Accession Number : ADA530808


Title :   Laser Diagnostics for Reacting Flows


Descriptive Note : Final rept. 1 Dec 2006-30 Nov 2009


Corporate Author : STANFORD UNIV CA HIGH TEMPERATURE GASDYNAMICS LAB


Personal Author(s) : Hanson, Ronald K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a530808.pdf


Report Date : 11 Jan 2010


Pagination or Media Count : 84


Abstract : Advanced optical diagnostic techniques relevant to propulsion were investigated. The techniques studied were based on laser spectroscopy, with emphasis on spectrally-resolved absorption and laser-induced fluorescence (LIF). Laser sources included tunable CW near-infrared (NIR) diode lasers and tunable (or fixed-wavelength) pulsed lasers operated at ultraviolet (UV) wavelengths. Accomplishments of note included: (1) development of a new pressure- and temperature-dependent database for tracer-based planar laser induced fluorescence (PLIF) imaging with 3-pentanone, (2) the first demonstration of high-speed PLIF using CW excitation, (3) development and demonstration of new tracer-based PLIF strategies for imaging interactions of high-speed flows with obstacles and boundary layers, (4) the extension of advanced wavelength-multiplexed diode laser sensing to absorption transitions of H2O and CO2 in the extended NIR through use of newly available diode laser sources, (5) extension of diode laser absorption sensing to high-pressure environments, (6) the demonstration of wavelength-multiplexed strategies for quantitative measurements of hydrocarbon fuels in the presence of liquid fuel aerosols and liquid fuel films, and (7) applications of tunable-diode-laser (TDL) absorption sensors in scramjet flows at the AFRL at Wright-Patterson AFB using wavelength-multiplexed lasers and 1f-normalized, wavelength modulation spectroscopy with a 2f detection strategy. The full spectrum of results for the reporting period was published in thirty-six papers in the peer-reviewed literature, five PhD theses, and thirty-two presentations and invited lectures.


Descriptors :   *LASER DIAGNOSTICS , *SUPERSONIC FLOW , SPECTROSCOPY , LASER INDUCED FLUORESCENCE , WATER , HIGH VELOCITY , FREQUENCY MODULATION , BOUNDARY LAYER , HIGH PRESSURE , PULSED LASERS , HYDROCARBONS , ABSORPTION , CARBON DIOXIDE , MULTIPLEXING , SUPERSONIC COMBUSTION RAMJET ENGINES , DIODE LASERS , LASER SPECTROSCOPY , TUNABLE LASERS , OPTICS , DETECTORS


Subject Categories : Lasers and Masers
      Miscellaneous Detection and Detectors
      Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE