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  • 1
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    Onset of rotating disturbance in the interelectrode region and exhaust jet of an MPD arc (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Rotating plasma disturbances onset in MPD arc, determining magnetic field dependence on mass flow, background pressure and propellant
    Keywords: PROPULSION SYSTEMS
    Type: AIAA PAPER 69-232 , AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, ELECTRIC PROPULSION CONFERENCE, 7TH; Mar 03, 1969 - Mar 05, 1969; WILLIAMSBURG, VA|; SEARCH(
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  • 2
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    Multiwavelength LIDAR for remote sensing of chlorophyll A in algae and phytoplankton (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-11
    Description: A theoretical and experimental analysis of laser induced fluorescence for remote detection of chlorophyll A in living algae and phytoplankton is presented. The fluorescent properties of various species of algae representative of the different color groups are described. Laboratory measurements of fluorescent scattering cross sections is discussed and quantitive data presented. A scattering matrix model is developed to demonstrate the essential requirement of multiwavelength laser excitation in order to make accurate quantitative measurements of chlorophyll A concentration when more than one color group of algae is present in the water. A practical airborne laser fluorosensor design is considered and analysis of field data discussed. Successful operation of the Langley ALOPE (airborne LIDAR oceanographic probing experiment) system is described and field measurements presented. Accurate knowledge of alpha, the optical attenuation coefficient of the water, is shown to be essential for quantitative analysis of chlorophyll A concentration. The feasibility of remotely measuring alpha by laser radar is discussed.
    Keywords: LASERS AND MASERS
    Type: The Use of Lasers for Hydrographic Studies; p 137-146
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  • 3
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    CARS system for turbulent flame measurements (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Propulsion and Power (ISSN 0748-4658); 1; 205-209
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  • 4
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    Measurements of F2, NO, and ONF Raman cross sections and depolarization ratios for diagnostics in chemical lasers. (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Keywords: MASERS
    Type: Journal of Chemical Physics; 58; Apr. 1
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  • 5
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    Simple technique for sequential Q-switching of molecular lasers. (1972)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: A simple technique for sequentially Q-switching molecular lasers is discussed in which an optical scanner is used as an optical folding element in a laser cavity consisting of a stationary diffraction grating and partially reflecting mirror. Sequential Q-switching of a conventional CO2 laser is demonstrated in which over sixty-two transitions between 9.2 and 10.8 microns are observed. Rapid repetition rates (200 Hz) and narrow laser pulses (less than 5 microsec) allow conventional signal processing techniques to be used with this multiwavelength laser source which is a versatile tool for laser propagation studies, absorption spectroscopy, and gain measurements. Results of a preliminary experiment demonstrating the utility of measuring selective absorption of CO2 laser wavelengths by C2H4 are shown.
    Keywords: MASERS
    Type: Applied Optics; 11; July 197
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  • 6
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    Coherent Anti-Stokes Raman scattering with reflective optics (1983)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Attention is given to the implementation of a novel reflective optics configuration in which the lens normally employed for focusing and crossing the input laser beams in Coherent Anti-Stokes Raman spectroscopy (CARS) is replaced by a spherical mirror, allowing large crossing angles to be obtained with a single focusing device and permitting the laser generation and collection equipment to be located on one side of the sample region. The experimental results obtained demonstrate the feasibility of mirror-based CARS in remote combustion diagnostics.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Applied Optics (ISSN 0003-6935); 22; July 1
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  • 7
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    Intensified silicon photodiode array detector linearity Application to coherent anti-Stokes Raman spectroscopy (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The linearity of an intensified silicon photodiode array multichannel detector is studied with coherent anti-Stokes Raman and other similar signals. Studies with diffuse and focused (spherically and cylindrically) signals resolved apparent saturation problems which limit the dynamic range of the detector. In addition, it has been shown that there is no short-range wavelength (473-532-nm) dependence on this saturation. Theoretical explanations for these phenomena are also included.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 23; 2369-237
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  • 8
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    Finite-rate chemistry effects in a Mach 2 reacting flow (1991)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: UV spontaneous vibrational Raman scattering and laser-induced predissociative fluorescence (LIPF) are combined and applied to a supersonic flame. For the first time, simultaneous measurements of temperature, major species (H2, O2, N2, H2O), and minor species (OH) concentrations are obtained with a 'single' excimer laser in a supersonic-lifted hydrogen-air diffusion flame. In the supersonic flame, a small amount of reaction occurs upstream of the lifted flame base, due to shock wave interactions and mixing with hot vitiated air. The strong turbulent mixing and high total enthalpy fluctuations lead to nonequilibrium values of temperature, and major and minor species concentrations. Combustion occurs farther downstream of the lifted region where slow three-body recombination reactions result in superequilibrium OH concentrations that depress the temperatures below their equilibrium values. Farther downstream, ambient air entrainment contaminates flame properties.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: AIAA PAPER 91-2320
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  • 9
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    Analysis of ALOPE data from Superflux (1981)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Remote sensing data collected with the airborne lidar oceanographic probing experiment (ALOPE) laser fluorosensor during the Superflux 1 and Superflux 2 experiments were analyzed using two techniques. A qualitative technique which requires no supplementary data provided a near-real-time estimate of relative abundance of the golden-brown and green phytoplankton color groups. Contour plots developed for the later mission are used to demonstrate the utility of this technique. A quantitative technique which requires supplementary data to define the attenuation coefficient provides chlorophyll a concentration by color group. The sum of the golden-brown and green chlorophyll a data yields total chlorophyll a values which may be compared with in situ data. As expected, the golden-brown population was dominant in the Chesapeake Bay and the Bay plume whereas the green population was dominant in shelf waters.
    Keywords: OCEANOGRAPHY
    Type: Chesapeake Bay Plume Study; p 405-416
    Format: application/pdf
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  • 10
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    CARS temperature measurements in a hypersonic propulsion test facility (1990)
    In:  Other Sources
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    Publication Date: 2018-12-01
    Description: Static-temperature measurements performed in a reacting vitiated air-hydrogen Mach-2 flow in a duct in Test Cell 2 at NASA LaRC by using a coherent anti-Stokes Raman spectroscopy (CARS) system are discussed. The hypersonic propulsion Test Cell 2 hardware is outlined with emphasis on optical access ports and safety features in the design of the Test Cell. Such design considerations as vibration, noise, contamination from flow field or atmospheric-borne dust, unwanted laser- and electrically-induced combustion, and movement of the sampling volume in the flow are presented. The CARS system is described, and focus is placed on the principle and components of system-to-monochromator signal coupling. Contour plots of scramjet combustor static temperature in a reacting-flow region are presented for three stations, and it is noted that the measurements reveal such features in the flow as maximum temperature near the model wall in the region of the injector footprint.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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