 (
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Experiments with a CO2 gas-dynamic laser (1970)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Carbon dioxide gas dynamic layer in shock tube facility, measuring shape, time, output energy, beam diameter, etc
    Keywords: MASERS
    Type: ; 459 (
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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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
  • 8
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    A nonintrusive laser interferometer method for measurement of skin friction (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A method is described for monitoring the changing thickness of a thin oil film subject to an aerodynamic shear stress using two focused laser beams. The measurement is then simply analyzed in terms of the surface skin friction of the flow. The analysis includes the effects of arbitrarily large pressure and skin friction gradients, gravity, and time varying oil temperature. It may also be applied to three dimensional flows with unknown direction. Applications are presented for a variety of flows, including two dimensional flows, three dimensional swirling flows, separated flow, supersonic high Reynolds number flows, and delta wing vortical flows. Previously announced in STAR as N83-12393
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Experiments in Fluids (ISSN 0723-4864); 1; 1, 19; 1983
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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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
  • 10
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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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    NASA TECHNICAL REPORTS
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