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Sunday, May 17, 2020 | History

3 edition of Demonstration of the feasibility of laser induced fluorescence for arc jet flow diagnostics found in the catalog.

Demonstration of the feasibility of laser induced fluorescence for arc jet flow diagnostics

Sivaram Arepalli

Demonstration of the feasibility of laser induced fluorescence for arc jet flow diagnostics

by Sivaram Arepalli

  • 299 Want to read
  • 29 Currently reading

Published by Lockheed Engineering and Sciences Company, Structures and Mechanics Division and Advanced Programs Office, National Aeronautics and Space Administration, Lyndon B. Johnson Space Center in Houston, Tex .
Written in English

    Subjects:
  • Blunt bodies.,
  • Diagnosis.,
  • Free flow.,
  • Jet flow.,
  • Laser induced fluoescence.,
  • Shock layers.

  • Edition Notes

    Statementprepared by Sivaram Arepalli.
    SeriesNASA-CR -- 185595., NASA contractor report -- NASA CR-185595.
    ContributionsLockheed Engineering & Sciences Company., Lyndon B. Johnson Space Center. Advanced Programs Office., Lyndon B. Johnson Space Center. Structures and Mechanics Division.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL16143529M

    A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Demonstration of the feasibility of laser induced fluorescence for arc jet flow diagnostics Technical Report Arepalli, S. Laser Induced Fluorescence (LIF) studies are carried out on nitric oxide and oxygen molecules in the arc jet flows at the NASA Johnson Space Center Reentry Testing Facility.

    A Guide to Laser-Induced Fluorescence Diagnostics in Plasmas T.G.M. Freegarde and G. Hancock Physical and Theoretical Chemistry Laboratory, Oxford University, South Parks Road, Oxford OX1 3QZ, U K. Abstract. A brief guide is presented for the use of laser induced fluorescence (LIF) as a diagnosticCited by: 7. Laser-induced fluorescence diagnostics on ITER will be used for local measurements of helium density (n HeI) and ion temperature (T i) in the divertor chickashacf.com diagnostics is combined with divertor Thomson scattering via common laser injection and signal collection chickashacf.com by: 4.

    Oct 15,  · The basic principle of laser-induced fluorescence and fluorescence spectroscopy is presented to detect organic molecules with high sensitivity. We present various variants of this method: fluorescence correlation spectroscopy, fluorescence polarization spectroscopy, time-resolved fluorescence chickashacf.com: Axel Donges, Reinhard Noll. LASER-INDUCED FLUORESCENCE DIAGNOSTIC SETUP The laser used in this research is a Coherent ring dye laserthatisopticallypumped by an argon ion laser[7]. DCM dye is used with EPH solvent, giving output powers of up to mW at around nm, appropriate for match-ingthe 52 D 3 / 2 to 6 2 P 1 / 2 transition. ABurleighwavemeter.


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Demonstration of the feasibility of laser induced fluorescence for arc jet flow diagnostics by Sivaram Arepalli Download PDF EPUB FB2

Laser Induced Fluorescence (LIF) studies are carried out on nitric oxide and oxygen molecules in the arc jet flows at the NASA Johnson Space Center Reentry Testing Facility. DEMONSTRATION OF THE FEASIBILITY OF LASER INDUCED FLUORESCENCE FOR ARC JET FLOW DIAGNOSTICS ABSTRACT Laser Induced Fluorescence (LIF) studies are carried out on nitric oxide and oxygen molecules in the arc jet flows at the NASA Johnson Space Center Reentry Testing Facility.

Measurements are taken in the free stream and from a blunt body shock layer. Tests. Laser Induced Fluorescence (LIF) studies are carried out on nitric oxide and oxygen molecules in the arc jet flows at the NASA Johnson Space Center Reentry Testing Facility.

Measurements are taken in the free stream and from a blunt body shock chickashacf.com: Sivaram Arepalli. Jun 01,  · Laser Induced Fluorescence (LIF) studies are carried out on copper atoms, nitric oxide and oxygen molecules in the arc jet flows at the NASA Johnson Space Center Reentry Simulation Testing Facility.

Measurements are taken in the free stream and from a blunt body shock layer. Tests are performed under different flow conditions to determine the feasibility and sensitivity of the LIF Cited by: A LIF system for large-scale arc jet flow diagnostics is comprised of a laser laboratory, an optical apparatus in- corporated into the arc jet test chamber, and a data acquisition system for recording LIF and laser pulse energy measurements in the laboratory and arc jet test chamber.

Demonstration of a New Laser Diagnostic Based on Photodissociation Spectroscopy for Imaging Mixture Fraction in a Non-premixed Jet Flame Ihermocouple, and laser induced fluorescence. Abstract. A laser-induced fluorescence (LIF) technique is implemented to measure concentration profiles and mixing performance in two impinging jet geometries.

Experimental results are reported for steady and unsteady (transitional) mixing of initially segregated miscible fluids. Flow structures. Laser-induced fluorescence (LIF) is one of the methods for visualization of mixing and velocity field of supersonic flows.

The method permits almost nonintrusive study of gas flow dynamics in jet engines with a high temporal and spatial chickashacf.com by: 1. This paper reports the demonstration of instantaneous three-dimension (3D) measurements in turbulent flows at repetition rates up to 10 kHz using VLIF (volumetric laser induced fluorescence).

The measurements were performed based on the LIF signal of iodine (I 2) vapor seeded in the chickashacf.com by: 4. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Fig.

1 shows a schematic of the engine and imaging diagnostics setup. The engine specifications and operating conditions are summarised in Table 1. The engine had 83 mm bore and 92 mm stroke for the displacement volume of cm chickashacf.com by: New laser diagnostic laboratories at two other NASA arc jet facilities at Ames and the Johnson Space Center have been developed to support expanded testing and analysis of human-rated thermal.

Demonstration of the feasibility of laser induced fluorescence for arc jet flow diagnostics Author: Sivaram Arepalli ; Lockheed Engineering & Sciences Company.

Laser-Induced Fluorescence (LIF) Fluorescent dyes (molecules) can absorb light at one frequency and subsequently re-emit (fluoresce) light at a different frequency. In experiments, the dyes are excited by laser light whose frequency closely matches the excitation frequency of the dye.

For. May 17,  · Demonstration and characterization of filtered Rayleigh scattering for planar velocity measurements. Development of High-Spectral-Resolution Planar Laser-Induced Fluorescence Imaging Diagnostics for High-Speed Gas Flow. refluorescence filter for non-intrusive flow chickashacf.com by: Dec 16,  · For studying such supersonic jets, optical flow visualization techniques are frequently used.

It is noted that optical techniques such as Schlieren, shadowgraphy, planar laser-induced fluorescence (PLIF), and Planar Mie scattering are often employed in supersonic jet flow visualization studies (Raffel et chickashacf.com by: 4.

An overview of optical diagnostic techniques for low pressure cold plasmas, such as those used in the electronics industry, is presented. Two different aspects of optical emission are considered.

In the first, commonly called actinometry, species concentrations are inferred from line intensities, while in the second, translational energies are inferred from linewidths and chickashacf.com by: Arc jet facilities and TPS testing. •Atmospheric entry aeroheating environments for TPS materials testing - Heat flux, heat load, pressure, shear.

•Nonequilibrium free stream - Highly dissociated –conditions not encountered in flight. - TPS material response can be sensitive to the degree of nonequilibrium. The translational temperature and the flow velocity distributions in high enthalpy flows are deduced with Two-photon Absorption Laser induced fluorescence diagnostics system to atomic oxygen.

Dec 16,  · Laser based flow visualization techniques are indispensable tools for flow visualization in fluid dynamics and combustion diagnostics. Among these, PLIF is very popular because of its capability to give quantitative information about the flow.

This paper reports the acetone tracer-based PLIF imaging of supersonic jet with air and nitrogen as bath chickashacf.com by: 4. A collimated laser beam from a pulsed, tunable UV laser source is directed into the arc jet facility where it crosses the flow axis at a non- normal angle.

A compact telescope images the emitted fluorescence from a small (sub-mm3) volume at the intersec- tion of the flow centerline and the laser beam.Simultaneous Multi-Property Laser Diagnostics using Filtered Rayleigh Scattering.

Jacob George, Tom P. Jenkins and; Consolidated Laser-Induced Fluorescence Diagnostic Systems for the NASA Ames Arc Jet Facilities. Jay H. Grinstead, CFD Simulations for Arc-Jet Panel Testing Capability Development Using Semi-Elliptical Nozzles.

Tahir Gokcen.Absorbtion, transmission and fluorescence of rhodamine 6G HeNe laser nm Absorbtion Transmission Fluorescence Figure 7: Absorbtion, transmission and LIF spectrum of rhodamine 6G. The cuvet was translated perpendicular to the laser-beam.

The spectra at di erent posi-tions can be found in gure 8. 0 Laser induced.